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Fix clip extent calculation for tile layers

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This commit is contained in:
Andreas Hocevar
2016-08-13 10:56:36 +02:00
parent ba4aac72f3
commit 92e2b72f55
1 changed files with 12 additions and 7 deletions
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19
src/ol/renderer/canvas/tilelayer.js
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@@ -240,7 +240,8 @@ ol.renderer.canvas.TileLayer.prototype.renderTileImages = function(context, fram
var hasRenderListeners = layer.hasListener(ol.render.EventType.RENDER);
var renderContext = context;
var drawOffsetX, drawOffsetY, drawScale, drawSize;
var drawScale = 1;
var drawOffsetX, drawOffsetY, drawSize;
if (rotation || hasRenderListeners) {
renderContext = this.context;
var renderCanvas = renderContext.canvas;
@@ -294,14 +295,18 @@ ol.renderer.canvas.TileLayer.prototype.renderTileImages = function(context, fram
var ox = drawOffsetX || 0;
var oy = drawOffsetY || 0;
renderContext.save();
var cx = (renderContext.canvas.width * pixelRatio) / 2;
var cy = (renderContext.canvas.height * pixelRatio) / 2;
var cx = (renderContext.canvas.width) / 2;
var cy = (renderContext.canvas.height) / 2;
ol.render.canvas.rotateAtOffset(renderContext, -rotation, cx, cy);
renderContext.beginPath();
renderContext.moveTo(topLeft[0] * pixelRatio + ox, topLeft[1] * pixelRatio + oy);
renderContext.lineTo(topRight[0] * pixelRatio + ox, topRight[1] * pixelRatio + oy);
renderContext.lineTo(bottomRight[0] * pixelRatio + ox, bottomRight[1] * pixelRatio + oy);
renderContext.lineTo(bottomLeft[0] * pixelRatio + ox, bottomLeft[1] * pixelRatio + oy);
renderContext.moveTo(drawScale * (topLeft[0] * pixelRatio + ox),
drawScale * (topLeft[1] * pixelRatio + oy));
renderContext.lineTo(drawScale * (topRight[0] * pixelRatio + ox),
drawScale * (topRight[1] * pixelRatio + oy));
renderContext.lineTo(drawScale * (bottomRight[0] * pixelRatio + ox),
drawScale * (bottomRight[1] * pixelRatio + oy));
renderContext.lineTo(drawScale * (bottomLeft[0] * pixelRatio + ox),
drawScale * (bottomLeft[1] * pixelRatio + oy));
renderContext.clip();
ol.render.canvas.rotateAtOffset(renderContext, rotation, cx, cy);
}