Expressions reference

Expressions can be entered when you see a field with one of these buttons:

The left button indicates a "string expression" (a text)
The right button indicates a "numerical expression" (a number)

This page is a reference of all expressions that can be used in GDevelop, grouped by the extension, object or behavior they belong too. When Object is written, you should enter an object name. Learn more here about how to write expressions

Tip

Expressions are sometime also called functions, like in mathematics.

Objects

Common features that can be used for all objects in GDevelop. Read more explanations about it.

Expression	Description
`PickedInstancesCount()`	Return the number of instances picked by the previous conditions (or actions).
`SceneInstancesCount()`	Return the number of instances of the specified objects living on the scene.

Expression	Description
`Object.Angle()`	Current angle, in degrees, of the object
`Object.AngleToObject()`	Compute the angle between two objects (in degrees). If you need the angle to an arbitrary position, use AngleToPosition.
`Object.AngleToPosition()`	Compute the angle between the object center and a "target" position (in degrees). If you need the angle between two objects, use AngleToObject.
`Object.ArrayVariableFirstNumber()`	Get the value of the first element of an object array variable, if it is a number variable.
`Object.ArrayVariableFirstString()`	Get the value of the first element of an object array variable, if it is a text (string) variable.
`Object.ArrayVariableLastNumber()`	Get the value of the last element of an object array variable, if it is a number variable.
`Object.ArrayVariableLastString()`	Get the value of the last element of an object array variable, if it is a text (string) variable.
`Object.BoundingBoxBottom()`	Return the bounding box (the area encapsulating the object) bottom position.
`Object.BoundingBoxCenterX()`	Return the bounding box (the area encapsulating the object) center X position.
`Object.BoundingBoxCenterY()`	Return the bounding box (the area encapsulating the object) center Y position.
`Object.BoundingBoxLeft()`	Return the bounding box (the area encapsulating the object) left position.
`Object.BoundingBoxRight()`	Return the bounding box (the area encapsulating the object) right position.
`Object.BoundingBoxTop()`	Return the bounding box (the area encapsulating the object) top position.
`Object.CenterX()`	Return the X position of the center of rotation.
`Object.CenterY()`	Return the Y position of the center of rotation.
`Object.Distance()`	Distance between two objects
`Object.DistanceToPosition()`	Distance between an object and a position
`Object.ForceAngle()`	Angle of the sum of forces (in degrees)
`Object.ForceLength()`	Length of the sum of forces
`Object.ForceX()`	X coordinate of the sum of forces
`Object.ForceY()`	Y coordinate of the sum of forces
`Object.Height()`	Height of the object
`Object.Layer()`	Return the name of the layer the object is on
`Object.ObjectName()`	Return the name of the object
`Object.ObjectTimerElapsedTime()`	Value of an object timer
`Object.SqDistance()`	Square distance between two objects
`Object.SqDistanceToPosition()`	Square distance between an object and a position
`Object.Variable()`	Number value of an object variable
`Object.VariableChildCount()`	Number of children in an object array or structure variable
`Object.VariableString()`	Text of an object variable
`Object.Width()`	Width of the object
`Object.X()`	X position of the object
`Object.XFromAngleAndDistance()`	Compute the X position when given an angle and distance relative to the starting object. This is also known as getting the cartesian coordinates of a 2D vector, using its polar coordinates.
`Object.Y()`	Y position of the object
`Object.YFromAngleAndDistance()`	Compute the Y position when given an angle and distance relative to the starting object. This is also known as getting the cartesian coordinates of a 2D vector, using its polar coordinates.
`Object.ZOrder()`	Z-order of an object

Sprite

Animated object which can be used for most elements of a game. Read more explanations about it.

Expression	Description
`Object.AnimationFrameCount()`	Number of frames in the current animation of the object
`Object.PointX()`	X position of a point
`Object.PointY()`	Y position of a point
`Object.Sprite()`	Current frame of the animation of the object

Conversion

Expressions to convert number, texts and quantities. Read more explanations about it.

Expression	Description
`LargeNumberToString()`	Convert the result of the expression to text, without using the scientific notation
`ObjectVarToJSON()`	Convert an object variable to JSON
`ToDeg()`	Converts the angle, expressed in radians, into degrees
`ToJSON()`	Convert a variable to JSON
`ToNumber()`	Convert the text to a number
`ToRad()`	Converts the angle, expressed in degrees, into radians
`ToString()`	Convert the result of the expression to text

Variables

Actions, conditions and expressions to handle variables, from simple variables like the player score, the number of remaining lives to complex variables containing arbitrary data like an inventory or the result of a web request. Read more explanations about it.

Expression	Description
`GlobalVariable()`	Number value of a global variable
`GlobalVariableChildCount()`	Number of children in a global array or structure variable
`GlobalVariableFirstNumber()`	Value of the first element of a global array variable, if it is a number variable
`GlobalVariableFirstString()`	Value of the first element of a global array variable, if it is a text (string) variable.
`GlobalVariableLastNumber()`	Value of the last element of a global array variable, if it is a number variable
`GlobalVariableLastString()`	Value of the last element of a global array variable, if it is a text (string) variable.
`GlobalVariableString()`	Text of a global variable
`SceneVariableFirstNumber()`	Get the value of the first element of a scene array variable, if it is a number.
`SceneVariableFirstString()`	Get the value of the first element of a scene array variable, if it is a text (string).
`SceneVariableLastNumber()`	Get the value of the last element of a scene array variable, if it is a number.
`SceneVariableLastString()`	Get the value of the last element of a scene array variable, if it is a text (string).
`Variable()`	Number value of a scene variable
`VariableChildCount()`	Number of children in a scene array or structure variable
`VariableFirstNumber()`	Get the value of the first element of an array variable, if it is a number.
`VariableFirstString()`	Get the value of the first element of an array variable, if it is a text (string).
`VariableLastNumber()`	Get the value of the last element of an array variable, if it is a number.
`VariableLastString()`	Get the value of the last element of an array variable, if it is a text (string).
`VariableString()`	Text of a scene variable

Mouse and touch

Conditions and actions to handle either the mouse or touches on touchscreen. By default, conditions related to the mouse will also handle the touches - so that it's easier to handle both in your game. You can disable this behavior if you want to handle them separately in different events. Read more explanations about it.

Expression	Description
`CursorX()`	Return the X position of the cursor or of a touch.
`CursorY()`	Return the Y position of the cursor or of a touch.
`MouseWheelDelta()`	Mouse wheel displacement
`StartedTouchOrMouseCount()`	The number of touches (including the mouse) that have just started on this frame. The touch identifiers can be accessed using StartedTouchOrMouseId().
`StartedTouchOrMouseId()`	The identifier of the touch or mouse that has just started on this frame. The number of touches can be accessed using StartedTouchOrMouseCount().
`TouchX()`	Return the X position of a specific touch.
`TouchY()`	Return the Y position of a specific touch.

Keyboard

Allows your game to respond to keyboard input. Note that this does not work with on-screen keyboard on touch devices: use instead conditions related to touch when making a game for mobile/touchscreen devices. Read more explanations about it.

Expression	Description
`LastPressedKey()`	Get the name of the latest key pressed on the keyboard

Scene

Actions and conditions to manipulate the scenes during the game.

Expression	Description
`CurrentSceneName()`	Name of the current scene
`SceneLoadingProgress()`	Return The progress of resources loading in background for a scene (between 0 and 1)..

Timers and time

Actions and conditions to run timers, get the current time or modify the time scale (speed at which the game is running - useful for slow motion effects). Read more explanations about it.

Expression	Description
`Time()`	Current time
`TimeDelta()`	Time elapsed since the last frame rendered on screen
`TimeFromStart()`	Time elapsed since the beginning of the scene
`TimeScale()`	Returns the time scale of the scene.
`TimerElapsedTime()`	Value of a scene timer

Mathematical tools

A set of mathematical functions that can be used in expressions.

Expression	Description
`AngleBetweenPositions()`	Compute the angle between two positions (in degrees).
`AngleDifference()`	Difference between two angles
`DistanceBetweenPositions()`	Compute the distance between two positions.
`Pi()`	The number Pi (3.1415...)
`Random()`	Random integer
`RandomFloat()`	Random float
`RandomFloatInRange()`	Random float in range
`RandomInRange()`	Random integer in range
`RandomWithStep()`	Random value in steps
`XFromAngleAndDistance()`	Compute the X position when given an angle and distance relative to the origin (0;0). This is also known as getting the cartesian coordinates of a 2D vector, using its polar coordinates.
`YFromAngleAndDistance()`	Compute the Y position when given an angle and distance relative to the origin (0;0). This is also known as getting the cartesian coordinates of a 2D vector, using its polar coordinates.
`abs()`	Absolute value
`acos()`	Arccosine, return an angle (in radian). `ToDeg` allows to convert it to degrees.
`acosh()`	Hyperbolic arccosine
`asin()`	Arcsine, return an angle (in radian). `ToDeg` allows to convert it to degrees.
`asinh()`	Arcsine
`atan()`	Arctangent, return an angle (in radian). `ToDeg` allows to convert it to degrees.
`atan2()`	2 argument arctangent (atan2)
`atanh()`	Hyperbolic arctangent
`cbrt()`	Cube root
`ceil()`	Round number up to an integer
`ceilTo()`	Round number up to the Nth decimal place
`clamp()`	Restrict a value to a given range
`cos()`	Cosine of an angle (in radian). If you want to use degrees, use`ToRad`: `sin(ToRad(45))`.
`cosh()`	Hyperbolic cosine
`cot()`	Cotangent of a number
`csc()`	Cosecant of a number
`exp()`	Exponential of a number
`floor()`	Round number down to an integer
`floorTo()`	Round number down to the Nth decimal place
`lerp()`	Linearly interpolate a to b by x
`lerpAngle()`	Linearly interpolates between two angles (in degrees) by taking the shortest direction around the circle.
`log()`	Logarithm
`log10()`	Base-10 logarithm
`log2()`	Base 2 Logarithm
`max()`	Maximum of two numbers
`min()`	Minimum of two numbers
`mod()`	x mod y
`normalize()`	Remap a value between 0 and 1.
`nthroot()`	Nth root of a number
`pow()`	Raise a number to power n
`round()`	Round a number
`roundTo()`	Round a number to the Nth decimal place
`sec()`	Secant
`sign()`	Return the sign of a number (1,-1 or 0)
`sin()`	Sine of an angle (in radian). If you want to use degrees, use`ToRad`: `sin(ToRad(45))`.
`sinh()`	Hyperbolic sine
`sqrt()`	Square root of a number
`tan()`	Tangent of an angle (in radian). If you want to use degrees, use`ToRad`: `tan(ToRad(45))`.
`tanh()`	Hyperbolic tangent
`trunc()`	Truncate a number

Layers and cameras

Each scene can be composed of multiple layers. These conditions and actions allow to manipulate them during the game. In particular, you can move the camera of a layer to center it on an object or a position. Read more explanations about it.

Expression	Description
`CameraAngle()`	Return the angle of rotation of a camera (in degrees).
`CameraBorderBottom()`	Return the position of the bottom border of a camera.
`CameraBorderLeft()`	Return the position of the left border of a camera.
`CameraBorderRight()`	Return the position of the right border of a camera.
`CameraBorderTop()`	Return the position of the top border of a camera.
`CameraCenterX()`	Return the X position of the center of a camera.
`CameraCenterY()`	Return the Y position of the center of a camera.
`CameraHeight()`	Return the height of a camera of a layer.
`CameraWidth()`	Return the width of a camera of a layer.
`CameraZoom()`	Zoom of a camera of a layer
`LayerDefaultZOrder()`	Default Z Order for a layer
`LayerTimeScale()`	Returns the time scale of the specified layer.

Sounds and music

GDevelop provides several conditions and actions to play audio files. They can be either long music or short sound effects. Read more explanations about it.

Expression	Description
`GlobalVolume()`	Global volume value
`MusicChannelPitch()`	Music's pitch
`MusicChannelPlayingOffset()`	Music playing offset
`MusicChannelVolume()`	Music volume
`SoundChannelPitch()`	Sound's pitch
`SoundChannelPlayingOffset()`	Sound playing offset
`SoundChannelVolume()`	Sound volume

Game window and resolution

Provides actions and conditions to manipulate the game window. Depending on the platform on which the game is running, not all of these features can be applied. Read more explanations about it.

Expression	Description
`SceneWindowHeight()`	Height of the scene window (or scene canvas for HTML5 games)
`SceneWindowWidth()`	Width of the scene window (or scene canvas for HTML5 games)
`ScreenHeight()`	Height of the screen (or the page for HTML5 games in browser)
`ScreenWidth()`	Width of the screen (or the page for HTML5 games in browser)
`WindowTitle()`	Window's title

Text manipulation

Provides expressions to manipulate strings (also called texts).

Expression	Description
`FromCodePoint()`	Get character from code point
`NewLine()`	Insert a new line
`StrAt()`	Get a character from a text
`StrFind()`	Search in a text (return the position of the result or -1 if not found)
`StrFindFrom()`	Search in a text, starting from a position (return the position of the result or -1 if not found)
`StrFindLast()`	Search the last occurrence in a string (return the position of the result, from the beginning of the string, or -1 if not found)
`StrFindLastFrom()`	Search in a text the last occurrence, starting from a position (return the position of the result, from the beginning of the string, or -1 if not found)
`StrLength()`	Length of a text
`StrRepeat()`	Repeat a text
`SubStr()`	Get a portion of a text
`ToLowerCase()`	Lowercase a text
`ToUpperCase()`	Uppercase a text

Animatable capability

Animate objects. Read more explanations about it.

Expression	Description
`Object.Animation::Duration()`	Return the current animation duration (in seconds).
`Object.Animation::ElapsedTime()`	Return the elapsed time from the beginning of the animation (in seconds).
`Object.Animation::Index()`	Return the animation played by the object using the animation number (from the animations list).
`Object.Animation::Name()`	Return the animation played by the object using the name of the animation.
`Object.Animation::SpeedScale()`	Return the animation speed scale (1 = the default speed, >1 = faster and <1 = slower).

Effect capability

Apply visual effects to objects. Read more explanations about it.

No expressions for this behavior.

Flippable capability

Flip objects. Read more explanations about it.

No expressions for this behavior.

Resizable capability

Change the object dimensions. Read more explanations about it.

No expressions for this behavior.

Scalable capability

Change the object scale. Read more explanations about it.

Expression	Description
`Object.Scale::Value()`	Return the scale of the object (default scale is 1).
`Object.Scale::X()`	Return the scale on X axis of the object (default scale is 1).
`Object.Scale::Y()`	Return the scale on Y axis of the object (default scale is 1).

Opacity capability

Change the object opacity. Read more explanations about it.

Expression	Description
`Object.Opacity::Value()`	Return the opacity of an object, between 0 (fully transparent) to 255 (opaque).

Text capability

Access objects text. Read more explanations about it.

Expression	Description
`Object.Text::Value()`	Return the text.

Platform (from extension Platform behavior)

Flag objects as being platforms which characters can run on. Read more explanations about it.

No expressions for this behavior.

Platformer character (from extension Platform behavior)

Jump and run on platforms. Read more explanations about it.

Expression	Description
`Object.PlatformerObject::Acceleration()`	Return the horizontal acceleration of the object (in pixels per second per second).
`Object.PlatformerObject::CurrentFallSpeed()`	Return the current fall speed of the object (in pixels per second). Its value is always positive.
`Object.PlatformerObject::CurrentJumpSpeed()`	Return the current jump speed of the object (in pixels per second). Its value is always positive.
`Object.PlatformerObject::CurrentSpeed()`	Return the current horizontal speed of the object (in pixels per second). The object moves to the left with negative values and to the right with positive ones
`Object.PlatformerObject::Deceleration()`	Return the horizontal deceleration of the object (in pixels per second per second).
`Object.PlatformerObject::Gravity()`	Return the gravity applied on the object (in pixels per second per second).
`Object.PlatformerObject::JumpSpeed()`	Return the jump speed of the object (in pixels per second). Its value is always positive.
`Object.PlatformerObject::JumpSustainTime()`	Return the jump sustain time of the object (in seconds).This is the time during which keeping the jump button held allow the initial jump speed to be maintained.
`Object.PlatformerObject::LadderClimbingSpeed()`	Return the ladder climbing speed of the object (in pixels per second).
`Object.PlatformerObject::MaxFallingSpeed()`	Return the maximum falling speed of the object (in pixels per second).
`Object.PlatformerObject::MaxSpeed()`	Return the maximum horizontal speed of the object (in pixels per second).

Destroy when outside of the screen (from extension Destroy Outside Screen Behavior)

Destroy objects automatically when they go outside of the screen's borders. Read more explanations about it.

No expressions for this behavior.

Tiled Sprite (from extension Tiled Sprite Object)

Displays an image repeated over an area. Read more explanations about it.

Expression	Description
`Object.XOffset()`	Return the offset used on the X axis when displaying the image.
`Object.YOffset()`	Return the offset used on the Y axis when displaying the image.

Draggable object (from extension Draggable Behavior)

Move objects by holding a mouse button (or touch). Read more explanations about it.

No expressions for this behavior.

Top-down movement (4 or 8 directions) (from extension Top-down movement)

Move objects left, up, right, and down (and, optionally, diagonally). Read more explanations about it.

Expression	Description
`Object.TopDownMovement::Acceleration()`	Acceleration of the object
`Object.TopDownMovement::Angle()`	Angle, in degrees, of the movement
`Object.TopDownMovement::AngleOffset()`	Rotation offset applied to the object
`Object.TopDownMovement::AngularMaxSpeed()`	Angular maximum speed of the object
`Object.TopDownMovement::Deceleration()`	Deceleration of the object
`Object.TopDownMovement::MaxSpeed()`	Maximum speed of the object
`Object.TopDownMovement::MovementAngleOffset()`	Return the movement angle offset.
`Object.TopDownMovement::Speed()`	Speed of the object
`Object.TopDownMovement::StickAngle()`	Return the angle of the simulated stick input (in degrees)
`Object.TopDownMovement::XVelocity()`	Speed on the X axis of the movement
`Object.TopDownMovement::YVelocity()`	Speed on the Y axis of the movement

Text (from extension Text object)

Displays a text on the screen. Read more explanations about it.

Expression	Description
`Object.FontSize()`	Return the font size of a text object.
`Object.OutlineThickness()`	Return the outline thickness of the text.
`Object.Padding()`	Padding
`Object.ShadowAngle()`	Return the shadow angle of the text.
`Object.ShadowBlurRadius()`	Return the shadow blur radius of the text.
`Object.ShadowDistance()`	Return the shadow distance of the text.
`Object.ShadowOpacity()`	Return the shadow opacity of the text.

Particles emitter (from extension Particle system)

Displays a large number of small particles to create visual effects. Read more explanations about it.

Expression	Description
`Object.ConeSprayAngle()`	Angle of the spray cone
`Object.CurrentParticleCount()`	Number of particles currently displayed.
`Object.EmitterAngle()`	Emission angle of the particles.
`Object.EmitterForceMax()`	The maximal emission force of the particles.
`Object.EmitterForceMin()`	The minimal emission force of the particles.
`Object.Flow()`	Flow of the particles (particles/second).
`Object.MaxParticlesCount()`	Return the maximum number of displayed particles.
`Object.ParticleAlpha1()`	Start opacity of the particles.
`Object.ParticleAlpha2()`	End opacity of the particles.
`Object.ParticleBlue1()`	The start color blue component of the particles.
`Object.ParticleBlue2()`	The end color blue component of the particles.
`Object.ParticleGravityAngle()`	Angle of gravity.
`Object.ParticleGravityLength()`	Value of gravity.
`Object.ParticleGravityX()`	Gravity of particles applied on X-axis.
`Object.ParticleGravityY()`	Gravity of particles applied on Y-axis.
`Object.ParticleGreen1()`	The start color green component of the particles.
`Object.ParticleGreen2()`	The end color green component of the particles.
`Object.ParticleLifeTimeMax()`	Maximum lifetime of the particles.
`Object.ParticleLifeTimeMin()`	Minimum lifetime of the particles.
`Object.ParticleRed1()`	The start color red component of the particles.
`Object.ParticleRed2()`	The end color red component of the particles.
`Object.ParticleRotationMaxSpeed()`	Return the maximum rotation speed of the particles.
`Object.ParticleRotationMinSpeed()`	Return the minimum rotation speed of the particles.
`Object.ParticleSize1()`	Start size of particles.
`Object.ParticleSize2()`	End size of particles.
`Object.RendererParam1()`	Rendering first parameter
`Object.RendererParam2()`	Rendering second parameter
`Object.Tank()`	Capacity of the particle tank.
`Object.Texture()`	Name of the image displayed by particles.
`Object.ZoneRadius()`	The radius of the emission zone.

Panel Sprite ("9-patch") (from extension Panel Sprite (9-patch) Object)

An image with edges and corners that are stretched separately from the full image. Read more explanations about it.

No expressions for this object.

Anchor

Anchor objects to the window's bounds. Read more explanations about it.

No expressions for this behavior.

Shape painter

Allows you to draw simple shapes on the screen using the events. Read more explanations about it.

Expression	Description
`Object.Antialiasing()`	Returns the type of anti-aliasing in use: none, low, medium, or high.
`Object.FillColorBlue()`	Filing color blue component
`Object.FillColorGreen()`	Filing color green component
`Object.FillColorRed()`	Filing color red component
`Object.FillOpacity()`	Filling opacity
`Object.OutlineColorBlue()`	Outline color blue component
`Object.OutlineColorGreen()`	Outline color green component
`Object.OutlineColorRed()`	Outline color red component
`Object.OutlineOpacity()`	Outline opacity
`Object.OutlineSize()`	Outline size
`Object.ToDrawingX()`	X drawing coordinate of a point from the scene
`Object.ToDrawingY()`	Y drawing coordinate of a point from the scene
`Object.ToSceneX()`	X scene coordinate of a point from the drawing
`Object.ToSceneY()`	Y scene coordinate of a point from the drawing

Text entry (from extension Text entry object)

Invisible object used to get the text entered with the keyboard. Read more explanations about it.

Expression	Description
`Object.String()`	Text entered with keyboard

Inventories

Provides actions and conditions to add an inventory to your game, with items in memory. Read more explanations about it.

Expression	Description
`Inventory::Count()`	Get the number of an item in the inventory
`Inventory::Maximum()`	Get the maximum of an item in the inventory, or 0 if it is unlimited

Pathfinding (from extension Pathfinding behavior)

Move objects to a target while avoiding all objects that are flagged as obstacles. Read more explanations about it.

Expression	Description
`Object.Pathfinding::Acceleration()`	Acceleration of the object on the path
`Object.Pathfinding::AngleOffset()`	Rotation offset applied the object on the path
`Object.Pathfinding::AngularMaxSpeed()`	Angular maximum speed of the object on the path
`Object.Pathfinding::CellHeight()`	Height of the virtual grid
`Object.Pathfinding::CellWidth()`	Width of the virtual grid
`Object.Pathfinding::DestinationX()`	Destination X position
`Object.Pathfinding::DestinationY()`	Destination Y position
`Object.Pathfinding::ExtraBorder()`	Extra border applied the object on the path
`Object.Pathfinding::GetNodeX()`	Get next waypoint X position
`Object.Pathfinding::GetNodeY()`	Get next waypoint Y position
`Object.Pathfinding::GridOffsetX()`	Return X offset of the virtual grid.
`Object.Pathfinding::GridOffsetY()`	Return Y offset of the virtual grid.
`Object.Pathfinding::LastNodeX()`	Last waypoint X position
`Object.Pathfinding::LastNodeY()`	Last waypoint Y position
`Object.Pathfinding::MaxSpeed()`	Maximum speed of the object on the path
`Object.Pathfinding::MovementAngle()`	Angle of movement on its path
`Object.Pathfinding::NextNodeIndex()`	Get the index of the next waypoint to reach
`Object.Pathfinding::NextNodeX()`	Get next waypoint X position
`Object.Pathfinding::NextNodeY()`	Get next waypoint Y position
`Object.Pathfinding::NodeCount()`	Get the number of waypoints on the path
`Object.Pathfinding::Speed()`	Speed of the object on the path

Obstacle for pathfinding (from extension Pathfinding behavior)

Flag objects as being obstacles for pathfinding. Read more explanations about it.

Expression	Description
`Object.PathfindingObstacle::Cost()`	Obstacle cost

Physics Engine (from extension Physics Engine (deprecated))

Make objects move as if they are subject to the laws of physics. If you're creating a new game, prefer Physics Engine 2.0 Read more explanations about it.

Expression	Description
`Object.Physics::AngularDamping()`	Angular damping
`Object.Physics::AngularVelocity()`	Angular speed
`Object.Physics::LinearDamping()`	Linear damping
`Object.Physics::LinearVelocity()`	Linear speed
`Object.Physics::LinearVelocityX()`	X component
`Object.Physics::LinearVelocityY()`	Y component
`Object.Physics::PolygonScaleX()`	Collision polygon X scale
`Object.Physics::PolygonScaleY()`	Collision polygon Y scale

3D

Support for 3D in GDevelop.

Expression	Description
`Scene3D::CameraFarPlane()`	Return the camera far plane distance.
`Scene3D::CameraFov()`	Return the camera field of view.
`Scene3D::CameraNearPlane()`	Return the camera near plane distance.
`Scene3D::CameraRotationX()`	Return the camera rotation on X axis.
`Scene3D::CameraRotationY()`	Return the camera rotation on Y axis.
`Scene3D::CameraZ()`	Return the camera position on Z axis.

3D Box (from extension 3D)

A box with images for each face

No expressions for this object.

3D Model (from extension 3D)

An animated 3D model.

No expressions for this object.

3D capability (from extension 3D)

Move the object in 3D space.

Expression	Description
`Object.Object3D::CenterZ()`	Return the Z position of the center of rotation.
`Object.Object3D::Depth()`	Return the depth (size on Z axis).
`Object.Object3D::RotationX()`	Return the rotation on X axis.
`Object.Object3D::RotationY()`	Return the rotation on Y axis.
`Object.Object3D::ScaleZ()`	Return the scale on Z axis of an object (default scale is 1).
`Object.Object3D::Z()`	Return the Z position (the "elevation").

Advanced window management

Provides advanced features related to the game window positioning and interaction with the operating system.

Expression	Description
`AdvancedWindow::WindowOpacity()`	Returns the current window opacity (a number from 0 to 1, 1 being fully opaque).
`AdvancedWindow::WindowX()`	Returns the current window X position.
`AdvancedWindow::WindowY()`	Returns the current window Y position.

BBText (from extension BBCode Text Object)

Displays a rich text label using BBCode markup (allowing to set parts of the text as bold, italic, use different colors and shadows). Read more explanations about it.

Expression	Description
`Object.GetAlignment()`	Get the text alignment
`Object.GetBBText()`	Get BBCode text
`Object.GetFontFamily()`	Get the base font family
`Object.GetFontSize()`	Get the base font size
`Object.GetWrappingWidth()`	Get the wrapping width

Bitmap Text

Displays a text using a "Bitmap Font" (an image representing characters). This is more performant than a traditional Text object and it allows for complete control on the characters aesthetic. Read more explanations about it.

Expression	Description
`Object.Alignment()`	Return the text alignment.
`Object.FontName()`	Return the font name (defined in the Bitmap font).
`Object.FontSize()`	Return the font size, defined in the Bitmap Font.
`Object.Text()`	Return the text.
`Object.WrappingWidth()`	Return the width, in pixels, after which the text is wrapped on next line.

Device sensors

Allow the game to access the sensors of a mobile device. Read more explanations about it.

Expression	Description
`DeviceSensors::AccelerationX()`	Get the devices acceleration on the X-axis (m/s²)
`DeviceSensors::AccelerationY()`	Get the devices acceleration on the Y-axis (m/s²)
`DeviceSensors::AccelerationZ()`	Get the devices acceleration on the Z-axis (m/s²)
`DeviceSensors::OrientationAbsolute()`	Get if the devices orientation is absolute and not relative
`DeviceSensors::OrientationAlpha()`	Get the devices orientation Alpha (compass)
`DeviceSensors::OrientationBeta()`	Get the devices orientation Beta
`DeviceSensors::OrientationGamma()`	Get the devices orientation Gamma value
`DeviceSensors::RotationAlpha()`	Get the devices rotation Alpha
`DeviceSensors::RotationBeta()`	Get the devices rotation Beta
`DeviceSensors::RotationGamma()`	Get the devices rotation Gamma

Dialogue Tree

Handle dialogue trees, made using Yarn Spinner. Useful to make complex dialogues with multiple choices. The Yarn Spinner editor is embedded in GDevelop so you can edit your dialogues without leaving GDevelop. Read more explanations about it.

Expression	Description
`DialogueTree::BranchTag()`	Get a tag of the current branch of the running dialogue via its index
`DialogueTree::BranchTags()`	Get the tags of the current branch of the running dialogue
`DialogueTree::BranchText()`	Get the full raw text of the current branch
`DialogueTree::BranchTitle()`	Get the title of the current branch of the running dialogue
`DialogueTree::ClippedLineText()`	Get dialogue line text clipped by the typewriter effect. Use the "Scroll clipped text" action to control the typewriter effect.
`DialogueTree::CommandParameter()`	Get the parameters of a command call - <>
`DialogueTree::CommandParametersCount()`	Get the number of parameters in the currently passed command
`DialogueTree::HorizontalOptionsList()`	Get the text of all available options from an options line type as a horizontal list. You can also pass the selected option's cursor string, which by default is ->
`DialogueTree::LineText()`	Returns the current dialogue line text
`DialogueTree::Option()`	Get the text of an option from an options line type, using the option's Number. The numbers start from 0.
`DialogueTree::OptionsCount()`	Get the number of options in an options line type
`DialogueTree::SelectedOptionIndex()`	Get the number of the currently selected option. Use this to help you render the option selection marker at the right place.
`DialogueTree::TagParameter()`	Get parameter from a Tag found by the branch contains tag condition
`DialogueTree::Variable()`	Get the number stored in a dialogue state variable
`DialogueTree::VariableString()`	Get the string stored in a dialogue state variable
`DialogueTree::VerticalOptionsList()`	Get the text of all available options from an options line type as a vertical list. You can also pass the selected option's cursor string, which by default is ->
`DialogueTree::VisitedBranchTitles()`	Get a list of all visited branches

Facebook Instant Games

Allow your game to send scores and interact with the Facebook Instant Games platform. Read more explanations about it.

Expression	Description
`FacebookInstantGames::PlayerId()`	Get the player unique identifier
`FacebookInstantGames::PlayerName()`	Get the player name

File system

Access the filesystem of the operating system. Read more explanations about it.

Expression	Description
`FileSystem::DesktopPath()`	Get the path to the desktop folder.
`FileSystem::DirectoryName()`	Returns the portion of the path that represents the directories, without the ending file name.
`FileSystem::DocumentsPath()`	Get the path to the documents folder.
`FileSystem::ExecutableFolderPath()`	Get the path to this game executable folder.
`FileSystem::ExecutablePath()`	Get the path to this game executable file.
`FileSystem::ExtensionName()`	Returns the extension of the file designated by the given path, including the extension period. For example: ".txt".
`FileSystem::FileName()`	Returns the name of the file with its extension, if any.
`FileSystem::PathDelimiter()`	Get the operating system path delimiter.
`FileSystem::PicturesPath()`	Get the path to the pictures folder.
`FileSystem::TempPath()`	Get the path to temp folder.
`FileSystem::UserHomePath()`	Get the path to the user home folder.
`FileSystem::UserdataPath()`	Get the path to userdata folder (for application settings).

Firebase

Use Google Firebase services (database, functions, storage...) in your game. Read more explanations about it.

Expression	Description
`Firebase::GetAccountCreationTime()`	Return the accounts creation time.
`Firebase::GetAuthToken()`	Get the user authentication token. The token is the proof of authentication.
`Firebase::GetLastLoginTime()`	Return the user last login time.
`Firebase::GetPhoneNumber()`	Return the user phone number.
`Firebase::GetPhotoURL()`	Gets an URL to the user profile picture.
`Firebase::GetRefreshToken()`	Return the user refresh token. For advanced usage only.
`Firebase::GetRemoteConfigNumber()`	Get a setting from Firebase Remote Config as Number.
`Firebase::GetRemoteConfigString()`	Get a setting from Firebase Remote Config as a string.
`Firebase::GetTenantID()`	Return the user tenant ID. For advanced usage only.
`Firebase::GetUserDisplayName()`	Return the user display name.
`Firebase::GetUserEmail()`	Return the user email address.
`Firebase::GetUserUID()`	Return the user Unique IDentifier. Use that to link data to an user instead of the name or email.
`Firebase::ServerTimestamp()`	Set a field to the timestamp on the server when the request arrives there

Leaderboards

Allow your game to send scores to your leaderboards. Read more explanations about it.

Expression	Description
`Leaderboards::FormatPlayerName()`	Formats a name so that it can be submitted to a leaderboard.
`Leaderboards::LastSaveError()`	Get the error of the last save attempt.

Light (from extension Lights)

Displays a light on the scene, with a customizable radius and color. Add then the Light Obstacle behavior to the objects that must act as obstacle to the lights.

No expressions for this object.

Light Obstacle Behavior (from extension Lights)

Flag objects as being obstacles to light. The light emitted by light objects will be stopped by the object.

No expressions for this behavior.

Multiplayer

Allow players to connect to lobbies and play together. Read more explanations about it.

Expression	Description
`Multiplayer::CurrentPlayerNumber()`	Return the current player number in the lobby (1, 2, ...).
`Multiplayer::CurrentPlayerPing()`	Get the ping of the current player in the lobby.
`Multiplayer::CurrentPlayerUsername()`	Get the username of the current player in the lobby.
`Multiplayer::LastJoinedPlayerNumber()`	Returns the player number of the player that has just joined the lobby.
`Multiplayer::LastLeftPlayerNumber()`	Returns the player number of the player that has just left the lobby.
`Multiplayer::MessageData()`	Returns the data received when the specified message was received from another player.
`Multiplayer::MessageSender()`	Returns the player number of the sender of the specified message.
`Multiplayer::ObjectsSynchronizationRate()`	Return objects synchronization rate (between 1 and 60, default is 30 times per second).
`Multiplayer::PlayerPing()`	Get the ping of the player in the lobby.
`Multiplayer::PlayerUsername()`	Get the username of the player in the lobby.
`Multiplayer::PlayerVariableOwnership()`	Return the player owning the variable.
`Multiplayer::PlayersInLobbyCount()`	Return the number of players in the lobby.

Multiplayer object (from extension Multiplayer)

Allow the object to be synchronized with other players in the lobby. Read more explanations about it.

Expression	Description
`Object.MultiplayerObject::PlayerObjectOwnership()`	Return the player owning the object.

P2P

Allow game instances to communicate remotely using messages sent via WebRTC (P2P). Read more explanations about it.

Expression	Description
`P2P::GetEventData()`	Returns the data received when the specified event was last triggered
`P2P::GetEventSender()`	Returns the id of the peer that triggered the event
`P2P::GetID()`	Gets the client ID of the current game instance
`P2P::GetLastConnectedPeer()`	Gets the ID of the newly connected peer.
`P2P::GetLastDisconnectedPeer()`	Gets the ID of the latest peer that has disconnected.
`P2P::GetLastError()`	Gets the description of the last P2P error

Physics Engine 2.0

Simulate realistic object physics with gravity, forces, joints, etc. Read more explanations about it.

Expression	Description
`Object.Physics2::AngularDamping()`	Get the angular damping of an object.
`Object.Physics2::AngularVelocity()`	Get the angular velocity of an object.
`Object.Physics2::Density()`	Get the density of an object.
`Object.Physics2::DistanceJointDampingRatio()`	Distance joint damping ratio
`Object.Physics2::DistanceJointFrequency()`	Distance joint frequency
`Object.Physics2::DistanceJointLength()`	Distance joint length
`Object.Physics2::Friction()`	Get the friction of an object.
`Object.Physics2::FrictionJointMaxForce()`	Friction joint maximum force
`Object.Physics2::FrictionJointMaxTorque()`	Friction joint maximum torque
`Object.Physics2::GearJointFirstJoint()`	Gear joint first joint
`Object.Physics2::GearJointRatio()`	Gear joint ratio
`Object.Physics2::GearJointSecondJoint()`	Gear joint second joint
`Object.Physics2::GravityScale()`	Get the gravity scale of an object.
`Object.Physics2::GravityX()`	World gravity on X axis
`Object.Physics2::GravityY()`	World gravity on Y axis
`Object.Physics2::Inertia()`	Return the rotational inertia of the object (in kilograms · meters²)
`Object.Physics2::JointFirstAnchorX()`	Joint first anchor X
`Object.Physics2::JointFirstAnchorY()`	Joint first anchor Y
`Object.Physics2::JointReactionForce()`	Joint reaction force
`Object.Physics2::JointReactionTorque()`	Joint reaction torque
`Object.Physics2::JointSecondAnchorX()`	Joint second anchor X
`Object.Physics2::JointSecondAnchorY()`	Joint second anchor Y
`Object.Physics2::LinearDamping()`	Get the linear damping of an object.
`Object.Physics2::LinearVelocity()`	Get the linear velocity of an object.
`Object.Physics2::LinearVelocityAngle()`	Get the linear velocity angle of an object.
`Object.Physics2::LinearVelocityX()`	Get the linear velocity of an object on X axis.
`Object.Physics2::LinearVelocityY()`	Get the linear velocity of an object on Y axis.
`Object.Physics2::Mass()`	Return the mass of the object (in kilograms)
`Object.Physics2::MassCenterX()`	Mass center X
`Object.Physics2::MassCenterY()`	Mass center Y
`Object.Physics2::MotorJointAngularOffset()`	Motor joint angular offset
`Object.Physics2::MotorJointCorrectionFactor()`	Motor joint correction factor
`Object.Physics2::MotorJointMaxForce()`	Motor joint maximum force
`Object.Physics2::MotorJointMaxTorque()`	Motor joint maximum torque
`Object.Physics2::MotorJointOffsetX()`	Motor joint offset X
`Object.Physics2::MotorJointOffsetY()`	Motor joint offset Y
`Object.Physics2::MouseJointDampingRatio()`	Mouse joint damping ratio
`Object.Physics2::MouseJointFrequency()`	Mouse joint frequency
`Object.Physics2::MouseJointMaxForce()`	Mouse joint maximum force
`Object.Physics2::MouseJointTargetX()`	Mouse joint target X
`Object.Physics2::MouseJointTargetY()`	Mouse joint target Y
`Object.Physics2::PrismaticJointAxisAngle()`	Prismatic joint axis angle
`Object.Physics2::PrismaticJointMaxMotorForce()`	Prismatic joint maximum motor force
`Object.Physics2::PrismaticJointMaxTranslation()`	Prismatic joint maximum translation
`Object.Physics2::PrismaticJointMinTranslation()`	Prismatic joint minimum translation
`Object.Physics2::PrismaticJointMotorForce()`	Prismatic joint motor force
`Object.Physics2::PrismaticJointMotorSpeed()`	Prismatic joint motor speed
`Object.Physics2::PrismaticJointReferenceAngle()`	Prismatic joint reference angle
`Object.Physics2::PrismaticJointSpeed()`	Prismatic joint speed
`Object.Physics2::PrismaticJointTranslation()`	Prismatic joint current translation
`Object.Physics2::PulleyJointFirstGroundAnchorX()`	Pulley joint first ground anchor X
`Object.Physics2::PulleyJointFirstGroundAnchorY()`	Pulley joint first ground anchor Y
`Object.Physics2::PulleyJointFirstLength()`	Pulley joint first length
`Object.Physics2::PulleyJointRatio()`	Pulley joint ratio
`Object.Physics2::PulleyJointSecondGroundAnchorX()`	Pulley joint second ground anchor X
`Object.Physics2::PulleyJointSecondGroundAnchorY()`	Pulley joint second ground anchor Y
`Object.Physics2::PulleyJointSecondLength()`	Pulley joint second length
`Object.Physics2::Restitution()`	Get the restitution of an object.
`Object.Physics2::RevoluteJointAngle()`	Revolute joint current angle
`Object.Physics2::RevoluteJointMaxAngle()`	Revolute joint maximum angle
`Object.Physics2::RevoluteJointMaxMotorTorque()`	Revolute joint maximum motor torque
`Object.Physics2::RevoluteJointMinAngle()`	Revolute joint minimum angle
`Object.Physics2::RevoluteJointMotorSpeed()`	Revolute joint motor speed
`Object.Physics2::RevoluteJointMotorTorque()`	Revolute joint motor torque
`Object.Physics2::RevoluteJointReferenceAngle()`	Revolute joint reference angle
`Object.Physics2::RevoluteJointSpeed()`	Revolute joint angular speed
`Object.Physics2::RopeJointMaxLength()`	Rope joint maximum length
`Object.Physics2::TimeScale()`	World time scale
`Object.Physics2::WeldJointDampingRatio()`	Weld joint damping ratio
`Object.Physics2::WeldJointFrequency()`	Weld joint frequency
`Object.Physics2::WeldJointReferenceAngle()`	Weld joint reference angle
`Object.Physics2::WheelJointAxisAngle()`	Wheel joint axis angle
`Object.Physics2::WheelJointDampingRatio()`	Wheel joint damping ratio
`Object.Physics2::WheelJointFrequency()`	Wheel joint frequency
`Object.Physics2::WheelJointMaxMotorTorque()`	Wheel joint maximum motor torque
`Object.Physics2::WheelJointMotorSpeed()`	Wheel joint motor speed
`Object.Physics2::WheelJointMotorTorque()`	Wheel joint motor torque
`Object.Physics2::WheelJointSpeed()`	Wheel joint speed
`Object.Physics2::WheelJointTranslation()`	Wheel joint current translation
`Object.Physics2::WorldScale()`	Return the world scale.

Player Authentication

Allow your game to authenticate players. Read more explanations about it.

Expression	Description
`PlayerAuthentication::UserID()`	Get the unique user ID of the authenticated player.
`PlayerAuthentication::Username()`	Get the username of the authenticated player.

Spine (experimental)

Display and smoothly animate a 2D object with skeletal animations made with Spine. Use files exported from Spine (json, atlas and image). Read more explanations about it.

Expression	Description
`Object.Animation()`	Return the duration of the smooth transition between 2 animations (in second).
`Object.PointAttachmentX()`	Return x position of spine point attachment.
`Object.PointAttachmentY()`	Return y position of spine point attachment.

Steamworks (Steam) (experimental)

Adds integrations for Steam's Steamworks game development SDK.

Expression	Description
`Steamworks::ActionVectorX()`	The action vector of a Steam Input analog joystick on the X-axis, from 1 (all right) to -1 (all left).
`Steamworks::ActionVectorY()`	The action vector of a Steam Input analog joystick on the Y-axis, from 1 (all up) to -1 (all down).
`Steamworks::AppBuildID()`	Gets the ID of the current app build.
`Steamworks::AppID()`	Obtains the game's Steam app ID, as declared in the games properties.
`Steamworks::BetaName()`	Gets the name of the beta the player enrolled to in the Steam game properties.
`Steamworks::ControllerCount()`	The amount of connected Steam Input controllers.
`Steamworks::CountryCode()`	The player's country represented as its two-letter code.
`Steamworks::CurrentLobbyAttribute()`	Obtains the value of one of the current lobby's attributes.
`Steamworks::CurrentLobbyID()`	The ID of the current lobby, useful for letting other players join it.
`Steamworks::CurrentLobbyMemberCount()`	Obtains the current lobby's member count.
`Steamworks::CurrentLobbyMemberLimit()`	Obtains the current lobby's maximum member limit.
`Steamworks::CurrentLobbyOwner()`	Obtains the Steam ID of the user that owns the current lobby.
`Steamworks::GameLanguage()`	Gets the language the user set in the Steam game properties.
`Steamworks::InstalledApplicationPath()`	Gets the path to an installed Steam application.
`Steamworks::Level()`	Obtains the player's Steam level
`Steamworks::LobbyAttribute()`	Obtains the value of one of a lobby's attributes.
`Steamworks::LobbyMemberCount()`	Obtains a lobby's member count.
`Steamworks::LobbyMemberLimit()`	Obtains a lobby's maximum member limit.
`Steamworks::LobbyOwner()`	Obtains the Steam ID of the user that owns a lobby.
`Steamworks::Name()`	The player's registered name on Steam.
`Steamworks::ReadCloudFile()`	Reads a file from Steam Cloud and returns its contents.
`Steamworks::ServerTime()`	Obtains the real current time from the Steam servers, which cannot be faked by changing the system time.
`Steamworks::SteamID()`	The player's unique Steam ID number. Note that it is too big a number to load correctly as a traditional number ("floating point number"), and must be used as a string.
`Steamworks::WorkshopItemDownloadProgress()`	The amount of data that has been downloaded by Steam for a currrently downloading item so far.
`Steamworks::WorkshopItemDownloadTotal()`	The amount of data that needs to be downloaded in total by Steam for a currrently downloading item.
`Steamworks::WorkshopItemInstallationTimestamp()`	The timestamp of the last time the contents file of an installed workshop item was updated.
`Steamworks::WorkshopItemLocation()`	The file path to the contents file of an installed workshop item.
`Steamworks::WorkshopItemSize()`	The size on disk taken by the contents file of an installed workshop item.

Text input (from extension Text Input)

A text field the player can type text into.

Expression	Description
`Object.BorderOpacity()`	Return the border opacity, between 0 (fully transparent) and 255 (opaque).
`Object.BorderWidth()`	Return the border width.
`Object.FillOpacity()`	Return the fill opacity, between 0 (fully transparent) and 255 (opaque).
`Object.Font size()`	Return the font size.
`Object.FontResourceName()`	Return the font name.
`Object.InputType()`	Return the input type.
`Object.Placeholder()`	Return the placeholder.

External Tilemap (Tiled/LDtk) collision mask (from extension Tile map)

Invisible object handling collisions with parts of a tilemap. Read more explanations about it.

No expressions for this object.

Tile map

Displays a tiled-based map. Read more explanations about it.

Expression	Description
`Object.GridColumnCount()`	Return the grid column count in the tile map.
`Object.GridRowCount()`	Return the grid row count in the tile map.
`Object.GridX()`	Get the grid column coordinates in the tile map corresponding to the scene coordinates.
`Object.GridY()`	Get the grid row coordinates in the tile map corresponding to the scene coordinates.
`Object.TileCenterX()`	Get the scene X position of the center of the tile.
`Object.TileCenterY()`	Get the scene Y position of the center of the tile.
`Object.TileIdAtGrid()`	Return the id of the tile at the grid coordinates.
`Object.TileIdAtPosition()`	Return the id of the tile at the scene coordinates.
`Object.TilesetColumnCount()`	Get the number of columns in the tileset.
`Object.TilesetRowCount()`	Get the number of rows in the tileset.

External Tilemap (Tiled/LDtk) (from extension Tile map)

Displays a tiled-based map, made with the Tiled editor (https://www.mapeditor.org/) or the LDtk editor (https://ldtk.io/). Read more explanations about it.

Expression	Description
`Object.AnimationFps()`	Get the animation speed (in frames per second)
`Object.AnimationSpeedScale()`	Get the Animation speed scale
`Object.LayerIndex()`	Get the layer index being displayed
`Object.LevelIndex()`	Return the level index being displayed..

Tweening

Animate object properties over time. This allows smooth transitions, animations or movement of objects to specified positions. Read more explanations about it.

Expression	Description
`Tween::Ease()`	Tween between 2 values according to an easing function.
`Tween::Progress()`	Return the progress of a tween (between 0.0 and 1.0).
`Tween::Value()`	Return the value of a tween. It is always 0 for tweens with several values.

Tween (from extension Tweening)

Smoothly animate position, angle, scale and other properties of objects. Read more explanations about it.

Expression	Description
`Object.Tween::Progress()`	Return the progress of a tween (between 0.0 and 1.0).
`Object.Tween::Value()`	Return the value of a tween. It is always 0 for tweens with several values.

Video

Displays a video. Read more explanations about it.

Expression	Description
`Object.CurrentTime()`	Return the current time of a video object (in seconds).
`Object.Duration()`	Return the duration of a video object (in seconds).
`Object.PlaybackSpeed()`	Return the playback speed of a video object
`Object.Volume()`	Get the volume of a video object, between 0 (muted) and 100 (maximum).