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Do not exceed color range

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This commit is contained in:
Andreas Hocevar
2020-02-17 21:10:29 +01:00
parent bf38796ec7
commit 07b02fe947
2 changed files with 36 additions and 2 deletions
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5
src/ol/render/canvas/hitdetect.js
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@@ -33,7 +33,7 @@ export function createHitDetectionImageData(size, transforms, features, styleFun
const renderer = new CanvasImmediateRenderer(context, 0.5, extent, null, rotation);
const featureCount = features.length;
// Stretch hit detection index to use the whole available color range
const indexFactor = Math.ceil((256 * 256 * 256 - 1) / featureCount);
const indexFactor = Math.floor((256 * 256 * 256 - 1) / featureCount);
const featuresByZIndex = {};
for (let i = 1; i <= featureCount; ++i) {
const feature = features[i - 1];
@@ -121,6 +121,7 @@ export function createHitDetectionImageData(size, transforms, features, styleFun
}
}
}
document.body.appendChild(context.canvas);
return context.getImageData(0, 0, canvas.width, canvas.height);
}
@@ -141,7 +142,7 @@ export function hitDetect(pixel, features, imageData) {
const g = imageData.data[index + 1];
const b = imageData.data[index + 2];
const i = b + (256 * (g + (256 * r)));
const indexFactor = Math.ceil((256 * 256 * 256 - 1) / features.length);
const indexFactor = Math.floor((256 * 256 * 256 - 1) / features.length);
if (i && i % indexFactor === 0) {
resultFeatures.push(features[i / indexFactor - 1]);
}