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<h1 class="file-heading">File: src\components\ArcadePhysics.ts</h1>
<div class="file">
<pre class="code prettyprint linenums">
/**
*
* @module Kiwi
* @submodule Components
*
*/
module Kiwi.Components {
/**
* Arcade Physics is an Optional Component that can be used when you are wanting to do basic physics collisions.
* These have been ported from Flixel, so most function operate identically to the original flixel functions, though some
* have been split into multiple functions. Generally where functions originally accepted
* either groups or gameobjects within the same argument, the ported functions one or the other.
* http://www.flixel.org/
* http://www.adamatomic.com/
*
* @class ArcadePhysics
* @constructor
* @namespace Kiwi.Components
* @param entity {Kiwi.Entity} The Entity that this ArcadePhysics should be used on.
* @param box {Kiwi.Components.Box} The box component that holds the hitbox that should be used when resolving and calculating collisions.
* @return {Kiwi.Components.ArcadePhysics}
* @extends Kiwi.Component
*
* @author Adam 'Atomic' Saltsman, Flixel
*
*/
export class ArcadePhysics extends Kiwi.Component {
constructor(entity:Kiwi.Entity, box?: Kiwi.Components.Box) {
super(entity,'ArcadePhysics');
this.parent = entity;
this.box = box;
this.transform = this.parent.transform;
this.last = new Kiwi.Geom.Point(this.transform.worldX, this.transform.worldY);
this.mass = 1.0;
this.elasticity = 0.0;
this.immovable = false;
this.moves = true;
this.touching = ArcadePhysics.NONE;
this.wasTouching = ArcadePhysics.NONE;
this.allowCollisions = ArcadePhysics.ANY;
this.velocity = new Kiwi.Geom.Point();
this.acceleration = new Kiwi.Geom.Point();
this.drag = new Kiwi.Geom.Point();
this.maxVelocity = new Kiwi.Geom.Point(10000, 10000);
this.angularVelocity = 0;
this.angularAcceleration = 0;
this.angularDrag = 0;
this.maxAngular = 10000;
}
/**
* The transform component of the entity that the ArcadePhysics is a part of.
* @property transform
* @type Kiwi.Geom.Transform
* @public
*/
public transform: Kiwi.Geom.Transform;
/**
* The bounding box component that the collisions are going to be based off.
* You can modify the 'hitbox' of that component to modify the collision area.
*
* @property box
* @type Kiwi.Components.Box
* @public
*/
public box: Kiwi.Components.Box;
/**
* Whether an object will move/alter position after a collision.
* @property immovable
* @type boolean
* @public
*/
public immovable: boolean;
/**
* The basic speed of this object.
* You can modify the values contained inside this Object to change the speed.
*
* @property velocity
* @type Kiwi.Geom.Point
* @public
*/
public velocity: Kiwi.Geom.Point;
/**
* The virtual mass of the object. Default value is 1.
* Currently only used with <code>elasticity</code> during collision resolution.
* Change at your own risk; effects seem crazy unpredictable so far!
* @property mass
* @type number
* @public
*/
public mass: number;
/**
* The bounciness of this object. Only affects collisions. Default value is 0, or "not bouncy at all."
* @property elasticity
* @type number
* @public
*/
public elasticity: number;
/**
* How fast the speed of this object is changing.
* Useful for smooth movement and gravity.
*
* @property acceleration
* @type Kiwi.Geom.Point
* @public
*/
public acceleration: Kiwi.Geom.Point;
/**
* This isn't drag exactly, more like deceleration that is only applied
* when acceleration is not affecting the sprite.
* @property drag
* @type Kiwi.Geom.Point
* @public
*/
public drag: Kiwi.Geom.Point;
/**
* If you are using <code>acceleration</code>, you can use <code>maxVelocity</code> with it
* to cap the speed automatically (very useful!).
* @property maxVelocity
* @type Kiwi.Geom.Point
* @public
*/
public maxVelocity: Kiwi.Geom.Point;
/**
* This is how fast you want this sprite to spin.
* @property angularVelocity
* @type number
* @public
*/
public angularVelocity: number;
/**
* How fast the spin speed should change.
* @property angularAcceleration
* @type number
* @public
*/
public angularAcceleration: number;
/**
* Like <code>drag</code> but for spinning.
* @property angularDrag
* @type number
* @public
*/
public angularDrag: number;
/**
* Use in conjunction with <code>angularAcceleration</code> for fluid spin speed control.
* @property maxAngular
* @type number
* @public
*/
public maxAngular: number;
/**
* If the Entity that this component is a part of 'moves' or not, and thus if the physics should update the motion should update each frame.
* @property moves
* @type boolean
* @default true
* @public
*/
public moves: boolean;
/**
* Bit field of flags (use with UP, DOWN, LEFT, RIGHT, etc) indicating surface contacts.
* Use bitwise operators to check the values stored here, or use touching(), justStartedTouching(), etc.
* You can even use them broadly as boolean values if you're feeling saucy!
* @property touching
* @type number
* @public
*/
public touching: number;
/**
* Bit field of flags (use with UP, DOWN, LEFT, RIGHT, etc) indicating surface contacts from the previous game loop step.
* Use bitwise operators to check the values stored here, or use isTouching().
* You can even use them broadly as boolean values if you're feeling saucy!
* @property wasTouching
* @type number
* @public
*/
public wasTouching: number;
/**
* Bit field of flags (use with UP, DOWN, LEFT, RIGHT, etc) indicating collision directions.
* Use bitwise operators to check the values stored here.
* Useful for things like one-way platforms (e.g. allowCollisions = UP)
* The accessor "solid" just flips this variable between NONE and ANY.
* @property allowCollisions
* @type number
* @public
*/
public allowCollisions: number;
/**
* Important variable for collision processing.
* Tracks the last location of the Entity. This is set during the time this method 'updates'.
* @property last
* @type Kiwi.Geom.Point
* @public
*/
public last: Kiwi.Geom.Point;
/**
* A boolean to indicate if this object is solid or not.
* @property _solid
* @type boolean
* @private
*/
private _solid: boolean;
/**
* A function that is to execute when this object overlaps with another.
* @property _callbackFunction
* @type Function
* @default null
* @private
*/
private _callbackFunction: any = null;
/**
* The context that the callback method should have when it executes.
* @property _callbackContext
* @type Any
* @private
*/
private _callbackContext: any = null;
/**
* Returns a boolean indicating whether the or not the object is currently colliding on a particular side that is passed.
* Use the collision constants (like LEFT, FLOOR, e.t.c) when passing sides.
* @method isTouching
* @param value [number] The collision constant of the side you want to check against.
* @return {boolean} If the Object is currently colliding on that side or not.
* @public
*/
public isTouching(value: number): boolean {
return (this.touching & value) == value;
}
/**
* Whether the object should collide with other objects or not.
* For more control over what directions the object will collide from, use collision constants (like LEFT, FLOOR, etc)
* and set the value of allowCollisions directly.
* @method solid
* @param [value] {boolean} If left empty, this will then just toggle between ANY and NONE.
* @return {boolean} If Object is currently solid or not.
* @public
*/
public solid(value?: boolean): boolean {
if (value !== undefined) {
if (value)
this.allowCollisions = ArcadePhysics.ANY;
else
this.allowCollisions = ArcadePhysics.NONE;
}
return (this.allowCollisions & ArcadePhysics.ANY) > ArcadePhysics.NONE;
}
/**
* Sets up a callback function that will run when this object overlaps with another.
* When the method is dispatched it will have TWO arguments.
* One - The parent / entity of this ArcadePhysics.
* Two - The GameObject that the collision occured with.
*
* @method setCallback
* @param callbackFunction {Function} The method that is to be executed whe a overlap occurs.
* @param callbackContext {Any} The context that the method is to be called in.
* @public
*/
public setCallback(callbackFunction, callbackContext) {
this._callbackFunction = callbackFunction;
this._callbackContext = callbackContext;
}
/**
* Returns the parent of this entity. Mainly used for executing callbacks.
* @property parent
* @type Kiwi.Entity
* @public
*/
public parent: Kiwi.Entity;
/**
* Sets the parent's rotation to be equal to the trajectory of the
* velocity of the physics component. Note that rotation 0 corresponds
* to pointing directly to the right.
* @method rotateToVelocity
* @return {number} New rotation value
* @public
* @since 1.3.0
*/
public rotateToVelocity (): number {
var result: number = Math.atan2( this.velocity.y, this.velocity.x );
this.transform.rotation = result;
return result;
}
/*
*---------------
* Seperation Code
*---------------
*/
/**
* A static method for seperating two normal GameObjects on both the X and Y Axis's.
* Both objects need to have both an ArcadePhysics Component and a Box component in order for the separate process to succeed.
* This method is not recommended to be directly used but instead use a 'collide/overlaps' method instead.
*
* @method seperate
* @static
* @param object1 {Kiwi.Entity} The first GameObject you would like to seperate.
* @param object2 {Kiwi.Entity} The second GameObject you would like to seperate from the first.
* @return {boolean}
* @public
*/
public static separate(object1: Kiwi.Entity, object2: Kiwi.Entity): boolean {
var separatedX: boolean = this.separateX(object1, object2);
var separatedY: boolean = this.separateY(object1, object2);
return separatedX || separatedY;
}
/**
* Separates two passed GameObjects on the x-axis.
* Both objects need to have both an ArcadePhysics Component and a Box component in order for the separate process to succeed.
* This method is not recommended to be directly used but instead use a 'collide/overlaps' method instead.
*
* @method seperateX
* @param object1 {Kiwi.Entity} The first GameObject.
* @param object2 {Kiwi.Entity} The second GameObject.
* @return {boolean} Whether the objects in fact touched and were separated along the X axis.
* @static
* @public
*/
public static separateX(object1: Kiwi.Entity, object2: Kiwi.Entity): boolean {
//Get the Physics Components.
var phys1: ArcadePhysics = <ArcadePhysics>object1.components.getComponent("ArcadePhysics");
var phys2: ArcadePhysics = <ArcadePhysics>object2.components.getComponent("ArcadePhysics");
//Can they even be sseparatated? two immovable objects
if (phys1.immovable && phys2.immovable)
return false;
//First, get the two object deltas
var overlap: number = 0;
var obj1delta: number = phys1.transform.worldX - phys1.last.x;
var obj2delta: number = phys2.transform.worldX - phys2.last.x;
//Are they the same?
if (obj1delta == obj2delta) return false;
//Check if the X hulls actually overlap
var obj1deltaAbs: number = (obj1delta > 0) ? obj1delta : -obj1delta;
var obj2deltaAbs: number = (obj2delta > 0) ? obj2delta : -obj2delta;
//Get the world hitboxes.
var box1 = phys1.box.worldHitbox;
var box2 = phys2.box.worldHitbox;
//Where they are now using previous y axis's.
var obj1rect: Kiwi.Geom.Rectangle = new Kiwi.Geom.Rectangle(box1.x - ((obj1delta > 0) ? obj1delta : 0), phys1.last.y + phys1.box.hitboxOffset.y, box1.width + ((obj1delta > 0) ? obj1delta : -obj1delta), box1.height);
var obj2rect: Kiwi.Geom.Rectangle = new Kiwi.Geom.Rectangle(box2.x - ((obj2delta > 0) ? obj2delta : 0), phys2.last.y + phys2.box.hitboxOffset.y, box2.width + ((obj2delta > 0) ? obj2delta : -obj2delta), box2.height);
//Could also use Kiwi.Geom.Intersect.rectangleToRectangle here...
if ((obj1rect.x + obj1rect.width > obj2rect.x) && (obj1rect.x < obj2rect.x + obj2rect.width) && (obj1rect.y + obj1rect.height > obj2rect.y) && (obj1rect.y < obj2rect.y + obj2rect.height)) {
var maxOverlap: number = obj1deltaAbs + obj2deltaAbs + ArcadePhysics.OVERLAP_BIAS;
if (obj1delta > obj2delta) {
overlap = box1.x + box1.width - box2.x;
if ((overlap > maxOverlap) || !(phys1.allowCollisions & ArcadePhysics.RIGHT) || !(phys2.allowCollisions & ArcadePhysics.LEFT)) {
overlap = 0;
} else {
phys1.touching |= ArcadePhysics.RIGHT;
phys2.touching |= ArcadePhysics.LEFT;
}
} else {
overlap = box1.x - box2.width - box2.x;
if ((-overlap > maxOverlap) || !(phys1.allowCollisions & ArcadePhysics.LEFT) || !(phys2.allowCollisions & ArcadePhysics.RIGHT)) {
overlap = 0;
} else {
phys1.touching |= ArcadePhysics.LEFT;
phys2.touching |= ArcadePhysics.RIGHT;
}
}
}
if (overlap != 0) {
//Get the average velocity
var obj1v: number = phys1.velocity.x;
var obj2v: number = phys2.velocity.x;
if (!phys1.immovable && !phys2.immovable) {
overlap *= 0.5;
phys1.transform.x = phys1.transform.x - overlap;
phys2.transform.x = phys2.transform.x + overlap;
var obj1velocity: number = Math.sqrt((obj2v * obj2v * phys2.mass) / phys1.mass) * ((obj2v > 0) ? 1 : -1);
var obj2velocity: number = Math.sqrt((obj1v * obj1v * phys1.mass) / phys2.mass) * ((obj1v > 0) ? 1 : -1);
var average: number = (obj1velocity + obj2velocity) * 0.5;
obj1velocity -= average;
obj2velocity -= average;
phys1.velocity.x = average + obj1velocity * phys1.elasticity;
phys2.velocity.x = average + obj2velocity * phys2.elasticity;
} else if (!phys1.immovable) {
phys1.transform.x = phys1.transform.x - overlap;
phys1.velocity.x = obj2v - obj1v * phys1.elasticity;
} else if (!phys2.immovable) {
phys2.transform.x = phys2.transform.x + overlap;
phys2.velocity.x = obj1v - obj2v * phys2.elasticity;
}
return true;
}
return false;
}
/**
* Separates two GameObject on the y-axis. This method is executed from the 'separate' method.
* Both objects need to have both an ArcadePhysics Component and a Box component in order for the separate process to succeed.
* This method is not recommended to be directly used but instead use a 'collide/overlaps' method instead.
*
* @method seperateY
* @param object1 {Kiwi.Entity} The first GameObject.
* @param object2 {Kiwi.Entity} The second GameObject.
* @return {boolean} Whether the objects in fact touched and were separated along the Y axis.
* @static
* @public
*/
public static separateY(object1: Kiwi.Entity, object2: Kiwi.Entity): boolean {
//Get the Arcade Physics Components
var phys1: ArcadePhysics = <ArcadePhysics>object1.components.getComponent("ArcadePhysics");
var phys2: ArcadePhysics = <ArcadePhysics>object2.components.getComponent("ArcadePhysics");
//Can't separate two immovable objects
if (phys1.immovable && phys2.immovable) return false;
var overlap: number = 0;
var obj1delta: number = phys1.transform.worldY - phys1.last.y;
var obj2delta: number = phys2.transform.worldY - phys2.last.y;
//Do the deltas match?
if (obj1delta == obj2delta) return false;
//Absolute Deltas
var obj1deltaAbs: number = (obj1delta > 0) ? obj1delta : -obj1delta;
var obj2deltaAbs: number = (obj2delta > 0) ? obj2delta : -obj2delta;
//Hitboxes
var box1 = phys1.box.worldHitbox;
var box2 = phys2.box.worldHitbox;
//Rectangles
var obj1rect: Kiwi.Geom.Rectangle = new Kiwi.Geom.Rectangle(box1.x, box1.y - ((obj1delta > 0) ? obj1delta : 0), box1.width, box1.height + obj1deltaAbs);
var obj2rect: Kiwi.Geom.Rectangle = new Kiwi.Geom.Rectangle(box2.x, box2.y - ((obj2delta > 0) ? obj2delta : 0), box2.width, box2.height + obj2deltaAbs);
//Check for overlap
if ((obj1rect.x + obj1rect.width > obj2rect.x) && (obj1rect.x < obj2rect.x + obj2rect.width) && (obj1rect.y + obj1rect.height > obj2rect.y) && (obj1rect.y < obj2rect.y + obj2rect.height)) {
var maxOverlap: number = obj1deltaAbs + obj2deltaAbs + ArcadePhysics.OVERLAP_BIAS;
if (obj1delta > obj2delta) {
overlap = box1.y + box1.height - box2.y;
if ((overlap > maxOverlap) || !(phys1.allowCollisions & ArcadePhysics.DOWN) || !(phys2.allowCollisions & ArcadePhysics.UP)) {
overlap = 0;
} else {
phys1.touching |= ArcadePhysics.DOWN;
phys2.touching |= ArcadePhysics.UP;
}
} else {
overlap = box1.y - box2.height - box2.y;
if ((-overlap > maxOverlap) || !(phys1.allowCollisions & ArcadePhysics.UP) || !(phys2.allowCollisions & ArcadePhysics.DOWN)) {
overlap = 0;
} else {
phys1.touching |= ArcadePhysics.UP;
phys2.touching |= ArcadePhysics.DOWN;
}
}
//Then adjust their positions and velocities accordingly (if there was any overlap)
if (overlap != 0) {
var obj1v: number = phys1.velocity.y;
var obj2v: number = phys2.velocity.y;
if (!phys1.immovable && !phys2.immovable) {
overlap *= 0.5;
phys1.transform.y = phys1.transform.y - overlap;
phys2.transform.y = phys2.transform.y + overlap;
var obj1velocity: number = Math.sqrt((obj2v * obj2v * phys2.mass) / phys1.mass) * ((obj2v > 0) ? 1 : -1);
var obj2velocity: number = Math.sqrt((obj1v * obj1v * phys1.mass) / phys2.mass) * ((obj1v > 0) ? 1 : -1);
var average: number = (obj1velocity + obj2velocity) * 0.5;
obj1velocity -= average;
obj2velocity -= average;
phys1.velocity.y = average + obj1velocity * phys1.elasticity;
phys2.velocity.y = average + obj2velocity * phys2.elasticity;
}
else if (!phys1.immovable) {
phys1.transform.y = phys1.transform.y - overlap;
phys1.velocity.y = obj2v - obj1v * phys1.elasticity;
//This is special case code that handles cases like horizontal moving platforms you can ride
if (object2.active && phys2.moves && (obj1delta > obj2delta))
phys1.transform.x = phys1.transform.worldX + object2.transform.worldX - phys2.last.x;
} else if (!phys2.immovable) {
phys2.transform.y = phys2.transform.y + overlap;
phys2.velocity.y = obj1v - obj2v * phys2.elasticity;
//This is special case code that handles cases like horizontal moving platforms you can ride
if (object1.active && phys1.moves && (obj1delta < obj2delta))
phys2.transform.x = phys2.transform.worldX + object1.transform.worldX - phys1.last.x;
}
return true;
}
}
return false;
}
/*
*---------------
* Seperation of Tiles Methods
*---------------
*/