From b89a7ee8b956c96a1dcee995ea840feddc5d4b27 Mon Sep 17 00:00:00 2001 From: Pierre Frisch Date: Thu, 22 Dec 2011 07:25:50 -0800 Subject: First commit of Ninja to ninja-internal Signed-off-by: Valerio Virgillito --- js/helper-classes/3D/element-planes.js | 134 +++++++++++++++++++++++++++++++++ 1 file changed, 134 insertions(+) create mode 100644 js/helper-classes/3D/element-planes.js (limited to 'js/helper-classes/3D/element-planes.js') diff --git a/js/helper-classes/3D/element-planes.js b/js/helper-classes/3D/element-planes.js new file mode 100644 index 00000000..7ccf311e --- /dev/null +++ b/js/helper-classes/3D/element-planes.js @@ -0,0 +1,134 @@ +/* +This file contains proprietary software owned by Motorola Mobility, Inc.
+No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.
+(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved. + */ + +/////////////////////////////////////////////////////////////////////// +// Class ElementPlanes +// This class represents the 5 planes generated by an element +// in the world - the face itself, and one plane going back in Z +// for each side of the element. Lines drawn will clip against +// those 5 planes. +/////////////////////////////////////////////////////////////////////// +var viewUtils = require("js/helper-classes/3D/view-utils").ViewUtils, + vecUtils = require("js/helper-classes/3D/vec-utils").VecUtils, + Rectangle = require("js/helper-classes/3D/rectangle").Rectangle; + +var ElementPlanes = exports.ElementPlanes = Object.create(Object.prototype, { + /////////////////////////////////////////////////////////////////////// + // Instance variables + /////////////////////////////////////////////////////////////////////// + + // maintain a back pointer to the original element + _elt: { value: null, writable: true }, + + // the 4 3D boundary points in world space + _boundaryPts: { value: null, writable: true }, + + // the 2D boundary rectangle. Used for quick rejection tests. + _rect: { value: null, writable: true }, + _zMin: { value: 0, writable: true }, + _zMax: { value: 0, writable: true }, + + // keep a flag indicating that the element is back facing + _backFacing: { value: false, writable: true }, + + // cache the normal + _planeEq: { value: null, writable: true }, + + /////////////////////////////////////////////////////////////////////// + // Property accessors + /////////////////////////////////////////////////////////////////////// + setElement: { value: function( elt ) { this._elt = elt; } }, + getElement: { value: function() { return this._elt; } }, + + getPlaneEq: { value: function() { return this._planeEq.slice(0); } }, + setPlaneEq: { value: function(p) { this._planeEq = p; } }, + + getRectangle: { value: function() { return this._rect; } }, + getBoundaryPoints: { value: function() { return this._boundaryPts; } }, + isBackFacing: { value: function() { return this._backFacing; } }, + + getZMin: { value: function() { return this._zMin; } }, + getZMax: { value: function() { return this._zMax; } }, + + /////////////////////////////////////////////////////////////////////// + // Methods + /////////////////////////////////////////////////////////////////////// + init: { + value: function() + { + if (this._elt) + { + // get the 3D boundary points + var elt = this._elt; + this._boundaryPts = viewUtils.getElementViewBounds3D( elt ); + //var mat = viewUtils.getMatrixFromElement( elt ); + + var tmpMat = viewUtils.getLocalToGlobalMatrix( elt ); + for (var i=0; i<4; i++) + { +// this._boundaryPts[i] = viewUtils.localToGlobal(this._boundaryPts[i], elt ); + this._boundaryPts[i] = viewUtils.localToGlobal2(this._boundaryPts[i], tmpMat); + } + + // set the backfacing flag based on the direction of the normal + // for the purposes of stage drawing, we use a left-handed coordinate system + // (as opposed to the left-handed system used in the browser). With that + // assumption, the points are specified counterclockwise on the stage, producing + // a negative Z for the normal, hence a positive Z implies back facing. + var nrm = this.computeNormal(); + this._backFacing = false; + if (nrm[2] > 0) + this._backFacing = true; + else + MathUtils.negate( nrm ); + + // create the plane equation + //var d = -( nrm.dot( this._boundaryPts[0]) ); + var d = -vecUtils.vecDot(3, nrm, this._boundaryPts[0]); + var planeEq = Vector.create( [nrm[0], nrm[1], nrm[2], d] ); + this.setPlaneEq( planeEq ); + + // get the 2D rectangle + var rect = Object.create(Rectangle, {}); + rect.setLeft( this._boundaryPts[0][0] ); + rect.setTop( this._boundaryPts[0][1] ); + rect.setRight( this._boundaryPts[0][0] ); + rect.setBottom( this._boundaryPts[0][1] ); + this._zMin = this._boundaryPts[0][2]; + this._zMax = this._boundaryPts[0][2]; + for (var i=1; i<4; i++) + { + rect.unionPoint( this._boundaryPts[i] ); + var z = this._boundaryPts[i][2]; + if (z < this._zMin) this._zMin = z; + if (z > this._zMax) this._zMax = z; + } + this._rect = rect; + } + } + }, + + computeNormal: { + value: function() + { + var xPts = new Array(), yPts = new Array(), zPts = new Array(); + var n = this._boundaryPts.length; + for (var i=0; i