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Xiaoqiang’s HTML5 mobile development journey (10) – Online drawing board

黄舟Original: 2017-01-22 11:24:301484browse

In this article we use HTML5 to implement an online drawing board. Friends who have played You Draw and I Guess can also play a simple You Draw and I Guess mini game today. The effect is as shown in the figure below:

The process is very simple and can be directly coded:

<!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>大碗干拌的在线画板</title>  
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>  
<style type="text/css">  
#php100{ border:1px solid #ccc;}  
</style>  
</head>  
<body>  
<canvas id="php100" width="500" height="400"></canvas>  
  
<script type="text/javascript">  
 var canvas = document.getElementById(&#39;php100&#39;);  
 var p100=canvas.getContext("2d");  
     p100.lineWidth=5  
     p100.strokeStyle="red";  
       
 var paint=0;  
   
$("#php100").mousedown(function(e){  
  
  var mouseX = e.pageX - this.offsetLeft;  
  var mouseY = e.pageY - this.offsetTop;   
    
  paint=1;  
  p100.moveTo(mouseX,mouseY); //起始位置  
    
});  
  
$("#php100").mouseup(function(e){  
   paint=0;  
});  
  
$("#php100").mousemove(function(e){  
  var mouseX = e.pageX - this.offsetLeft;  
  var mouseY = e.pageY - this.offsetTop;   
  
    if(paint){  
        p100.lineTo(mouseX,mouseY); //终止位置  
        p100.stroke();              //结束图形  
      }  
    
});  
  
</script>  
</body>  
  
</html>

Interested friends can extend it and add a few buttons to change the color of the drawing board or other fun functions.

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