Make a simple sketchpad code using JS and html
Today I will teach you how to make a small program, using CSS3, H5 and JS to make a fun simple drawing board. Friends who are interested can try it. The code is posted below. Everyone can also use their creativity to change some functions.
html：
<body>
<canvas width="800" height="600" id="c1">
<span>
</span>
</canvas>
<ul id="ul1">
<li>颜色版：<input id="color" type="color"/></li>
<li>笔触：<input id="num" type="number" min="0" max="100"/></li>
<li></li>
</ul>
</body>
css：
<style>
*{ margin:0; padding:0;}
body{ background:#000;}
canvas{ background:#fff; float:left;}
span{ color:#fff; font-size:80px;}
#ul1{width:100px;height:600px; float:left; background:#ccc;}
</style>
javascript:
<script>
window.onload=function(){
var oC=document.getElementById('c1');
var oColor=document.getElementById('color');
var oNum=document.getElementById('num');
var gd=oC.getContext('2d');//画笔
oNum.onchange=function(){
gd.lineWidth = oNum.value;
strokeFn();
};
oColor.onchange=function(){
gd.strokeStyle = oColor.value;
strokeFn();
};
strokeFn();
function strokeFn(){
gd.beginPath();
oC.onmousedown=function(ev){
gd.moveTo(ev.clientX,ev.clientY);
oC.onmousemove=function(ev){
gd.lineTo(ev.clientX,ev.clientY);
gd.stroke();
};
oC.onmouseup=function(){
oC.onmousemove=oC.onmouseup=null;
};
return false;
};
}
};
</script>I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!
Related reading:
How to change the mouseover style without using CSS
How to use CSS to create an image rotation effect
How to optimize HTML web pages
The above is the detailed content of Make a simple sketchpad code using JS and html. For more information, please follow other related articles on the PHP Chinese website!
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