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common: Changing the circle/ellipse starting point

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According to the SVG standard, drawing a circle/ellipse
should start at the '3 o'clock' position and proceed
in a clock-wise direction. Until now, this point was
set at '12 o'clock'.
The differences in the outcome were visible for dashed
strokes.

issue: https://github.com/thorvg/thorvg/issues/1686
This commit is contained in:
Mira Grudzinska 2024-02-19 02:20:31 +01:00 • committed by Hermet Park
parent 8b2ddf7377
commit 6ec88ed486
1 changed files with 2 additions and 2 deletions
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4
src/renderer/tvgShape.cpp
View file

@ -130,11 +130,11 @@ Result Shape::appendCircle(float cx, float cy, float rx, float ry) noexcept
auto ryKappa = ry * PATH_KAPPA;
pImpl->grow(6, 13);
pImpl->moveTo(cx, cy - ry);
pImpl->cubicTo(cx + rxKappa, cy - ry, cx + rx, cy - ryKappa, cx + rx, cy);
pImpl->moveTo(cx + rx, cy);
pImpl->cubicTo(cx + rx, cy + ryKappa, cx + rxKappa, cy + ry, cx, cy + ry);
pImpl->cubicTo(cx - rxKappa, cy + ry, cx - rx, cy + ryKappa, cx - rx, cy);
pImpl->cubicTo(cx - rx, cy - ryKappa, cx - rxKappa, cy - ry, cx, cy - ry);
pImpl->cubicTo(cx + rxKappa, cy - ry, cx + rx, cy - ryKappa, cx + rx, cy);
pImpl->close();
return Result::Success;