Platform behavior

The platformer engine allows to create controllable objects that can run and jump on other objects that are marked as platforms. It supports various features commonly found in platformers: grabbing the edge of a platform, sustaining the jump while a key is held, customizable gravity... It can be used for the player, but also for other objects moving on platforms. In this case though, it's recommended to first check if there is a simpler behavior that could be used. Read more explanations about it.

Conditions

Character is on given platform
Check if a platformer character is on a given platform.

Platform

Flag objects as being platforms which characters can run on.

Behavior actions

Platform type
Change the platform type of the object: Platform, Jump-Through, or Ladder.

No expressions for this behavior.

Platformer character

Jump and run on platforms.

Behavior actions

Acceleration
Change the horizontal acceleration of an object.

Platform grabbing
Enable (or disable) the ability of the object to grab platforms when falling near to one.

Deceleration
Change the horizontal deceleration of an object.

Gravity
Change the gravity applied on an object.

Ignore default controls
De/activate the use of default controls.
If deactivated, use the simulated actions to move the object.

Jump speed
Change the jump speed of an object. Its value is always positive.

Jump sustain time
Change the jump sustain time of an object.This is the time during which keeping the jump button held allow the initial jump speed to be maintained.

Ladder climbing speed
Change the ladder climbing speed.

Maximum falling speed
Change the maximum falling speed of an object.

Maximum horizontal speed
Change the maximum horizontal speed of an object.

Abort jump
Abort the current jump and stop the object vertically. This action doesn't have any effect when the character is not jumping.

Forbid jumping again in the air
This revokes the effect of "Allow jumping again". The object is made unable to jump while in mid air. This has no effect if the object is not in the air.

Current falling speed
Change the current falling speed of the object. This action doesn't have any effect when the character is not falling or is in the first phase of a jump.

Current horizontal speed
Change the current horizontal speed of the object. The object moves to the left with negative values and to the right with positive ones

Allow jumping again
When this action is executed, the object is able to jump again, even if it is in the air: this can be useful to allow a double jump for example. This is not a permanent effect: you must call again this action everytime you want to allow the object to jump (apart if it's on the floor).

Simulate control
Simulate a press of a key.
Valid keys are Left, Right, Jump, Ladder, Release Ladder, Up, Down.

Simulate down key press
Simulate a press of the down key (used when on a ladder).

Simulate jump key press
Simulate a press of the jump key.

Simulate ladder key press
Simulate a press of the ladder key (used to grab a ladder).

Simulate left key press
Simulate a press of the left key.

Simulate release ladder key press
Simulate a press of the Release Ladder key (used to get off a ladder).

Simulate release platform key press
Simulate a press of the release platform key (used when grabbing a platform ledge).

Simulate right key press
Simulate a press of the right key.

Simulate up key press
Simulate a press of the up key (used when on a ladder).

Behavior conditions

Acceleration
Compare the horizontal acceleration of the object.

Can grab platforms
Check if the object can grab the platforms.

Can jump
Check if the object can jump.

Current falling speed
Compare the current falling speed of the object. Its value is always positive.

Current jump speed
Compare the current jump speed of the object. Its value is always positive.

Current horizontal speed
Compare the current horizontal speed of the object. The object moves to the left with negative values and to the right with positive ones

Deceleration
Compare the horizontal deceleration of the object.

Gravity
Compare the gravity applied on the object.

Is falling
Check if the object is falling.
Note that the object can be flagged as jumping and falling at the same time: at the end of a jump, the fall speed becomes higher than the jump speed.

Is grabbing platform ledge
Check if the object is grabbing a platform ledge.

Is jumping
Check if the object is jumping.

Is on floor
Check if the object is on a platform.

Is on ladder
Check if the object is on a ladder.

Jump speed
Compare the jump speed of the object.Its value is always positive.

Jump sustain time
Compare the jump sustain time of the object.This is the time during which keeping the jump button held allow the initial jump speed to be maintained.

Ladder climbing speed
Compare the ladder climbing speed (in pixels per second).

Maximum falling speed
Compare the maximum falling speed of the object.

Maximum horizontal speed
Compare the maximum horizontal speed of the object.

Is moving
Check if the object is moving (whether it is on the floor or in the air).

Control pressed or simulated
A control was applied from a default control or simulated by an action.

Behavior expressions

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).

---

This page is an auto-generated reference page about the Platform behavior feature of GDevelop, the open-source, cross-platform game engine designed for everyone. Learn more about all GDevelop features here.