ashatora/openlayers
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

scale up and round to avoid rounding errors

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files

17
src/ol/source/ImageStatic.js
View File

@@ -135,10 +135,19 @@ class Static extends ImageSource {
imageWidth = image.width; imageWidth = image.width;
imageHeight = image.height; imageHeight = image.height;
} }
const resolution = getHeight(imageExtent) / imageHeight; const extentWidth = getWidth(imageExtent);
const targetWidth = Math.ceil(getWidth(imageExtent) / resolution); const extentHeight = getHeight(imageExtent);
if (targetWidth != imageWidth) { const xResolution = extentWidth / imageWidth;
const context = createCanvasContext2D(targetWidth, imageHeight); 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()); assign(context, this.getContextOptions());
const canvas = context.canvas; const canvas = context.canvas;
context.drawImage( context.drawImage(