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<h1 class="file-heading">File: src\components\Box.ts</h1>
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/**
*
* @module Kiwi
* @submodule Components
*
*/
module Kiwi.Components {
/**
* The Box Component is used to handle the various 'bounds' that each GameObject has.
* There are two main different types of bounds (Bounds and Hitbox) with each one having three variants (each one is a rectangle) depending on what you are wanting:
*
* RawBounds: The bounding box of the GameObject before rotation/scale.
*
* RawHitbox: The hitbox of the GameObject before rotation/scale. This can be modified to be different than the normal bounds but if not specified it will be the same as the raw bounds.
*
* Bounds: The bounding box of the GameObject after rotation/scale.
*
* Hitbox: The hitbox of the GameObject after rotation/scale. If you modified the raw hitbox then this one will be modified as well, otherwise it will be the same as the normal bounds.
*
* WorldBounds: The bounding box of the Entity using its world coordinates and after rotation/scale.
*
* WorldHitbox: The hitbox of the Entity using its world coordinates and after rotation/scale.
*
* @class Box
* @extends Kiwi.Component
* @namespace Kiwi.Components
* @constructor
* @param parent {Kiwi.Entity} The entity that this box belongs to.
* @param [x=0] {Number} Its position on the x axis
* @param [y=0] {Number} Its position on the y axis
* @param [width=0] {Number} The width of the box.
* @param [height=0] {Number} The height of the box.
* @return {Kiwi.Components.Box}
*/
export class Box extends Component {
constructor(parent: Entity, x: number = 0, y: number = 0, width: number = 0, height: number = 0) {
super(parent, 'Box');
this.entity = parent;
this._rawBounds = new Kiwi.Geom.Rectangle(x,y,width,height);
this._rawCenter = new Kiwi.Geom.Point(x + width / 2, y + height / 2);
this._rawHitbox = new Kiwi.Geom.Rectangle();
this._hitboxOffset = new Kiwi.Geom.Point();
this.hitbox = new Kiwi.Geom.Rectangle(0, 0, width, height);
this.autoUpdate = true;
this._scratchMatrix = new Kiwi.Geom.Matrix();
}
/**
* The entity that this box belongs to.
* @property entity
* @type Kiwi.Entity
* @public
*/
public entity: Kiwi.Entity;
/**
* The type of object that this is.
* @method objType
* @return {string} "Box"
* @public
*/
public objType() {
return "Box";
}
/**
* Controls whether the hitbox should update automatically to match the hitbox of the current cell on the entity this Box component is attached to (default behaviour).
* Or if the hitbox shouldn't auto update. Which will mean it will stay the same as the last value it had.
* This property is automatically set to 'false' when you override the hitboxes width/height, but you can set this to true afterwards.
*
* @property autoUpdate
* @type boolean
* @default true
* @private
*/
public autoUpdate: boolean = true;
/**
* Indicates whether or not this component needs re-rendering/updating or not.
* @property dirty
* @type boolean
* @public
* @deprecated in version 1.1.0 because the box always needed updating
*/
public dirty: boolean;
/**
* Contains offset point for the hitbox
* @property _hitboxOffset
* @type Kiwi.Geom.Point
* @private
*/
private _hitboxOffset: Kiwi.Geom.Point;
/**
* Returns the offset value of the hitbox as a point for the X/Y axis for the developer to use.
* This is without rotation or scaling.
* This is a READ ONLY property.
* @property hitboxOffset
* @type Kiwi.Geom.Point
* @public
*/
public get hitboxOffset(): Kiwi.Geom.Point {
if ( this.autoUpdate == true && this.entity.atlas !== null && this.entity.atlas.cells && this.entity.atlas.cells[ 0 ].hitboxes ) {
this._hitboxOffset.x =
this.entity.atlas.cells[this.entity.cellIndex].hitboxes[0].x || 0;
this._hitboxOffset.y =
this.entity.atlas.cells[this.entity.cellIndex].hitboxes[0].y || 0;
}
return this._hitboxOffset;
}
/**
* Contains the offset rectangle for the raw hitbox.
* @property _rawHitbox
* @type Kiwi.Geom.Rectangle
* @private
*/
private _rawHitbox: Kiwi.Geom.Rectangle;
/**
* Returns the raw hitbox rectangle for the developer to use.
* 'Raw' means where it would be without rotation or scaling.
* This is READ ONLY.
* @property rawHitbox
* @type Kiwi.Geom.Rectangle
* @public
*/
public get rawHitbox(): Kiwi.Geom.Rectangle {
this._rawHitbox.x = this.rawBounds.x + this.hitboxOffset.x;
this._rawHitbox.y = this.rawBounds.y + this.hitboxOffset.y;
//If the hitbox has not already been set, then update the width/height based upon the current cell that the entity has.
if (this.autoUpdate == true) {
var atlas = this.entity.atlas;
if ( atlas !== null && atlas.cells && atlas.cells[ 0 ].hitboxes ) {
this._rawHitbox.width = atlas.cells[ this.entity.cellIndex ].hitboxes[ 0 ].w;
this._rawHitbox.height = atlas.cells[ this.entity.cellIndex ].hitboxes[ 0 ].h;
} else {
this._rawHitbox.width = this.entity.width;
this._rawHitbox.height = this.entity.height;
}
}
return this._rawHitbox;
}
/**
* The transformed or 'normal' hitbox for the entity. This is its box after rotation/scale.
* @property _transformedHitbox
* @type Kiwi.Geom.Rectangle
* @private
*/
private _transformedHitbox: Kiwi.Geom.Rectangle;
/**
* The transformed 'world' hitbox for the entity. This is its box after rotation/scale.
* @property _worldHitbox
* @type Kiwi.Geom.Rectangle
* @private
*/
private _worldHitbox: Kiwi.Geom.Rectangle;
/**
* The 'normal' or transformed hitbox for the entity. This is its box after rotation/Kiwi.Geom.Rectangle.
* @property hitbox
* @type Kiwi.Geom.Rectangle
* @public
*/
public get hitbox(): Kiwi.Geom.Rectangle {
this._transformedHitbox = this._rotateHitbox(this.rawHitbox.clone());
return this._transformedHitbox;
}
public set hitbox(value: Kiwi.Geom.Rectangle) {
//Use custom hitbox defined by user.
this._hitboxOffset.x = value.x;
this._hitboxOffset.y = value.y;
this._rawHitbox = value;
this._rawHitbox.x += this._rawBounds.x;
this._rawHitbox.y += this._rawBounds.y;
this.autoUpdate = false;
}
/**
* Returns the transformed hitbox for the entity using its 'world' coordinates.
* This is READ ONLY.
* @property worldHitbox
* @type Kiwi.Geom.Rectangle
* @public
*/
public get worldHitbox(): Kiwi.Geom.Rectangle {
this._worldHitbox = this._rotateHitbox(this.rawHitbox.clone(), true);
return this._worldHitbox;
}
/**
* The 'raw' bounds of entity. This is its bounds before rotation/scale.
* This for property is only for storage of the values and should be accessed via the getter 'rawBounds' so that it can update.
*
* @property _rawBounds
* @type Kiwi.Geom.Rectangle
* @private
*/
private _rawBounds: Kiwi.Geom.Rectangle;
/**
* Returns the 'raw' bounds for this entity.
* This is READ ONLY.
* @property rawBounds
* @type Kiwi.Geom.Rectangle
* @public
*/
public get rawBounds(): Kiwi.Geom.Rectangle {
this._rawBounds.x = this.entity.x;
this._rawBounds.y = this.entity.y;
this._rawBounds.width = this.entity.width;
this._rawBounds.height = this.entity.height;
return this._rawBounds;
}
/**
* Contains the 'raw' center point for the bounds.
* @property Kiwi.Geom.Point
* @type Kiwi.Geom.Point
* @private
*/
private _rawCenter: Kiwi.Geom.Point;
/**
* Returns the raw center point of the box.
* This is READ ONLY.
* @property rawCenter
* @type Kiwi.Geom.Point
* @public
*/
public get rawCenter(): Kiwi.Geom.Point {
this._rawCenter.x = this.rawBounds.x + this.rawBounds.width / 2;
this._rawCenter.y = this.rawBounds.y + this.rawBounds.height / 2;
return this._rawCenter;
}
/**
* Scratch matrix used in geometry calculations
*
* @property _scratchMatrix
* @type Kiwi.Geom.Matrix
* @private
* @since 1.3.1
*/
private _scratchMatrix: Kiwi.Geom.Matrix;
/**
* Contains the center point after the box has been transformed.
* @property _transformedCenter
* @type Kiwi.Geom.Point
* @private
*/
private _transformedCenter: Kiwi.Geom.Point;
/**
* Returns the center point for the box after it has been transformed.
* World coordinates.
* This is READ ONLY.
* @property center
* @type Kiwi.Geom.Point
* @public
*/
public get center(): Kiwi.Geom.Point {
var m: Kiwi.Geom.Matrix = this.entity.transform.getConcatenatedMatrix();
this._transformedCenter = m.transformPoint(
new Kiwi.Geom.Point(
this.entity.width / 2 - this.entity.anchorPointX,
this.entity.height / 2 - this.entity.anchorPointY ) );
return this._transformedCenter;
}
/**
* Contains the transformed or 'normal' bounds for this entity.
* @property _transformedBounds
* @type Kiwi.Geom.Rectangle
* @private
*/
private _transformedBounds: Kiwi.Geom.Rectangle;
/**
* The 'world' transformed bounds for this entity.
* @property _worldBounds
* @type Kiwi.Geom.Rectangle
* @private
*/
private _worldBounds: Kiwi.Geom.Rectangle;
/**
* Returns the 'transformed' or 'normal' bounds for this box.
* This is READ ONLY.
* @property bounds
* @type Kiwi.Geom.Rectangle
* @public
*/
public get bounds(): Kiwi.Geom.Rectangle {
this._transformedBounds = this._rotateRect(this.rawBounds.clone());
return this._transformedBounds;
}
/**
* Returns the 'transformed' bounds for this entity using the world coodinates.
* This is READ ONLY.
* @property worldBounds
* @type Kiwi.Geom.Rectangle
* @public
*/
public get worldBounds(): Kiwi.Geom.Rectangle {
this._worldBounds = this._rotateRect(this.rawBounds.clone(), true);
return this._worldBounds;
}
/**
* Private internal method only. Used to calculate the transformed bounds after rotation/scale.
* @method _rotateRect
* @param rect {Kiwi.Geom.Rectangle}
* @param [useWorldCoords=false] {Boolean}
* @return {Kiwi.Geom.Rectangle}
* @private
*/
private _rotateRect(rect: Kiwi.Geom.Rectangle, useWorldCoords: boolean=false): Kiwi.Geom.Rectangle {
var out: Kiwi.Geom.Rectangle = new Kiwi.Geom.Rectangle();
var t: Kiwi.Geom.Transform = this.entity.transform;
var m: Kiwi.Geom.Matrix = this._scratchMatrix.copyFrom(
t.getConcatenatedMatrix() );
// Use world coordinates?
if( !useWorldCoords )
{
m.setTo(m.a, m.b, m.c, m.d, t.x + t.rotPointX, t.y + t.rotPointY);
}
out = this.extents(
m.transformPoint({ x: - t.rotPointX, y: - t.rotPointY }),
m.transformPoint({ x: - t.rotPointX + rect.width, y: - t.rotPointY }),
m.transformPoint({ x: - t.rotPointX + rect.width, y: - t.rotPointY + rect.height }),
m.transformPoint({ x: - t.rotPointX, y: - t.rotPointY + rect.height })
);
return out;
}
/**
* A private method that is used to calculate the transformed hitbox's coordinates after rotation.
* @method _rotateHitbox
* @param rect {Kiwi.Geom.Rectangle}
* @param [useWorldCoords=false] {Boolean}
* @return {Kiwi.Geom.Rectangle}
* @private
*/
private _rotateHitbox(rect: Kiwi.Geom.Rectangle, useWorldCoords: boolean=false): Kiwi.Geom.Rectangle {
var out: Kiwi.Geom.Rectangle = new Kiwi.Geom.Rectangle();
var t: Kiwi.Geom.Transform = this.entity.transform;
var m: Kiwi.Geom.Matrix = this._scratchMatrix.copyFrom(
t.getConcatenatedMatrix() );
//Use world coordinates?
if( !useWorldCoords )
{
m.setTo(m.a, m.b, m.c, m.d, t.x + t.rotPointX, t.y + t.rotPointY);
}
out = this.extents(
m.transformPoint({ x: - t.rotPointX + this._hitboxOffset.x, y: - t.rotPointY + this._hitboxOffset.y }),
m.transformPoint({ x: - t.rotPointX + rect.width + this._hitboxOffset.x, y: - t.rotPointY + this._hitboxOffset.y }),
m.transformPoint({ x: - t.rotPointX + rect.width + this._hitboxOffset.x, y: - t.rotPointY + rect.height + this._hitboxOffset.y}),
m.transformPoint({ x: - t.rotPointX + this._hitboxOffset.x, y: - t.rotPointY + rect.height + this._hitboxOffset.y })
);
return out;
}
/**
* Draws the various bounds on a context that is passed. Useful for debugging and using in combination with the debug canvas.
* @method draw
* @param ctx {CanvasRenderingContext2D} Context of the canvas that this box component is to be rendered on top of.
* @param [camera] {Kiwi.Camera} A camera that should be taken into account before rendered. This is the default camera by default.
* @public
*/
public draw(ctx: CanvasRenderingContext2D, camera: Kiwi.Camera = this.game.cameras.defaultCamera) {
var t: Kiwi.Geom.Transform = this.entity.transform;
var ct: Kiwi.Geom.Transform = camera.transform;
// Draw raw bounds and raw center
ctx.strokeStyle = "red";
ctx.fillRect(this.rawCenter.x + ct.x - 1, this.rawCenter.y + ct.y - 1, 3, 3);
ctx.strokeRect(t.x + ct.x + t.rotPointX - 3, t.y + ct.y + t.rotPointY - 3, 7, 7);
// Draw bounds
ctx.strokeStyle = "blue";
ctx.strokeRect(this.bounds.x + ct.x, this.bounds.y + ct.y, this.bounds.width, this.bounds.height);
// Draw hitbox
ctx.strokeStyle = "green";
ctx.strokeRect(this.hitbox.x + ct.x, this.hitbox.y + ct.y, this.hitbox.width, this.hitbox.height);
// Draw raw hitbox
ctx.strokeStyle = "white";
ctx.strokeRect(this.rawHitbox.x + ct.x, this.rawHitbox.y + ct.y, this.rawHitbox.width, this.rawHitbox.height);
// Draw world bounds
ctx.strokeStyle = "purple";
ctx.strokeRect(this.worldBounds.x, this.worldBounds.y, this.worldBounds.width, this.worldBounds.height);
// Draw world hitbox
ctx.strokeStyle = "cyan";
ctx.strokeRect(this.worldHitbox.x, this.worldHitbox.y, this.worldHitbox.width, this.worldHitbox.height);
}
/**
* Method which takes four Points and then converts it into a Rectangle, which represents the area those points covered.
* The points passed can be maybe in any order, as the are checked for validity first.
*
* @method extents
* @param topLeftPoint {Kiwi.Geom.Point} The top left Point that the Rectangle should have.
* @param topRightPoint {Kiwi.Geom.Point} The top right Point that the Rectangle should have.
* @param bottomRightPoint {Kiwi.Geom.Point} The bottom right Point that the Rectangle should have.
* @param bottomLeftPoint {Kiwi.Geom.Point} The bottom left Point that the Rectangle should have.
* @return {Kiwi.Geom.Rectangle} The new Rectangle that represents the area the points covered.
* @return Rectangle
*/
public extents(topLeftPoint:Kiwi.Geom.Point, topRightPoint:Kiwi.Geom.Point, bottomRightPoint:Kiwi.Geom.Point, bottomLeftPoint:Kiwi.Geom.Point):Kiwi.Geom.Rectangle {
var left: number = Math.min(topLeftPoint.x, topRightPoint.x, bottomRightPoint.x, bottomLeftPoint.x);
var right: number = Math.max(topLeftPoint.x, topRightPoint.x, bottomRightPoint.x, bottomLeftPoint.x);
var top: number = Math.min(topLeftPoint.y, topRightPoint.y, bottomRightPoint.y, bottomLeftPoint.y);
var bottom: number = Math.max(topLeftPoint.y, topRightPoint.y, bottomRightPoint.y, bottomLeftPoint.y);
return new Kiwi.Geom.Rectangle(left, top, right - left, bottom - top);
}
/**
* Destroys this component and all of the links it may have to other objects.
* @method destroy
* @public
*/
public destroy() {
super.destroy();
delete this.entity;
}
}
}
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