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ImDrawList: clarified that PathArcTo()/PathArcToFast() cannot take radius < 0.0f. (#3491) + changed poor-man ceiling in _CalcCircleAutoSegmentCount() to use 0.999999f to reduce gaps

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Previously it sorts of accidentally worked but would lead to counter-clockwise paths which and have an effect on anti-aliasing.
This commit is contained in:
ocornut 2021-03-11 10:29:13 +01:00
parent a3ebd160cb
commit 8ed34af6f8
3 changed files with 7 additions and 3 deletions
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2
docs/CHANGELOG.txt
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@ -42,6 +42,8 @@ Breaking Changes:
bool closed = false ----> use ImDrawFlags_None, or 0
bool closed = true ----> use ImDrawFlags_Closed
Difference may not be noticeable for most but zealous type-checking tools may report a need to change.
- ImDrawList: clarified that PathArcTo()/PathArcToFast() won't render with radius < 0.0f. Previously it sorts
of accidentally worked but would lead to counter-clockwise paths which and have an effect on anti-aliasing.
- Style: renamed rarely used style.CircleSegmentMaxError (old default = 1.60f)
to style.CircleTessellationMaxError (new default = 0.30f) as its meaning changed. (#3808) [@thedmd]
- Win32+MinGW: Re-enabled IME functions by default even under MinGW. In July 2016, issue #738 had me incorrectly

1
imgui.cpp
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@ -376,6 +376,7 @@ CODE
When you are not sure about a old symbol or function name, try using the Search/Find function of your IDE to look for comments or references in all imgui files.
You can read releases logs https://github.com/ocornut/imgui/releases for more details.
- 2021/03/11 (1.82) - clarified that ImDrawList::PathArcTo(), ImDrawList::PathArcToFast() won't render with radius < 0.0f. Previously it sorts of accidentally worked but would generally lead to counter-clockwise paths and have an effect on anti-aliasing.
- 2021/03/10 (1.82) - upgraded ImDrawList::AddPolyline() and PathStroke() "bool closed" parameter to "ImDrawFlags flags". The matching ImDrawFlags_Closed value is guaranteed to always stay == 1 in the future.
- 2021/02/22 (1.82) - win32+mingw: Re-enabled IME functions by default even under MinGW. In July 2016, issue #738 had me incorrectly disable those default functions for MinGW. MinGW users should: either link with -limm32, either set their imconfig file with '#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS'.
- 2021/02/17 (1.82) - renamed rarely used style.CircleSegmentMaxError (old default = 1.60f) to style.CircleTessellationMaxError (new default = 0.30f) as the meaning of the value changed.

7
imgui_draw.cpp
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@ -545,7 +545,7 @@ void ImDrawList::_OnChangedVtxOffset()
int ImDrawList::_CalcCircleAutoSegmentCount(float radius) const
{
// Automatic segment count
const int radius_idx = (int)(radius + 0.999f); // ceil to never reduce accuracy
const int radius_idx = (int)(radius + 0.999999f); // ceil to never reduce accuracy
if (radius_idx < IM_ARRAYSIZE(_Data->CircleSegmentCounts))
return _Data->CircleSegmentCounts[radius_idx]; // Use cached value
else
@ -1026,9 +1026,10 @@ void ImDrawList::AddConvexPolyFilled(const ImVec2* points, const int points_coun
}
}
// 0: East, 3: South, 6: West, 9: North, 12: East
void ImDrawList::PathArcToFast(const ImVec2& center, float radius, int a_min_of_12, int a_max_of_12)
{
if (radius == 0.0f)
if (radius <= 0.0f)
{
_Path.push_back(center);
return;
@ -1052,7 +1053,7 @@ void ImDrawList::PathArcToFast(const ImVec2& center, float radius, int a_min_of_
void ImDrawList::PathArcTo(const ImVec2& center, float radius, float a_min, float a_max, int num_segments)
{
if (radius == 0.0f)
if (radius <= 0.0f)
{
_Path.push_back(center);
return;