<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>plasma.js Example File | Qt Script</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtscript-index.html">Qt Script</a></td><td ><a href="qtscript-script-context2d-example.html">Context2D Example</a></td><td >plasma.js Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtscript-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">plasma.js Example File</h1> <span class="subtitle">script/context2d/scripts/plasma.js</span> <!-- $$$script/context2d/scripts/plasma.js-description --> <div class="descr"> <a name="details"></a> <pre class="js"> var counter = 0; var PIXEL_SIZE = 4; var temp_1 = 0; function init() { setInterval('render()',50); } function dist(a, b, c, d) { return Math.sqrt((a - c) * (a - c) + (b - d) * (b - d)); } function render() { var canvas = document.getElementById('tutorial'); canvas.resize(128, 128); var ctx = canvas.getContext('2d'); ctx.save(); var time = counter * 5; for( y = 0; y < 128; y+=PIXEL_SIZE) { for( x = 0 ; x < 128; x+=PIXEL_SIZE) { var temp_val = Math.floor(Math.sin(dist(x + time, y, 128.0, 128.0) / 8.0) + Math.sin(dist(x, y, 64.0, 64.0) / 8.0) + Math.sin(dist(x, y + time / 7, 192.0, 64) / 7.0) + Math.sin(dist(x, y, 192.0, 100.0) / 8.0)); var temp_col = Math.floor((2 + temp_val) * 50); var rand_red = temp_col * 3; var rand_green = temp_col ; var rand_blue = 128 - temp_col; ctx.fillStyle = "rgb("+rand_red+","+rand_green+","+rand_blue+")"; ctx.fillRect(x,y,PIXEL_SIZE,PIXEL_SIZE); } } ctx.restore(); counter++; } init(); </pre> </div> <!-- @@@script/context2d/scripts/plasma.js --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>