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Fixed angles in ImDrawList::PathArcTo(), PathArcToFast() being off by an extra PI for no reason

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This commit is contained in:
ocornut 2015-07-18 18:45:37 -06:00
parent 479211808f
commit 74908a9513
2 changed files with 12 additions and 11 deletions
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19
imgui.cpp
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@ -136,8 +136,9 @@
Occasionally introducing changes that are breaking the API. The breakage are generally minor and easy to fix.
Here is a change-log of API breaking changes, if you are using one of the functions listed, expect to have to fix some code.
- 2015/07/18 (1.44) - fixed angles in ImDrawList::PathArcTo(), PathArcToFast() (introduced in 1.43) being off by an extra PI for no justifiable reason
- 2015/07/14 (1.43) - add new ImFontAtlas::AddFont() API. For the old AddFont***, moved the 'font_no' parameter of ImFontAtlas::AddFont** functions to the ImFontConfig structure.
you need to render your textured triangles with bilinear filtering to benefit from subpixel positioning of text.
you need to render your textured triangles with bilinear filtering to benefit from sub-pixel positioning of text.
- 2015/07/08 (1.43) - switched rendering data to use indexed rendering. this is saving a fair amount of CPU/GPU and enables us to get anti-aliasing for a marginal cost.
this necessary change will break your rendering function! the fix should be very easy. sorry for that :(
- if you are using a vanilla copy of one of the imgui_impl_XXXX.cpp provided in the example, you just need to update your copy and you can ignore the rest.
@ -4050,7 +4051,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
const ImVec2 br = window->Rect().GetBR();
window->DrawList->PathLineTo(br + ImVec2(-corner_size, 0.0f));
window->DrawList->PathLineTo(br + ImVec2(0.0f, -corner_size));
window->DrawList->PathArcToFast(ImVec2(br.x - window_rounding, br.y - window_rounding), window_rounding, 6, 9);
window->DrawList->PathArcToFast(ImVec2(br.x - window_rounding, br.y - window_rounding), window_rounding, 0, 3);
window->DrawList->PathFill(resize_col);
}
}
@ -9451,8 +9452,8 @@ void ImDrawList::PathArcToFast(const ImVec2& centre, float radius, int amin, int
for (int i = 0; i < circle_vtx_count; i++)
{
const float a = ((float)i / (float)circle_vtx_count) * 2*IM_PI;
circle_vtx[i].x = cosf(a + IM_PI);
circle_vtx[i].y = sinf(a + IM_PI);
circle_vtx[i].x = cosf(a);
circle_vtx[i].y = sinf(a);
}
circle_vtx_builds = true;
}
@ -9481,7 +9482,7 @@ void ImDrawList::PathArcTo(const ImVec2& centre, float radius, float amin, float
for (int i = 0; i <= num_segments; i++)
{
const float a = amin + ((float)i / (float)num_segments) * (amax - amin);
_Path.push_back(ImVec2(centre.x + cosf(a + IM_PI) * radius, centre.y + sinf(a + IM_PI) * radius));
_Path.push_back(ImVec2(centre.x + cosf(a) * radius, centre.y + sinf(a) * radius));
}
}
@ -9504,10 +9505,10 @@ void ImDrawList::PathRect(const ImVec2& a, const ImVec2& b, float rounding, int
const float r1 = (rounding_corners & 2) ? r : 0.0f;
const float r2 = (rounding_corners & 4) ? r : 0.0f;
const float r3 = (rounding_corners & 8) ? r : 0.0f;
PathArcToFast(ImVec2(a.x+r0,a.y+r0), r0, 0, 3);
PathArcToFast(ImVec2(b.x-r1,a.y+r1), r1, 3, 6);
PathArcToFast(ImVec2(b.x-r2,b.y-r2), r2, 6, 9);
PathArcToFast(ImVec2(a.x+r3,b.y-r3), r3, 9, 12);
PathArcToFast(ImVec2(a.x+r0,a.y+r0), r0, 6, 9);
PathArcToFast(ImVec2(b.x-r1,a.y+r1), r1, 9, 12);
PathArcToFast(ImVec2(b.x-r2,b.y-r2), r2, 0, 3);
PathArcToFast(ImVec2(a.x+r3,b.y-r3), r3, 3, 6);
}
}

4
imgui.h
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@ -1080,8 +1080,8 @@ struct ImDrawList
// Stateful path API, add points then finish with PathFill() or PathStroke()
inline void PathClear() { _Path.resize(0); }
inline void PathLineTo(const ImVec2& p) { _Path.push_back(p); }
IMGUI_API void PathArcToFast(const ImVec2& centre, float radius, int a_min, int a_max);
IMGUI_API void PathArcTo(const ImVec2& centre, float radius, float a_min, float a_max, int num_segments = 12);
IMGUI_API void PathArcTo(const ImVec2& centre, float radius, float a_min, float a_max, int num_segments = 10);
IMGUI_API void PathArcToFast(const ImVec2& centre, float radius, int a_min_of_12, int a_max_of_12);
IMGUI_API void PathRect(const ImVec2& a, const ImVec2& b, float rounding = 0.0f, int rounding_corners = 0x0F);
inline void PathFill(ImU32 col) { AddConvexPolyFilled(_Path.Data, _Path.Size, col, true); PathClear(); }
inline void PathStroke(ImU32 col, bool closed, float thickness = 1.0f) { AddPolyline(_Path.Data, _Path.Size, col, closed, thickness, true); PathClear(); }