CCPhysicsCollider.js

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 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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var PTM_RATIO = require('../CCPhysicsTypes').PTM_RATIO;
var getWorldScale = require('../utils').getWorldScale;

/**
 * @class PhysicsCollider
 * @extends Collider
 */
var PhysicsCollider = cc.Class({
    name: 'cc.PhysicsCollider',
    extends: cc.Collider,

    ctor: function () {
        this._fixtures = [];
        this._shapes = [];
        this._inited = false;
        this._rect = cc.rect();
    },

    properties: {
        _density: 1.0,
        _sensor: false,
        _friction: 0.2,
        _restitution: 0,
        
        /**
         * !#en
         * The density.
         * !#zh
         * 密度
         * @property {Number} density
         * @default 1
         */
        density: {
            tooltip: CC_DEV && 'i18n:COMPONENT.physics.physics_collider.density',
            get: function () {
                return this._density;
            },
            set: function (value) {
                this._density = value;
            }
        },

        /**
         * !#en
         * A sensor collider collects contact information but never generates a collision response
         * !#zh
         * 一个传感器类型的碰撞体会产生碰撞回调，但是不会发生物理碰撞效果。
         * @property {Boolean} sensor
         * @default false
         */
        sensor: {
            tooltip: CC_DEV && 'i18n:COMPONENT.physics.physics_collider.sensor',        
            get: function () {
                return this._sensor;
            },
            set: function (value) {
                this._sensor  = value;
            }
        },

        /**
         * !#en
         * The friction coefficient, usually in the range [0,1].
         * !#zh
         * 摩擦系数，取值一般在 [0, 1] 之间
         * @property {Number} friction
         * @default 0.2
         */
        friction: {
            tooltip: CC_DEV && 'i18n:COMPONENT.physics.physics_collider.friction',        
            get: function () {
                return this._friction;
            },
            set: function (value) {
                this._friction = value;
            }
        },

        /**
         * !#en
         * The restitution (elasticity) usually in the range [0,1].
         * !#zh
         * 弹性系数，取值一般在 [0, 1]之间
         * @property {Number} restitution
         * @default 0
         */
        restitution: {
            tooltip: CC_DEV && 'i18n:COMPONENT.physics.physics_collider.restitution',
            get: function () {
                return this._restitution;
            },
            set: function (value) {
                this._restitution = value;
            }
        },

        /**
         * !#en
         * Physics collider will find the rigidbody component on the node and set to this property.
         * !#zh
         * 碰撞体会在初始化时查找节点上是否存在刚体，如果查找成功则赋值到这个属性上。
         * @property {RigidBody} body
         * @default null
         */
        body: {
            default: null,
            type: cc.RigidBody,
            visible: false
        }
    },

    onDisable: function () {
        this._destroy();
    },
    onEnable: function () {
        this._init();
    },
    start: function () {
        this._init();
    },

    _getFixtureIndex: function (fixture) {
        return this._fixtures.indexOf(fixture);
    },

    _init: function () {
        cc.director.getPhysicsManager().pushDelayEvent(this, '__init', []);
    },
    _destroy: function () {
        cc.director.getPhysicsManager().pushDelayEvent(this, '__destroy', []);
    },

    __init: function () {
        if (this._inited) return;

        var body = this.body || this.getComponent(cc.RigidBody);
        if (!body) return;

        var innerBody = body._getBody();
        if (!innerBody) return;

        var node = body.node;
        var scale = getWorldScale(node);
        this._scale = scale;

        var shapes = scale.x === 0 && scale.y === 0 ? [] : this._createShape(scale);

        if (!(shapes instanceof Array)) {
            shapes = [shapes];
        }

        var categoryBits = 1 << node.groupIndex;
        var maskBits = 0;
        var bits = cc.game.collisionMatrix[node.groupIndex];
        for (let i = 0; i < bits.length; i++) {
            if (!bits[i]) continue;
            maskBits |= 1 << i;
        }

        var filter = {
            categoryBits: categoryBits,
            maskBits: maskBits,
            groupIndex: 0
        };

        var manager = cc.director.getPhysicsManager();

        for (let i = 0; i < shapes.length; i++) {
            var shape = shapes[i];

            var fixDef = new b2.FixtureDef();
            fixDef.density = this.density;
            fixDef.isSensor = this.sensor;
            fixDef.friction = this.friction;
            fixDef.restitution = this.restitution;
            fixDef.shape = shape;

            fixDef.filter = filter;

            var fixture = innerBody.CreateFixture(fixDef);
            fixture.collider = this;

            if (body.enabledContactListener) {
                manager._registerContactFixture(fixture);
            }

            this._shapes.push(shape);
            this._fixtures.push(fixture);
        }

        this.body = body;

        this._inited = true;
    },

    __destroy: function () {
        if (!this._inited) return;

        var fixtures = this._fixtures;
        var body = this.body._getBody();
        var manager = cc.director.getPhysicsManager();

        for (var i = fixtures.length-1; i >=0 ; i--) {
            var fixture = fixtures[i];
            fixture.collider = null;

            manager._unregisterContactFixture(fixture);

            if (body) {
                body.DestroyFixture(fixture);
            }
        }
        
        this.body = null;
        
        this._fixtures.length = 0;
        this._shapes.length = 0;
        this._inited = false;
    },
    
    _createShape: function () {
    },

    /**
     * !#en
     * Apply current changes to collider, this will regenerate inner box2d fixtures.
     * !#zh
     * 应用当前 collider 中的修改，调用此函数会重新生成内部 box2d 的夹具。
     * @method apply
     */
    apply: function () {
        this._destroy();
        this._init();
    },

    /**
     * !#en
     * Get the world aabb of the collider
     * !#zh
     * 获取碰撞体的世界坐标系下的包围盒
     * @method getAABB
     */
    getAABB: function () {
        var MAX = 10e6;

        var minX = MAX, minY = MAX;
        var maxX = -MAX, maxY = -MAX;
        
        var fixtures = this._fixtures;
        for (var i = 0; i < fixtures.length; i++) {
            var fixture = fixtures[i];

            var count = fixture.GetShape().GetChildCount();
            for (var j = 0; j < count; j++) {
                var aabb = fixture.GetAABB(j);
                if (aabb.lowerBound.x < minX) minX = aabb.lowerBound.x;
                if (aabb.lowerBound.y < minY) minY = aabb.lowerBound.y;
                if (aabb.upperBound.x > maxX) maxX = aabb.upperBound.x;
                if (aabb.upperBound.y > maxY) maxY = aabb.upperBound.y;
            }
        }

        minX *= PTM_RATIO;
        minY *= PTM_RATIO;
        maxX *= PTM_RATIO;
        maxY *= PTM_RATIO;

        var r = this._rect;
        r.x = minX;
        r.y = minY;
        r.width = maxX - minX;
        r.height = maxY - minY;

        return r;
    }
});

cc.PhysicsCollider = module.exports = PhysicsCollider;