3957     add: function (that) {  argument
3958       return new Point(this.x + that.x, this.y + that.y);
3966     addEquals: function (that) {  argument
3967       this.x += that.x;
3968       this.y += that.y;
3997     subtract: function (that) {  argument
3998       return new Point(this.x - that.x, this.y - that.y);
4006     subtractEquals: function (that) {  argument
4007       this.x -= that.x;
4008       this.y -= that.y;
4077     eq: function (that) {  argument
4078       return (this.x === that.x && this.y === that.y);
4086     lt: function (that) {  argument
4087       return (this.x < that.x && this.y < that.y);
4095     lte: function (that) {  argument
4096       return (this.x <= that.x && this.y <= that.y);
4105     gt: function (that) {  argument
4106       return (this.x > that.x && this.y > that.y);
4114     gte: function (that) {  argument
4115       return (this.x >= that.x && this.y >= that.y);
4124     lerp: function (that, t) {  argument
4125       return new Point(this.x + (that.x - this.x) * t, this.y + (that.y - this.y) * t);
4133     distanceFrom: function (that) {  argument
4134       var dx = this.x - that.x,
4135           dy = this.y - that.y;
4144     midPointFrom: function (that) {  argument
4145       return new Point(this.x + (that.x - this.x)/2, this.y + (that.y - this.y)/2);
4153     min: function (that) {  argument
4154       return new Point(Math.min(this.x, that.x), Math.min(this.y, that.y));
4162     max: function (that) {  argument
4163       return new Point(Math.max(this.x, that.x), Math.max(this.y, that.y));
4188     setFromPoint: function (that) {  argument
4189       this.x = that.x;
4190       this.y = that.y;
4197     swap: function (that) {  argument
4200       this.x = that.x;
4201       this.y = that.y;
4202       that.x = x;
4203       that.y = y;