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added hit detection for symbol edges to canvas renderer with unit tests

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Added unit tests for hit detection on invisible canvas layer

simplified unit test for hit detection on invisible canvas
This commit is contained in:
Arjen Kopinga
2012-03-06 11:50:15 +01:00
parent 81b2b524ec
commit a836224a14
2 changed files with 45 additions and 5 deletions
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33
lib/OpenLayers/Renderer/Canvas.js
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@@ -322,6 +322,11 @@ OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
this.canvas.lineCap = "round";
this.canvas.lineJoin = "round";
if (this.hitDetection) {
this.hitContext.lineCap = "round";
this.hitContext.lineJoin = "round";
}
// Scale and rotate symbols, using precalculated bounds whenever possible.
if (style.graphicName in this.cachedSymbolBounds) {
symbolBounds = this.cachedSymbolBounds[style.graphicName];
@@ -393,9 +398,7 @@ OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
if (style.stroke !== false) {
this.setCanvasStyle("stroke", style);
this.canvas.beginPath();
for (i=0; i<symbol.length; i=i+2) {
x = symbol[i];
y = symbol[i+1];
@@ -404,6 +407,21 @@ OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
}
this.canvas.closePath();
this.canvas.stroke();
if (this.hitDetection) {
this.setHitContextStyle("stroke", featureId, style, scaling);
this.hitContext.beginPath();
for (i=0; i<symbol.length; i=i+2) {
x = symbol[i];
y = symbol[i+1];
if (i == 0) this.hitContext.moveTo(x,y);
this.hitContext.lineTo(x,y);
}
this.hitContext.closePath();
this.hitContext.stroke();
}
}
style.strokeWidth = unscaledStrokeWidth;
@@ -465,7 +483,7 @@ OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
* featureId - {String} The feature id.
* symbolizer - {<OpenLayers.Symbolizer>} The symbolizer.
*/
setHitContextStyle: function(type, featureId, symbolizer) {
setHitContextStyle: function(type, featureId, symbolizer, strokeScaling) {
var hex = this.featureIdToHex(featureId);
if (type == "fill") {
this.hitContext.globalAlpha = 1.0;
@@ -473,8 +491,13 @@ OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
} else if (type == "stroke") {
this.hitContext.globalAlpha = 1.0;
this.hitContext.strokeStyle = hex;
// bump up stroke width to deal with antialiasing
this.hitContext.lineWidth = symbolizer.strokeWidth + 2;
// bump up stroke width to deal with antialiasing. If strokeScaling is defined, we're rendering a symbol
// on a transformed canvas, so the antialias width bump has to scale as well.
if (typeof strokeScaling === "undefined") {
this.hitContext.lineWidth = symbolizer.strokeWidth + 2;
} else {
if (!isNaN(strokeScaling)) { this.hitContext.lineWidth = symbolizer.strokeWidth + 2.0 / strokeScaling; }
}
} else {
this.hitContext.globalAlpha = 0;
this.hitContext.lineWidth = 1;