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-rw-r--r--assets/canvas-runtime.js196
1 files changed, 196 insertions, 0 deletions
diff --git a/assets/canvas-runtime.js b/assets/canvas-runtime.js
index 4fb0a327..524cdfeb 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 ///////////////////////////////////////////////////////////////////////
@@ -2042,8 +2049,197 @@ NinjaCvsRt.RuntimeSubPath = Object.create(NinjaCvsRt.RuntimeGeomObj, {
2042 } 2049 }
2043 } 2050 }
2044}); 2051});
2052
2045// ************************************************************************** 2053// **************************************************************************
2046// END runtime for the pen tool path 2054// END runtime for the pen tool path
2047// ************************************************************************** 2055// **************************************************************************
2048 2056
2049 2057
2058// ***************************************************************************
2059// runtime for brush tool brush stroke
2060// ***************************************************************************
2061
2062NinjaCvsRt.RuntimeBrushStroke = Object.create(NinjaCvsRt.RuntimeGeomObj, {
2063 // array of brush stroke points
2064 _LocalPoints: { value: null, writable: true },
2065 _OrigLocalPoints: {value: null, writable: true},
2066
2067 _strokeWidth: {value: 0, writable: true},
2068 _strokeColor: {value: 0, writable: true},
2069 _strokeHardness: {value: 0, writable: true},
2070 _strokeUseCalligraphic : {value: 0, writable: true},
2071 _strokeAngle : {value: 0, writable: true},
2072
2073 //stroke smoothing properties
2074 _strokeDoSmoothing: {value: 0, writable: true},
2075 _strokeAmountSmoothing : {value: 0, writable: true},
2076
2077 geomType: {
2078 value: function () {
2079 return this.GEOM_TYPE_BRUSH_STROKE;
2080 }
2081 },
2082
2083 _copyCoordinates3D: {
2084 value: function(srcCoord, destCoord){
2085 var i=0;
2086 var numPoints = srcCoord.length;
2087 for (i=0;i<numPoints;i++){
2088 destCoord[i] = [srcCoord[i][0],srcCoord[i][1],srcCoord[i][2]];
2089 }
2090 }
2091 },
2092
2093 _doSmoothing: {
2094 value: function() {
2095 var numPoints = this._LocalPoints.length;
2096 if (this._strokeDoSmoothing && numPoints>1) {
2097 this._copyCoordinates3D(this._OrigLocalPoints, this._LocalPoints);
2098 //iterations of Laplacian smoothing (setting the points to the average of their neighbors)
2099 var numLaplacianIterations = this._strokeAmountSmoothing;
2100 for (var n=0;n<numLaplacianIterations;n++){
2101 var newPoints = this._LocalPoints.slice(0); //I think this performs a copy by reference, which would make the following a SOR step
2102 for (var i=1;i<numPoints-1;i++) {
2103 var avgPos = [ 0.5*(this._LocalPoints[i-1][0] + this._LocalPoints[i+1][0]),
2104 0.5*(this._LocalPoints[i-1][1] + this._LocalPoints[i+1][1]),
2105 0.5*(this._LocalPoints[i-1][2] + this._LocalPoints[i+1][2])] ;
2106 newPoints[i] = avgPos;
2107 }
2108 this._LocalPoints = newPoints.slice(0);
2109 }
2110 }
2111 }
2112 },
2113
2114 importJSON: {
2115 value: function(jo) {
2116 if (this.geomType()!== jo.geomType){
2117 return;
2118 }
2119 //the geometry for this object
2120 this._LocalPoints = jo.localPoints.slice(0);
2121 this._OrigLocalPoints = jo.origLocalPoints.slice(0);
2122 this._copyCoordinates3D(jo.localPoints, this._LocalPoints); //todo is this necessary in addition to the slice(0) above?
2123 this._copyCoordinates3D(jo.origLocalPoints, this._OrigLocalPoints); //todo <ditto>
2124
2125 //stroke appearance properties
2126 this._strokeWidth = jo.strokeWidth;
2127 this._strokeColor = jo.strokeColor;
2128 this._strokeHardness = jo.strokeHardness;
2129 this._strokeUseCalligraphic = jo.strokeUseCalligraphic;
2130 this._strokeAngle = jo.strokeAngle;
2131
2132 //stroke smoothing properties
2133 this._strokeDoSmoothing = jo.strokeDoSmoothing;
2134 this._strokeAmountSmoothing = jo.strokeAmountSmoothing;
2135
2136 this._doSmoothing(); //after smoothing, the stroke is ready to be rendered
2137 }
2138 },
2139
2140 render: {
2141 value: function() {
2142 // get the world
2143 var world = this.getWorld();
2144 if (!world) {
2145 throw( "null world in brush stroke render" );
2146 return;
2147 }
2148
2149 // get the context
2150 var ctx = world.get2DContext();
2151 if (!ctx) {
2152 throw( "null world in brush stroke render" );
2153 return;
2154 }
2155
2156 ctx.save();
2157
2158 //**** BEGIN RENDER CODE BLOCK ****
2159 var points = this._LocalPoints;
2160 var numPoints = points.length;
2161 var tempP, p;
2162 if (this._strokeUseCalligraphic) {
2163 //build the stamp for the brush stroke
2164 var t=0;
2165 var numTraces = this._strokeWidth;
2166 var halfNumTraces = numTraces*0.5;
2167 var opaqueRegionHalfWidth = 0.5*this._strokeHardness*numTraces*0.01; //the 0.01 is to convert the strokeHardness from [0,100] to [0,1]
2168 var maxTransparentRegionHalfWidth = halfNumTraces-opaqueRegionHalfWidth;
2169
2170 //build an angled (calligraphic) brush stamp
2171 var deltaDisplacement = [Math.cos(this._strokeAngle),Math.sin(this._strokeAngle)];
2172 deltaDisplacement = VecUtils.vecNormalize(2, deltaDisplacement, 1);
2173 var startPos = [-halfNumTraces*deltaDisplacement[0],-halfNumTraces*deltaDisplacement[1]];
2174
2175 var brushStamp = [];
2176 for (t=0;t<numTraces;t++){
2177 var brushPt = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
2178 brushStamp.push(brushPt);
2179 }
2180
2181 ctx.lineJoin="bevel";
2182 ctx.lineCap="butt";
2183 ctx.globalCompositeOperation = 'source-over';
2184 ctx.globalAlpha = this._strokeColor[3];
2185
2186 for (t=0;t<numTraces;t++){
2187 var disp = [brushStamp[t][0], brushStamp[t][1]];
2188 var alphaVal = 1.0;
2189 var distFromOpaqueRegion = Math.abs(t-halfNumTraces) - opaqueRegionHalfWidth;
2190 if (distFromOpaqueRegion>0) {
2191 var transparencyFactor = distFromOpaqueRegion/maxTransparentRegionHalfWidth;
2192 alphaVal = 1.0 - transparencyFactor;//(transparencyFactor*transparencyFactor);//the square term produces nonlinearly varying alpha values
2193 alphaVal *= 0.5; //factor that accounts for lineWidth == 2
2194 }
2195 ctx.save();
2196 if (t === (numTraces-1) || t === 0){
2197 ctx.lineWidth = 1;
2198 } else {
2199 ctx.lineWidth=2;
2200 }
2201 ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
2202 ctx.translate(disp[0],disp[1]);
2203 ctx.beginPath();
2204 p = points[0];
2205 ctx.moveTo(p[0],p[1]);
2206 for (var i=0;i<numPoints;i++){
2207 p = points[i];
2208 ctx.lineTo(p[0],p[1]);
2209 }
2210 ctx.stroke();
2211 ctx.restore();
2212 }
2213 } else {
2214 ctx.globalCompositeOperation = 'lighter'; //we wish to add up the colors
2215 ctx.globalAlpha = this._strokeColor[3];
2216 ctx.lineCap = "round";
2217 ctx.lineJoin="round";
2218 var minStrokeWidth = (this._strokeHardness*this._strokeWidth)/100; //the hardness is the percentage of the stroke width that's fully opaque
2219 var numlayers = 1 + Math.ceil((this._strokeWidth-minStrokeWidth)*0.5);
2220 var alphaVal = 1.0/(numlayers); //this way the alpha at the first path will be 1
2221 ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
2222 for (var l=0;l<numlayers;l++){
2223 ctx.beginPath();
2224 p = points[0];
2225 ctx.moveTo(p[0],p[1]);
2226 if (numPoints===1){
2227 //display a tiny segment as a single point
2228 ctx.lineTo(p[0],p[1]+0.01);
2229 }
2230 for (var i=1;i<numPoints;i++){
2231 p = points[i];
2232 ctx.lineTo(p[0],p[1]);
2233 }
2234 ctx.lineWidth=2*l+minStrokeWidth;
2235 ctx.stroke();
2236 }//for every layer l
2237 } //if there is no calligraphic stroke
2238
2239 //**** END RENDER CODE BLOCK ****
2240
2241 ctx.restore();
2242 }
2243 }
2244});
2245