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Don't compute value more that once

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This commit is contained in:
Frederic Junod
2018-11-12 11:38:20 +01:00
parent 647421f07b
commit 5eed22286b
2 changed files with 12 additions and 14 deletions
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16
src/ol/renderer/canvas/Layer.js
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@@ -45,8 +45,8 @@ class CanvasLayerRenderer extends LayerRenderer {
*/
clip(context, frameState, extent) {
const pixelRatio = frameState.pixelRatio;
const width = frameState.size[0] * pixelRatio;
const height = frameState.size[1] * pixelRatio;
const halfWidth = (frameState.size[0] * pixelRatio) / 2;
const halfHeight = (frameState.size[1] * pixelRatio) / 2;
const rotation = frameState.viewState.rotation;
const topLeft = getTopLeft(extent);
const topRight = getTopRight(extent);
@@ -59,14 +59,14 @@ class CanvasLayerRenderer extends LayerRenderer {
applyTransform(frameState.coordinateToPixelTransform, bottomLeft);
context.save();
rotateAtOffset(context, -rotation, width / 2, height / 2);
rotateAtOffset(context, -rotation, halfWidth, halfHeight);
context.beginPath();
context.moveTo(topLeft[0] * pixelRatio, topLeft[1] * pixelRatio);
context.lineTo(topRight[0] * pixelRatio, topRight[1] * pixelRatio);
context.lineTo(bottomRight[0] * pixelRatio, bottomRight[1] * pixelRatio);
context.lineTo(bottomLeft[0] * pixelRatio, bottomLeft[1] * pixelRatio);
context.clip();
rotateAtOffset(context, rotation, width / 2, height / 2);
rotateAtOffset(context, rotation, halfWidth, halfHeight);
}
/**
@@ -79,10 +79,10 @@ class CanvasLayerRenderer extends LayerRenderer {
dispatchComposeEvent_(type, context, frameState, opt_transform) {
const layer = this.getLayer();
if (layer.hasListener(type)) {
const width = frameState.size[0] * frameState.pixelRatio;
const height = frameState.size[1] * frameState.pixelRatio;
const halfWidth = (frameState.size[0] * frameState.pixelRatio) / 2;
const halfHeight = (frameState.size[1] * frameState.pixelRatio) / 2;
const rotation = frameState.viewState.rotation;
rotateAtOffset(context, -rotation, width / 2, height / 2);
rotateAtOffset(context, -rotation, halfWidth, halfHeight);
const transform = opt_transform !== undefined ?
opt_transform : this.getTransform(frameState, 0);
const render = new CanvasImmediateRenderer(
@@ -91,7 +91,7 @@ class CanvasLayerRenderer extends LayerRenderer {
const composeEvent = new RenderEvent(type, render, frameState,
context, null);
layer.dispatchEvent(composeEvent);
rotateAtOffset(context, rotation, width / 2, height / 2);
rotateAtOffset(context, rotation, halfWidth, halfHeight);
}
}