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Fix the ellipse method

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Devon Govett 2014-02-24 23:25:41 -08:00
parent c1319acff8
commit 350863bfda
1 changed files with 16 additions and 9 deletions
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25
lib/mixins/vector.coffee
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@ -82,15 +82,22 @@ module.exports =
@quadraticCurveTo x, y, x + r, y
ellipse: (x, y, r1, r2 = r1) ->
l1 = r1 * KAPPA
l2 = r2 * KAPPA
@moveTo x + r1, y
@bezierCurveTo x + r1, y + l1, x + l2, y + r2, x, y + r2
@bezierCurveTo x - l2, y + r2, x - r1, y + l1, x - r1, y
@bezierCurveTo x - r1, y - l1, x - l2, y - r2, x, y - r2
@bezierCurveTo x + l2, y - r2, x + r1, y - l1, x + r1, y
@moveTo x, y
# based on http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas/2173084#2173084
x -= r1
y -= r2
ox = r1 * KAPPA
oy = r2 * KAPPA
xe = x + r1 * 2
ye = y + r2 * 2
xm = x + r1
ym = y + r2
@moveTo(x, ym)
@bezierCurveTo(x, ym - oy, xm - ox, y, xm, y)
@bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym)
@bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye)
@bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym)
@closePath()
circle: (x, y, radius) ->
@ellipse x, y, radius