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common: fix a precision issue in appendArc api

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For angles close to multiples of pi/2, precision
based on FLT_EPSILON was insufficient. It either
led to the creation of an additional cubic segment
filled with erroneous values or NaNs, or it resulted
in the drawing of an angle for a sweep close to 0.
This commit is contained in:
Mira Grudzinska 2024-05-06 22:43:18 +02:00 • committed by Hermet Park
parent 6503fcc8a8
commit d27a9782d4
1 changed files with 4 additions and 2 deletions
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6
src/renderer/tvgShape.cpp
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@ -145,13 +145,15 @@ Result Shape::appendArc(float cx, float cy, float radius, float startAngle, floa
//just circle
if (sweep >= 360.0f || sweep <= -360.0f) return appendCircle(cx, cy, radius, radius);
const float arcPrecision = 1e-5f;
startAngle = mathDeg2Rad(startAngle);
sweep = mathDeg2Rad(sweep);
auto nCurves = ceil(fabsf(sweep / MATH_PI2));
auto nCurves = static_cast<int>(fabsf(sweep / MATH_PI2));
if (fabsf(sweep / MATH_PI2) - nCurves > arcPrecision) ++nCurves;
auto sweepSign = (sweep < 0 ? -1 : 1);
auto fract = fmodf(sweep, MATH_PI2);
fract = (mathZero(fract)) ? MATH_PI2 * sweepSign : fract;
fract = (fabsf(fract) < arcPrecision) ? MATH_PI2 * sweepSign : fract;
//Start from here
Point start = {radius * cosf(startAngle), radius * sinf(startAngle)};