如何使用html5和(canvas或svg)绘制网格
San*_*mar 64 html5 svg html5-canvas
我想绘制一个如图所示的网格,但我完全不知道我应该从哪里开始.我应该使用SVG还是应该使用Canvas和HTML5以及如何绘制它.
请指导一下.我希望这个网格在其上绘制矩形,圆形或其他图表,我将计算该图的面积,如方形区域.
Tho*_*s W 128
SVG可以很好地使用模式:
<svg width="100%" height="100%" xmlns="http://www.w3.org/2000/svg">
<defs>
<pattern id="smallGrid" width="8" height="8" patternUnits="userSpaceOnUse">
<path d="M 8 0 L 0 0 0 8" fill="none" stroke="gray" stroke-width="0.5"/>
</pattern>
<pattern id="grid" width="80" height="80" patternUnits="userSpaceOnUse">
<rect width="80" height="80" fill="url(#smallGrid)"/>
<path d="M 80 0 L 0 0 0 80" fill="none" stroke="gray" stroke-width="1"/>
</pattern>
</defs>
<rect width="100%" height="100%" fill="url(#grid)" />
</svg>
我设置width和height对100%,所以你可以定义在实际使用中的宽度和高度,无论是联SVG:
<div style="width:400px;height:300px">
<svg width="100%" height="100%" xmlns="http://www.w3.org/2000/svg">
<defs>
<pattern id="smallGrid" width="8" height="8" patternUnits="userSpaceOnUse">
<path d="M 8 0 L 0 0 0 8" fill="none" stroke="gray" stroke-width="0.5"/>
</pattern>
<pattern id="grid" width="80" height="80" patternUnits="userSpaceOnUse">
<rect width="80" height="80" fill="url(#smallGrid)"/>
<path d="M 80 0 L 0 0 0 80" fill="none" stroke="gray" stroke-width="1"/>
</pattern>
</defs>
<rect width="100%" height="100%" fill="url(#grid)" />
</svg>
</div>
或<img>元素:
<img src="https://svgshare.com/i/9Eo.svg" width="700" height="200"/>
结果是:
<img src="https://svgshare.com/i/9Eo.svg" width="241" height="401"/>
结果是
请注意,对于此特定网格,如果希望网格以粗笔划开始和结束,则必须使用窗体的宽度和高度n x 80 + 1(具有n任意整数).
Tan*_*azi 10
我在canvas这里使用SO 发布我的代码,但我也在这里创建一个JSFiddle的工作示例.
<!DOCTYPE html>
<html>
<head>
<title>StackOverflow test bed</title>
<script type="text/javascript">
function drawGrid() {
var cnv = document.getElementById("cnv");
var gridOptions = {
minorLines: {
separation: 5,
color: '#00FF00'
},
majorLines: {
separation: 30,
color: '#FF0000'
}
};
drawGridLines(cnv, gridOptions.minorLines);
drawGridLines(cnv, gridOptions.majorLines);
return;
}
function drawGridLines(cnv, lineOptions) {
var iWidth = cnv.width;
var iHeight = cnv.height;
var ctx = cnv.getContext('2d');
ctx.strokeStyle = lineOptions.color;
ctx.strokeWidth = 1;
ctx.beginPath();
var iCount = null;
var i = null;
var x = null;
var y = null;
iCount = Math.floor(iWidth / lineOptions.separation);
for (i = 1; i <= iCount; i++) {
x = (i * lineOptions.separation);
ctx.moveTo(x, 0);
ctx.lineTo(x, iHeight);
ctx.stroke();
}
iCount = Math.floor(iHeight / lineOptions.separation);
for (i = 1; i <= iCount; i++) {
y = (i * lineOptions.separation);
ctx.moveTo(0, y);
ctx.lineTo(iWidth, y);
ctx.stroke();
}
ctx.closePath();
return;
}
</script>
</head>
<body onload="drawGrid()">
<canvas id="cnv" width="500" height="500"></canvas>
</body>
</html>
使用该canvas方法,您可以通过更改separation参数使网格大小动态化.
但是,如果您的网格大小是静态的,我觉得您可能不需要绘制网格.只是为了显示网格用户着想,你可以使用CSS来重复背景图像作为小提琴表现出在这里.这对页面性能也有好处.
为了覆盖范围,基于CSS的方法怎么样？
<!DOCTYPE html>
<html>
<head>
<style>
html {
height: 100%;
}
body {
margin: 0;
padding: 0;
height: 100%;
background-color: #434343;
background-size: 75px 75px;
background-image: linear-gradient(0deg, transparent 24%, rgba(255, 255, 255, .05) 25%, rgba(255, 255, 255, .05) 26%, transparent 27%, transparent 74%, rgba(255, 255, 255, .05) 75%, rgba(255, 255, 255, .05) 76%, transparent 77%, transparent), linear-gradient(90deg, transparent 24%, rgba(255, 255, 255, .05) 25%, rgba(255, 255, 255, .05) 26%, transparent 27%, transparent 74%, rgba(255, 255, 255, .05) 75%, rgba(255, 255, 255, .05) 76%, transparent 77%, transparent);
}
canvas {
width:100%;
height:100%;
position:absolute;
background-color: transparent;
background-size: 15px 15px;
background-image: linear-gradient(0deg, transparent 24%, rgba(255, 255, 255, .05) 25%, rgba(255, 255, 255, .05) 26%, transparent 27%, transparent 74%, rgba(255, 255, 255, .05) 75%, rgba(255, 255, 255, .05) 76%, transparent 77%, transparent), linear-gradient(90deg, transparent 24%, rgba(255, 255, 255, .05) 25%, rgba(255, 255, 255, .05) 26%, transparent 27%, transparent 74%, rgba(255, 255, 255, .05) 75%, rgba(255, 255, 255, .05) 76%, transparent 77%, transparent);
}
</style>
</head>
<body>
<canvas></canvas>
</body>
</html>
- 为上述答案添加了一个jsfiddle - https://jsfiddle.net/3pfc4avp/ (4认同)
| 归档时间： |
|
| 查看次数： |
44718 次 |
| 最近记录： |