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Controls/Paint/Math/Point.js

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+////////////////////////////////////////////////////////////
+////   © Microsoft. All rights reserved.                ////
+////////////////////////////////////////////////////////////
+
+(function (AppNS) {
+    'use strict';
+
+    // The Point class represents a point in 2-Dimensional space using Cartesian Coordinates.
+    var Point = WinJS.Class.define(
+
+        // Constructor
+        function (x, y) {
+            // The position of the point in 2d space, cartesian coords
+            this.x = x || 0;
+            this.y = y || 0;
+        },
+
+        // Variables and Functions
+        {
+            // Returns the distance between this and another point
+            distanceTo: function (point) {
+                var dx = point.x - this.x;
+                var dy = point.y - this.y;
+                return Math.sqrt(dx * dx + dy * dy);
+            },
+
+            // Creates a Vector pointing from this point to point p
+            createVectorTo: function (point) {
+                return new AppNS.Painter.Math.Vector(point.x - this.x, point.y - this.y);
+            },
+
+            // Sets this point to the result of adding the Vector v to this point
+            add: function (vector) {
+                this.x = this.x + vector.x;
+                this.y = this.y + vector.y;
+            },
+
+            // Sets this point to this point translated by the scaled vector
+            scaleAdd: function (vector, constant) {
+                this.x = this.x + (vector.x * constant);
+                this.y = this.y + (vector.y * constant);
+            },
+
+            // Sets this point to the result of subtracting the Vector v from this point
+            sub: function (vector) {
+                this.x = this.x - vector.x;
+                this.y = this.y - vector.y;
+            },
+
+            // Returns true if this point is the same as p
+            equals: function (point) {
+                return this.x === point.x && this.y === point.y;
+            },
+
+            // Sets this point to the given x and y coords
+            fromXY: function (x, y) {
+                this.x = x;
+                this.y = y;
+            },
+
+            // Sets this point to the given point
+            fromPoint: function (point) {
+                this.x = point.x;
+                this.y = point.y;
+            },
+
+            // Returns a copy of this point
+            copy: function () {
+                return new AppNS.Painter.Math.Point(this.x, this.y);
+            }
+    });
+
+    WinJS.Namespace.defineWithParent(AppNS, "Painter.Math", {
+        Point: Point
+    });
+
+})(Microsoft.Paint);