ab6a96a991
Certain examples rely extensively on the originating PhantomJS examples. This patch fixes license headers of these examples to mention PhantomJS authors.
72 lines
2.4 KiB
JavaScript
72 lines
2.4 KiB
JavaScript
/**
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* Copyright 2017 Google Inc., PhantomJS Authors All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var Browser = require('../lib/Browser');
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var browser = new Browser();
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browser.newPage().then(async page => {
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await page.setSize({width: 400, height: 400});
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await page.setContent('<html><body><canvas id="surface"></canvas></body></html>');
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await page.evaluate(drawColorWheel);
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await page.saveScreenshot('colorwheel.png');
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browser.close();
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});
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function drawColorWheel() {
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var el = document.getElementById('surface'),
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context = el.getContext('2d'),
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width = window.innerWidth,
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height = window.innerHeight,
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cx = width / 2,
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cy = height / 2,
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radius = width / 2.3,
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imageData,
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pixels,
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hue, sat, value,
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i = 0, x, y, rx, ry, d,
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f, g, p, u, v, w, rgb;
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el.width = width;
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el.height = height;
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imageData = context.createImageData(width, height);
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pixels = imageData.data;
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for (y = 0; y < height; y = y + 1) {
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for (x = 0; x < width; x = x + 1, i = i + 4) {
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rx = x - cx;
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ry = y - cy;
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d = rx * rx + ry * ry;
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if (d < radius * radius) {
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hue = 6 * (Math.atan2(ry, rx) + Math.PI) / (2 * Math.PI);
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sat = Math.sqrt(d) / radius;
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g = Math.floor(hue);
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f = hue - g;
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u = 255 * (1 - sat);
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v = 255 * (1 - sat * f);
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w = 255 * (1 - sat * (1 - f));
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pixels[i] = [255, v, u, u, w, 255, 255][g];
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pixels[i + 1] = [w, 255, 255, v, u, u, w][g];
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pixels[i + 2] = [u, u, w, 255, 255, v, u][g];
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pixels[i + 3] = 255;
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}
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}
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}
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context.putImageData(imageData, 0, 0);
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document.body.style.backgroundColor = 'white';
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document.body.style.margin = '0px';
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}
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