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Use pixel rounded center for the WebGL renderer transform

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This commit is contained in:
Andreas Hocevar
2016-09-26 13:28:09 +02:00
parent 9950e97c54
commit 3026fda02b
2 changed files with 3 additions and 25 deletions
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15
src/ol/renderer/layer.js
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@@ -254,21 +254,6 @@ ol.renderer.Layer.prototype.updateUsedTiles = function(usedTiles, tileSource, z,
};
/**
* @param {ol.Coordinate} center Center.
* @param {number} resolution Resolution.
* @param {ol.Size} size Size.
* @protected
* @return {ol.Coordinate} Snapped center.
*/
ol.renderer.Layer.prototype.snapCenterToPixel = function(center, resolution, size) {
return [
resolution * (Math.round(center[0] / resolution) + (size[0] % 2) / 2),
resolution * (Math.round(center[1] / resolution) + (size[1] % 2) / 2)
];
};
/**
* Manage tile pyramid.
* This function performs a number of functions related to the tiles at the

13
src/ol/renderer/webgl/tilelayer.js
View File

@@ -164,14 +164,7 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame = function(frameState, layerS
var tileGutter = frameState.pixelRatio * tileSource.getGutter(projection);
var center = viewState.center;
var extent;
if (tileResolution == viewState.resolution) {
center = this.snapCenterToPixel(center, tileResolution, frameState.size);
extent = ol.extent.getForViewAndSize(
center, tileResolution, viewState.rotation, frameState.size);
} else {
extent = frameState.extent;
}
var extent = frameState.extent;
var tileRange = tileGrid.getTileRangeForExtentAndResolution(
extent, tileResolution);
@@ -346,9 +339,9 @@ ol.renderer.webgl.TileLayer.prototype.prepareFrame = function(frameState, layerS
var texCoordMatrix = this.texCoordMatrix;
ol.transform.reset(texCoordMatrix);
ol.transform.translate(texCoordMatrix,
(center[0] - framebufferExtent[0]) /
(Math.round(center[0] / tileResolution) * tileResolution - framebufferExtent[0]) /
(framebufferExtent[2] - framebufferExtent[0]),
(center[1] - framebufferExtent[1]) /
(Math.round(center[1] / tileResolution) * tileResolution - framebufferExtent[1]) /
(framebufferExtent[3] - framebufferExtent[1]));
if (viewState.rotation !== 0) {
ol.transform.rotate(texCoordMatrix, viewState.rotation);