Arc shape

Dr. Michael Paus mp at
Wed May 2 09:17:19 PDT 2012

But if z would come out of the screen and x is to the right, then y 
would be going up according to the right hand rule.

Am 02.05.2012 18:06, schrieb Jeff Martin:
> I think rotation is following the right hand coordinate system (or right hand thumb rule) with positive z coming out of the screen.
> The StartAngle also seems to be working correctly according to a sanity test I just did. The start angle defines where the angle starts so it doesn't effect (and shouldn't be subtracted from) the arc length.
> jeff
> On May 2, 2012, at 7:26 AM, goddard at wrote:
>> Hi,
>> I've got this constructor for an arc:
>> Arc a = new Arc(100f, 100f, 50f, 50f, 0f, 120f); //cX, cY, rX, rY, angle,
>> length
>> That produces the visual output you can see in the attached screenshot.
>> My questions are:
>> - if the 0 degree starts at X axis, then why?
>> - if an arc is extended counter-clockwise, then why?
>> Does it ignore the startAngle completely?
>> Arc a2 = new Arc(200f, 100f, 50f, 50f, 120f, 240f); //produces an arc of length 240, instead of 120?
>> There're other things/properties that are designed to use the clockwise system
>> (top, right, bottom, left) in JavaFX, therefore this makes a programmer to
>> "switch" between these two concepts, in addition to all the other things one
>> must remember.
>> I think we had similar discussion during JavaFX 1.2 or 1.3 development...
>> Regards, Jiri

Dr. Michael Paus, Chairman of the Java User Group Stuttgart e.V. (JUGS).
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