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https://github.com/photonstorm/phaser
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55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2016 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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/**
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* Creates a rotational spring, connecting two bodies. A spring can have a resting length, a stiffness and damping.
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*
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* @class Phaser.Physics.P2.RotationalSpring
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* @constructor
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* @param {Phaser.Physics.P2} world - A reference to the P2 World.
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* @param {p2.Body} bodyA - First connected body.
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* @param {p2.Body} bodyB - Second connected body.
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* @param {number} [restAngle] - The relative angle of bodies at which the spring is at rest. If not given, it's set to the current relative angle between the bodies.
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* @param {number} [stiffness=100] - Stiffness of the spring. A number >= 0.
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* @param {number} [damping=1] - Damping of the spring. A number >= 0.
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*/
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Phaser.Physics.P2.RotationalSpring = function (world, bodyA, bodyB, restAngle, stiffness, damping) {
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/**
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* @property {Phaser.Game} game - Local reference to game.
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*/
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this.game = world.game;
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/**
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* @property {Phaser.Physics.P2} world - Local reference to P2 World.
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*/
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this.world = world;
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if (restAngle === undefined) { restAngle = null; }
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if (stiffness === undefined) { stiffness = 100; }
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if (damping === undefined) { damping = 1; }
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if (restAngle)
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{
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restAngle = world.pxm(restAngle);
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}
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var options = {
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restAngle: restAngle,
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stiffness: stiffness,
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damping: damping
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};
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/**
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* @property {p2.RotationalSpring} data - The actual p2 spring object.
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*/
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this.data = new p2.RotationalSpring(bodyA, bodyB, options);
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this.data.parent = this;
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};
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Phaser.Physics.P2.Spring.prototype.constructor = Phaser.Physics.P2.Spring;
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