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Merge pull request #6345 from giohappy/wms_getmap_rounding

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Mitigate rounding errors in GetMap width/height calculation
This commit is contained in:
Andreas Hocevar
2017-01-11 00:12:58 +01:00
committed by GitHub
parent bb29102e73 d0e97df348
commit 0bf94a35a4
1 changed files with 15 additions and 6 deletions
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src/ol/source/imagewms.js
+15 -6
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@@ -194,8 +194,16 @@ ol.source.ImageWMS.prototype.getImageInternal = function(extent, resolution, pix
var centerY = (extent[1] + extent[3]) / 2; var centerY = (extent[1] + extent[3]) / 2;
var imageResolution = resolution / pixelRatio; var imageResolution = resolution / pixelRatio;
var imageWidth = ol.extent.getWidth(extent) / imageResolution; var imageWidth = Math.ceil(ol.extent.getWidth(extent) / imageResolution);
var imageHeight = ol.extent.getHeight(extent) / imageResolution; var imageHeight = Math.ceil(ol.extent.getHeight(extent) / imageResolution);
var halfWidth = imageWidth * imageResolution / 2;
var halfHeight = imageHeight * imageResolution / 2;
extent[0] = centerX - halfWidth;
extent[1] = centerY - halfHeight;
extent[2] = centerX + halfWidth;
extent[3] = centerY + halfHeight;
var image = this.image_; var image = this.image_;
if (image && if (image &&
@@ -207,8 +215,9 @@ ol.source.ImageWMS.prototype.getImageInternal = function(extent, resolution, pix
} }
if (this.ratio_ != 1) { if (this.ratio_ != 1) {
var halfWidth = this.ratio_ * ol.extent.getWidth(extent) / 2; halfWidth *= this.ratio_;
var halfHeight = this.ratio_ * ol.extent.getHeight(extent) / 2; halfHeight *= this.ratio_;
extent[0] = centerX - halfWidth; extent[0] = centerX - halfWidth;
extent[1] = centerY - halfHeight; extent[1] = centerY - halfHeight;
extent[2] = centerX + halfWidth; extent[2] = centerX + halfWidth;
@@ -224,8 +233,8 @@ ol.source.ImageWMS.prototype.getImageInternal = function(extent, resolution, pix
}; };
ol.obj.assign(params, this.params_); ol.obj.assign(params, this.params_);
this.imageSize_[0] = Math.ceil(imageWidth * this.ratio_); this.imageSize_[0] = imageWidth * this.ratio_;
this.imageSize_[1] = Math.ceil(imageHeight * this.ratio_); this.imageSize_[1] = imageHeight * this.ratio_;
var url = this.getRequestUrl_(extent, this.imageSize_, pixelRatio, var url = this.getRequestUrl_(extent, this.imageSize_, pixelRatio,
projection, params); projection, params);