CCWeldJoint.js

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var PTM_RATIO = require('../CCPhysicsTypes').PTM_RATIO;
var ANGLE_TO_PHYSICS_ANGLE = require('../CCPhysicsTypes').ANGLE_TO_PHYSICS_ANGLE;

/**
 * !#en
 * A weld joint essentially glues two bodies together. A weld joint may
 * distort somewhat because the island constraint solver is approximate.
 * !#zh
 * 熔接关节相当于将两个刚体粘在了一起。
 * 熔接关节可能会使某些东西失真，因为约束求解器算出的都是近似值。
 * @class WeldJoint
 * @extends Joint
 */
var WeldJoint = cc.Class({
    name: 'cc.WeldJoint',
    extends: cc.Joint,
    
    editor: CC_EDITOR && {
        inspector: 'packages://inspector/inspectors/comps/physics/joint.js',
        menu: 'i18n:MAIN_MENU.component.physics/Joint/Weld',
    },

    properties: {
        /**
         * !#en
         * The reference angle.
         * !#zh
         * 相对角度。
         * @property {Number} referenceAngle
         * @default 0
         */
        referenceAngle: {
            default: 0,
            tooltip: CC_DEV && 'i18n:COMPONENT.physics.physics_collider.referenceAngle'            
        },

        _frequency: 0,
        _dampingRatio: 0,

        /**
         * !#en
         * The frequency.
         * !#zh
         * 弹性系数。
         * @property {Number} frequency
         * @default 0
         */
        frequency: {
            tooltip: CC_DEV && 'i18n:COMPONENT.physics.physics_collider.frequency',
            get: function () {
                return this._frequency;
            },
            set: function (value) {
                this._frequency = value;
                if (this._joint) {
                    this._joint.SetFrequency(value);
                }
            }
        },

        /**
         * !#en
         * The damping ratio.
         * !#zh
         * 阻尼，表示关节变形后，恢复到初始状态受到的阻力。
         * @property {Number} dampingRatio
         * @property 0
         */
        dampingRatio: {
            tooltip: CC_DEV && 'i18n:COMPONENT.physics.physics_collider.dampingRatio',            
            get: function () {
                return this._dampingRatio;
            },
            set: function (value) {
                this._dampingRatio = value;
                if (this._joint) {
                    this._joint.SetDampingRatio(value);
                }
            }
        }
    },

    _createJointDef: function () {
        var def = new b2.WeldJointDef();
        def.localAnchorA = new b2.Vec2(this.anchor.x/PTM_RATIO, this.anchor.y/PTM_RATIO);
        def.localAnchorB = new b2.Vec2(this.connectedAnchor.x/PTM_RATIO, this.connectedAnchor.y/PTM_RATIO);
        def.referenceAngle = this.referenceAngle * ANGLE_TO_PHYSICS_ANGLE;

        def.frequencyHz = this.frequency;
        def.dampingRatio = this.dampingRatio;

        return def;
    }
});

cc.WeldJoint = module.exports = WeldJoint;