因需要 要实现一个类似彩票走势图的功能，初次学Html5 ，很多地方不明白，前段时间也发帖请教过这个问题，也是没给个明确说话，在网上搜了很多，也没有实现的例子，今天仔细研究了下，发现其实也不是很难，现将代码贴出来，共同学习！
先来一张效果图：
实现的代码：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script src="js/jquery-1.10.2.js"></script>
<style>
table { border: 0; margin: 0; border-collapse: collapse; border-spacing: 0; font-size: 11px; font-family: Arial; margin: 0 auto; }
table td, table th { padding: 0; border: 1px solid #d8d8d8; height: 23px; width: 23px; text-align: center; color: #666; }
table th { font-weight: bold; color: #000; }
</style>
<script type="text/javascript">
$(function () {
CreateTable();
var ids = "";
for (var i = 1; i < 31; i++) {
ids+= "T" + i + "_" + Math.floor(1 + Math.random() * (31 - 1)) + ",";
}
ids = ids.substring(0, ids.length - 1);
CreateLine(ids, 20, "#ff6600", "canvasdiv", "#d5d5d5");
});
function CreateTable() {
var tbody = "";
var head = "<tr>";
for (var i = 1; i < 31; i++) {
head += "<th>H" + i + "</th>";
tbody += "<tr>";
for (var j = 1; j < 31; j++) {
tbody += "<td id='T" + i + "_" + j + "'>" + j + "</td>";
}
tbody += "</tr>";
}
head += "</tr>";
$("#zstable thead").html(head);
$("#zstable tbody").html(tbody);
}
function CreateLine(ids, w, c, div, bg) {
var list = ids.split(",");
for (var j = list.length - 1; j > 0; j--) {
var tid = $("#" + list[j]);
var fid = $("#" + list[j - 1]);
var f_width = fid.outerWidth();
var f_height = fid.outerHeight();
var f_offset = fid.offset();
var f_top = f_offset.top;
var f_left = f_offset.left;
var t_offset = tid.offset();
var t_top = t_offset.top;
var t_left = t_offset.left;
var cvs_left = Math.min(f_left, t_left);
var cvs_top = Math.min(f_top, t_top);
tid.css("background", bg).css("color", "red");
fid.css("background", bg).css("color", "red");
var cvs = document.createElement("canvas");
cvs.width = Math.abs(f_left - t_left) < w ? w : Math.abs(f_left - t_left);
cvs.height = Math.abs(f_top - t_top);
cvs.style.top = cvs_top + parseInt(f_height / 2) + "px";
cvs.style.left = cvs_left + parseInt(f_width / 2) + "px";
cvs.style.position = "absolute";
var cxt = cvs.getContext("2d");
cxt.save();
cxt.strokeStyle = c;
cxt.lineWidth = 1;
cxt.lineJoin = "round";
cxt.beginPath();
cxt.moveTo(f_left - cvs_left, f_top - cvs_top);
cxt.lineTo(t_left - cvs_left, t_top - cvs_top);
cxt.closePath();
cxt.stroke();
cxt.restore();
$("#" + div).append(cvs);
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<table id="zstable">
<thead></thead>
<tbody></tbody>
</table>
<div id="canvasdiv">
</div>
</form>
</body>
</html>
Html5 canvas 绘制彩票走势图
时间： 2024-10-27 08:52:09