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h5_1_class_grid.html
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<!doctype html>
<html lang="zh_cn">
<head>
<meta charset="UTF-8">
<title>H5 CANVAS Class Grid</title>
<style type="text/css">
canvas {
border: 1px solid #c1c1c1c;
display: block;
}
#canvas1{
border: 1px solid #ffc1c1;
}
</style>
</head>
<body>
<canvas id="canvas1" width="700" height="700">您的浏览器版本低无法支持CANVAS</canvas>
<script type="text/javascript">
window.onload = function(){
//init
var canvas1 = document.getElementById("canvas1");
var ctx1 = canvas1.getContext('2d');
drawGrid( canvas1.width, canvas1.height, ctx1, 20, 20 );
}
/*
* 根据指定的width跟height来自动绘制网格
* width 画布的宽度，默认浏览器可视区域宽度
* height 画布的高度，默认浏览器可视区域高度
* ctx 画布对象，默认获取ID为canvas-grid画布
* row 网格行，默认2行
* column 网格列，默认2列
*/
function drawGrid( width, height, ctx, row, column ){
console.log( 'width = '+width+', height = '+height+', ctx = '+ctx+', row = '+row+', column = '+column );
if( ctx == undefined ){
ctx = document.getElementById('canvas-grid');
if( ctx == undefined ){alert('ERROR : NOT HAVE CANVAS OBJECT');return false;}
this.ctx = ctx.getContext('2d');
}else this.ctx = ctx;
var w = width || document.body.clientWidth,
h = height || document.body.clientHeight,
row = row || 2,
column = column || 2;
var rowW = w / row,
rowH = h / column;
var dX = 0,
dY = 0;
//
console.log( 'width = '+w+', height = '+h+', , row = '+row+', column = '+column+', rowW = '+rowW+', rowH = '+rowH );
//
with( ctx ){
strokeStyle = 'rgba( 11,11,11,0.1)';
lineWidth = 1;
}
//
for( var i = 1;i< column;i++ ){
console.log( 'ID : ' + i + '; x : ' + 0 + '; y : ' + rowH * i );
dX = rowH * i;
with( ctx ){
beginPath();
moveTo( 0, dX );
lineTo( w, dX );
stroke();
}
}
for( var j = 1;j< row;j++ ){
console.log( 'ID : ' + i + '; x : ' + rowW * j + '; y : ' + 0 );
dY = rowW * j;
with( ctx ){
beginPath();
moveTo( dY, 0 );
lineTo( dY, h );
stroke();
}
}
}
</script>
</body>
</html>