phaser/todo/TS Source/physics/circle/ProjCircleConcave.js

var Phaser;
(function (Phaser) {
    (function (Physics) {
        /// <reference path="../../_definitions.ts" />
        /**
        * Phaser - Physics - Projection
        */
        (function (Projection) {
            var CircleConcave = (function () {
                function CircleConcave() { }
                CircleConcave.Collide = function Collide(x, y, oH, oV, obj, t) {
                    //if we're colliding diagonally:
                    //	-if obj is in the diagonal pointed to by the slope normal: we can't collide, do nothing
                    //  -else, collide vs. the appropriate vertex
                    //if obj is in this tile: perform collision as for aabb
                    //if obj is horiz OR very neighb in direction of slope: collide vs vert
                    //if obj is horiz or vert neigh against direction of slope: collide vs. face
                    var signx = t.signx;
                    var signy = t.signy;
                    var lenP;
                    if(oH == 0) {
                        if(oV == 0) {
                            //colliding with current tile
                            var ox = (t.pos.x + (signx * t.xw)) - obj.pos.x;//(ox,oy) is the vector from the circle to
                            
                            var oy = (t.pos.y + (signy * t.yw)) - obj.pos.y;//tile-circle's center
                            
                            var twid = t.xw * 2;
                            var trad = Math.sqrt(twid * twid + 0);//this gives us the radius of a circle centered on the tile's corner and extending to the opposite edge of the tile;
                            
                            //note that this should be precomputed at compile-time since it's constant
                            var len = Math.sqrt(ox * ox + oy * oy);
                            var pen = (len + obj.radius) - trad;
                            if(0 < pen) {
                                //find the smallest axial projection vector
                                if(x < y) {
                                    //penetration in x is smaller
                                    lenP = x;
                                    y = 0;
                                    //get sign for projection along x-axis
                                    if((obj.pos.x - t.pos.x) < 0) {
                                        x *= -1;
                                    }
                                } else {
                                    //penetration in y is smaller
                                    lenP = y;
                                    x = 0;
                                    //get sign for projection along y-axis
                                    if((obj.pos.y - t.pos.y) < 0) {
                                        y *= -1;
                                    }
                                }
                                if(lenP < pen) {
                                    obj.reportCollisionVsWorld(x, y, x / lenP, y / lenP, t);
                                    return Phaser.Physics.Circle.COL_AXIS;
                                } else {
                                    //we can assume that len >0, because if we're here then
                                    //(len + obj.radius) > trad, and since obj.radius <= trad
                                    //len MUST be > 0
                                    ox /= len;
                                    oy /= len;
                                    obj.reportCollisionVsWorld(ox * pen, oy * pen, ox, oy, t);
                                    return Phaser.Physics.Circle.COL_OTHER;
                                }
                            } else {
                                return Phaser.Physics.Circle.COL_NONE;
                            }
                        } else {
                            //colliding vertically
                            if((signy * oV) < 0) {
                                //colliding with face/edge
                                obj.reportCollisionVsWorld(0, y * oV, 0, oV, t);
                                return Phaser.Physics.Circle.COL_AXIS;
                            } else {
                                //we could only be colliding vs the vertical tip
                                //get diag vertex position
                                var vx = t.pos.x - (signx * t.xw);
                                var vy = t.pos.y + (oV * t.yw);
                                var dx = obj.pos.x - vx;//calc vert->circle vector
                                
                                var dy = obj.pos.y - vy;
                                var len = Math.sqrt(dx * dx + dy * dy);
                                var pen = obj.radius - len;
                                if(0 < pen) {
                                    //vertex is in the circle; project outward
                                    if(len == 0) {
                                        //project out vertically
                                        dx = 0;
                                        dy = oV;
                                    } else {
                                        dx /= len;
                                        dy /= len;
                                    }
                                    obj.reportCollisionVsWorld(dx * pen, dy * pen, dx, dy, t);
                                    return Phaser.Physics.Circle.COL_OTHER;
                                }
                            }
                        }
                    } else if(oV == 0) {
                        //colliding horizontally
                        if((signx * oH) < 0) {
                            //colliding with face/edge
                            obj.reportCollisionVsWorld(x * oH, 0, oH, 0, t);
                            return Phaser.Physics.Circle.COL_AXIS;
                        } else {
                            //we could only be colliding vs the horizontal tip
                            //get diag vertex position
                            var vx = t.pos.x + (oH * t.xw);
                            var vy = t.pos.y - (signy * t.yw);
                            var dx = obj.pos.x - vx;//calc vert->circle vector
                            
                            var dy = obj.pos.y - vy;
                            var len = Math.sqrt(dx * dx + dy * dy);
                            var pen = obj.radius - len;
                            if(0 < pen) {
                                //vertex is in the circle; project outward
                                if(len == 0) {
                                    //project out horizontally
                                    dx = oH;
                                    dy = 0;
                                } else {
                                    dx /= len;
                                    dy /= len;
                                }
                                obj.reportCollisionVsWorld(dx * pen, dy * pen, dx, dy, t);
                                return Phaser.Physics.Circle.COL_OTHER;
                            }
                        }
                    } else {
                        //colliding diagonally
                        if(0 < ((signx * oH) + (signy * oV))) {
                            //the dotprod of slope normal and cell offset is strictly positive,
                            //therefore obj is in the diagonal neighb pointed at by the normal, and
                            //it cannot possibly reach/touch/penetrate the slope
                            return Phaser.Physics.Circle.COL_NONE;
                        } else {
                            //collide vs. vertex
                            //get diag vertex position
                            var vx = t.pos.x + (oH * t.xw);
                            var vy = t.pos.y + (oV * t.yw);
                            var dx = obj.pos.x - vx;//calc vert->circle vector
                            
                            var dy = obj.pos.y - vy;
                            var len = Math.sqrt(dx * dx + dy * dy);
                            var pen = obj.radius - len;
                            if(0 < pen) {
                                //vertex is in the circle; project outward
                                if(len == 0) {
                                    //project out by 45deg
                                    dx = oH / Math.SQRT2;
                                    dy = oV / Math.SQRT2;
                                } else {
                                    dx /= len;
                                    dy /= len;
                                }
                                obj.reportCollisionVsWorld(dx * pen, dy * pen, dx, dy, t);
                                return Phaser.Physics.Circle.COL_OTHER;
                            }
                        }
                    }
                    return Phaser.Physics.Circle.COL_NONE;
                };
                return CircleConcave;
            })();
            Projection.CircleConcave = CircleConcave;            
        })(Physics.Projection || (Physics.Projection = {}));
        var Projection = Physics.Projection;
    })(Phaser.Physics || (Phaser.Physics = {}));
    var Physics = Phaser.Physics;
})(Phaser || (Phaser = {}));