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Improve on automatic circle segment count calculation. (#3808)

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thedmd
2021-02-17 12:55:25 +01:00
committed by ocornut
parent b47aa46d81
commit f107693d9b
5 changed files with 80 additions and 32 deletions
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40
imgui_demo.cpp
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@ -6034,22 +6034,44 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
if (style.CurveTessellationTol < 0.10f) style.CurveTessellationTol = 0.10f;
// When editing the "Circle Segment Max Error" value, draw a preview of its effect on auto-tessellated circles.
ImGui::DragFloat("Circle Segment Max Error", &style.CircleSegmentMaxError, 0.01f, 0.10f, 10.0f, "%.2f");
ImGui::DragFloat("Circle Tessellation Max Error", &style.CircleTessellationMaxError , 0.005f, 0.10f, 10.0f, "%.2f", ImGuiSliderFlags_AlwaysClamp);
if (ImGui::IsItemActive())
{
ImGui::SetNextWindowPos(ImGui::GetCursorScreenPos());
ImGui::BeginTooltip();
ImVec2 p = ImGui::GetCursorScreenPos();
ImGui::TextUnformatted("N - number of segments");
ImGui::TextUnformatted("R - radius");
ImGui::Spacing();
ImDrawList* draw_list = ImGui::GetWindowDrawList();
float RAD_MIN = 10.0f, RAD_MAX = 80.0f;
float off_x = 10.0f;
for (int n = 0; n < 7; n++)
const float min_widget_width = ImGui::CalcTextSize("N: MM\nR: MM.MM").x;
float RAD_MIN = 5.0f, RAD_MAX = 80.0f;
for (int n = 0; n < 9; n++)
{
const float rad = RAD_MIN + (RAD_MAX - RAD_MIN) * (float)n / (7.0f - 1.0f);
draw_list->AddCircle(ImVec2(p.x + off_x + rad, p.y + RAD_MAX), rad, ImGui::GetColorU32(ImGuiCol_Text), 0);
off_x += 10.0f + rad * 2.0f;
const float rad = RAD_MIN + (RAD_MAX - RAD_MIN) * (float)n / (9.0f - 1.0f);
const int segment_count = draw_list->_CalcCircleAutoSegmentCount(rad);
ImGui::BeginGroup();
ImGui::Text("R: %.f", rad);
ImGui::Text("N: %d", segment_count);
const float circle_diameter = rad * 2.0f;
const float canvas_width = IM_MAX(min_widget_width, circle_diameter);
const float offset_x = floorf(canvas_width * 0.5f);
const float offset_y = floorf(RAD_MAX);
const ImVec2 p = ImGui::GetCursorScreenPos();
draw_list->AddCircle(ImVec2(p.x + offset_x, p.y + offset_y), rad, ImGui::GetColorU32(ImGuiCol_Text));
ImGui::Dummy(ImVec2(canvas_width, RAD_MAX * 2));
ImGui::Text("N: %d", segment_count);
const ImVec2 p2 = ImGui::GetCursorScreenPos();
draw_list->AddCircleFilled(ImVec2(p2.x + offset_x, p2.y + offset_y), rad, ImGui::GetColorU32(ImGuiCol_Text));
ImGui::Dummy(ImVec2(canvas_width, RAD_MAX * 2));
ImGui::EndGroup();
ImGui::SameLine();
}
ImGui::Dummy(ImVec2(off_x, RAD_MAX * 2.0f));
ImGui::EndTooltip();
}
ImGui::SameLine();