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added elliptical arc #697

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53970fc
added elliptical arc
Nov 25, 2015
47b0428
More for elliptical arcs: code cleanup, added test case, added demo f…
Dec 12, 2017
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Binary file modified docs/EaselJS_docs-0.8.1.zip
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99 changes: 99 additions & 0 deletions ellipticalArcDemo.htm
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<script src="EaselJS/build/output/easeljs-0.8.1.min.js"></script>
<script>

function radFromDeg(degree)
{
return degree * Math.PI / 180;
}

function testEllipticalArcs() {

let testAngles = [
[ [10, 50], [15, 105], [30, 250], [45, 300], [50, 20] ],
[ [100, 170], [110, 220], [99, 299], [120, 15], [150, 120] ],
[ [200, 260], [210, 295], [230, 10], [220, 100], [260, 190] ],
[ [275, 350], [280, 15], [300, 100], [330, 200], [310, 290] ],
[ [10, 370], [15, 390], [0, 330], [-1, 50], [80, -290] ] ]; // last three are degenerated cases


let closures = [ null, 'radii', 'chord' ];
let directions = [ true, false ];

let rx = 50;
let ry = 30;
let pad = 15;
var x = pad + rx;
var y = pad + ry;

var stage = new createjs.Stage("demoCanvas");

for (closure of closures)
{
for (direction of directions)
{
for (row of testAngles)
{
for (pair of row)
{
var b = new createjs.Shape();

var elps = b.graphics;
elps.beginFill("#C0C0C0");

var s = new createjs.Shape();

var arc = s.graphics;
arc.setStrokeStyle(3);
arc.beginStroke("#000000");

// First check for 3 special case
if (pair[0] == 0) // circular arc
{
arc.ellipticalArc(x, y, ry, ry, radFromDeg(pair[0]), radFromDeg(pair[1]), direction, closure);
elps.drawEllipse(x - ry, y - ry, 2 * ry, 2 * ry);
}
else if (pair[0] < 0) // degenerate into horizontal line
{
arc.ellipticalArc(x, y, rx, 0.000, radFromDeg(-pair[0]), radFromDeg(pair[1]), direction, closure);
elps.drawEllipse(x - rx, y - ry, 2 * rx, 0);
}
else if (pair[1] < 0) // degenerate into vertical line
{
arc.ellipticalArc(x, y, 0, ry, radFromDeg(pair[0]), radFromDeg(-pair[1]), direction, closure);
elps.drawEllipse(x - rx, y - ry, 0, 2 * ry);
}
else // regular elliptical arc
{
arc.ellipticalArc(x, y, rx, ry, radFromDeg(pair[0]), radFromDeg(pair[1]), direction, closure);
elps.drawEllipse(x - rx, y - ry, 2 * rx, 2 * ry);
}

x += 2 * rx + pad;

stage.addChild(b);
stage.addChild(s);
}

stage.update();

x = pad + rx; // CR
y += 2 * ry + pad; // LF
}

x = pad + rx; // CR
y += pad; // LF
}

x = pad + rx; // CR
y += pad; // LF
}

stage.update();

}

</script>

<body onload="testEllipticalArcs();">
<canvas id="demoCanvas" width="600" height="2370" style="border:1px solid #000000;background-color: #00C0C0 "></canvas>
</body>
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