Added option to change the line color for plots and bar color for histograms in the histogram container (#4859)

Signed-off-by: Benjamin Jillich <jillich@amazon.com>

Gems/ImGui/Code/Include/LYImGuiUtils/HistogramContainer.h

@@ -85,6 +85,10 @@ namespace ImGui
             //! Calculate the min and maximum values for the present samples.
             void CalcMinMaxValues(float& outMin, float& outMax);
 
+            //! Set/get color used by either the lines in case ViewType is Lines or bars in case or Histogram.
+            void SetBarLineColor(const ImColor& color) { m_barLineColor = color; }
+            ImColor GetBarLineColor() const  { return m_barLineColor; }
+
         private:
             // Set the Max Size and clear the container
             void SetMaxSize(int size);
@@ -99,6 +103,7 @@ namespace ImGui
             bool m_dispalyOverlays;
             ScaleMode m_scaleMode; //! Determines if the vertical range of the histogram will be manually specified, auto-expanded or automatically scaled based on the samples.
             float m_autoScaleSpeed = 0.05f; //! Indicates how fast the min max values and the visible vertical range are adapting to new samples.
+            ImColor m_barLineColor = ImColor(66, 166, 178); //! Color used by either the lines in case ViewType is Lines or bars in case or Histogram.
             bool m_collapsed;
             bool m_drawMostRecentValueText;
         };

Gems/ImGui/Code/Source/LYImGuiUtils/HistogramContainer.cpp

@@ -147,6 +147,8 @@ namespace ImGui
             float imGuiHistoWidgetHeight = m_collapsed ? histogramHeight : (histogramHeight - 15);
             if (GetSize() > 0)
             {
+                ImGui::PushStyleColor(ImGuiCol_PlotHistogram, m_barLineColor.Value);
+
                 switch (m_viewType)
                 {
                     default:
@@ -160,6 +162,8 @@ namespace ImGui
                         ImGui::PlotLines(AZStd::string::format("##%s_lines", m_histogramName.c_str()).c_str(), ImGui::LYImGuiUtils::s_histogramContainerGetter, this, GetSize(), 0, m_histogramName.c_str(), m_minScale, m_maxScale, ImVec2(histogramWidth - 10, imGuiHistoWidgetHeight));
                         break;
                 }
+
+                ImGui::PopStyleColor();
             }