Touch events

Introduction¶

Built-in touch/mouse events of phaser.

Author: Richard Davey

Note

No touch input event fired in preload stage.

Usage¶

Quick start¶

Is touching

var pointer = scene.input.activePointer;
if (pointer.isDown) {
    var touchX = pointer.x;
    var touchY = pointer.y;
    // ...
}

On any touching start

scene.input.on('pointerdown', function(pointer){
    var touchX = pointer.x;
    var touchY = pointer.y;
    // ...
}, scope);

On any touching end

scene.input.on('pointerup', function(pointer){
    var touchX = pointer.x;
    var touchY = pointer.y;
    // ...
}, scope);

On touch game object start

gameObject.setInteractive().on('pointerdown', function(pointer, localX, localY, event){
    // ...
}, scope);

On touch game object end

gameObject.setInteractive().on('pointerup', function(pointer, localX, localY, event){
    // ...
}, scope);

Drag game object

gameObject
    .setInteractive({ draggable: true })
    .on('dragstart', function(pointer, dragX, dragY){
        // ...
    }, scope);
    .on('drag', function(pointer, dragX, dragY){
        gameObject.setPosition(dragX, dragY);
    }, scope);
    .on('dragend', function(pointer, dragX, dragY, dropped){
        // ...
    }, scope);

Reference : Properties of point

Register interactive¶

Call gameObject.setInteractive(...) to register touch input of Game Object before listening touching events.

Set hit area from width & height (rectangle) of the texture
```
gameObject.setInteractive();
```
Set hit area from game object
```
gameObject.setInteractive(shape, callback);
```
- Circle
  - shape : new Phaser.Geom.Circle(x, y, radius)
  - callback : Phaser.Geom.Circle.Contains
- Ellipse
  - shape : new Phaser.Geom.Ellipse(x, y, width, height)
  - callback : Phaser.Geom.Ellipse.Contains
- Rectangle
  - shape : new Phaser.Geom.Rectangle(x, y, width, height)
  - callback : Phaser.Geom.Rectangle.Contains
- Triangle
  - shape : new Phaser.Geom.Triangle(x1, y1, x2, y2, x3, y3)
  - callback : Phaser.Geom.Triangle.Contains
- Polygon
  - shape : new Phaser.Geom.Polygon(points)
  - callback : Phaser.Geom.Polygon.Contains
- Hexagon
  - shape : new Phaser.Geom.rexHexagon(x, y, size, type)
  - callback : Phaser.Geom.Polygon.Contains
- Rhombus
  - shape : new Phaser.Geom.rexRhombus(x, y, width, height)
  - callback : Phaser.Geom.Polygon.Contains
- Note: x, y relate to the top-left of the gameObject.

Set hit area from input plugin

scene.input.setHitArea(gameObjects, shape, callback);

Circle

scene.input.setHitAreaCircle(gameObjects, x, y, radius);
// scene.input.setHitAreaCircle(gameObjects, x, y, radius, callback); // callback = Circle.Contains

Ellipse

scene.input.setHitAreaEllipse(gameObjects, x, y, width, height);
// scene.input.setHitAreaEllipse(gameObjects, x, y, width, height, callback); // callback = Ellipse.Contains

Rectangle

scene.input.setHitAreaRectangle(gameObjects, x, y, width, height);
// scene.input.setHitAreaRectangle(gameObjects, x, y, width, height, callback); // callback = Rectangle.Contains

Triangle

scene.input.setHitAreaTriangle(gameObjects, x1, y1, x2, y2, x3, y3);
// scene.input.setHitAreaTriangle(gameObjects, x1, y1, x2, y2, x3, y3, callback); // callback = Triangle.Contains

Note: x, y relate to the top-left of the gameObject.

Set interactive configuration

gameObject.setInteractive({
    hitArea: shape,
    hitAreaCallback: callback,
    hitAreaDebug: shape,
    draggable: false,
    dropZone: false,
    useHandCursor: false,
    cursor: CSSString,
    pixelPerfect: false,
    alphaTolerance: 1
});

Hit area
- shape
- Pixel alpha
  - pixelPerfect : true
  - alphaTolerance : 1 (0-255)
- Custom hit-testing function
  - hitAreaCallback
```
function(shape, x, y, gameObject) {
    return hit;  // true/false
}
```
    - shape : Hit area object
    - x, y : Local position of texture.
    - gameObject : Game object.
- hitAreaDebug : Debug shape.
Dragging
- draggable : true
Drop zone
- dropZone : true
Cursor
- cursor : CSS string
- useHandCursor : true

Pixel perfect hit-testing

This is an expensive process, should only be enabled on Game Objects that really need it.

Disable interactive¶

Disable temporary
```
gameObject.disableInteractive();
// gameObject.disableInteractive(resetCursor);
```
- resetCursor : Should the currently active Input cursor, if any, be reset to the default cursor?
Remove interaction
```
gameObject.removeInteractive();
// gameObject.removeInteractive(resetCursor);
```
- resetCursor : Should the currently active Input cursor, if any, be reset to the default cursor?

Top only¶

When set to true this Input Plugin will emulate DOM behavior by only emitting events from the top-most Game Objects in the Display List. If set to false it will emit events from all Game Objects below a Pointer, not just the top one.

Get
```
var topOnly = scene.input.topOnly;
```

Set

scene.input.topOnly = topOnly;
scene.input.setTopOnly(topOnly);

Each scene can has its own scene.input.topOnly setting.

Touch events¶

Trigger these events from top scene to bottom scene.

Events on touched Game object

gameObject.on('pointerdown', function(pointer, localX, localY, event){ /* ... */ }, scope);
gameObject.on('pointerup', function(pointer, localX, localY, event){ /* ... */ }, scope);
gameObject.on('pointermove', function(pointer, localX, localY, event){ /* ... */ }, scope);
gameObject.on('pointerover', function(pointer, localX, localY, event){ /* ... */ }, scope);
gameObject.on('pointerout', function(pointer, event){ /* ... */ }, scope);

Cancel remaining touched events

function(pointer, localX, localY, event) {
    event.stopPropagation();
}

Event on input plugin for each touched Game object

scene.input.on('gameobjectdown', function(pointer, gameObject, event){ /* ... */ }, scope);
scene.input.on('gameobjectup', function(pointer, gameObject, event){ /* ... */ }, scope);
scene.input.on('gameobjectmove', function(pointer, gameObject, event){ /* ... */ }, scope);
scene.input.on('gameobjectover', function(pointer, gameObject, event){ /* ... */ }, scope);
scene.input.on('gameobjectout', function(pointer, gameObject, event){ /* ... */ }, scope);

Cancel remaining touched events

function(pointer, gameObject, event) {
    event.stopPropagation();
}

Events to get all touched Game Objects

scene.input.on('pointerdown', function(pointer, currentlyOver){ /* ... */ }, scope);
scene.input.on('pointerdownoutside', function(pointer){ /* ... */ }, scope);
scene.input.on('pointerup', function(pointer, currentlyOver){ /* ... */ }, scope);
scene.input.on('pointerupoutside', function(pointer){ /* ... */ }, scope);
scene.input.on('pointermove', function(pointer, currentlyOver){ /* ... */ }, scope);
scene.input.on('pointerover', function(pointer, justOver){ /* ... */ }, scope);
scene.input.on('pointerout', function(pointer, justOut){ /* ... */ }, scope);
scene.input.on('gameout', function(timeStamp, domEvent){ /* ... */ }, scope);
scene.input.on('gameover', function(timeStamp, domEvent){ /* ... */ }, scope);

Check pointer.camera in multiple-cameras scene.

Game canvas¶

scene.input.on('gameout', function(timeStamp, event){ /* ... */ }, scope);
scene.input.on('gameover', function(timeStamp, event){ /* ... */ }, scope);

Dragging¶

Enable dragging¶

Enable dragging when registering interactive

gameObject.setInteractive({ draggable: true });

Enable dragging and add it to dragging detecting list after registered interactive
```
scene.input.setDraggable(gameObject);
```
Enable dragging
```
gameObject.input.draggable = true;
```

Disable dragging¶

Remove Game Object from dragging detecting list

scene.input.setDraggable(gameObject, false);

Disable dragging but keep it in dragging detecting list
```
gameObject.input.draggable = false;
```

Dragging events¶

gameObject.on('dragstart', function(pointer, dragX, dragY){ /* ... */ }, scope);
gameObject.on('drag', function(pointer, dragX, dragY){ /* ... */ }, scope);
gameObject.on('dragend', function(pointer, dragX, dragY, dropped){ /* ... */ }, scope);

scene.input.on('dragstart', function(pointer, gameObject){ /* ... */ }, scope);
scene.input.on('drag', function(pointer, gameObject, dragX, dragY){ /* ... */ }, scope);
scene.input.on('dragend', function(pointer, gameObject, dropped){ /* ... */ }, scope);

dropped : 'dragend' and also 'drop'.

Dragging properties¶

scene.input.dragDistanceThreshold = 16;
scene.input.dragTimeThreshold = 500;

Drop zone¶

Enable drop zone¶

Enable dropping when registering interactive

gameObject.setInteractive({ dropZone: true });

Enable dropping after registered interactive
```
gameObject.input.dropZone = true;
```

Disable drop zone¶

gameObject.input.dropZone = false;

Dropping events¶

gameObject.on('drop', function(pointer, target){ /* ... */ }, scope);

gameObject.on('dragenter', function(pointer, target){ /* ... */ }, scope);
gameObject.on('dragover', function(pointer, target){ /* ... */ }, scope);
gameObject.on('dragleave', function(pointer, target){ /* ... */ }, scope);

scene.input.on('drop', function(pointer, gameObject, target){ /* ... */ }, scope);

scene.input.on('dragenter', function(pointer, gameObject, target){ /* ... */ }, scope);
scene.input.on('dragover', function(pointer, gameObject, target){ /* ... */ }, scope);
scene.input.on('dragleave', function(pointer, gameObject, target){ /* ... */ }, scope);

Force state of pointer¶

Down state
```
scene.input.forceDownState(pointer, gameObject);
```
- Emit 'pointerdown' event from game object.
- Emit 'gameobjectdown' event from scene.input.
Up state
```
scene.input.forceUpState(pointer, gameObject);
```
- Emit 'pointerup' event from game object.
- Emit 'gameobjectup' event from scene.input.
Over state
```
scene.input.forceOverState(pointer, gameObject);
```
- Emit 'pointerover' event from game object.
- Emit 'gameobjectover' event from scene.input.
Out state
```
scene.input.forceOutState(pointer, gameObject);
```
- Emit 'pointerout' event from game object.
- Emit 'gameobjectout' event from scene.input.

First event of all¶

scene.input.on('preupdate', function() { /* ... */ }, scope);

Single touch¶

Pointer¶

var pointer = scene.input.activePointer;

Multi-touch¶

Amount of active pointers¶

Set amount of active pointers in game configuration

var config = {
    // ...
    input: {
        activePointers: 1,
        // ...
    }
};
var game = new Phaser.Game(config);

Or add pointers in run-time.

scene.input.addPointer(num);  // total points = num + 1

Pointers¶

pointer 1 ~ 10

var pointer = scene.input.pointer1;
// ...
var pointer = scene.input.pointer10;

pointer n

var pointer = scene.input.manager.pointers[n];

Amount of total pointers
```
var amount = scene.input.manager.pointersTotal;
```
- 1 in desktop
- 2 in touch device. (0 for mouse, 1 for 1 touch pointer)

Pointer¶

Position
- Current touching
  - Position in screen : pointer.x , pointer.y
  - Position in camera :
    - Single camera :
      var worldX = pointer.worldX; var worldY = pointer.worldY;
    - Multiple cameras :
      var worldXY = pointer.positionToCamera(camera); // worldXY: {x, y} // var worldXY = pointer.positionToCamera(camera, worldXY); var worldX = worldXY.x; var worldY = worldXY.y;
    - Camera
      var camera = pointer.camera;
  - Position of previous moving : pointer.prevPosition.x , pointer.prevPosition.y
    - Updating when pointer-down, potiner-move, or pointer-up.
  - Interpolated position :
```
var points = pointer.getInterpolatedPosition(step);
// var out = pointer.getInterpolatedPosition(step, out);
```
- Drag
  - Touching start : pointer.downX, pointer.downY
  - Touching end : pointer.upX, pointer.upY
  - Drag distance between pointer-down to latest pointer : pointer.getDistance()
    - Horizontal drag distance : pointer.getDistanceX()
    - Vertical drag distance : pointer.getDistanceY()
  - Drag angle : pointer.getAngle()
Time
- Touching start : pointer.downTime
- Touching end : pointer.upTime
- Drag : pointer.getDuration()
Touch state
- Is touching/any button down : pointer.isDown
- Is primary button down : pointer.primaryDown
Button state : pointer.button
- On Touch devices the value is always 0.
Button down
- No button down : pointer.noButtonDown()
- Is primary (left) button down : pointer.leftButtonDown()
- Is secondary (right) button down : pointer.rightButtonDown()
- Is middle (mouse wheel) button down : pointer.middleButtonDown()
- Is back button down : pointer.backButtonDown()
- Is forward button down : pointer.forwardButtonDown()
Button released
- Is primary (left) button released : pointer.leftButtonReleased()
- Is secondary (right) button released : pointer.rightButtonReleased()
- Is middle (mouse wheel) button released : pointer.middleButtonReleased()
- Is back button released : pointer.backButtonReleased()
- Is forward button released : pointer.forwardButtonReleased()
Index in scene.input.manager.pointers : pointer.id
Motion
- Angle: pointer.angle
- Distance: pointer.distance
- Velocity: pointer.velocity
  - pointer.velocity.x, `pointer.velocity.y

Input object¶

gameObject.input : Game object's input object.
gameObject.input.localX, gameObject.input.localY : Pointer to local position of texture.
gameObject.input.dragStartX, gameObject.input.dragStartY : The x/y coordinate of the Game Object that owns this Interactive Object when the drag started.
gameObject.input.dragStartXGlobal, gameObject.input.dragStartYGlobal : The x/y coordinate that the Pointer started dragging this Interactive Object from.
gameObject.input.dragX, gameObject.input.dragY : The x/y coordinate that this Interactive Object is currently being dragged to.

Smooth¶

Get touch position from interpolation of previous touch position and current touch position.

Touch-position = (current-touch-position * smooth-factor) + (previous-touch-position * (1 - smooth-factor))

Set smooth factor. In game configuration

var config = {
    // ....
    input: {
        smoothFactor: 0
    }
}

Get touch position

var x = pointer.x;
var y = pointer.y;
var worldX = pointer.worldX;
var worldY = pointer.worldY;

Debug¶

Enable, draw shape of (shape) hit area.

scene.input.enableDebug(gameObject);
// scene.input.enableDebug(gameObject, color);

Disable
```
scene.input.removeDebug(gameObject);
```

Get debug shape game object

var shape = gameObject.input.hitAreaDebug;

Poll rate¶

Poll when touches moved, or updated. Default behavior.
```
scene.input.setPollOnMove();
```
Poll every tick.
```
scene.input.setPollAlways();
```
Set poll rate.
```
scene.input.setPollRate(rate);
```