Hedgehog platformer

Jump and run on platforms at 360°.

Authors and contributors to this experimental extension: Kennoir, UnknownUney, D8H.

Warning

This is an extension made by a community member and it only got through a light review by the GDevelop extension team. As such, we can't guarantee it meets all the quality standards of fully reviewed extensions.

A platformer engine for Sonic-like games.

A small demo shows how to use this extension (open the project online).

Tip

Learn how to install new extensions by following a step-by-step guide.

Conditions

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

See parameters

Parameter 1 (👾 Object): Character
Parameter 2 (🧩 Behavior): Hedgehog platformer character
Parameter 3 (👾 Object): Platform
Parameter 4 (🧩 Behavior): Hedgehog platform

Character is pushing platform
Check if a platformer character is pushing against a platform.

See parameters

Parameter 1 (👾 Object): Character
Parameter 2 (🧩 Behavior): Hedgehog platformer character
Parameter 3 (👾 Object): Platform
Parameter 4 (🧩 Behavior): Hedgehog platform

Hedgehog platformer character

Jump and run on platforms at 360°.

Behavior actions

Follow current platform
Follow the current platform.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Movement angle
Check if the movement angle is around a given direction.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2 (🔢 Number): Angle (in degrees)
Parameter 3 (🔢 Number): Tolerance (in degrees)

Air drag
Change the air drag of the object. The air drag reduce the speed on X axis.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Air drag min speed Y
Change the air drag min speed Y of the object.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Airborne acceleration
Change the acceleration when the object is in the air.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

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 every time you want to allow the object to jump (apart if it's on the floor).

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

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.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Collision layer
Change the collision layer of the object, only interacts with hedgehog platforms of the same layer.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Deceleration
Change the deceleration of the object when changing of direction on the ground.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Downwards slope factor
Change the acceleration when running down a slope. The actual deceleration applied to the character depends on how steep the slope is.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Friction
Change the friction of the object. The friction is a deceleration when there is no input.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Gravity
Change the gravity of the object.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Grounded acceleration
Change the acceleration when the object is on the ground.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Jump height reducer
Change the Jump height reducer factor of the object.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Jump speed
Change the jump speed of the object.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Max speed
Change the max speed of the object while grounded.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Running lock remaining duration
Change the duration during which the character can't run left or right.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Rotate the object
Enable or disable rotation of the character when moving on the ground of falling from the ceilling.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2 (❓ Yes or No): ShouldRotate

Speed
Change the current speed of the object. The speed can be negative when the object is on the ground.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Horizontal speed
Change the current horizontal speed of the object. The object is automatically set in airborne state.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Vertical speed
Change the current vertical speed of the object. The object is automatically set in airborne state.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Stand max angle
Change the stand max angle of the object. Allow characters to fully stop on not too steep floors.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

Upwards slope factor
Change the deceleration factor when running up a slope. The actual deceleration applied to the character depends on how steep the slope is.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Operator
Parameter 3 (🔢 Number): Value

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

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

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

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

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

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Behavior conditions

Air drag
Compare the air drag of the object. The air drag reduce the speed on X axis.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Air drag min speed Y
Compare the air drag min speed Y of the object.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Airborne acceleration
Compare the acceleration when the object is in the air.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Can jump
Check if the object can jump.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Collision layer
Compare the collision layer of the object, only interacts with hedgehog platforms of the same layer. .

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Deceleration
Compare the deceleration of the object when changing of direction on the ground.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Downwards slope factor
Compare the acceleration when running down a slope. The actual deceleration applied to the character depends on how steep the slope is.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Friction
Compare the friction of the object. The friction is a deceleration when there is no input.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Gravity
Compare the gravity of the object.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Grounded acceleration
Compare the acceleration when the object is on the ground.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Is facing forward
Check if the character is facing forward.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is jumping
Check if the object is in the air because of a jump.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is moving
Checks if the object is moving.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

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

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is on left ledge
Check if the object is on the left ledge of a platform.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is on right ledge
Check if the object is on the right ledge of a platform.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is pushing
Check if the object is pushing againgst a wall.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is slipping
Check if the object is slipping.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

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

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2 (🔤 String): Key to check (one of: "Left", "Right", "Jump")

Jump height reducer
Compare the Jump height reducer factor of the object.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Jump speed
Compare the jump speed of the object.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Max speed
Compare the max speed of the object while grounded.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Running lock remaining duration
Compare the duration during which the character can't run left or right.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Rotate the object
Check if the character is rotated while moving on the ground of falling from the ceilling.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Speed
Compare the current speed of the object. The speed can be negative when the object is on the ground.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Horizontal speed
Compare the current horizontal speed of the object. The object is automatically set in airborne state.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Vertical speed
Compare the current vertical speed of the object. The object is automatically set in airborne state.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Stand max angle
Compare the stand max angle of the object. Allow characters to fully stop on not too steep floors.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Upwards slope factor
Compare the deceleration factor when running up a slope. The actual deceleration applied to the character depends on how steep the slope is.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2: 🟰 Relational operator
Parameter 3 (🔢 Number): Value to compare

Behavior expressions

Expression	Description
`Object.HedgehogCharacter::AirDrag()`	Return the air drag of the object. The air drag reduce the speed on X axis.
`Object.HedgehogCharacter::AirDragMinSpeedY()`	Return the air drag min speed Y of the object.
`Object.HedgehogCharacter::AirborneAcceleration()`	Return the acceleration when the object is in the air.
`Object.HedgehogCharacter::CollisionLayer()`	Return the collision layer of the object, only interacts with hedgehog platforms of the same layer. .
`Object.HedgehogCharacter::Deceleration()`	Return the deceleration of the object when changing of direction on the ground.
`Object.HedgehogCharacter::DownSlopeFactor()`	Return the acceleration when running down a slope. The actual deceleration applied to the character depends on how steep the slope is.
`Object.HedgehogCharacter::Friction()`	Return the friction of the object. The friction is a deceleration when there is no input.
`Object.HedgehogCharacter::Gravity()`	Return the gravity of the object.
`Object.HedgehogCharacter::GroundedAcceleration()`	Return the acceleration when the object is on the ground.
`Object.HedgehogCharacter::JumpReducer()`	Return the Jump height reducer factor of the object.
`Object.HedgehogCharacter::JumpSpeed()`	Return the jump speed of the object.
`Object.HedgehogCharacter::MaxSpeed()`	Return the max speed of the object while grounded.
`Object.HedgehogCharacter::MovementAngle()`	Return the angle (in degrees) in which the object is moving at.
`Object.HedgehogCharacter::RunningLockRemainingDuration()`	Return the duration during which the character can't run left or right.
`Object.HedgehogCharacter::Speed()`	Return the current speed of the object. The speed can be negative when the object is on the ground.
`Object.HedgehogCharacter::SpeedX()`	Return the current horizontal speed of the object. The object is automatically set in airborne state.
`Object.HedgehogCharacter::SpeedY()`	Return the current vertical speed of the object. The object is automatically set in airborne state.
`Object.HedgehogCharacter::StandMaxAngle()`	Return the stand max angle of the object. Allow characters to fully stop on not too steep floors.
`Object.HedgehogCharacter::UpSlopeFactor()`	Return the deceleration factor when running up a slope. The actual deceleration applied to the character depends on how steep the slope is.

Hedgehog character animator

Change animations and horizontal flipping of hedgehog characters automatically.

No expressions for this behavior.

Hedgehog character rolling

Toggle rolling mode.

Behavior actions

Simulate roll key press
Simulate a press of the Roll key. When characters stand still, they chouch instead of rolling.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Simulate spindash key press
Simulate a press of the spindash key.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Simulate spindash or jump key press
Simulate a press of the Spindash key when the character is crouching or the jump key otherwise.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Behavior conditions

Started a spindash
Check if the character has just started a spindash.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is charging a spindash
Check if the character is charging a spindash.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is crouching
Check if the character is crouching.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

Is rolling
Check if the character is rolling.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior

No expressions for this behavior.

Hedgehog platform

Flag objects as being platforms which characters can run on.

No expressions for this behavior.

Hedgehog spring

Push hedgehog characters.

Behavior actions

Push character
Make the spring push the character.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2 (👾 Object): Character
Parameter 3 (🧩 Behavior): Hedgehog platformer character

Behavior conditions

Can push
Check if the spring can push the character.

See parameters

Parameter 0: 👾 Object
Parameter 1: 🧩 Behavior
Parameter 2 (👾 Object): Character
Parameter 3 (🧩 Behavior): Hedgehog platformer character

No expressions for this behavior.

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