Created
October 17, 2012 18:38
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drawCircle
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function drawCircle( graphics:Graphics, x:Number, y:Number, radius:Number ):void | |
{ | |
var k:Number = 4 / 3 * ( Math.SQRT2 - 1 ); | |
var a:Number, b:Number, c:Number, d:Number, e:Number; | |
var ax:Number, bx:Number, cx:Number, dx:Number, ex:Number; | |
var ay:Number, by:Number, cy:Number, dy:Number, ey:Number; | |
e = radius; | |
d = k * radius; | |
c = 0; | |
b = -d; | |
a = -e; | |
ax = a + x; | |
bx = b + x; | |
cx = c + x; | |
dx = d + x; | |
ex = e + x; | |
ay = a + y; | |
by = b + y; | |
cy = c + y; | |
dy = d + y; | |
ey = e + y; | |
graphics.moveTo( cx, ay ); | |
graphics.cubicCurveTo( dx, ay, ex, by, ex, cy ); | |
graphics.cubicCurveTo( ex, dy, dx, ey, cx, ey ); | |
graphics.cubicCurveTo( bx, ey, ax, dy, ax, cy ); | |
graphics.cubicCurveTo( ax, by, bx, ay, cx, ay ); | |
/* | |
//ccw in flash screen coordinate | |
graphics.cubicCurveTo( bx, ay, ax, by, ax, cy ); | |
graphics.cubicCurveTo( ax, dy, bx, ey, cx, ey ); | |
graphics.cubicCurveTo( dx, ey, ex, dy, ex, cy ); | |
graphics.cubicCurveTo( ex, by, dx, ay, cx, ay ); | |
*/ | |
} |
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function drawCircleUsingQuadraticBezier( graphics:Graphics, x:Number, y:Number, radius:Number ):void | |
{ | |
var pi:Number = Math.PI; | |
var a:Number, b:Number, c:Number, d:Number, e:Number, f:Number, g:Number; | |
var ax:Number, bx:Number, cx:Number, dx:Number, ex:Number, fx:Number, gx:Number; | |
var ay:Number, by:Number, cy:Number, dy:Number, ey:Number, fy:Number, gy:Number; | |
g = radius; | |
f = Math.sin( pi / 4 ) * radius; | |
e = Math.tan( pi / 8 ) * radius; | |
d = 0; | |
c = -e; | |
b = -f; | |
a = -g; | |
ax = a + x; | |
bx = b + x; | |
cx = c + x; | |
dx = d + x; | |
ex = e + x; | |
fx = f + x; | |
gx = g + x; | |
ay = a + y; | |
by = b + y; | |
cy = c + y; | |
dy = d + y; | |
ey = e + y; | |
fy = f + y; | |
gy = g + y; | |
graphics.moveTo( dx, ay ); | |
graphics.curveTo( ex, ay, fx, by ); | |
graphics.curveTo( gx, cy, gx, dy ); | |
graphics.curveTo( gx, ey, fx, fy ); | |
graphics.curveTo( ex, gy, dx, gy ); | |
graphics.curveTo( cx, gy, bx, fy ); | |
graphics.curveTo( ax, ey, ax, dy ); | |
graphics.curveTo( ax, cy, bx, by ); | |
graphics.curveTo( cx, ay, dx, ay ); | |
} |
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