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<!DOCTYPE html>
<html lang="en">
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<meta charset="utf-8">
<title>Phaser Source: physics/p2/Body.js</title>
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<h1 class="page-title">Source: physics/p2/Body.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2014 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* The Physics Body is typically linked to a single Sprite and defines properties that determine how the physics body is simulated.
* These properties affect how the body reacts to forces, what forces it generates on itself (to simulate friction), and how it reacts to collisions in the scene.
* In most cases, the properties are used to simulate physical effects. Each body also has its own property values that determine exactly how it reacts to forces and collisions in the scene.
* By default a single Rectangle shape is added to the Body that matches the dimensions of the parent Sprite. See addShape, removeShape, clearShapes to add extra shapes around the Body.
* Note: When bound to a Sprite to avoid single-pixel jitters on mobile devices we strongly recommend using Sprite sizes that are even on both axis, i.e. 128x128 not 127x127.
*
* @class Phaser.Physics.P2.Body
* @classdesc Physics Body Constructor
* @constructor
* @param {Phaser.Game} game - Game reference to the currently running game.
* @param {Phaser.Sprite} [sprite] - The Sprite object this physics body belongs to.
* @param {number} [x=0] - The x coordinate of this Body.
* @param {number} [y=0] - The y coordinate of this Body.
* @param {number} [mass=1] - The default mass of this Body (0 = static).
*/
Phaser.Physics.P2.Body = function (game, sprite, x, y, mass) {
sprite = sprite || null;
x = x || 0;
y = y || 0;
if (typeof mass === 'undefined') { mass = 1; }
/**
* @property {Phaser.Game} game - Local reference to game.
*/
this.game = game;
/**
* @property {Phaser.Physics.P2} world - Local reference to the P2 World.
*/
this.world = game.physics.p2;
/**
* @property {Phaser.Sprite} sprite - Reference to the parent Sprite.
*/
this.sprite = sprite;
/**
* @property {number} type - The type of physics system this body belongs to.
*/
this.type = Phaser.Physics.P2JS;
/**
* @property {Phaser.Point} offset - The offset of the Physics Body from the Sprite x/y position.
*/
this.offset = new Phaser.Point();
/**
* @property {p2.Body} data - The p2 Body data.
* @protected
*/
this.data = new p2.Body({ position: [ this.world.pxmi(x), this.world.pxmi(y) ], mass: mass });
this.data.parent = this;
/**
* @property {Phaser.InversePointProxy} velocity - The velocity of the body. Set velocity.x to a negative value to move to the left, position to the right. velocity.y negative values move up, positive move down.
*/
this.velocity = new Phaser.Physics.P2.InversePointProxy(this.world, this.data.velocity);
/**
* @property {Phaser.InversePointProxy} force - The force applied to the body.
*/
this.force = new Phaser.Physics.P2.InversePointProxy(this.world, this.data.force);
/**
* @property {Phaser.Point} gravity - A locally applied gravity force to the Body. Applied directly before the world step. NOTE: Not currently implemented.
*/
this.gravity = new Phaser.Point();
/**
* Dispatched when the shape/s of this Body impact with another. The event will be sent 2 parameters, this Body and the impact Body.
* @property {Phaser.Signal} onImpact
*/
this.onImpact = new Phaser.Signal();
/**
* Dispatched when a first contact is created between shapes in two bodies. This event is fired during the step, so collision has already taken place.
* The event will be sent 4 parameters: The body it is in contact with, the shape from this body that caused the contact, the shape from the contact body and the contact equation data array.
* @property {Phaser.Signal} onBeginContact
*/
this.onBeginContact = new Phaser.Signal();
/**
* Dispatched when contact ends between shapes in two bodies. This event is fired during the step, so collision has already taken place.
* The event will be sent 3 parameters: The body it is in contact with, the shape from this body that caused the contact and the shape from the contact body.
* @property {Phaser.Signal} onEndContact
*/
this.onEndContact = new Phaser.Signal();
/**
* @property {array} collidesWith - Array of CollisionGroups that this Bodies shapes collide with.
* @private
*/
this.collidesWith = [];
/**
* @property {boolean} removeNextStep - To avoid deleting this body during a physics step, and causing all kinds of problems, set removeNextStep to true to have it removed in the next preUpdate.
*/
this.removeNextStep = false;
this._collideWorldBounds = true;
/**
* @property {object} _bodyCallbacks - Array of Body callbacks.
* @private
*/
this._bodyCallbacks = {};
/**
* @property {object} _bodyCallbackContext - Array of Body callback contexts.
* @private
*/
this._bodyCallbackContext = {};
/**
* @property {object} _groupCallbacks - Array of Group callbacks.
* @private
*/
this._groupCallbacks = {};
/**
* @property {object} _bodyCallbackContext - Array of Grouo callback contexts.
* @private
*/
this._groupCallbackContext = {};
/**
* @property {Phaser.Physics.P2.BodyDebug} debugBody - Reference to the debug body.
*/
this.debugBody = null
// Set-up the default shape
if (sprite)
{
this.setRectangleFromSprite(sprite);
this.game.physics.p2.addBody(this);
}
};
Phaser.Physics.P2.Body.prototype = {
/**
* Sets a callback to be fired any time a shape in this Body impacts with a shape in the given Body. The impact test is performed against body.id values.
* The callback will be sent 4 parameters: This body, the body that impacted, the Shape in this body and the shape in the impacting body.
* Note that the impact event happens after collision resolution, so it cannot be used to prevent a collision from happening.
* It also happens mid-step. So do not destroy a Body during this callback, instead set safeDestroy to true so it will be killed on the next preUpdate.
*
* @method Phaser.Physics.P2.Body#createBodyCallback
* @param {Phaser.Sprite|Phaser.TileSprite|Phaser.Physics.P2.Body|p2.Body} object - The object to send impact events for.
* @param {function} callback - The callback to fire on impact. Set to null to clear a previously set callback.
* @param {object} callbackContext - The context under which the callback will fire.
*/
createBodyCallback: function (object, callback, callbackContext) {
var id = -1;
if (object['id'])
{
id = object.id;
}
else if (object['body'])
{
id = object.body.id;
}
if (id > -1)
{
if (callback === null)
{
delete (this._bodyCallbacks[id]);
delete (this._bodyCallbackContext[id]);
}
else
{
this._bodyCallbacks[id] = callback;
this._bodyCallbackContext[id] = callbackContext;
}
}
},
/**
* Sets a callback to be fired any time this Body impacts with the given Group. The impact test is performed against shape.collisionGroup values.
* The callback will be sent 4 parameters: This body, the body that impacted, the Shape in this body and the shape in the impacting body.
* This callback will only fire if this Body has been assigned a collision group.
* Note that the impact event happens after collision resolution, so it cannot be used to prevent a collision from happening.
* It also happens mid-step. So do not destroy a Body during this callback, instead set safeDestroy to true so it will be killed on the next preUpdate.
*
* @method Phaser.Physics.P2.Body#createGroupCallback
* @param {Phaser.Physics.CollisionGroup} group - The Group to send impact events for.
* @param {function} callback - The callback to fire on impact. Set to null to clear a previously set callback.
* @param {object} callbackContext - The context under which the callback will fire.
*/
createGroupCallback: function (group, callback, callbackContext) {
if (callback === null)
{
delete (this._groupCallbacks[group.mask]);
delete (this._groupCallbacksContext[group.mask]);
}
else
{
this._groupCallbacks[group.mask] = callback;
this._groupCallbackContext[group.mask] = callbackContext;
}
},
/**
* Gets the collision bitmask from the groups this body collides with.
*
* @method Phaser.Physics.P2.Body#getCollisionMask
* @return {number} The bitmask.
*/
getCollisionMask: function () {
var mask = 0;
if (this._collideWorldBounds)
{
mask = this.game.physics.p2.boundsCollisionGroup.mask;
}
for (var i = 0; i < this.collidesWith.length; i++)
{
mask = mask | this.collidesWith[i].mask;
}
return mask;
},
/**
* Updates the collisionMask.
*
* @method Phaser.Physics.P2.Body#updateCollisionMask
* @param {p2.Shape} [shape] - An optional Shape. If not provided the collision group will be added to all Shapes in this Body.
*/
updateCollisionMask: function (shape) {
var mask = this.getCollisionMask();
if (typeof shape === 'undefined')
{
for (var i = this.data.shapes.length - 1; i >= 0; i--)
{
this.data.shapes[i].collisionMask = mask;
}
}
else
{
shape.collisionMask = mask;
}
},
/**
* Sets the given CollisionGroup to be the collision group for all shapes in this Body, unless a shape is specified.
* This also resets the collisionMask.
*
* @method Phaser.Physics.P2.Body#setCollisionGroup
* @param {Phaser.Physics.CollisionGroup} group - The Collision Group that this Bodies shapes will use.
* @param {p2.Shape} [shape] - An optional Shape. If not provided the collision group will be added to all Shapes in this Body.
*/
setCollisionGroup: function (group, shape) {
var mask = this.getCollisionMask();
if (typeof shape === 'undefined')
{
for (var i = this.data.shapes.length - 1; i >= 0; i--)
{
this.data.shapes[i].collisionGroup = group.mask;
this.data.shapes[i].collisionMask = mask;
}
}
else
{
shape.collisionGroup = group.mask;
shape.collisionMask = mask;
}
},
/**
* Clears the collision data from the shapes in this Body. Optionally clears Group and/or Mask.
*
* @method Phaser.Physics.P2.Body#clearCollision
* @param {boolean} [clearGroup=true] - Clear the collisionGroup value from the shape/s?
* @param {boolean} [clearMask=true] - Clear the collisionMask value from the shape/s?
* @param {p2.Shape} [shape] - An optional Shape. If not provided the collision data will be cleared from all Shapes in this Body.
*/
clearCollision: function (clearGroup, clearMask, shape) {
if (typeof shape === 'undefined')
{
for (var i = this.data.shapes.length - 1; i >= 0; i--)
{
if (clearGroup)
{
this.data.shapes[i].collisionGroup = null;
}
if (clearMask)
{
this.data.shapes[i].collisionMask = null;
}
}
}
else
{
if (clearGroup)
{
shape.collisionGroup = null;
}
if (clearMask)
{
shape.collisionMask = null;
}
}
if (clearGroup)
{
this.collidesWith.length = 0;
}
},
/**
* Adds the given CollisionGroup, or array of CollisionGroups, to the list of groups that this body will collide with and updates the collision masks.
*
* @method Phaser.Physics.P2.Body#collides
* @param {Phaser.Physics.CollisionGroup|array} group - The Collision Group or Array of Collision Groups that this Bodies shapes will collide with.
* @param {function} [callback] - Optional callback that will be triggered when this Body impacts with the given Group.
* @param {object} [callbackContext] - The context under which the callback will be called.
* @param {p2.Shape} [shape] - An optional Shape. If not provided the collision mask will be added to all Shapes in this Body.
*/
collides: function (group, callback, callbackContext, shape) {
if (Array.isArray(group))
{
for (var i = 0; i < group.length; i++)
{
if (this.collidesWith.indexOf(group[i]) === -1)
{
this.collidesWith.push(group[i]);
if (callback)
{
this.createGroupCallback(group[i], callback, callbackContext);
}
}
}
}
else
{
if (this.collidesWith.indexOf(group) === -1)
{
this.collidesWith.push(group);
if (callback)
{
this.createGroupCallback(group, callback, callbackContext);
}
}
}
var mask = this.getCollisionMask();
if (typeof shape === 'undefined')
{
for (var i = this.data.shapes.length - 1; i >= 0; i--)
{
this.data.shapes[i].collisionMask = mask;
}
}
else
{
shape.collisionMask = mask;
}
},
/**
* Moves the shape offsets so their center of mass becomes the body center of mass.
*
* @method Phaser.Physics.P2.Body#adjustCenterOfMass
*/
adjustCenterOfMass: function () {
this.data.adjustCenterOfMass();
},
/**
* Apply damping, see http://code.google.com/p/bullet/issues/detail?id=74 for details.
*
* @method Phaser.Physics.P2.Body#applyDamping
* @param {number} dt - Current time step.
*/
applyDamping: function (dt) {
this.data.applyDamping(dt);
},
/**
* Apply force to a world point. This could for example be a point on the RigidBody surface. Applying force this way will add to Body.force and Body.angularForce.
*
* @method Phaser.Physics.P2.Body#applyForce
* @param {number} force - The force to add.
* @param {number} worldX - The world x point to apply the force on.
* @param {number} worldY - The world y point to apply the force on.
*/
applyForce: function (force, worldX, worldY) {
this.data.applyForce(force, [this.world.pxm(worldX), this.world.pxm(worldY)]);
},
/**
* Sets the force on the body to zero.
*
* @method Phaser.Physics.P2.Body#setZeroForce
*/
setZeroForce: function () {
this.data.setZeroForce();
},
/**
* If this Body is dynamic then this will zero its angular velocity.
*
* @method Phaser.Physics.P2.Body#setZeroRotation
*/
setZeroRotation: function () {
this.data.angularVelocity = 0;
},
/**
* If this Body is dynamic then this will zero its velocity on both axis.
*
* @method Phaser.Physics.P2.Body#setZeroVelocity
*/
setZeroVelocity: function () {
this.data.velocity[0] = 0;
this.data.velocity[1] = 0;
},
/**
* Sets the Body damping and angularDamping to zero.
*
* @method Phaser.Physics.P2.Body#setZeroDamping
*/
setZeroDamping: function () {
this.data.damping = 0;
this.data.angularDamping = 0;
},
/**
* Transform a world point to local body frame.
*
* @method Phaser.Physics.P2.Body#toLocalFrame
* @param {Float32Array|Array} out - The vector to store the result in.
* @param {Float32Array|Array} worldPoint - The input world vector.
*/
toLocalFrame: function (out, worldPoint) {
return this.data.toLocalFrame(out, worldPoint);
},
/**
* Transform a local point to world frame.