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AddCircle, AddCircleFilled: Add auto-calculation of circle segment counts

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This commit is contained in:
Ben Carter
2019-12-09 15:57:24 +09:00
committed by omar
parent 2eda3585e7
commit 051ce0765e
5 changed files with 62 additions and 8 deletions
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41
imgui_draw.cpp
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@ -348,6 +348,8 @@ ImDrawListSharedData::ImDrawListSharedData()
Font = NULL;
FontSize = 0.0f;
CurveTessellationTol = 0.0f;
CircleSegmentMaxError = 0.0f;
CircleSegmentCountsMaxCircleSegmentError = -FLT_MIN; // Impossible value to force recalculation
ClipRectFullscreen = ImVec4(-8192.0f, -8192.0f, +8192.0f, +8192.0f);
InitialFlags = ImDrawListFlags_None;
@ -1083,11 +1085,34 @@ void ImDrawList::AddTriangleFilled(const ImVec2& p1, const ImVec2& p2, const ImV
PathFillConvex(col);
}
void ImDrawListSharedData::RecalculateCircleSegmentCounts()
{
for (int i = 0; i < NumCircleSegmentCounts; i++)
{
const float radius = i + 1.0f;
CircleSegmentCounts[i] = ImClamp((int)((IM_PI * 2.0f) / ImAcos((radius - CircleSegmentMaxError) / radius)), 3, 10000);
}
CircleSegmentCountsMaxCircleSegmentError = CircleSegmentMaxError;
}
void ImDrawList::AddCircle(const ImVec2& center, float radius, ImU32 col, int num_segments, float thickness)
{
if ((col & IM_COL32_A_MASK) == 0 || num_segments <= 2)
if ((col & IM_COL32_A_MASK) == 0 || (radius <= 0.0f))
return;
// Calculate number of segments if required
if (num_segments <= 0)
{
int radius_int = (int)radius;
if (radius_int <= ImDrawListSharedData::NumCircleSegmentCounts)
num_segments = _Data->CircleSegmentCounts[radius_int - 1]; // Use cached value
else
num_segments = ImClamp((int)((IM_PI * 2.0f) / ImAcos((radius - _Data->CircleSegmentMaxError) / radius)), 3, 10000);
}
else
num_segments = ImClamp(num_segments, 3, 10000); // Clamp to avoid drawing insanely tessellated shapes
// Because we are filling a closed shape we remove 1 from the count of segments/points
const float a_max = (IM_PI * 2.0f) * ((float)num_segments - 1.0f) / (float)num_segments;
PathArcTo(center, radius - 0.5f, 0.0f, a_max, num_segments - 1);
@ -1096,9 +1121,21 @@ void ImDrawList::AddCircle(const ImVec2& center, float radius, ImU32 col, int nu
void ImDrawList::AddCircleFilled(const ImVec2& center, float radius, ImU32 col, int num_segments)
{
if ((col & IM_COL32_A_MASK) == 0 || num_segments <= 2)
if ((col & IM_COL32_A_MASK) == 0 || (radius <= 0.0f))
return;
// Calculate number of segments if required
if (num_segments <= 0)
{
int radius_int = (int)radius;
if (radius_int <= ImDrawListSharedData::NumCircleSegmentCounts)
num_segments = _Data->CircleSegmentCounts[radius_int - 1]; // Use cached value
else
num_segments = ImClamp((int)((IM_PI * 2.0f) / ImAcos((radius - _Data->CircleSegmentMaxError) / radius)), 3, 10000);
}
else
num_segments = ImClamp(num_segments, 3, 10000); // Clamp to avoid drawing insanely tessellated shapes
// Because we are filling a closed shape we remove 1 from the count of segments/points
const float a_max = (IM_PI * 2.0f) * ((float)num_segments - 1.0f) / (float)num_segments;
PathArcTo(center, radius, 0.0f, a_max, num_segments - 1);