Add substrate label to colorbar in svg plot

Also, add the substrate element to the template project's SVG element in the config file. set to enabled="false" so as not to force this

modules/PhysiCell_SVG.cpp

@@ -100,6 +100,17 @@ bool Write_SVG_text( std::ostream& os, const char* str , double position_x, doub
   return true; 
 }
 
+void Write_SVG_text(std::ostream& os, const char* str , double position_x, double position_y, double font_size , const char* color , const char* font, double rotation)
+{
+    double text_width = font_size * strlen(str) / 2.0;  // estimate the width of the text
+    double text_height = font_size / 2.0;  // estimate the height of the text
+
+    double center_x = position_x + text_width / 2.0;
+    double center_y = position_y + text_height / 2.0;
+
+    os << "<text x=\"" << position_x << "\" y=\"" << position_y << "\" font-size=\"" << font_size << "\" fill=\"" << color << "\" font-family=\"" << font << "\" transform=\"rotate(" << rotation << " " << center_x << " " << center_y << ")\">" << str << "</text>\n";
+}
+
 bool Write_SVG_circle( std::ostream& os, double center_x, double center_y, double radius, double stroke_size, 
                        std::string stroke_color , std::string fill_color )
 {

modules/PhysiCell_SVG.h

@@ -70,6 +70,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <string>
+#include <cstring>
 
 #ifndef _PhysiCell_SVG_h_
 #define _PhysiCell_SVG_h_
@@ -78,6 +79,8 @@ bool Write_SVG_start( std::ostream& os, double width, double height );
 bool Write_SVG_end( std::ostream& os );
 
 bool Write_SVG_text( std::ostream& os, const char* str , double position_x, double position_y, double font_size , const char* color , const char* font);
+void Write_SVG_text(std::ostream& os, const char* str , double position_x, double position_y, double font_size , const char* color , const char* font, double rotation);
+
 bool Write_SVG_circle( std::ostream& os, double center_x, double center_y, double radius, double stroke_size, std::string stroke_color , std::string fill_color );
 
 bool Write_SVG_rect( std::ostream& os , double UL_corner_x, double UL_corner_y, double width, double height,

modules/PhysiCell_pathology.cpp

@@ -762,6 +762,10 @@ void SVG_plot(std::string filename, Microenvironment &M, double z_slice, double
 					   PhysiCell_SVG_options.font_color.c_str(), PhysiCell_SVG_options.font.c_str()); // misterious values set with a trial and error approach due to OCD. But now the legend is coherent at pixel level
 
 		delete[] szString;
+
+		// add a label to the right of the colorbar defined by above Write_SVG_rect calls
+		Write_SVG_text(os, PhysiCell_settings.substrate_to_monitor.c_str(), upper_left_x + 35, top_margin + plot_height / 2, font_size,
+					   PhysiCell_SVG_options.font_color.c_str(), PhysiCell_SVG_options.font.c_str(), 90.0);
 	}
 
 	Write_SVG_rect(os, 25.0 + plot_width, top_margin, 25.0, plot_height - 25, 0.002 * plot_height, "black", "none"); // nice black contour around the legend

sample_projects/template/config/PhysiCell_settings.xml

@@ -111,6 +111,12 @@
 		<SVG>
 			<interval units="min">60</interval>
 			<enable>true</enable>
+			<plot_substrate enabled="false" limits="true">
+                <substrate>substrate</substrate>
+                <colormap>YlOrRd</colormap>
+                <min_conc>0</min_conc>
+                <max_conc>1</max_conc>
+            </plot_substrate>
 		</SVG>
 
 		<legacy_data>