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-rw-r--r--assets/canvas-runtime.js199
1 files changed, 198 insertions, 1 deletions
diff --git a/assets/canvas-runtime.js b/assets/canvas-runtime.js
index 3ed7ed0f..b5b08cea 100644
--- a/assets/canvas-runtime.js
+++ b/assets/canvas-runtime.js
@@ -382,6 +382,12 @@ NinjaCvsRt.GLRuntime = Object.create(Object.prototype, {
382 obj = Object.create(NinjaCvsRt.RuntimeSubPath, {_materials: { value:[], writable:true}}); 382 obj = Object.create(NinjaCvsRt.RuntimeSubPath, {_materials: { value:[], writable:true}});
383 obj.importJSON (jObj ); 383 obj.importJSON (jObj );
384 break; 384 break;
385
386 case 6: //brushstroke (created by brush tool)
387 obj = Object.create(NinjaCvsRt.RuntimeBrushStroke, {_materials: { value:[], writable:true}});
388 obj.importJSON (jObj );
389 break;
390
385 default: 391 default:
386 throw new Error( "Attempting to load unrecognized object type: " + type ); 392 throw new Error( "Attempting to load unrecognized object type: " + type );
387 break; 393 break;
@@ -524,6 +530,7 @@ NinjaCvsRt.RuntimeGeomObj = Object.create(Object.prototype, {
524 GEOM_TYPE_LINE: { value: 3, writable: false }, 530 GEOM_TYPE_LINE: { value: 3, writable: false },
525 GEOM_TYPE_PATH: { value: 4, writable: false }, 531 GEOM_TYPE_PATH: { value: 4, writable: false },
526 GEOM_TYPE_CUBIC_BEZIER: { value: 5, writable: false }, 532 GEOM_TYPE_CUBIC_BEZIER: { value: 5, writable: false },
533 GEOM_TYPE_BRUSH_STROKE: { value: 6, writable: false },
527 GEOM_TYPE_UNDEFINED: { value: -1, writable: false }, 534 GEOM_TYPE_UNDEFINED: { value: -1, writable: false },
528 535
529 /////////////////////////////////////////////////////////////////////// 536 ///////////////////////////////////////////////////////////////////////
@@ -2006,8 +2013,198 @@ NinjaCvsRt.RuntimeSubPath = Object.create(NinjaCvsRt.RuntimeGeomObj, {
2006 ctx.restore(); 2013 ctx.restore();
2007 } 2014 }
2008 } 2015 }
2009});// ************************************************************************** 2016});
2017
2018// **************************************************************************
2010// END runtime for the pen tool path 2019// END runtime for the pen tool path
2011// ************************************************************************** 2020// **************************************************************************
2012 2021
2013 2022
2023// ***************************************************************************
2024// runtime for brush tool brush stroke
2025// ***************************************************************************
2026
2027NinjaCvsRt.RuntimeBrushStroke = Object.create(NinjaCvsRt.RuntimeGeomObj, {
2028 // array of brush stroke points
2029 _LocalPoints: { value: null, writable: true },
2030 _OrigLocalPoints: {value: null, writable: true},
2031
2032 _strokeWidth: {value: 0, writable: true},
2033 _strokeColor: {value: 0, writable: true},
2034 _strokeHardness: {value: 0, writable: true},
2035 _strokeUseCalligraphic : {value: 0, writable: true},
2036 _strokeAngle : {value: 0, writable: true},
2037
2038 //stroke smoothing properties
2039 _strokeDoSmoothing: {value: 0, writable: true},
2040 _strokeAmountSmoothing : {value: 0, writable: true},
2041
2042 geomType: {
2043 value: function () {
2044 return this.GEOM_TYPE_BRUSH_STROKE;
2045 }
2046 },
2047
2048 _copyCoordinates3D: {
2049 value: function(srcCoord, destCoord){
2050 var i=0;
2051 var numPoints = srcCoord.length;
2052 for (i=0;i<numPoints;i++){
2053 destCoord[i] = [srcCoord[i][0],srcCoord[i][1],srcCoord[i][2]];
2054 }
2055 }
2056 },
2057
2058 _doSmoothing: {
2059 value: function() {
2060 var numPoints = this._LocalPoints.length;
2061 if (this._strokeDoSmoothing && numPoints>1) {
2062 this._copyCoordinates3D(this._OrigLocalPoints, this._LocalPoints);
2063 //iterations of Laplacian smoothing (setting the points to the average of their neighbors)
2064 var numLaplacianIterations = this._strokeAmountSmoothing;
2065 for (var n=0;n<numLaplacianIterations;n++){
2066 var newPoints = this._LocalPoints.slice(0); //I think this performs a copy by reference, which would make the following a SOR step
2067 for (var i=1;i<numPoints-1;i++) {
2068 var avgPos = [ 0.5*(this._LocalPoints[i-1][0] + this._LocalPoints[i+1][0]),
2069 0.5*(this._LocalPoints[i-1][1] + this._LocalPoints[i+1][1]),
2070 0.5*(this._LocalPoints[i-1][2] + this._LocalPoints[i+1][2])] ;
2071 newPoints[i] = avgPos;
2072 }
2073 this._LocalPoints = newPoints.slice(0);
2074 }
2075 }
2076 }
2077 },
2078
2079 importJSON: {
2080 value: function(jo) {
2081 if (this.geomType()!== jo.geomType){
2082 return;
2083 }
2084 //the geometry for this object
2085 this._LocalPoints = jo.localPoints.slice(0);
2086 this._OrigLocalPoints = jo.origLocalPoints.slice(0);
2087 this._copyCoordinates3D(jo.localPoints, this._LocalPoints); //todo is this necessary in addition to the slice(0) above?
2088 this._copyCoordinates3D(jo.origLocalPoints, this._OrigLocalPoints); //todo <ditto>
2089
2090 //stroke appearance properties
2091 this._strokeWidth = jo.strokeWidth;
2092 this._strokeColor = jo.strokeColor;
2093 this._strokeHardness = jo.strokeHardness;
2094 this._strokeUseCalligraphic = jo.strokeUseCalligraphic;
2095 this._strokeAngle = jo.strokeAngle;
2096
2097 //stroke smoothing properties
2098 this._strokeDoSmoothing = jo.strokeDoSmoothing;
2099 this._strokeAmountSmoothing = jo.strokeAmountSmoothing;
2100
2101 this._doSmoothing(); //after smoothing, the stroke is ready to be rendered
2102 }
2103 },
2104
2105 render: {
2106 value: function() {
2107 // get the world
2108 var world = this.getWorld();
2109 if (!world) {
2110 throw( "null world in brush stroke render" );
2111 return;
2112 }
2113
2114 // get the context
2115 var ctx = world.get2DContext();
2116 if (!ctx) {
2117 throw( "null world in brush stroke render" );
2118 return;
2119 }
2120
2121 ctx.save();
2122
2123 //**** BEGIN RENDER CODE BLOCK ****
2124 var points = this._LocalPoints;
2125 var numPoints = points.length;
2126 var tempP, p;
2127 if (this._strokeUseCalligraphic) {
2128 //build the stamp for the brush stroke
2129 var t=0;
2130 var numTraces = this._strokeWidth;
2131 var halfNumTraces = numTraces*0.5;
2132 var opaqueRegionHalfWidth = 0.5*this._strokeHardness*numTraces*0.01; //the 0.01 is to convert the strokeHardness from [0,100] to [0,1]
2133 var maxTransparentRegionHalfWidth = halfNumTraces-opaqueRegionHalfWidth;
2134
2135 //build an angled (calligraphic) brush stamp
2136 var deltaDisplacement = [Math.cos(this._strokeAngle),Math.sin(this._strokeAngle)];
2137 deltaDisplacement = VecUtils.vecNormalize(2, deltaDisplacement, 1);
2138 var startPos = [-halfNumTraces*deltaDisplacement[0],-halfNumTraces*deltaDisplacement[1]];
2139
2140 var brushStamp = [];
2141 for (t=0;t<numTraces;t++){
2142 var brushPt = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
2143 brushStamp.push(brushPt);
2144 }
2145
2146 ctx.lineJoin="bevel";
2147 ctx.lineCap="butt";
2148 ctx.globalCompositeOperation = 'source-over';
2149 ctx.globalAlpha = this._strokeColor[3];
2150
2151 for (t=0;t<numTraces;t++){
2152 var disp = [brushStamp[t][0], brushStamp[t][1]];
2153 var alphaVal = 1.0;
2154 var distFromOpaqueRegion = Math.abs(t-halfNumTraces) - opaqueRegionHalfWidth;
2155 if (distFromOpaqueRegion>0) {
2156 var transparencyFactor = distFromOpaqueRegion/maxTransparentRegionHalfWidth;
2157 alphaVal = 1.0 - transparencyFactor;//(transparencyFactor*transparencyFactor);//the square term produces nonlinearly varying alpha values
2158 alphaVal *= 0.5; //factor that accounts for lineWidth == 2
2159 }
2160 ctx.save();
2161 if (t === (numTraces-1) || t === 0){
2162 ctx.lineWidth = 1;
2163 } else {
2164 ctx.lineWidth=2;
2165 }
2166 ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
2167 ctx.translate(disp[0],disp[1]);
2168 ctx.beginPath();
2169 p = points[0];
2170 ctx.moveTo(p[0],p[1]);
2171 for (var i=0;i<numPoints;i++){
2172 p = points[i];
2173 ctx.lineTo(p[0],p[1]);
2174 }
2175 ctx.stroke();
2176 ctx.restore();
2177 }
2178 } else {
2179 ctx.globalCompositeOperation = 'lighter'; //we wish to add up the colors
2180 ctx.globalAlpha = this._strokeColor[3];
2181 ctx.lineCap = "round";
2182 ctx.lineJoin="round";
2183 var minStrokeWidth = (this._strokeHardness*this._strokeWidth)/100; //the hardness is the percentage of the stroke width that's fully opaque
2184 var numlayers = 1 + Math.ceil((this._strokeWidth-minStrokeWidth)*0.5);
2185 var alphaVal = 1.0/(numlayers); //this way the alpha at the first path will be 1
2186 ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
2187 for (var l=0;l<numlayers;l++){
2188 ctx.beginPath();
2189 p = points[0];
2190 ctx.moveTo(p[0],p[1]);
2191 if (numPoints===1){
2192 //display a tiny segment as a single point
2193 ctx.lineTo(p[0],p[1]+0.01);
2194 }
2195 for (var i=1;i<numPoints;i++){
2196 p = points[i];
2197 ctx.lineTo(p[0],p[1]);
2198 }
2199 ctx.lineWidth=2*l+minStrokeWidth;
2200 ctx.stroke();
2201 }//for every layer l
2202 } //if there is no calligraphic stroke
2203
2204 //**** END RENDER CODE BLOCK ****
2205
2206 ctx.restore();
2207 }
2208 }
2209});
2210