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Fix feature lookup after removal of alpha

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This commit is contained in:
Andreas Hocevar
2019-11-18 08:56:20 +01:00
parent f784fe6e42
commit d0b4967ec0
1 changed files with 6 additions and 6 deletions
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12
src/ol/render/canvas/hitdetect.js
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@@ -33,10 +33,10 @@ export function createHitDetectionImageData(size, transforms, features, styleFun
const renderer = new CanvasImmediateRenderer(context, 0.5, extent, null, rotation); const renderer = new CanvasImmediateRenderer(context, 0.5, extent, null, rotation);
const featureCount = features.length; const featureCount = features.length;
// Stretch hit detection index to use the whole available color range // Stretch hit detection index to use the whole available color range
const indexFactor = Math.ceil((256 * 256 * 256) / featureCount); const indexFactor = Math.ceil((256 * 256 * 256 - 1) / featureCount);
const featuresByZIndex = {}; const featuresByZIndex = {};
for (let i = 0; i < featureCount; ++i) { for (let i = 1; i <= featureCount; ++i) {
const feature = features[i]; const feature = features[i - 1];
const featureStyleFunction = feature.getStyleFunction() || styleFunction; const featureStyleFunction = feature.getStyleFunction() || styleFunction;
if (!styleFunction) { if (!styleFunction) {
continue; continue;
@@ -141,9 +141,9 @@ export function hitDetect(pixel, features, imageData) {
const g = imageData.data[index + 1]; const g = imageData.data[index + 1];
const b = imageData.data[index + 2]; const b = imageData.data[index + 2];
const i = b + (256 * (g + (256 * r))); const i = b + (256 * (g + (256 * r)));
const indexFactor = Math.ceil((256 * 256 * 256) / features.length); const indexFactor = Math.ceil((256 * 256 * 256 - 1) / features.length);
if (i % indexFactor === 0) { if (i && i % indexFactor === 0) {
resultFeatures.push(features[i / indexFactor]); resultFeatures.push(features[i / indexFactor - 1]);
} }
} }
return resultFeatures; return resultFeatures;