HTMLcanvas rectangle shower
HTMLcanvasRectangle Shower
Execute on canvas
Get the drawing environment
Get full screen Screen Width and Screen Height
Determine the width of each text to determine the columns
LoopOutput
TimerCall
##HTML part
<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>HTMLcanvas矩形阵雨</title></head><body><canvas id="c">您的浏览器不支持 请升级</canvas></body></html>
CSS Part
<style type="text/css">/* 基本的复位 */* {
margin:0;
padding:0;}/* 给body一个背景 使画布看起来更清晰 */body {
background-color:#000;}canvas {
display:block;}</style><script type="text/jscript">
var c = document.getElementById("c"); //获取id
var ctx = c.getContext("2d"); //2d制图
c.width = window.innerWidth; //获取屏幕宽度 c.height = window.innerHeight; //获取屏幕高度
var chinese = "abcdefghijklmnopqrstuvwxyz"; //canvas 阵雨文字 chinese = chinese.split(""); //split 分离
var font_size = 10; //字体大小 10px
var columns = c.width/font_size;
//获取列 屏幕宽度/字体大小
var drops = []; // drop 落下 新建数组
for(n=0; n < columns; n++) //控制列输出 drops[n] = 1; //draw
function draw(){
ctx.fillStyle = "rgba(0,0,0,0.05)"; //绘制矩形 ctx.fillRect(0,0,c.width,c.height); //以(0,0)为坐标 画制矩形
ctx.fillStyle = "#0F0"; //绿色字体 ctx.font = font_size + "px arial"; //以像素为单位 宋体
for(var i=0; i< drops.length; i++)
{ var text = chinese[Math.floor(Math.random()*chinese.length)]; // Math.floor 对浮点数向下取整 ctx.fillText(text, i*font_size, drops[i]*font_size); // 规定在画布上输出的文本 开始绘制文本的x坐标 y坐标
if(drops[i]*font_size > c.height && Math.random() > 0.975) // 如果下落的文本大于屏幕高度 或者 随机数大于0.975 drops[i] = 0; // 重置下落 drops[i]++; // 继续执行 }
}
setInterval(draw,33); //33 执行一次draw()</script>This article ends here
I always believe that this world is full of beauty and Hope to come on!
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