/* <copyright>
Copyright (c) 2012, Motorola Mobility LLC.
All Rights Reserved.

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modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.

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  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

* Neither the name of Motorola Mobility LLC nor the names of its
  contributors may be used to endorse or promote products derived from this
  software without specific prior written permission.

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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</copyright> */

/* Base class for the 3D rotation tools
Subclass RotateObject3DTool will rotate the object that was clicked.
Subclass RotateStage3DTool will rotate the stage.
 */
var Montage = require("montage/core/core").Montage,
    ModifierToolBase = require("js/tools/modifier-tool-base").ModifierToolBase,
    snapManager = require("js/helper-classes/3D/snap-manager").SnapManager,
    viewUtils = require("js/helper-classes/3D/view-utils").ViewUtils,
    vecUtils = require("js/helper-classes/3D/vec-utils").VecUtils,
    drawUtils = require("js/helper-classes/3D/draw-utils").DrawUtils,
    ElementsMediator = require("js/mediators/element-mediator").ElementMediator;

exports.Rotate3DToolBase = Montage.create(ModifierToolBase, {
    _canSnap: { value: false },

    _inLocalMode: { value: true, enumerable: true },

    rotateStage: {
        value: false
    },

    initializeSnapping : {
        value : function(event)
        {
//            console.log( "initializeSnapping" );

            var selectedElements = this.application.ninja.selectedElements;
            if(this.rotateStage) {
                selectedElements = [this.application.ninja.currentDocument.model.documentRoot];
            }

            this._mouseDownHitRec = null;
            this._mouseUpHitRec   = null;

            snapManager.clearAvoidList();
            snapManager.clearDragPlane();

            // the translate tool does snap align to the bounds of the object only.
            // turn off snap align to the cursor.  This needs to be re-enabled in the mouse up method
            snapManager.enableSnapAlign( false );

            // snap to element and snap to grid are conditionally enabled based
            // on the snap results of the mouse down.  enable everything for the first snap
            this._snapToElements = snapManager.elementSnapEnabledAppLevel();
            this._snapToGrid = snapManager.gridSnapEnabledAppLevel();

            this._dragPlane = null;
            this._clickedOnStage = false;
            var do3DSnap = true;

            if(this._handleMode === null)
            {
                snapManager.enableElementSnap   ( true  );
                snapManager.enableGridSnap      ( true  );
            }
//            else
//            {
//                this._delta = null;
                // special case for z-translation
//                if(this._handleMode === 0)
//                {
//                    this._dragPlane = viewUtils.getNormalToUnprojectedElementPlane(this._target);
//                    snapManager.setupDragPlaneFromPlane(this._dragPlane);
//                    do3DSnap = false;

//                    snapManager.enableElementSnap ( false );
//                    snapManager.enableGridSnap        ( false );
//                }
//            }

            if (selectedElements.length)
            {
                var point = webkitConvertPointFromPageToNode(this.application.ninja.stage.canvas,
                                                                new WebKitPoint(event.pageX, event.pageY));

                // do the snap before setting up the avoid list to allow
                // a snap on the mouse down
                var hitRec = snapManager.snap(point.x, point.y, do3DSnap);

//                if(this._handleMode === 2)
//                {
//                    // translate z doesn't snap to element so hitRec's element will always be different
//                    // from what the browser says we clicked on. So, skip this check.
//                }
//                else
//                {
//                    // Check that hitRec's element matches element that browser says we clicked on
//                    // TODO - This is still not working when using a handle that is on top of an
//                    // element that is not currently selected
//                    var elt = this.application.ninja.stage.GetSelectableElement(event);
//                    if(elt && (elt !== hitRec.getElement()))
//                    {
//                        hitRec = snapManager.findHitRecordForElement(elt);
//                    }
//                    if(elt === this.application.ninja.currentDocument.model.domContainer)
//                    {
//                        this._clickedOnStage = true;
//                    }
//                }

                // we don't want to snap to selected objects during the drag
//                var len = this._targets.length;
//                for(var i=0; i<len; i++)
//                {
//                    snapManager.addToAvoidList( this._targets[i].elt );
//                }
                if (hitRec)
                {
                    // disable snap attributes
                    if (hitRec.getType() == hitRec.SNAP_TYPE_ELEMENT)
                    {
                        this._snapToElements = false;
                        this._snapToGrid = false;
                    }
                    else if (hitRec.getType() == hitRec.SNAP_TYPE_ELEMENT_CENTER)
                    {
                        snapManager.enableSnapAlign( snapManager.snapAlignEnabledAppLevel() );
                    }

                    if(this._handleMode === 0)
                        this.clickedObject = this._target;

                    // parameterize the snap point on the target
                    this._snapParam = this.parameterizeSnap( hitRec );

                    if(!this._dragPlane)
                    {
                        if (selectedElements.length === 1)
                        {
                            this._dragPlane = viewUtils.getUnprojectedElementPlane(this._clickedObject);
                            snapManager.setupDragPlaneFromPlane(this._dragPlane);
                        }
                        else
                        {
                            this._dragPlane = snapManager.setupDragPlanes( hitRec, true );
                        }

                    }

                    // no quadrant snapping for the rotate tool
                    this._shouldUseQuadPt = false;

                    var wpHitRec = hitRec.convertToWorkingPlane( this._dragPlane );
                    this._mouseDownHitRec = wpHitRec;
                    this._mouseUpHitRec = null;

                    var pt = hitRec.getScreenPoint();
                    this.downPoint.x = pt[0];
                    this.downPoint.y = pt[1];
                    this.downPoint.z = pt[2];

                    // TODO - need to figure out snapManager dependency by drawUtils.
                    // For now, bypassing by calling snapManager.drawLastHit();
//                  drawUtils.refreshDisplay();
//                    snapManager.drawLastHit();
                }
            }
            else
            {
                this.target = null;
            }
        }
    },

    drawWithoutSnapping:
    {
        value: function(event)
        {
            if(this._handleMode !== null)
            {
                this._matL = this._handles[this._handleMode]._matL.slice(0);
                this._planeEq = this._handles[this._handleMode]._planeEq.slice(0);
                this._dirVecL = this._handles[this._handleMode]._dirVecL.slice(0);
                this._startPoint = MathUtils.getLocalPoint(this.downPoint.x,
                                                            this.downPoint.y,
                                                            this._planeEq,
                                                            this._matL);
                if(!this._startPoint)
                {
                    this._startPoint = [this.downPoint.x, this.downPoint.y];
                }
            }
        }
    },

    HandleMouseMove: {
        value: function(event) {
            if(this._escape) {
                this._escape = false;
                this.isDrawing = true;
            }

            if(this.isDrawing) {
                this._hasDraw = true;   // Flag for position of element
                this.doDraw(event);
            } else {
                this._showFeedbackOnMouseMove(event);
                if(this._canSnap)
                {
                    this.doSnap(event);
                }
            }

            this.DrawHandles(this._delta);

            if(this._canSnap)
            {
                snapManager.drawLastHit();
            }
        }
    },

    modifyElements: {
        value: function(data, event) {
            var mat,
                angle,
                f,
                pt0 = data.pt0,
                pt1 = data.pt1;

            var selectedElements = this.application.ninja.selectedElements;
            if(this.rotateStage) {
                selectedElements = [this.application.ninja.currentDocument.model.documentRoot];
            }

            if(this._handleMode !== null)
            {
                if(this._activateOriginHandle)
                {
                    // move the transform origin handle directly to the snap point (pt1)
                    this._origin[0] = pt1.x;
                    this._origin[1] = pt1.y;
                    this._origin[2] = pt1.z;

                    var sw2gMat = viewUtils.getStageWorldToGlobalMatrix();
                    var g2swMat = glmat4.inverse( sw2gMat, [] );
                    var swOrigin = MathUtils.transformAndDivideHomogeneousPoint( this._origin, g2swMat );
                    //console.log( "modifyElements, _origin: " + this._origin + ", in stageWorld: " + swOrigin );

                    var len = selectedElements.length;
                    if(len === 1)
                    {
                        var elt = selectedElements[0];
                        var g2lMat = elt.elementModel.getProperty("g2l");
                        var localOrigin = MathUtils.transformAndDivideHomogeneousPoint( this._origin, g2lMat );

                        viewUtils.pushViewportObj( elt );
                        var viewOrigin = viewUtils.screenToView( localOrigin[0], localOrigin[1], localOrigin[2] );
                        viewUtils.popViewportObj();
                        this._startOriginArray[0] = viewOrigin;
                        //console.log( "Rotate3DToolBase.modifyElements, _startOriginArray[0]: " + this._startOriginArray[0] );
                    }

                    this.downPoint.x = pt1.x;
                    this.downPoint.y = pt1.y;
                    this.downPoint.z = pt1.z;
                    this.DrawHandles();
                    return;
                }

                angle = this._getAngleToRotate(pt1.x, pt1.y);
                if(event.shiftKey)
                {
                    f = Math.floor(angle/(Math.PI/4));
                    angle = f*Math.PI/4;
                }
                this._delta = angle;
                switch(this._handleMode)
                {
                    case 0:
                        // Rotate X;
                        mat = Matrix.RotationX(angle);
                        break;
                    case 1:
                        // Rotate Y
                        mat = Matrix.RotationY(angle);
                        break;
                    case 2:
                        // Rotate Z
                        mat = Matrix.RotationZ(angle);
                        break;
                    default:
                        break;
                }
            }
            else
            {
                if (event.ctrlKey || event.metaKey)
                {
                    var zAngle = this._mouseSpeed * (pt1.y - this.downPoint.y) * Math.PI / 180.0;
                    if (zAngle === 0)
                    {
                        zAngle = 0.01 * Math.PI / 180.0;
                    }
                    if(event.shiftKey)
                    {
                        f = Math.floor(zAngle/(Math.PI/4));
                        zAngle = f*Math.PI/4;
                    }
                    mat = Matrix.RotationZ(zAngle);
                }
                else
                {
                    var yAngle = this._mouseSpeed * (pt1.x - this.downPoint.x) * Math.PI / 180.0;
                    var xAngle = -this._mouseSpeed * (pt1.y - this.downPoint.y) * Math.PI / 180.0;
                    if(event.shiftKey)
                    {
                        f = Math.floor(yAngle/(Math.PI/4));
                        yAngle = f*Math.PI/4;
                        f = Math.floor(xAngle/(Math.PI/4));
                        xAngle = f*Math.PI/4;
                    }

                    // check the orientation of the X axis
                    //if (drawUtils.drawYZ)  xAngle = -xAngle;
                    var yMat  = Matrix.RotationY( yAngle ),
                        xMat  = Matrix.RotationX( xAngle );

                    mat = glmat4.multiply(yMat, xMat, []);
                }
            }

            if(this._inLocalMode && (this.application.ninja.selectedElements.length === 1 || this.rotateStage) )
            {
//              console.log( "modifyElements: rotateLocally " );
                this._rotateLocally(mat);
            }
            else
            {
                this._rotateGlobally(mat);
            }

//            this.UpdateSelection();
            NJevent("elementChanging", {type : "Changing", redraw: false});
        }
    },

    _rotateLocally: {
        value: function (rotMat) {
            var selectedElements = this.application.ninja.selectedElements;

            if(this.rotateStage) {
                selectedElements = [this.application.ninja.currentDocument.model.documentRoot];
            }
            var len = selectedElements.length;
            for(var i = 0; i < len; i++) {
                var elt = selectedElements[i];
                var curMat = elt.elementModel.getProperty("mat");

                // pre-translate by the transformation center
                var tMat = Matrix.I(4);

                // _startOriginArray is the location of the center of rotation
                // in view space of the element.
                var transformCtr = this._startOriginArray[i];

                tMat[12] = transformCtr[0];
                tMat[13] = transformCtr[1];
                tMat[14] = transformCtr[2];

                var mat = glmat4.multiply(curMat, tMat, []);

                // translate back
                tMat[12] = -transformCtr[0];
                tMat[13] = -transformCtr[1];
                tMat[14] = -transformCtr[2];

                glmat4.multiply(mat, rotMat, mat);


                glmat4.multiply(mat, tMat, mat);

                // while moving, set inline style to improve performance
                viewUtils.setMatrixForElement( elt, mat, true );
            }
        }
    },

    _rotateGlobally: {
        value: function (rotMat) {
            var len = this.application.ninja.selectedElements.length;
            for(var i = 0; i < len; i++) {
                var elt = this.application.ninja.selectedElements[i].elementModel.getProperty("elt");
                var curMat = this.application.ninja.selectedElements[i].elementModel.getProperty("mat");

                // pre-translate by the transformation center
                var tMat = Matrix.I(4);

                var transformCtr = this._startOriginArray[i].slice(0);
                transformCtr = MathUtils.transformPoint(transformCtr, curMat);

//              console.log( "modifyElements: rotateGlobally, ctr: " + transformCtr );

                tMat[12] = transformCtr[0];
                tMat[13] = transformCtr[1];
                tMat[14] = transformCtr[2];

                var mat = glmat4.multiply(tMat, rotMat, []);

                // translate back
                tMat[12] = -transformCtr[0];
                tMat[13] = -transformCtr[1];
                tMat[14] = -transformCtr[2];

                glmat4.multiply(mat, tMat, mat);

                glmat4.multiply(mat, curMat, mat);

                viewUtils.setMatrixForElement(this.application.ninja.selectedElements[i], mat, true );
            }
        }
    },

    _getAngleToRotate: {
        value: function (x, y) {
            var angle;
            var pt = MathUtils.getLocalPoint(x, y, this._planeEq, this._matL);
            if(!pt)
            {
                //TODO - should this be _startPoint.x/y instead of downPoint.x/y?
                var st = [this.downPoint.x, this.downPoint.y];
                pt = [x, y];
                var sub = vecUtils.vecSubtract(2, pt, st);
                var dot = vecUtils.vecDot(2, sub, this._dirVecL);

                angle = vecUtils.vecDist(2, pt, st) * 0.1;

                if (dot < 0)
                {
                    angle = -angle;
                }
            }
            else
            {
                angle = MathUtils.getAngleBetweenPoints(this._startPoint, pt);
            }
            return angle;
        }
    },

    captureSelectionChange: {
        value: function(event){
            this.eventManager.addEventListener("selectionDrawn", this, true);
        }
    },

    captureSelectionDrawn: {
        value: function(event){
            this._origin = null;
            this._startOriginArray = null;

            var len = this.application.ninja.selectedElements.length;
            if(len)
            {
                if(len === 1)
                {
                    this.target = this.application.ninja.selectedElements[0];

                    viewUtils.pushViewportObj( this.target );
                    var eltCtr = viewUtils.getCenterOfProjection();
                    eltCtr[2] = 0;
                    viewUtils.popViewportObj();

                    var ctrOffset = this.target.elementModel.props3D.m_transformCtr;
                    if(ctrOffset)
                    {
                        eltCtr[2] = 0;
                        eltCtr = vecUtils.vecAdd(3, eltCtr, ctrOffset);
                    }

                    this._origin = viewUtils.localToGlobal(eltCtr, this.target);
                    //console.log( "Rotate3DToolBase.captureSelectionDrawn _origin: " + this._origin );
                    this._updateTargets();
                    this._setTransformOrigin(false);
                }
                else
                {
                    this.target = this.application.ninja.currentDocument.model.documentRoot;
                    //this._origin = drawUtils._selectionCtr.slice(0);
                    //this._origin[0] += this.application.ninja.stage.userContentLeft;
                    //this._origin[1] += this.application.ninja.stage.userContentTop;
                    this._updateTargets();
                    this._origin = this.calculateMultiSelOrigin();
                    this._setTransformOrigin(true);
                }
            }
            else
            {
                this.target = null;
            }
            this.DrawHandles();

            if(event)
            {
                this.eventManager.removeEventListener("selectionDrawn", this, true);
            }
        }
    },

    /*
    _updateHandlesOrigin: {
        value: function () { }
    },
    */

    _updateTargets: {
        value: function(addToUndo) {
            var mod3dObject = [],
                self = this;

            this.application.ninja.selectedElements.forEach(function(element) {
                var curMat = viewUtils.getMatrixFromElement(element);
                var curMatInv = glmat4.inverse(curMat, []);

                viewUtils.pushViewportObj( element );
                var eltCtr = viewUtils.getCenterOfProjection();
                viewUtils.popViewportObj();

                // cache the local to global and global to local matrices
                var l2gMat = viewUtils.getLocalToGlobalMatrix( element );
                var g2lMat = glmat4.inverse( l2gMat, [] );
                eltCtr = MathUtils.transformAndDivideHomogeneousPoint( eltCtr, l2gMat );

                element.elementModel.setProperty("ctr", eltCtr);
                element.elementModel.setProperty("mat", curMat);
                element.elementModel.setProperty("matInv", curMatInv);
                element.elementModel.setProperty("l2g", l2gMat);
                element.elementModel.setProperty("g2l", g2lMat);

                if(addToUndo) {
                    var previousMat = element.elementModel.getProperty("mat").slice(0);
                    var previousStyleStr = {dist:element.elementModel.getProperty("dist"), mat:MathUtils.scientificToDecimal(previousMat, 5)};
                    var newStyleStr = {dist:viewUtils.getPerspectiveDistFromElement(element), mat:MathUtils.scientificToDecimal(viewUtils.getMatrixFromElement(element), 5)};

                    mod3dObject.push({element:element, properties:newStyleStr, previousProperties: previousStyleStr});
                }

            });

            if(addToUndo) {
                ElementsMediator.set3DProperties(mod3dObject, "Change", "rotateTool");
            }

            this.application.ninja.selectedElements.forEach(function(element) {
                element.elementModel.setProperty("mat", viewUtils.getMatrixFromElement(element));
                element.elementModel.setProperty("matInv", glmat4.inverse(element.elementModel.getProperty("mat"), []));
                element.elementModel.setProperty("dist", viewUtils.getPerspectiveDistFromElement(element));
            });
        }
    },

    calculateMultiSelOrigin:
    {
        value: function()
        {
            var minPt,  maxPt, i,j;
            this._startOriginArray = [];
            var len = this.application.ninja.selectedElements.length;
            for (i = 0; i < len; i++)
            {
                // get the next element and localToGlobal matrix
                var elt = this.application.ninja.selectedElements[i];
                var l2g = elt.elementModel.getProperty("l2g");

                // get the element bounds in 'plane' space
                var bounds = viewUtils.getElementViewBounds3D( elt );
                for (j=0;  j<4;  j++)
                {
                    var localPt = bounds[j];
                    //var pt = MathUtils.transformAndDivideHomogeneousPoint( localPt, l2g );
                    var pt = viewUtils.localToStageWorld( localPt, elt );
                    if (!minPt)
                    {
                        minPt = pt.slice();
                        maxPt = pt.slice();
                    }
                    else
                    {
                        minPt[0] = Math.min(minPt[0],pt[0]);  minPt[1] = Math.min(minPt[1],pt[1]);  minPt[2] = Math.min(minPt[2],pt[2]);
                        maxPt[0] = Math.max(maxPt[0],pt[0]);  maxPt[1] = Math.max(maxPt[1],pt[1]);  maxPt[2] = Math.max(maxPt[2],pt[2]);
                    }
                }
            }
            var stageWorldCtr = [ 0.5*(minPt[0] + maxPt[0]),  0.5*(minPt[1] + maxPt[1]), 0.5*(minPt[2] + maxPt[2]) ];
            var globalCtr = MathUtils.transformAndDivideHomogeneousPoint( stageWorldCtr, viewUtils.getStageWorldToGlobalMatrix() );
//          console.log( "resetting _origin to: " + this._origin );

            return globalCtr;
        }
    },

    _setTransformOrigin: {
        value: function(shouldUpdateCenter) {
            if(!this._origin) {
                return;
            }

            var elt,
                element,
                eltCtr,
                ctrOffset,
                matInv;

            if(this.rotateStage || (this.application.ninja.selectedElements.length === 1)) {
                if(this.rotateStage) {
                    element = this.application.ninja.currentDocument.model.documentRoot;
                } else {
                    element = this.application.ninja.selectedElements[0];
                }

                if(shouldUpdateCenter) {

//                    eltCtr = element.elementModel.getProperty("ctr");
//                    ctrOffset = vecUtils.vecSubtract(3, this._origin, eltCtr);

//                    matInv = element.elementModel.getProperty("matInv");
//                    ctrOffset = MathUtils.transformVector(ctrOffset, matInv);

                    element.elementModel.props3D.m_transformCtr = this._startOriginArray[0].slice();
                } else {
                    this._startOriginArray = [];
                    ctrOffset = element.elementModel.props3D.m_transformCtr;
                    if(!ctrOffset) {
                        ctrOffset = [0,0,0];
                    }
                    this._startOriginArray[0] = ctrOffset;
                }
            } else {
               /*
                this._startOriginArray = [];
                var len = this.application.ninja.selectedElements.length;
                for (var i = 0; i < len; i++) {
                    eltCtr = this.application.ninja.selectedElements[i].elementModel.getProperty("ctr");
                    ctrOffset = vecUtils.vecSubtract(3, this._origin, eltCtr);
                    matInv = this.application.ninja.selectedElements[i].elementModel.getProperty("matInv");
                    ctrOffset = MathUtils.transformVector(ctrOffset, matInv);
                    this._startOriginArray[i] = ctrOffset;
                }
                */

                // Update transform ctr for all elements if transform origin was modified
                if (!this._origin)  this._origin = this.calculateMultiSelOrigin();
                var globalCtr = this._origin;
                var len = this.application.ninja.selectedElements.length;
                for (var i=0;  i<len;  i++)
                {
                    // get the next element and localToGlobal matrix
                    elt = this.application.ninja.selectedElements[i];
                    var l2g = viewUtils.getLocalToGlobalMatrix( elt );
                    var g2l = glmat4.inverse( l2g, [] );
                    elt.elementModel.setProperty("g2l", g2l);
                    elt.elementModel.setProperty("l2g", l2g);

                    var localCtr = MathUtils.transformAndDivideHomogeneousPoint(globalCtr,  g2l);
                    viewUtils.pushViewportObj( elt );
                    localCtr = viewUtils.screenToView( localCtr[0],  localCtr[1],  localCtr[2] );
                    viewUtils.popViewportObj();

                    this._startOriginArray[i] = localCtr;
            }
        }
        }
    },

    HandleDoubleClick: {
        value: function () {

            if(!this._target)
            {
                return;
            }

            if(this._activateOriginHandle)
            {
                var len = this.application.ninja.selectedElements.length;
                if( (len === 1) || (this._toolID === "rotateStage3DTool") )
                {
                    this._target.elementModel.props3D.m_transformCtr = null;
                }

                this._handleMode = null;
                this._activateOriginHandle = false;
                this.application.ninja.stage.drawingCanvas.style.cursor = this._cursor;

                this.captureSelectionDrawn(null);
            }
        }
    },

    Reset: {
        value: function() {
            var mat,
                iMat,
                dist,
                mod3dObject = [],
                self = this;

            this.application.ninja.selectedElements.forEach(function(element) {
                // Reset to the identity matrix
                iMat = Matrix.I(4);
                mat = ElementsMediator.getMatrix(element);
//                iMat[12] = mat[12];
//                iMat[13] = mat[13];
//                iMat[14] = mat[14];

                dist = ElementsMediator.getPerspectiveDist(element);

                var previousStyleStr = {dist:dist, mat:mat};
                var newStyleStr = {dist:dist, mat:iMat};

                mod3dObject.push({element:element, properties:newStyleStr, previousProperties: previousStyleStr});
            });

            ElementsMediator.set3DProperties(mod3dObject, "Change", "rotateTool");

            this.isDrawing = false;
            this.endDraw(event);

            // Need to force stage to draw immediately so the new selection center is calculated
            this.application.ninja.stage.draw();
            // And captureSelectionDrawn to draw the transform handles
            this.captureSelectionDrawn(null);
        }
    },

        /**
    * SHIFT/ALT/SPACE Key Handlers
    */
    HandleShiftKeyDown: {
        value: function (event) {
        }
    },

    HandleShiftKeyUp: {
        value: function () {
        }
    },

    HandleSpaceKeyDown: {
        value: function () {
        }
    },

    HandleSpaceUp: {
        value: function () {
        }
    },

    HandleAltKeyDown: {
        value: function(event) {
            this._inLocalMode = !this._inLocalMode;
            this.DrawHandles();
        }
    },

    HandleAltKeyUp: {
        value: function(event) {
            this._inLocalMode = !this._inLocalMode;
            this.DrawHandles();
        }
    },

    handleScroll: {
        value: function(event) {
            this.captureSelectionDrawn(null);
        }
    },

    /**
     * This function is for specifying custom feedback routine
     * upon mouse over.
     * For example, the drawing tools will add a glow when mousing
     * over existing canvas elements to signal to the user that
     * the drawing operation will act on the targeted canvas.
     */
    _showFeedbackOnMouseMove : {
        value: function (event) {
            this._canSnap = false;
            if(this._target && this._handles)
            {
                var len = this._handles.length;
                var i = 0,
                    toolHandle,
                    c,
                    point = webkitConvertPointFromPageToNode(this.application.ninja.stage.canvas,
                                                            new WebKitPoint(event.pageX, event.pageY));
                for (i=0; i<len; i++)
                {
                    toolHandle = this._handles[i];
                    c = toolHandle.collidesWithPoint(point.x, point.y);
                    if(c === 1)
                    {
                        this.application.ninja.stage.drawingCanvas.style.cursor = "move";
                        this._handleMode = i;
                        this._activateOriginHandle = true;
                        this._canSnap = true;
                        return;
                    }
                    else if(c === 2)
                    {
                        this.application.ninja.stage.drawingCanvas.style.cursor = toolHandle._cursor;
                        this._handleMode = i;
                        this._activateOriginHandle = false;
                        return;
                    }
                }
            }

            this._handleMode = null;
            this._activateOriginHandle = false;
   //            this.application.ninja.stage.drawingCanvas.style.cursor = this._cursor;
            this.application.ninja.stage.drawingCanvas.style.cursor = "auto";
        }
    },

    getMousePoints: {
        value: function()
        {
            var pt0 = { x:this.downPoint.x, y:this.downPoint.y, z:this.downPoint.z };
            var pt1 = { x:this.upPoint.x, y:this.upPoint.y, z:this.upPoint.z };

            return {pt0:pt0, pt1:pt1};
        }
    },

    DrawHandles: {
        value: function (angle) {
            this.application.ninja.stage.clearDrawingCanvas();

            var item = this._target;
            if(!item)
            {
                return;
            }

            // Draw tool handles

            // set the element to be the viewport object - temporarily
            var lMode = this._inLocalMode;
            if( (this._toolID !== "rotateStage3DTool") &&
                    (this.application.ninja.selectedElements.length === 1) )
            {
                viewUtils.pushViewportObj( item );
            }
            else
            {
                lMode = false;
                viewUtils.pushViewportObj( this.application.ninja.currentDocument.model.documentRoot );
            }
            var base = this._origin;
            //console.log( "Rotate3DToolBase.DrawHandles, base: " + base );

            if( (this._handleMode !== null) && !this._activateOriginHandle )
            {
                switch(this._handleMode)
                {
                    case 0:
                        this._handles[1]._strokeStyle = 'rgba(0, 255, 0, 0.2)';
                        this._handles[2]._strokeStyle = 'rgba(0, 0, 255, 0.2)';
                        break;
                    case 1:
                        this._handles[0]._strokeStyle = 'rgba(255, 0, 0, 0.2)';
                        this._handles[2]._strokeStyle = 'rgba(0, 0, 255, 0.2)';
                        break;
                    case 2:
                        this._handles[0]._strokeStyle = 'rgba(255, 0, 0, 0.2)';
                        this._handles[1]._strokeStyle = 'rgba(0, 255, 0, 0.2)';
                        break;
                }
            }
            this._handles[0].draw(base, item, lMode);
            this._handles[1].draw(base, item, lMode);
            this._handles[2].draw(base, item, lMode);

            if(angle && (this._handleMode !== null))
            {
                this._handles[this._handleMode].drawShadedAngle(angle, this._startPoint);
            }


            this._handles[0]._strokeStyle = 'rgba(255, 0, 0, 1)';
            this._handles[1]._strokeStyle = 'rgba(0, 255, 0, 1)';
            this._handles[2]._strokeStyle = 'rgba(0, 0, 255, 1)';

            viewUtils.popViewportObj();
        }
    }

});