Html5 canvas黑客帝國文字瀑布效果
阿新 • • 發佈：2019-02-01
Html程式碼如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>黑客帝國文字瀑布</title> <style type="text/css"> /*basic reset*/ * {margin: 0; padding: 0;} /*adding a black bg to the body to make things clearer*/ body {background: black;} canvas {display: block;} </style> </head> <body> <canvas id="c"></canvas> <script type="text/javascript"> var c = document.getElementById("c"); var ctx = c.getContext("2d"); //making the canvas full screen c.height = window.innerHeight; c.width = window.innerWidth; //chinese characters - taken from the unicode charset var chinese = "I Love You！"; //converting the string into an array of single characters chinese = chinese.split(""); var font_size = 10; var columns = c.width / font_size; //number of columns for the rain //an array of drops - one per column var drops = []; //x below is the x coordinate //1 = y co-ordinate of the drop(same for every drop initially) for (var x = 0; x < columns; x++) drops[x] = 1; //drawing the characters function draw() { //Black BG for the canvas //translucent BG to show trail ctx.fillStyle = "rgba(0, 0, 0, 0.05)"; ctx.fillRect(0, 0, c.width, c.height); ctx.fillStyle = "#0F0"; //green text ctx.font = font_size + "px arial"; //looping over drops for (var i = 0; i < drops.length; i++) { //a random chinese character to print var text = chinese[Math.floor(Math.random() * chinese.length)]; //x = i*font_size, y = value of drops[i]*font_size ctx.fillText(text, i * font_size, drops[i] * font_size); //sending the drop back to the top randomly after it has crossed the screen //adding a randomness to the reset to make the drops scattered on the Y axis if (drops[i] * font_size > c.height && Math.random() > 0.975) drops[i] = 0; //incrementing Y coordinate drops[i]++; } } setInterval(draw, 50); </script> </body> </html>
效果如圖：
