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[apps/shared] Add margin to avoid visible approximation errors

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Hugo Saint-Vignes
2020-12-21 16:01:00 +01:00
committed by EmilieNumworks
parent 60f875220e
commit 1939293cd2
1 changed files with 8 additions and 3 deletions
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11
apps/shared/curve_view.cpp
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@@ -713,6 +713,10 @@ void CurveView::drawPolarCurve(KDContext * ctx, KDRect rect, float tStart, float
tMax = t1;
}
// Add a thousandth of π as a margin to avoid visible approximation errors.
tMax += piInAngleUnit / 1000.0f;
tMin -= piInAngleUnit / 1000.0f;
/* To optimize cache hits, the area actually drawn will be extended to nearest
* cached θ. tStep being a multiple of cache steps (see
* ComputeNonCartesianSteps), we extend segments on both ends to the closest
@@ -725,10 +729,11 @@ void CurveView::drawPolarCurve(KDContext * ctx, KDRect rect, float tStart, float
* |-------|-------|-------|-------|-------|-------|-------|--
* tMax-tMin=3 : |---***-|---***-|---***-|---***-|---***-|---***-|---***-|--
* A - tStep=3 : |---***-|---***-|---***-|---***-|---***-|---***-|---***-|--
* |---^^^-|--^^^^^|^^^^^^^|---^^^-|--^^^^^|^^^^^^^|---^^^-|--
* |___^^^_|__ | ^^^^^^|___ _|__^^^^^|^ |___^^^_|__
* | | ^^^^^|^ | ^^^ | | ^^^^^^| |
*
* B - tStep=6 : |---***-|---***-|---***-|---***-|---***-|---***-|---***-|--
* |---^^^^|^^ | ^^^^^^| ^|^^^^^^^|^^^^ | ^^^^|^^
* |___^^^^|^^ | ^^^^^^| ^|^^^^^^^|^^^^ | ^^^^|^^
* | | ^^^^^|^ |^^^^^^ | ^^|^^^^^^^|^^^ |
* In situation A, Step are small enough, not all segments must be drawn.
* In situation B, The entire range should be drawn, and two extended segments
@@ -764,7 +769,7 @@ void CurveView::drawPolarCurve(KDContext * ctx, KDRect rect, float tStart, float
int j = std::ceil((tE - tStart) / tStep);
tCache2 = std::min(tStart + tStep * j, tEnd);
assert(tCache1 < tCache2);
assert(tCache1 <= tCache2);
drawCurve(ctx, rect, tCache1, tCache2, tStep, xyFloatEvaluation, model, context, drawStraightLinesEarly, color, thick, colorUnderCurve, colorLowerBound, colorUpperBound, xyDoubleEvaluation);
}
thetaOffset += piInAngleUnit;