C++ - ImGUI Renk Seçici

Client

Kullanıcı
Katılım
30 Nis 2022
Mesajlar
22
Tepkime puanı
1
Puanları
3
C++:
bool ColorPicker(const char* label, ImColor* color)
        {
            static const float HUE_PICKER_WIDTH = 20.0f;
            static const float CROSSHAIR_SIZE = 7.0f;
            static const ImVec2 SV_PICKER_SIZE = ImVec2(200, 200);
    
            bool value_changed = false;
    
            ImDrawList* draw_list = ImGui::GetWindowDrawList();
    
            ImVec2 picker_pos = ImGui::GetCursorScreenPos();
    
            ImColor colors[] = {ImColor(255, 0, 0),
                ImColor(255, 255, 0),
                ImColor(0, 255, 0),
                ImColor(0, 255, 255),
                ImColor(0, 0, 255),
                ImColor(255, 0, 255),
                ImColor(255, 0, 0)};
    
            for (int i = 0; i < 6; ++i)
            {
                draw_list->AddRectFilledMultiColor(
                    ImVec2(picker_pos.x + SV_PICKER_SIZE.x + 10, picker_pos.y + i * (SV_PICKER_SIZE.y / 6)),
                    ImVec2(picker_pos.x + SV_PICKER_SIZE.x + 10 + HUE_PICKER_WIDTH,
                        picker_pos.y + (i + 1) * (SV_PICKER_SIZE.y / 6)),
                    colors[i],
                    colors[i],
                    colors[i + 1],
                    colors[i + 1]);
            }
    
            float hue, saturation, value;
            ImGui::ColorConvertRGBtoHSV(
                color->Value.x, color->Value.y, color->Value.z, hue, saturation, value);
            auto hue_color = ImColor::HSV(hue, 1, 1);
    
            draw_list->AddLine(
                ImVec2(picker_pos.x + SV_PICKER_SIZE.x + 8, picker_pos.y + hue * SV_PICKER_SIZE.y),
                ImVec2(picker_pos.x + SV_PICKER_SIZE.x + 12 + HUE_PICKER_WIDTH,
                    picker_pos.y + hue * SV_PICKER_SIZE.y),
                ImColor(255, 255, 255));
    
            draw_list->AddTriangleFilledMultiColor(picker_pos,
                ImVec2(picker_pos.x + SV_PICKER_SIZE.x, picker_pos.y + SV_PICKER_SIZE.y),
                ImVec2(picker_pos.x, picker_pos.y + SV_PICKER_SIZE.y),
                ImColor(0, 0, 0),
                hue_color,
                ImColor(255, 255, 255));
    
            float x = saturation * value;
            ImVec2 p(picker_pos.x + x * SV_PICKER_SIZE.x, picker_pos.y + value * SV_PICKER_SIZE.y);
            draw_list->AddLine(ImVec2(p.x - CROSSHAIR_SIZE, p.y), ImVec2(p.x - 2, p.y), ImColor(255, 255, 255));
            draw_list->AddLine(ImVec2(p.x + CROSSHAIR_SIZE, p.y), ImVec2(p.x + 2, p.y), ImColor(255, 255, 255));
            draw_list->AddLine(ImVec2(p.x, p.y + CROSSHAIR_SIZE), ImVec2(p.x, p.y + 2), ImColor(255, 255, 255));
            draw_list->AddLine(ImVec2(p.x, p.y - CROSSHAIR_SIZE), ImVec2(p.x, p.y - 2), ImColor(255, 255, 255));
    
            ImGui::InvisibleButton("saturation_value_selector", SV_PICKER_SIZE);
            if (ImGui::IsItemHovered())
            {
                ImVec2 mouse_pos_in_canvas = ImVec2(
                    ImGui::GetIO().MousePos.x - picker_pos.x, ImGui::GetIO().MousePos.y - picker_pos.y);
                if (ImGui::GetIO().MouseDown[0])
                {
                    mouse_pos_in_canvas.x =
                        ImMin(mouse_pos_in_canvas.x, mouse_pos_in_canvas.y);
    
                    value = mouse_pos_in_canvas.y / SV_PICKER_SIZE.y;
                    saturation = value == 0 ? 0 : (mouse_pos_in_canvas.x / SV_PICKER_SIZE.x) / value;
                    value_changed = true;
                }
            }
    
            ImGui::SetCursorScreenPos(ImVec2(picker_pos.x + SV_PICKER_SIZE.x + 10, picker_pos.y));
            ImGui::InvisibleButton("hue_selector", ImVec2(HUE_PICKER_WIDTH, SV_PICKER_SIZE.y));
    
            if (ImGui::IsItemHovered())
            {
                if (ImGui::GetIO().MouseDown[0])
                {
                    hue = ((ImGui::GetIO().MousePos.y - picker_pos.y) / SV_PICKER_SIZE.y);
                    value_changed = true;
                }
            }
    
            *color = ImColor::HSV(hue, saturation, value);
            return value_changed | ImGui::ColorEdit3(label, &color->Value.x);
        }
 

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