HTML5 Canvas 画纸飞机组件

时间：2022-03-26 17:09:43

纸飞机模拟一个物体在规定设计轴线偏离方位。

 //三角形

 function DrawTriangle(canvas, A, B, C) {

     //画个三角形,“A、B、C”是顶点

     with (canvas) {

         moveTo(A[0], A[1]);

         lineTo(B[0], B[1]);

         lineTo(C[0], C[1]);

         lineTo(A[0], A[1]);

     }

 }

 // 画纸飞机

 //headx,heady 纸飞机头坐标

 //footx,footy 纸飞机尾巴坐标

 function DrawDarts(canvas, headx, heady, footx, footy) {

     var c = document.getElementById(canvas);

     var cxt = c.getContext("2d");

     //半径 R

     var R = 150;

     //转换头坐标

     var headx1 = R + headx;

     var heady1 = R - heady;

     //转换尾坐标

     var footx1 = R + footx;

     var footy1 = R - footy;

     //左尾

     var footxl = R + (footx - 50);

     var footyl = R - footy;

     //右尾

     var footxr = R + (footx + 50);

     var footyr = R - footy;

     //上尾

     var footxu = R + footx;

     var footyu = R - (footy - 50);

     //下尾

     var footxd = R + footx;

     var footyd = R - (footy + 50);

     //判断头x和尾x的大小

     cxt.beginPath();

     cxt.strokeStyle = "black";

     cxt.fillStyle = "#6C8D9F";

     var A = new Array(headx1, heady1);

     var B = new Array(footx1, footy1);

     //  alert(headx1);

     //  alert(footx1);

     if (parseInt(headx1) - parseInt(footx1) <= 0)

         var C = new Array(footxr, footyr);

     else

         var C = new Array(footxl, footyl);

     DrawTriangle(cxt, A, B, C);

     cxt.fill();

     cxt.closePath();

     cxt.stroke();

     //画头、上、下尾巴 形成的三角形

     cxt.beginPath();

     cxt.strokeStyle = "black";

     cxt.fillStyle = "#6C8D9F";

     var A1 = new Array(headx1, heady1);

     var B1 = new Array(footxu, footyu);

     var C1 = new Array(footxd, footyd);

     DrawTriangle(cxt, A1, B1, C1);

     cxt.fill();

     cxt.closePath();

     cxt.stroke();

     cxt.beginPath();

     cxt.strokeStyle = "black";

     cxt.fillStyle = "#6C8D9F";

     var A2 = new Array(headx1, heady1);

     var B2 = new Array(footx1, footy1);

     if (parseInt(headx1) - parseInt(footx1) <= 0)

         var C2 = new Array(footxl, footyl);

     else

         var C2 = new Array(footxr, footyr);

     DrawTriangle(cxt, A2, B2, C2);

     cxt.fill();

     cxt.closePath();

     cxt.stroke();

 }

html 页面调用

<!DOCTYPE HTML>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>HTML Canvas 画纸飞机</title>

<script type="text/javascript" src="Darts.js"></script>

</head>

<body>

    <canvas id="can" width="300" height="300" style="border: 1px solid #00F">浏览器不支持HTML5！</canvas>

    <script type="text/javascript" charset="utf-8">

        DrawDarts("can", -10, 10, 30, -30)

    </script>

</body>

</html>

预览效果图

HTML5 Canvas 画纸飞机组件

效果图2：

HTML5 Canvas 画纸飞机组件

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