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webgl.html
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webgl.html
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<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=Edge"/>
<meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1.0, maximum-scale=1.0"/>
<!--apple-->
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<!--apple-->
<title>ChinaExcel HTML5 版</title>
<meta name="Description" content="采用HTML5技术来展现ChinaExcelWeb控件的所有功能，从而实现报表的跨平台应用，包括手机，平板电脑以及IPAD等移动终端上的业务需求。"/>
<link href="css/css.css" rel="stylesheet" />
<style type="text/css">
#showmessage{float: right;line-height: 25px; font-size: 14px;}
#canvas{float: left;position: relative;}
#main{float: left;}
#canvasshadow{position: absolute;left: 0px;top: 0px;}
</style>
</head>
<body style="width:1032px; margin:0px">
<div id="canvas" class="canvas"><canvas width=800 height=600 id="testcanvas"></canvas></div>
<button id="redraw">重绘</button>
<div id="showmessage"></div>
</body>
</html>
<script type="text/javascript">
function calcuteperformance(func){
var start = window.performance.now() ;
func();
var end = window.performance.now() ;
console.log(end-start);
}
calcuteperformance(function(){
var C={
colHeadWidth :64,
colHeadHeight : 27,
rowHeadWidth :50,
rowHeadHeight : 23,
rows : 12,
cols : 100,
width:819,
height:600,
YAXISWIDTH:1,
controls:{
KEY_UP :'moveUp',
KEY_LEFT :'moveLeft',
KEY_DOWN :'moveDown',
KEY_RIGHT :'moveRight',
KEY_ENTER :'SELECT',
KEY_SPACE :'SELECT',
CLICK :'SELECT',
TOUCHSTART :'SELECT',
MOUSEMOVE :'move',
TOUSHMOVE :'mouve',
TOUCHCANCEL :'end',
TOUCHEND :'end',
MOLUSEUP :'end'
}
};
function initWebGL(canvas) {
var gl = null;
try {
// Try to grab the standard context. If it fails, fallback to experimental.
gl = canvas.getContext("webgl") || canvas.getContext("experimental-webgl");
}
catch(e) {}
// If we don't have a GL context, give up now
if (!gl) {
alert("Unable to initialize WebGL. Your browser may not support it.");
gl = null;
}
return gl;
}
var gl = initWebGL(document.getElementById("testcanvas"));
for(var i=0;i<C.rows;i++){
for(var j=0,len = C.cols;j<len;j++){
drawRowColCell(i,j,String.fromCharCode(65+i)+j,gl);
}
}
function drawRowColCell(row,col,str,ctx){
var ctx = ctx;
var startX = 0.5;
var startY = 0.5;
startX += C.rowHeadWidth;
startY += C.colHeadHeight;
startX += C.colHeadWidth * row;
startY += C.rowHeadHeight * col;
ctx.strokeRect(startX, startY, C.colHeadWidth, C.rowHeadHeight);
drawText(startX+0.5, startY+0.5,C.colHeadWidth-1,C.rowHeadHeight-1,str,ctx);
}
function drawText(x,y,w,h,s,ctx){
ctx.fillStyle = "#222222";
ctx.textBaseline = 'middle';
ctx.textAlign = 'center';
ctx.font ="12px Arial, sans-serif";
ctx.fillText(s, x+w/2, y+h/2);
}
});
</script>