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Fewer calls to the color callback

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This commit is contained in:
Tim Schaub
2019-04-19 13:49:53 -07:00
parent 440ae897a5
commit 154265a2d9
3 changed files with 44 additions and 35 deletions
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examples/icon-sprite-webgl.js
+8 -7
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@@ -38,16 +38,17 @@ class WebglPointsLayer extends VectorLayer {
createRenderer() {
return new WebGLPointsLayerRenderer(this, {
texture: texture,
colorCallback: function(feature, vertex, component) {
// component at index 3 is alpha
if (component === 3) {
return 1;
}
colorCallback: function(feature, vertex, color) {
// color is interpolated based on year (min is 1910, max is 2013)
// please note: most values are between 2000-2013
const ratio = (feature.get('year') - 1950) / (2013 - 1950);
return lerp(oldColor[component], newColor[component], ratio * ratio) / 255;
color[0] = lerp(oldColor[0], newColor[0], ratio * ratio) / 255;
color[1] = lerp(oldColor[1], newColor[1], ratio * ratio) / 255;
color[2] = lerp(oldColor[2], newColor[2], ratio * ratio) / 255;
color[3] = 1;
return color;
},
texCoordCallback: function(feature, component) {
let coords = shapeTextureCoords[feature.get('shape')];