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Demo: Custom Rendering: better demonstrate PathArcTo(), PathBezierQuadraticCurveTo(), PathBezierCubicCurveTo(), PathStroke(), PathFillConvex() functions.

This commit is contained in:
ocornut 2024-02-20 16:33:54 +01:00
parent 3b6d924acd
commit 198c38f0b1
3 changed files with 36 additions and 6 deletions
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2
docs/CHANGELOG.txt
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@ -55,6 +55,8 @@ Other changes:
drawn too low, particularly visible with tables that have no scrolling. (#6917)
- ProgressBar: Fixed a minor tesselation issue when rendering rounded progress bars,
where in some situations the rounded section wouldn't follow regular tesselation rules.
- Demo: Custom Rendering: better demonstrate PathArcTo(), PathBezierQuadraticCurveTo(),
PathBezierCubicCurveTo(), PathStroke(), PathFillConvex() functions.
-----------------------------------------------------------------------

3
imgui.h
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@ -2765,7 +2765,8 @@ struct ImDrawList
IMGUI_API void AddImageRounded(ImTextureID user_texture_id, const ImVec2& p_min, const ImVec2& p_max, const ImVec2& uv_min, const ImVec2& uv_max, ImU32 col, float rounding, ImDrawFlags flags = 0);
// Stateful path API, add points then finish with PathFillConvex() or PathStroke()
// - Filled shapes must always use clockwise winding order. The anti-aliasing fringe depends on it. Counter-clockwise shapes will have "inward" anti-aliasing.
// - Important: filled shapes must always use clockwise winding order! The anti-aliasing fringe depends on it. Counter-clockwise shapes will have "inward" anti-aliasing.
// so e.g. 'PathArcTo(center, radius, PI * -0.5f, PI)' is ok, whereas 'PathArcTo(center, radius, PI, PI * -0.5f)' won't have correct anti-aliasing when followed by PathFillConvex().
inline void PathClear() { _Path.Size = 0; }
inline void PathLineTo(const ImVec2& pos) { _Path.push_back(pos); }
inline void PathLineToMergeDuplicate(const ImVec2& pos) { if (_Path.Size == 0 || memcmp(&_Path.Data[_Path.Size - 1], &pos, 8) != 0) _Path.push_back(pos); }

37
imgui_demo.cpp
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@ -8030,6 +8030,9 @@ static void ShowExampleAppCustomRendering(bool* p_open)
const float rounding = sz / 5.0f;
const int circle_segments = circle_segments_override ? circle_segments_override_v : 0;
const int curve_segments = curve_segments_override ? curve_segments_override_v : 0;
const ImVec2 cp3[3] = { ImVec2(0.0f, sz * 0.6f), ImVec2(sz * 0.5f, -sz * 0.4f), ImVec2(sz, sz) }; // Control points for curves
const ImVec2 cp4[4] = { ImVec2(0.0f, 0.0f), ImVec2(sz * 1.3f, sz * 0.3f), ImVec2(sz - sz * 1.3f, sz - sz * 0.3f), ImVec2(sz, sz) };
float x = p.x + 4.0f;
float y = p.y + 4.0f;
for (int n = 0; n < 2; n++)
@ -8048,17 +8051,23 @@ static void ShowExampleAppCustomRendering(bool* p_open)
draw_list->AddLine(ImVec2(x, y), ImVec2(x, y + sz), col, th); x += spacing; // Vertical line (note: drawing a filled rectangle will be faster!)
draw_list->AddLine(ImVec2(x, y), ImVec2(x + sz, y + sz), col, th); x += sz + spacing; // Diagonal line
// Path
draw_list->PathArcTo(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, 3.141592f, 3.141592f * -0.5f);
draw_list->PathStroke(col, ImDrawFlags_None, th);
x += sz + spacing;
// Quadratic Bezier Curve (3 control points)
ImVec2 cp3[3] = { ImVec2(x, y + sz * 0.6f), ImVec2(x + sz * 0.5f, y - sz * 0.4f), ImVec2(x + sz, y + sz) };
draw_list->AddBezierQuadratic(cp3[0], cp3[1], cp3[2], col, th, curve_segments); x += sz + spacing;
draw_list->AddBezierQuadratic(ImVec2(x + cp3[0].x, y + cp3[0].y), ImVec2(x + cp3[1].x, y + cp3[1].y), ImVec2(x + cp3[2].x, y + cp3[2].y), col, th, curve_segments);
x += sz + spacing;
// Cubic Bezier Curve (4 control points)
ImVec2 cp4[4] = { ImVec2(x, y), ImVec2(x + sz * 1.3f, y + sz * 0.3f), ImVec2(x + sz - sz * 1.3f, y + sz - sz * 0.3f), ImVec2(x + sz, y + sz) };
draw_list->AddBezierCubic(cp4[0], cp4[1], cp4[2], cp4[3], col, th, curve_segments);
draw_list->AddBezierCubic(ImVec2(x + cp4[0].x, y + cp4[0].y), ImVec2(x + cp4[1].x, y + cp4[1].y), ImVec2(x + cp4[2].x, y + cp4[2].y), ImVec2(x + cp4[3].x, y + cp4[3].y), col, th, curve_segments);
x = p.x + 4;
y += sz + spacing;
}
// Filled shapes
draw_list->AddNgonFilled(ImVec2(x + sz * 0.5f, y + sz * 0.5f), sz * 0.5f, col, ngon_sides); x += sz + spacing; // N-gon
draw_list->AddCircleFilled(ImVec2(x + sz * 0.5f, y + sz * 0.5f), sz * 0.5f, col, circle_segments); x += sz + spacing; // Circle
draw_list->AddEllipseFilled(ImVec2(x + sz * 0.5f, y + sz * 0.5f), sz * 0.5f, sz * 0.3f, col, -0.3f, circle_segments); x += sz + spacing;// Ellipse
@ -8070,9 +8079,27 @@ static void ShowExampleAppCustomRendering(bool* p_open)
draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + thickness), col); x += sz + spacing; // Horizontal line (faster than AddLine, but only handle integer thickness)
draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x + thickness, y + sz), col); x += spacing * 2.0f;// Vertical line (faster than AddLine, but only handle integer thickness)
draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x + 1, y + 1), col); x += sz; // Pixel (faster than AddLine)
// Path
draw_list->PathArcTo(ImVec2(x + sz * 0.5f, y + sz * 0.5f), sz * 0.5f, 3.141592f * -0.5f, 3.141592f);
draw_list->PathFillConvex(col);
x += sz + spacing;
// Quadratic Bezier Curve (3 control points)
draw_list->PathLineTo(ImVec2(x + cp3[0].x, y + cp3[0].y));
draw_list->PathBezierQuadraticCurveTo(ImVec2(x + cp3[1].x, y + cp3[1].y), ImVec2(x + cp3[2].x, y + cp3[2].y), curve_segments);
draw_list->PathFillConvex(col);
x += sz + spacing;
// Cubic Bezier Curve (4 control points): this is concave so not drawing it yet
//draw_list->PathLineTo(ImVec2(x + cp4[0].x, y + cp4[0].y));
//draw_list->PathBezierCubicCurveTo(ImVec2(x + cp4[1].x, y + cp4[1].y), ImVec2(x + cp4[2].x, y + cp4[2].y), ImVec2(x + cp4[3].x, y + cp4[3].y), curve_segments);
//draw_list->PathFillConvex(col);
//x += sz + spacing;
draw_list->AddRectFilledMultiColor(ImVec2(x, y), ImVec2(x + sz, y + sz), IM_COL32(0, 0, 0, 255), IM_COL32(255, 0, 0, 255), IM_COL32(255, 255, 0, 255), IM_COL32(0, 255, 0, 255));
ImGui::Dummy(ImVec2((sz + spacing) * 11.2f, (sz + spacing) * 3.0f));
ImGui::Dummy(ImVec2((sz + spacing) * 12.2f, (sz + spacing) * 3.0f));
ImGui::PopItemWidth();
ImGui::EndTabItem();
}