69 lines
2.6 KiB
JavaScript
69 lines
2.6 KiB
JavaScript
import {getPixelIndexArray} from '../../../../../../src/ol/render/canvas/ExecutorGroup.js';
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describe('ol.render.canvas.ExecutorGroup', function () {
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describe('#getPixelIndexArray', function () {
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it('creates an array with every index within distance', function () {
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const radius = 10;
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const size = radius * 2 + 1;
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const hitIndexes = getPixelIndexArray(radius);
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const circleArray = new Array(size);
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for (let i = 0; i < size; i++) {
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circleArray[i] = new Array(size);
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}
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hitIndexes.forEach(function (d) {
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const x = ((d - 3) / 4) % size;
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const y = ((d - 3) / 4 / size) | 0;
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circleArray[x][y] = true;
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});
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const minRadiusSq = Math.pow(radius - Math.SQRT2, 2);
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const maxRadiusSq = Math.pow(radius + Math.SQRT2, 2);
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expect(circleArray.length).to.be(size);
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for (let i = 0; i < size; i++) {
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expect(circleArray[i].length).to.be(size);
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for (let j = 0; j < size; j++) {
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const dx = Math.abs(radius - i);
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const dy = Math.abs(radius - j);
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const distanceSq = Math.pow(dx, 2) + Math.pow(dy, 2);
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if (circleArray[i][j] === true) {
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expect(distanceSq).to.be.within(0, maxRadiusSq);
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} else {
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expect(distanceSq).to.be.within(minRadiusSq, Infinity);
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}
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}
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}
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});
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it('orders the indexes correctly from closest to farthest away', function () {
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const radius = 10;
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const size = radius * 2 + 1;
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const hitIndexes = getPixelIndexArray(radius);
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// Center first
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expect(hitIndexes[0]).to.be((size * radius + radius) * 4 + 3);
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// 4 Pixels above/below/left/right of center next
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const begin = hitIndexes.slice(1, 5);
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expect(begin).to.contain((radius * size + radius + 1) * 4 + 3);
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expect(begin).to.contain(((radius + 1) * size + radius) * 4 + 3);
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expect(begin).to.contain(((radius - 1) * size + radius) * 4 + 3);
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expect(begin).to.contain((radius * size + radius - 1) * 4 + 3);
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// 4 Pixels in the middle of each side in the last 12 elements (at radius 10)
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const last = hitIndexes.slice(hitIndexes.length - 12);
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expect(last).to.contain((0 * size + radius) * 4 + 3);
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expect(last).to.contain((radius * size + 0) * 4 + 3);
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expect(last).to.contain((radius * size + size - 1) * 4 + 3);
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expect(last).to.contain(((size - 1) * size + radius) * 4 + 3);
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});
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it('has no duplicate indexes', function () {
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const radius = 10;
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const hitIndexes = getPixelIndexArray(radius);
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expect(new Set(hitIndexes).size).to.be(hitIndexes.length);
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});
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});
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});
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