Hi Peter,
the RTBezierLine has been fixed ! Load the last Roassal (with Trachel) and try again your code.
(ps: There is also the RTSVGPathBezierLine that works the same but use a generated SVG string to create the path.)
This post raised an interesting problem: the RTBezierLine is actually creating a serie of quadratic bezier lines. If you have 2 points of control between two points you will have two quadratic bezier lines instead of a real cubic bezier line. If someone is interested in this I think it could be possible with some work to add this option.
thanks,
Pierre
2015-04-28 12:32 GMT-03:00 Alexandre Bergel alexandre.bergel@me.com:
Hi Peter!
This is a problem we have had for a while. I did not think about comparing it with the path. We will rewrite RTBezierLine to use TRSVGPath
We will let you know
Cheers, Alexandre
-- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
On Apr 27, 2015, at 6:34 PM, Peter Uhnák i.uhnak@gmail.com wrote:
Hi,
it seems that last control point of a bezier line is off. Here is a comparative view of RTBezierLine (black line) and bezier line done with SVG (red line). Notice how the bottom half is flatlined and doesn't match up.
<2015-04-28_00:29:16.png> And the code (based on RTRoassalExample>>exampleBezierCurve):
| v e1 e2 l s p1 p2 path svg| v := RTView new. e1 := (RTEllipse new size: 15; color: (Color blue alpha: 0.4)) element. e2 := (RTEllipse new size: 15; color: (Color blue alpha: 0.4)) element. e2 translateBy: -150 @ 150. p1 := RTBox element. p2 := RTBox element. p1 translateTo: (e2 position x + e1 position x / 2) @ e1 position y. p2 translateTo: (e2 position x + e1 position x / 2) @ e2 position y. v add: p1. v add: p2. s := RTBezierLine new. s color: Color black. s controllingElements: (Array with: p1 with: p2). l := s edgeFrom: e1 to: e2. v add: e1. v add: e2. v add: l. path := 'M -150 150 Q -75 150 -75 75 Q -75 0 0 0'. svg := RTSVGPath new borderColor: Color red; path: path; element. v add: svg. ^ vPeter
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