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Make forward and inverse pixel transforms during render

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This commit is contained in:
Tim Schaub
2018-11-17 14:46:38 +01:00
parent db1f432197
commit 686847f491
5 changed files with 46 additions and 18 deletions
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src/ol/renderer/canvas/VectorLayer.js
+5 -4
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@@ -13,7 +13,7 @@ import CanvasBuilderGroup from '../../render/canvas/BuilderGroup.js';
import InstructionsGroupExecutor from '../../render/canvas/ExecutorGroup.js';
import CanvasLayerRenderer from './Layer.js';
import {defaultOrder as defaultRenderOrder, getTolerance as getRenderTolerance, getSquaredTolerance as getSquaredRenderTolerance, renderFeature} from '../vector.js';
import {toString as transformToString} from '../../transform.js';
import {toString as transformToString, makeScale, makeInverse} from '../../transform.js';
/**
* @classdesc
@@ -105,8 +105,9 @@ class CanvasVectorLayerRenderer extends CanvasLayerRenderer {
const pixelRatio = frameState.pixelRatio;
// a scale transform (we could add a createScale function in ol/transform)
const pixelTransform = [1 / pixelRatio, 0, 0, 1 / pixelRatio, 0, 0];
// set forward and inverse pixel transforms
makeScale(this.pixelTransform_, 1 / pixelRatio, 1 / pixelRatio);
makeInverse(this.pixelTransform_, this.inversePixelTransform_);
// resize and clear
const width = Math.round(frameState.size[0] * pixelRatio);
@@ -114,7 +115,7 @@ class CanvasVectorLayerRenderer extends CanvasLayerRenderer {
if (canvas.width != width || canvas.height != height) {
canvas.width = width;
canvas.height = height;
const canvasTransform = transformToString(pixelTransform);
const canvasTransform = transformToString(this.pixelTransform_);
if (canvas.style.transform !== canvasTransform) {
canvas.style.transform = canvasTransform;
}