From 66bdf04511e9ab999ea167fd3fa729f26c04bd93 Mon Sep 17 00:00:00 2001
From: Patrick Shriwise <pshriwise@gmail.com>
Date: Tue, 30 Oct 2018 22:30:45 -0500
Subject: [PATCH] Updating RGBColor to a char array.

---
 include/openmc/plot.h |  2 +-
 src/plot.cpp          | 15 +++++++++++----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/include/openmc/plot.h b/include/openmc/plot.h
index a3e527456..8d9a11ff9 100644
--- a/include/openmc/plot.h
+++ b/include/openmc/plot.h
@@ -35,7 +35,7 @@ extern std::vector<Plot> plots; //!< Plot instance container
 // RGBColor holds color information for plotted objects
 //===============================================================================
 
-typedef std::array<int, 3> RGBColor;
+typedef std::array<char, 3> RGBColor;
  
 typedef xt::xtensor<RGBColor, 2> ImageData;
 
diff --git a/src/plot.cpp b/src/plot.cpp
index e1cbdb2d1..d6f54b90a 100644
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -1,4 +1,5 @@
 #include <fstream>
+#include <sstream>
 
 #include "openmc/plot.h"
 #include "openmc/constants.h"
@@ -22,6 +23,12 @@ namespace openmc {
 // Global variables
 //==============================================================================
 
+const char* to_char(int i) {
+    std::stringstream s;
+    s << i;
+    return s.str().c_str();
+  }
+  
 int PLOT_LEVEL_LOWEST = -1;
 
 std::unordered_map<int, int> plot_map;
@@ -30,7 +37,7 @@ int n_plots;
 
 std::vector<Plot> plots;
 
-const RGBColor WHITE = {255, 255, 255};
+const RGBColor WHITE = {static_cast<char>(255), static_cast<char>(255), static_cast<char>(255)};
 const RGBColor NULLRGB = {0, 0, 0};
 
 //==============================================================================
@@ -734,9 +741,9 @@ void output_ppm(Plot pl, const ImageData& data)
   for (int y = 0; y < pl.pixels_[1]; y++) {
     for (int x = 0; x < pl.pixels_[0]; x++) {
       RGBColor rgb = data(x,y);
-      of.write(reinterpret_cast<char*>(&rgb[RED]), 1);
-      of.write(reinterpret_cast<char*>(&rgb[GREEN]), 1);
-      of.write(reinterpret_cast<char*>(&rgb[BLUE]), 1);
+      of.write(&rgb[RED], 1);
+      of.write(&rgb[GREEN], 1);
+      of.write(&rgb[BLUE], 1);
     }
   }
   // Close file