+++ /dev/null
-<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" >
-<head>
-<title>Approximation of an arc with bezier</title>
-<style type="text/css">
- @import "../../../dojo/resources/dojo.css";
- @import "../../../dijit/tests/css/dijitTests.css";
-</style>
-<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-<!--
-The next line should include Microsoft's Silverligth.js, if you plan to use the silverlight backend
-<script type="text/javascript" src="Silverlight.js"></script>
--->
-<script type="text/javascript" src="../../../dojo/dojo.js" djConfig="isDebug: true"></script>
-<script type="text/javascript" src="../_base.js"></script>
-<script type="text/javascript" src="../shape.js"></script>
-<script type="text/javascript" src="../path.js"></script>
-<script type="text/javascript" src="../arc.js"></script>
-<!--<script type="text/javascript" src="../vml.js"></script>-->
-<!--<script type="text/javascript" src="../svg.js"></script>-->
-<!--<script type="text/javascript" src="../canvas.js"></script>-->
-<!--<script type="text/javascript" src="../silverlight.js"></script>-->
-<script type="text/javascript">
-dojo.require("dojox.gfx");
-
-makeShapes = function(){
- var surface = dojox.gfx.createSurface("test", 500, 300);
- var g = surface.createGroup();
-
- // create a reference ellipse
- var rx = 200;
- var ry = 100;
- var startAngle = -30;
- var arcAngle = -90;
- var axisAngle = -30;
- var e = g.createEllipse({rx: rx, ry: ry}).setStroke({});
-
- // calculate a bezier
- var alpha = dojox.gfx.matrix._degToRad(arcAngle) / 2; // half of our angle
- var cosa = Math.cos(alpha);
- var sina = Math.sin(alpha);
- // start point
- var p1 = {x: cosa, y: sina};
- // 1st control point
- var p2 = {x: cosa + (4 / 3) * (1 - cosa), y: sina - (4 / 3) * cosa * (1 - cosa) / sina};
- // 2nd control point (symmetric to the 1st one)
- var p3 = {x: p2.x, y: -p2.y};
- // end point (symmetric to the start point)
- var p4 = {x: p1.x, y: -p1.y};
-
- // rotate and scale poins as appropriate
- var s = dojox.gfx.matrix.normalize([dojox.gfx.matrix.scale(e.shape.rx, e.shape.ry), dojox.gfx.matrix.rotateg(startAngle + arcAngle / 2)]);
- p1 = dojox.gfx.matrix.multiplyPoint(s, p1);
- p2 = dojox.gfx.matrix.multiplyPoint(s, p2);
- p3 = dojox.gfx.matrix.multiplyPoint(s, p3);
- p4 = dojox.gfx.matrix.multiplyPoint(s, p4);
- // draw control trapezoid
- var t = g.createPath().setStroke({color: "blue"});
- t.moveTo(p1.x, p1.y);
- t.lineTo(p2.x, p2.y);
- t.lineTo(p3.x, p3.y);
- t.lineTo(p4.x, p4.y);
- t.lineTo(p1.x, p1.y);
- t.moveTo((p1.x + p4.x) / 2, (p1.y + p4.y) / 2);
- t.lineTo((p2.x + p3.x) / 2, (p2.y + p3.y) / 2);
- t.moveTo((p1.x + p2.x) / 2, (p1.y + p2.y) / 2);
- t.lineTo((p3.x + p4.x) / 2, (p3.y + p4.y) / 2);
- // draw a bezier
- var b = g.createPath().setStroke({color: "red"});
- b.moveTo(p1.x, p1.y);
- b.curveTo(p2.x, p2.y, p3.x, p3.y, p4.x, p4.y);
- // move everything in a middle
- g.setTransform([dojox.gfx.matrix.translate(250, 150), dojox.gfx.matrix.rotateg(axisAngle)]);
-};
-
-dojo.addOnLoad(makeShapes);
-
-</script>
-</head>
-<body>
-<h1>Approximation of an arc with bezier</h1>
-<!--<p><button onclick="makeShapes();">Make</button></p>-->
-<div id="test" style="width: 500px; height: 300px;"></div>
-<p>That's all Folks!</p>
-</body>
-</html>
projects / eow / blobdiff