improved bars

examples/example_hud/gui/main_window.cpp

@@ -251,7 +251,6 @@ namespace imgui_desktop::gui
         const auto box_gradient_bottom = animated_color(m_box_gradient_bottom, 0.5f);
         const auto red = omath::Color{1.f, 0.f, 0.f, 1.f};
         const auto green = omath::Color{0.f, 1.f, 0.f, 1.f};
-        const auto bar_value_color = omath::Color{red.value() * (1.f - m_bar_value) + green.value() * m_bar_value};
         const auto make_glow = [](const GlowSettings& settings) -> std::optional<Glow>
         {
             if (!settings.enabled)
@@ -263,16 +262,8 @@ namespace imgui_desktop::gui
         const auto bar_glow = make_glow(m_bar_glow);
         const auto label_glow = make_glow(m_label_glow);
         const auto canvas_glow = make_glow(m_canvas_glow);
-        const Paint vertical_bar_color =
-                m_gradient_bars ? Paint{omath::hud::Gradient{bar_value_color, bar_value_color, red, red}}
-                                : Paint{m_bar_color};
-        const Paint horizontal_bar_color =
-                m_gradient_bars ? Paint{omath::hud::Gradient{red, bar_value_color, bar_value_color, red}}
-                                : Paint{m_bar_color};
-        const Bar vertical_bar{vertical_bar_color, m_bar_outline_color, m_bar_bg_color, m_bar_width,
-                               m_bar_value,        m_bar_offset,        bar_glow};
-        const Bar horizontal_bar{horizontal_bar_color, m_bar_outline_color, m_bar_bg_color, m_bar_width,
-                                 m_bar_value,          m_bar_offset,        bar_glow};
+        const BarPaint bar_color = m_gradient_bars ? BarPaint{BarGradient{red, green}} : BarPaint{m_bar_color};
+        const Bar bar{bar_color, m_bar_outline_color, m_bar_bg_color, m_bar_width, m_bar_value, m_bar_offset, bar_glow};
         const Paint box_fill = m_gradient_box_fill
                                        ? Paint{omath::hud::Gradient{box_gradient_top, box_gradient_top,
                                                                     box_gradient_bottom, box_gradient_bottom}}
@@ -299,7 +290,7 @@ namespace imgui_desktop::gui
                                          m_corner_ratio, m_box_thickness, cornered_box_glow}),
                         when(m_show_dashed_box, DashedBox{m_dash_color, m_dash_len, m_dash_gap, m_dash_thickness}),
                         RightSide{
-                                when(m_show_right_bar, vertical_bar),
+                                when(m_show_right_bar, bar),
                                 when(m_show_right_dashed_bar, dbar),
                                 when(m_show_right_labels, Label{{0.f, 1.f, 0.f, 1.f},
                                                                 m_label_offset,
@@ -319,7 +310,7 @@ namespace imgui_desktop::gui
                                                                m_ring_thickness, m_ring_offset}),
                         },
                         LeftSide{
-                                when(m_show_left_bar, vertical_bar),
+                                when(m_show_left_bar, bar),
                                 when(m_show_left_dashed_bar, dbar),
                                 when(m_show_left_labels,
                                      Label{omath::Color::from_rgba(255, 128, 0, 255), m_label_offset,
@@ -329,7 +320,7 @@ namespace imgui_desktop::gui
                                            outline_helper(m_outlined), "Level: 42"}),
                         },
                         TopSide{
-                                when(m_show_top_bar, horizontal_bar),
+                                when(m_show_top_bar, bar),
                                 when(m_show_top_dashed_bar, dbar),
                                 when(m_show_centered_top,
                                      Centered{Label{omath::Color::from_rgba(0, 255, 255, 255), m_label_offset,
@@ -340,7 +331,7 @@ namespace imgui_desktop::gui
                                                               outline_helper(m_outlined), "*BLEEDING*"}),
                         },
                         BottomSide{
-                                when(m_show_bottom_bar, horizontal_bar),
+                                when(m_show_bottom_bar, bar),
                                 when(m_show_bottom_dashed_bar, dbar),
                                 when(m_show_centered_bottom,
                                      Centered{Label{centered_label_color, m_label_offset, outline_helper(m_outlined),

include/omath/hud/entity_overlay.hpp

@@ -41,19 +41,19 @@ namespace omath::hud
                                       float thickness = 1.f);
 
         // ── Bars ─────────────────────────────────────────────────────────
-        EntityOverlay& add_right_bar(const widget::Paint& color, const Color& outline_color, const Color& bg_color,
+        EntityOverlay& add_right_bar(const widget::BarPaint& color, const Color& outline_color, const Color& bg_color,
                                      float width, float ratio, float offset = 5.f,
                                      const std::optional<widget::Glow>& glow = std::nullopt);
 
-        EntityOverlay& add_left_bar(const widget::Paint& color, const Color& outline_color, const Color& bg_color,
+        EntityOverlay& add_left_bar(const widget::BarPaint& color, const Color& outline_color, const Color& bg_color,
                                     float width, float ratio, float offset = 5.f,
                                     const std::optional<widget::Glow>& glow = std::nullopt);
 
-        EntityOverlay& add_top_bar(const widget::Paint& color, const Color& outline_color, const Color& bg_color,
+        EntityOverlay& add_top_bar(const widget::BarPaint& color, const Color& outline_color, const Color& bg_color,
                                    float height, float ratio, float offset = 5.f,
                                    const std::optional<widget::Glow>& glow = std::nullopt);
 
-        EntityOverlay& add_bottom_bar(const widget::Paint& color, const Color& outline_color, const Color& bg_color,
+        EntityOverlay& add_bottom_bar(const widget::BarPaint& color, const Color& outline_color, const Color& bg_color,
                                       float height, float ratio, float offset = 5.f,
                                       const std::optional<widget::Glow>& glow = std::nullopt);
 
@@ -272,6 +272,8 @@ namespace omath::hud
         void draw_canvas_glow(const widget::CanvasGlow& canvas_glow) const;
         void draw_filled_rectangle(const Vector2<float>& min, const Vector2<float>& max,
                                    const widget::Paint& paint) const;
+        [[nodiscard]]
+        static widget::Paint resolve_bar_paint(const widget::BarPaint& paint, float ratio, bool vertical);
         void draw_dashed_line(const Vector2<float>& from, const Vector2<float>& to, const Color& color, float dash_len,
                               float gap_len, float thickness) const;
         void draw_dashed_fill(const Vector2<float>& origin, const Vector2<float>& step_dir,

include/omath/hud/entity_overlay_widgets.hpp

@@ -9,6 +9,7 @@
 #include <initializer_list>
 #include <optional>
 #include <string_view>
+#include <type_traits>
 #include <variant>
 
 namespace omath::hud::widget
@@ -23,6 +24,32 @@ namespace omath::hud::widget
         }
     };
 
+    struct BarGradient
+    {
+        Color empty_color;
+        Color full_color;
+    };
+
+    struct BarPaint : std::variant<Color, Gradient, BarGradient>
+    {
+        using std::variant<Color, Gradient, BarGradient>::variant;
+
+        constexpr BarPaint(const float red, const float green, const float blue, const float alpha)
+            : std::variant<Color, Gradient, BarGradient>(Color{red, green, blue, alpha})
+        {
+        }
+
+        BarPaint(const Paint& paint)
+        {
+            std::visit(
+                    [this](const auto& value)
+                    {
+                        this->template emplace<std::decay_t<decltype(value)>>(value);
+                    },
+                    paint);
+        }
+    };
+
     // ── Overloaded helper for std::visit ──────────────────────────────────────
     template<typename... Ts>
     struct Overloaded : Ts...
@@ -124,7 +151,7 @@ namespace omath::hud::widget
     /// A filled bar. `size` is width for left/right sides, height for top/bottom.
     struct Bar
     {
-        Paint color;
+        BarPaint color;
         Color outline;
         Color bg;
         float size;

source/hud/entity_overlay.cpp

@@ -77,7 +77,7 @@ namespace omath::hud
 
         return *this;
     }
-    EntityOverlay& EntityOverlay::add_right_bar(const widget::Paint& color, const Color& outline_color,
+    EntityOverlay& EntityOverlay::add_right_bar(const widget::BarPaint& color, const Color& outline_color,
                                                 const Color& bg_color, const float width, float ratio,
                                                 const float offset, const std::optional<widget::Glow>& glow)
     {
@@ -91,14 +91,14 @@ namespace omath::hud
         m_renderer->add_filled_rectangle(bar_min, bar_max, bg_color);
 
         draw_glow_rectangle(fill_min, bar_max, glow);
-        draw_filled_rectangle(fill_min, bar_max, color);
+        draw_filled_rectangle(fill_min, bar_max, resolve_bar_paint(color, ratio, true));
         m_renderer->add_rectangle(bar_min, bar_max, outline_color);
 
         m_text_cursor_right.x += offset + width;
 
         return *this;
     }
-    EntityOverlay& EntityOverlay::add_left_bar(const widget::Paint& color, const Color& outline_color,
+    EntityOverlay& EntityOverlay::add_left_bar(const widget::BarPaint& color, const Color& outline_color,
                                                const Color& bg_color, const float width, float ratio,
                                                const float offset, const std::optional<widget::Glow>& glow)
     {
@@ -112,7 +112,7 @@ namespace omath::hud
         m_renderer->add_filled_rectangle(bar_min, bar_max, bg_color);
 
         draw_glow_rectangle(fill_min, bar_max, glow);
-        draw_filled_rectangle(fill_min, bar_max, color);
+        draw_filled_rectangle(fill_min, bar_max, resolve_bar_paint(color, ratio, true));
         m_renderer->add_rectangle(bar_min, bar_max, outline_color);
 
         m_text_cursor_left.x -= offset + width;
@@ -139,7 +139,7 @@ namespace omath::hud
 
         return *this;
     }
-    EntityOverlay& EntityOverlay::add_top_bar(const widget::Paint& color, const Color& outline_color,
+    EntityOverlay& EntityOverlay::add_top_bar(const widget::BarPaint& color, const Color& outline_color,
                                               const Color& bg_color, const float height, float ratio,
                                               const float offset, const std::optional<widget::Glow>& glow)
     {
@@ -153,7 +153,7 @@ namespace omath::hud
         m_renderer->add_filled_rectangle(bar_min, bar_max, bg_color);
 
         draw_glow_rectangle(bar_min, fill_max, glow);
-        draw_filled_rectangle(bar_min, fill_max, color);
+        draw_filled_rectangle(bar_min, fill_max, resolve_bar_paint(color, ratio, false));
         m_renderer->add_rectangle(bar_min, bar_max, outline_color);
 
         m_text_cursor_top.y -= offset + height;
@@ -552,7 +552,33 @@ namespace omath::hud
                 },
                 paint);
     }
-    EntityOverlay& EntityOverlay::add_bottom_bar(const widget::Paint& color, const Color& outline_color,
+
+    widget::Paint EntityOverlay::resolve_bar_paint(const widget::BarPaint& paint, const float ratio,
+                                                   const bool vertical)
+    {
+        return std::visit(
+                widget::Overloaded{
+                        [](const Color& color) -> widget::Paint
+                        {
+                            return color;
+                        },
+                        [](const Gradient& gradient) -> widget::Paint
+                        {
+                            return gradient;
+                        },
+                        [&](const widget::BarGradient& gradient) -> widget::Paint
+                        {
+                            const float value = std::clamp(ratio, 0.f, 1.f);
+                            const auto current = Color{gradient.empty_color.value() * (1.f - value)
+                                                       + gradient.full_color.value() * value};
+                            if (vertical)
+                                return Gradient{current, current, gradient.empty_color, gradient.empty_color};
+                            return Gradient{gradient.empty_color, current, current, gradient.empty_color};
+                        },
+                },
+                paint);
+    }
+    EntityOverlay& EntityOverlay::add_bottom_bar(const widget::BarPaint& color, const Color& outline_color,
                                                  const Color& bg_color, const float height, float ratio,
                                                  const float offset, const std::optional<widget::Glow>& glow)
     {
@@ -565,7 +591,7 @@ namespace omath::hud
         const auto fill_max = bar_start + Vector2<float>{max_bar_width * ratio, height};
         m_renderer->add_filled_rectangle(bar_min, bar_max, bg_color);
         draw_glow_rectangle(bar_min, fill_max, glow);
-        draw_filled_rectangle(bar_min, fill_max, color);
+        draw_filled_rectangle(bar_min, fill_max, resolve_bar_paint(color, ratio, false));
         m_renderer->add_rectangle(bar_min, bar_max, outline_color);
 
         m_text_cursor_bottom.y += offset + height;