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scale up and round to avoid rounding errors

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This commit is contained in:
mike-000
2021-06-09 12:52:09 +01:00
committed by GitHub
parent 0722786857
commit c0580262f1
1 changed files with 13 additions and 4 deletions
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17
src/ol/source/ImageStatic.js
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@@ -135,10 +135,19 @@ class Static extends ImageSource {
imageWidth = image.width;
imageHeight = image.height;
}
const resolution = getHeight(imageExtent) / imageHeight;
const targetWidth = Math.ceil(getWidth(imageExtent) / resolution);
if (targetWidth != imageWidth) {
const context = createCanvasContext2D(targetWidth, imageHeight);
const extentWidth = getWidth(imageExtent);
const extentHeight = getHeight(imageExtent);
const xResolution = extentWidth / imageWidth;
const yResolution = extentHeight / imageHeight;
let targetWidth = imageWidth;
let targetHeight = imageHeight;
if (xResolution > yResolution) {
targetWidth = Math.round(extentWidth / yResolution);
} else {
targetHeight = Math.round(extentHeight / xResolution);
}
if (targetWidth !== imageWidth || targetHeight !== imageHeight) {
const context = createCanvasContext2D(targetWidth, targetHeight);
assign(context, this.getContextOptions());
const canvas = context.canvas;
context.drawImage(