1 files changed, 150 insertions, 0 deletions

diff --git a/js/helper-classes/RDGE/GLAnchorPoint.js b/js/helper-classes/RDGE/GLAnchorPoint.js
new file mode 100644
index 00000000..496b6f60
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+++ b/js/helper-classes/RDGE/GLAnchorPoint.js
@@ -0,0 +1,150 @@
+/* <copyright>
+This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
+No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
+(c) Copyright 2011 Motorola Mobility, Inc.  All Rights Reserved.
+</copyright> */
+
+/////////////////////////////////////////////
+// Class GLAnchorPoint
+//      GL representation of a point clicked 
+//          and dragged during pen tool
+//      
+//    
+/////////////////////////////////////////////
+function GLAnchorPoint() {
+    /////////////////////////////////////////
+    // Instance variables 
+    /////////////////////////////////////////
+    this._x = 0.0;
+    this._y = 0.0;
+    this._z = 0.0;
+
+    this._prevX = 0.0;
+    this._prevY = 0.0;
+    this._prevZ = 0.0;
+
+    this._nextX = 0.0;
+    this._nextY = 0.0;
+    this._nextZ = 0.0;
+
+    // *********** setters ************
+    this.setPos = function (x, y, z) { this._x = x; this._y = y; this._z = z; }
+    this.setPrevPos = function (x, y, z) { this._prevX = x; this._prevY = y; this._prevZ = z; }
+    this.setNextPos = function (x, y, z) { this._nextX = x; this._nextY = y; this._nextZ = z; }
+
+    this.setPrevFromNext = function () {
+        //set the previous control point by reflecting the next control point
+        var dispX = this._nextX - this._x;
+        var dispY = this._nextY - this._y;
+        var dispZ = this._nextZ - this._z;
+
+        this._prevX = this._x - dispX;
+        this._prevY = this._y - dispY;
+        this._prevZ = this._z - dispZ;
+    }
+    this.setNextFromPrev = function () {
+        //set the previous control point by reflecting the next control point
+        var dispX = this._prevX - this._x;
+        var dispY = this._prevY - this._y;
+        var dispZ = this._prevZ - this._z;
+
+        this._nextX = this._x - dispX;
+        this._nextY = this._y - dispY;
+        this._nextZ = this._z - dispZ;
+    }
+
+    //translate the next point from the translation that was applied to the prev. point
+    this.translateNextFromPrev = function (tx, ty, tz) {
+        // *** compute the rotation of the prev vector ***
+        var oldP = Vector.create([this._prevX + tx - this._x, this._prevY + ty - this._y, this._prevZ + tz - this._z]);
+        var newP = Vector.create([this._prevX - this._x, this._prevY - this._y, this._prevZ - this._z]);
+        //compute angle between the two vectors
+        var axis = Vector.create([0, 0, 0]);
+        var angle = MathUtils.getAxisAngleBetween3DVectors(oldP, newP, axis);
+        if (angle === 0)
+            return;
+
+        // *** compute the vector from anchor to next
+        var oldN = Vector.create([this._nextX - this._x, this._nextY - this._y, this._nextZ - this._z]);
+        var rotMat = Matrix.Rotation(-angle, axis);
+        var newN = MathUtils.transformVector(oldN, rotMat);
+
+        //TEMP for some situations the axis angle computation returns NaNs
+        if (isNaN(newN[0]) || isNaN(newN[1]) || isNaN(newN[2])) {
+            return;
+        }
+        //end TEMP
+        this._nextX = this._x + newN[0];
+        this._nextY = this._y + newN[1];
+        this._nextZ = this._z + newN[2];
+    }
+    //translate the next point from the translation that was applied to the prev. point
+    this.translatePrevFromNext = function (tx, ty, tz) {
+        // *** compute the rotation of the next vector ***
+        var oldN = Vector.create([this._nextX + tx - this._x, this._nextY + ty - this._y, this._nextZ + tz - this._z]);
+        var newN = Vector.create([this._nextX - this._x, this._nextY - this._y, this._nextZ - this._z]);
+        //compute angle between the two vectors
+        var axis = Vector.create([0, 0, 0]);
+        var angle = MathUtils.getAxisAngleBetween3DVectors(oldN, newN, axis);
+        if (angle === 0)
+            return;
+
+        // *** compute the vector from anchor to prev
+        var oldP = Vector.create([this._prevX - this._x, this._prevY - this._y, this._prevZ - this._z]);
+        var rotMat = Matrix.Rotation(-angle, axis);
+        var newP = MathUtils.transformVector(oldP, rotMat);
+
+        //TEMP for some situations the axis angle computation returns NaNs
+        if (isNaN(newP[0]) || isNaN(newP[1]) || isNaN(newP[2])) {
+            return;
+        }
+        //end TEMP
+        this._prevX = this._x + newP[0];
+        this._prevY = this._y + newP[1];
+        this._prevZ = this._z + newP[2];
+    }
+
+
+    // ******* modifiers *******
+    this.translatePrev = function (x, y, z) {
+        this._prevX += x; this._prevY += y; this._prevZ += z; 
+    }
+    this.translateNext = function (x, y, z) {
+        this._nextX += x; this._nextY += y; this._nextZ += z;
+    }
+    this.translate = function (x, y, z) {
+        this._x += x; this._y += y; this._z += z;
+    }
+    this.translateAll = function (x, y, z) {
+        this.translate(x, y, z);
+        this.translatePrev(x, y, z);
+        this.translateNext(x, y, z);
+    }
+    
+    
+    // ********* getters **********
+    this.getPosX = function () { return this._x; }
+    this.getPosY = function () { return this._y; }
+    this.getPosZ = function () { return this._z; }
+    this.getPrevX = function () { return this._prevX; }
+    this.getPrevY = function () { return this._prevY; }
+    this.getPrevZ = function () { return this._prevZ; }
+    this.getNextX = function () { return this._nextX; }
+    this.getNextY = function () { return this._nextY; }
+    this.getNextZ = function () { return this._nextZ; }
+    this.getPos = function() { return Vector.create([this._x, this._y, this._z]);}
+    this.getPrev = function() { return Vector.create([this._prevX, this._prevY, this._prevZ]);}
+    this.getNext = function() { return Vector.create([this._nextX, this._nextY, this._nextZ]);}
+    //return the square of distance from passed in point to the anchor position
+    this.getDistanceSq = function (x, y, z) {
+        return (this._x - x) * (this._x - x) + (this._y - y) * (this._y - y) + (this._z - z) * (this._z - z);
+    }
+    //return sq. of distance to prev. 
+    this.getPrevDistanceSq = function (x, y, z) {
+        return (this._prevX - x) * (this._prevX - x) + (this._prevY - y) * (this._prevY - y) + (this._prevZ - z) * (this._prevZ - z);
+    }
+    //return sq. of distance to next 
+    this.getNextDistanceSq = function (x, y, z) {
+        return (this._nextX - x) * (this._nextX - x) + (this._nextY - y) * (this._nextY - y) + (this._nextZ - z) * (this._nextZ - z);
+    }
+}