added gradient dir

examples/example_hud/gui/main_window.cpp

@@ -161,6 +161,12 @@ namespace imgui_desktop::gui
                                   ImGuiColorEditFlags_NoInputs);
                 ImGui::ColorEdit4("Gradient right##lbl", reinterpret_cast<float*>(&m_label_gradient_right),
                                   ImGuiColorEditFlags_NoInputs);
+                if (m_animate_gradients)
+                {
+                    int direction = static_cast<int>(m_label_gradient_direction);
+                    if (ImGui::Combo("Direction##lbl", &direction, "Right to left\0Left to right\0"))
+                        m_label_gradient_direction = static_cast<omath::hud::GradientDirection>(direction);
+                }
             }
             ImGui::SliderFloat("Offset##lbl", &m_label_offset, 0.f, 15.f);
             ImGui::Checkbox("Right##lbl", &m_show_right_labels);
@@ -309,7 +315,8 @@ namespace imgui_desktop::gui
         const Paint centered_label_color =
                 m_gradient_label ? Paint{omath::hud::Gradient{m_label_gradient_left, m_label_gradient_right,
                                                               m_label_gradient_right, m_label_gradient_left,
-                                                              m_animate_gradients}}
+                                                              m_animate_gradients, 4.f, 0.7f,
+                                                              m_label_gradient_direction}}
                                  : Paint{omath::Color::from_rgba(255, 255, 255, 255)};
 
         auto outline_helper = [](const bool is_outline) -> Outlined

examples/example_hud/gui/main_window.hpp

@@ -68,6 +68,7 @@ namespace imgui_desktop::gui
         omath::Color m_label_gradient_right{1.f, 0.2f, 0.7f, 1.f};
         bool m_outlined = true;
         bool m_gradient_label = true;
+        omath::hud::GradientDirection m_label_gradient_direction = omath::hud::GradientDirection::RightToLeft;
         bool m_show_right_labels = true, m_show_left_labels = true;
         bool m_show_top_labels = true, m_show_bottom_labels = true;
         bool m_show_centered_top = true, m_show_centered_bottom = true;

include/omath/hud/gradient.hpp

@@ -3,6 +3,12 @@
 
 namespace omath::hud
 {
+    enum class GradientDirection
+    {
+        RightToLeft,
+        LeftToRight,
+    };
+
     struct Gradient
     {
         Color top_left;
@@ -12,5 +18,6 @@ namespace omath::hud
         bool animated = false;
         float animation_speed = 4.f;
         float animation_spread = 0.7f;
+        GradientDirection direction = GradientDirection::RightToLeft;
     };
 } // namespace omath::hud

source/hud/renderer_realizations/imgui_renderer.cpp

@@ -103,6 +103,7 @@ namespace omath::hud
         if (gradient.animated)
         {
             const float animation_offset = static_cast<float>(ImGui::GetTime()) * gradient.animation_speed;
+            const float direction = gradient.direction == GradientDirection::RightToLeft ? 1.f : -1.f;
             float cursor_x = position.x;
             const char* glyph_start = text.data();
             const char* const text_end = text.data() + text.size();
@@ -117,7 +118,9 @@ namespace omath::hud
 
                 const char* const glyph_end = glyph_start + glyph_size;
                 const float blend =
-                        (std::sin(animation_offset + static_cast<float>(glyph_index) * gradient.animation_spread) + 1.f)
+                        (std::sin(animation_offset + direction * static_cast<float>(glyph_index)
+                                                             * gradient.animation_spread)
+                         + 1.f)
                         * 0.5f;
                 const auto color = gradient.top_left.value() * (1.f - blend) + gradient.top_right.value() * blend;
                 draw_list->AddText({cursor_x, position.y}, Color{color}.to_im_color(), glyph_start, glyph_end);