path: root/js/helper-classes/3D/view-utils.js

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var Montage = require("montage/core/core").Montage,
    Component = require("montage/ui/component").Component,
    vecUtils = require("js/helper-classes/3D/vec-utils").VecUtils,
    Rectangle = require("js/helper-classes/3D/rectangle").Rectangle,
    ElementsMediator = require("js/mediators/element-mediator").ElementMediator;
///////////////////////////////////////////////////////////////////////
// Class ViewUtils
//      Viewing Utility functions
///////////////////////////////////////////////////////////////////////
exports.ViewUtils = Montage.create(Component, {
    ///////////////////////////////////////////////////////////////////////
    // Instance variables
    ///////////////////////////////////////////////////////////////////////

    m_viewportObj : { value: null},
    _perspectiveDist: { value: null},

    // keep a stack of viewport objects
    _viewportObjStack: { value: []},

    _rootElement: { value: null},
    _stageElement: { value: null},

    ///////////////////////////////////////////////////////////////////////
    // Property accessors
    ///////////////////////////////////////////////////////////////////////
    setViewportObj: {
        value: function( vp ) {
            this.m_viewportObj = vp;

            this._perspectiveDist = this.getPerspectiveDistFromElement( vp );
        }
    },
    getViewportObj: { value: function()                 {  return this.m_viewportObj;   } },

    setRootElement: { value: function( elt )            { this._rootElement = elt; } },
    getRootElement: { value: function ()                { return this._rootElement;        } },

    setStageElement: { value: function( elt )    {  this._stageElement = elt;    } },
    getStageElement: { value: function () { return this._stageElement; } },


    getPerspectiveDistance: { value: function () { return this._perspectiveDist; } },

    ///////////////////////////////////////////////////////////////////////
    // Camera and View Methods
    ///////////////////////////////////////////////////////////////////////
    getMatrixFromElement: {
        value: function( elt ) {
            var mat = ElementsMediator.getMatrix(elt);
            if(mat)
            {
                return mat;
            }
            else
            {
                return Matrix.I(4);
            }
        }
    },

    setMatrixForElement: {
        value: function( elt, mat, isChanging ) {
            ElementsMediator.setMatrix(elt, mat, isChanging);
        }
    },


    elementHas3D: {
        value: function( elt ) {
            return ElementsMediator.has3D(elt);
        }
    },

    getElementPlane: {
        value: function( elt ) {
            var bounds = this.getElementViewBounds3D( elt );
            var xArr = new Array(),  yArr = new Array(),  zArr = new Array();
            for (var j=0;  j<4;  j++)
            {
                var pt = this.localToGlobal( bounds[j],  elt );
                xArr.push(pt[0]);  yArr.push(pt[1]);  zArr.push(pt[2]);
            }
            var normal = MathUtils.getPolygonNormal( 4, xArr, yArr, zArr );
            //var d = -MathUtils.dot3( bounds[0], normal );
            var d = -MathUtils.dot3( [xArr[0],yArr[0],zArr[0]], normal );
            normal[3] = d;

            return normal;
        }
    },

    getUnprojectedElementPlane: {
        value: function( elt ) {
            var mat = this.getMatrixFromElement(elt);
            var plane = [mat[8],  mat[9],  mat[10],  mat[11]];

            // The translation value is a point on the plane
            this.pushViewportObj( elt );
            var ptOnPlane = this.getCenterOfProjection();
            this.popViewportObj();

            ptOnPlane[2] = 0;

            ptOnPlane = this.localToStageWorld(ptOnPlane, elt);
            plane[3] = -vecUtils.vecDot(3, plane, ptOnPlane );

            return plane;
        }
    },

    /*
     *  This method will return a normal to a plane containing the Z axis and either the
     *  x or y axis of the element.
     */
    getNormalToUnprojectedElementPlane:
    {
        value: function( elt, axis,  localMode )
        {
            var objMat = this.getMatrixFromElement(elt);
            var objMatInv = glmat4.inverse( objMat, [] );

            var xVec = [1,0,0];
            var yVec = [0,1,0];
            var zVec = [0,0,1];

            var stage = this.application.ninja.currentDocument.model.documentRoot;
            var stageMat = this.getMatrixFromElement(stage);

            var mat = glmat4.multiply( stageMat, objMat, [] );

            var viewDir;
            if (localMode)
            {
                var matInv = glmat4.inverse( mat, [] );
                viewDir = MathUtils.transformVector( [0,0,1], matInv );
            }
            else
            {
                var stageInv = glmat4.inverse( stageMat, [] );
                viewDir = MathUtils.transformVector( [0,0,1],  stageInv );
            }

            var plane;
            var xDot, yDot, zDot;
            switch (axis)
            {
                case 0:
                    yDot = Math.abs(vecUtils.vecDot(3, yVec, viewDir));
                    zDot = Math.abs(vecUtils.vecDot(3, zVec, viewDir));
                    if(yDot > zDot)
                        plane = vecUtils.vecCross( 3, zVec, xVec );
                    else
                        plane = vecUtils.vecCross( 3, yVec, xVec );
                    break;

                case 1:
                    xDot = Math.abs(vecUtils.vecDot(3, yVec, viewDir));
                    zDot = Math.abs(vecUtils.vecDot(3, zVec, viewDir));
                    if(xDot > zDot)
                        plane = vecUtils.vecCross( 3, zVec, yVec );
                    else
                        plane = vecUtils.vecCross( 3, xVec, yVec );
                    break;
                    break;

                case 2:
                    xDot = Math.abs(vecUtils.vecDot(3, xVec, viewDir));
                    yDot = Math.abs(vecUtils.vecDot(3, yVec, viewDir));

                    if(xDot > yDot)
                        plane = vecUtils.vecCross( 3, yVec, zVec );
                    else
                        plane = vecUtils.vecCross( 3, xVec, zVec );
                    break;
            }

            if (localMode)  plane = MathUtils.transformVector( plane, objMat );

            // The transla