Avoid loading tiles outside the grid extent

This commit is contained in:
Tim Schaub
2021-11-29 10:55:55 -07:00
parent a788c9bd1e
commit 3bf1aef8e2
8 changed files with 86 additions and 7 deletions

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After

Width:  |  Height:  |  Size: 97 KiB

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@@ -0,0 +1,63 @@
import DataTile from '../../../../src/ol/source/DataTile.js';
import Map from '../../../../src/ol/Map.js';
import TileLayer from '../../../../src/ol/layer/WebGLTile.js';
import View from '../../../../src/ol/View.js';
import XYZ from '../../../../src/ol/source/XYZ.js';
const labelCanvasSize = 256;
const labelCanvas = document.createElement('canvas');
labelCanvas.width = labelCanvasSize;
labelCanvas.height = labelCanvasSize;
const labelContext = labelCanvas.getContext('2d');
labelContext.textAlign = 'center';
labelContext.font = '16px sans-serif';
const labelLineHeight = 16;
new Map({
layers: [
new TileLayer({
source: new XYZ({
url: '/data/tiles/satellite/{z}/{x}/{y}.jpg',
transition: 0,
}),
}),
new TileLayer({
source: new DataTile({
loader: function (z, x, y) {
const half = labelCanvasSize / 2;
labelContext.clearRect(0, 0, labelCanvasSize, labelCanvasSize);
labelContext.fillStyle = 'white';
labelContext.fillText(`z: ${z}`, half, half - labelLineHeight);
labelContext.fillText(`x: ${x}`, half, half);
labelContext.fillText(`y: ${y}`, half, half + labelLineHeight);
labelContext.strokeStyle = 'white';
labelContext.lineWidth = 2;
labelContext.strokeRect(0, 0, labelCanvasSize, labelCanvasSize);
const data = labelContext.getImageData(
0,
0,
labelCanvasSize,
labelCanvasSize
).data;
return new Uint8Array(data.buffer);
},
transition: 0,
}),
}),
],
target: 'map',
view: new View({
center: [15700000, 2700000],
zoom: 2,
}),
});
render({
message: 'data tiles outside the world are not rendered',
});

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@@ -46,6 +46,7 @@ new Map({
}),
new TileLayer({
source: new DataTile({
wrapX: true,
loader: function (z, x, y) {
const half = labelCanvasSize / 2;

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@@ -44,6 +44,7 @@ new Map({
}),
new TileLayer({
source: new DataTile({
wrapX: true,
loader: function (z, x, y) {
const half = labelCanvasSize / 2;