1 files changed, 76 insertions, 0 deletions

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+#include "color.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <ostream>
+#include <sstream>
+
+// Constants
+const Color Color::White = Color(1,1,1,1);
+const Color Color::Black = Color(0,0,0,1);
+
+Color::Color(const unsigned char* arr)
+{
+  float inv = 1.0 / 255.0;
+  r = arr[0] * inv;
+  g = arr[1] * inv;
+  b = arr[2] * inv;
+  a = 1.0;
+}
+
+Color Color::fromHex(const char* s)
+{
+  // If the color is "none", return any color
+  // with alpha zero (completely transparent).
+  if(!strcmp(s, "none"))
+  {
+    return Color(0,0,0,0);
+  }
+
+  // Ignore leading hashmark.
+  if(s[0] == '#')
+  {
+    s++;
+  }
+
+  // Set stream formatting to hexadecimal.
+  std::stringstream ss;
+  ss << std::hex;
+
+  // Convert to integer.
+  unsigned int rgb;
+  ss << s;
+  ss >> rgb;
+
+  // Extract 8-byte chunks and normalize.
+  Color c;
+  c.r = (float)( ( rgb & 0xFF0000 ) >> 16 ) / 255.0;
+  c.g = (float)( ( rgb & 0x00FF00 ) >>  8 ) / 255.0;
+  c.b = (float)( ( rgb & 0x0000FF ) >>  0 ) / 255.0;
+  c.a = 1.0; // set alpha to 1 (opaque) by default
+
+  return c;
+}
+
+std::string Color::toHex() const
+{
+  int R = (unsigned char) std::max( 0., std::min( 255.0, 255.0 * r ));
+  int G = (unsigned char) std::max( 0., std::min( 255.0, 255.0 * g ));
+  int B = (unsigned char) std::max( 0., std::min( 255.0, 255.0 * b ));
+
+  std::stringstream ss;
+  ss << std::hex;
+
+  ss << R << G << B;
+  return ss.str();
+}
+
+std::ostream& operator<<(std::ostream& os, const Color& c)
+{
+  os << "(r=" << c.r;
+  os << " g=" << c.g;
+  os << " b=" << c.b;
+  os << " a=" << c.a;
+  os << ")";
+  return os;
+}