Arc shape

[Jeff Martin]

Good point. :-). I'm not even sure which way the z-axis goes. Is there a document on the JavaFX coordinate system?

jeff


On May 2, 2012, at 11:17 AM, Dr. Michael Paus wrote:

> 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 seznam.cz 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).
> For more information visit www.jugs.de.
>