From e76e521e9e1b8ca7cb373b44ec50fb846840565c Mon Sep 17 00:00:00 2001
From: nds <natalia.donis@opencascade.com>
Date: Tue, 28 Apr 2015 13:56:19 +0300
Subject: [PATCH] A colors palette for multi-color.

---
 src/ModelAPI/ModelAPI_Tools.cpp | 78 +++++++++++++++++++++++++++++----
 1 file changed, 69 insertions(+), 9 deletions(-)

diff --git a/src/ModelAPI/ModelAPI_Tools.cpp b/src/ModelAPI/ModelAPI_Tools.cpp
index 3564dce7c..581471df3 100644
--- a/src/ModelAPI/ModelAPI_Tools.cpp
+++ b/src/ModelAPI/ModelAPI_Tools.cpp
@@ -60,23 +60,83 @@ bool findVariable(const std::string& theName, double& outValue)
 
 static std::map<int, std::vector<int> > myColorMap;
 
-std::vector<int> vectorOfValues(const int theRed, const int theGreen, const int theBlue)
+void appendValues(std::vector<int>& theRGB, const int theRed, const int theGreen, const int theBlue)
 {
-  std::vector<int> aValues;
-  aValues.push_back(theRed);
-  aValues.push_back(theGreen);
-  aValues.push_back(theBlue);
+  theRGB.push_back(theRed);
+  theRGB.push_back(theGreen);
+  theRGB.push_back(theBlue);
+}
+
+bool containsValues(std::map<int, std::vector<int> >& theColorMap, std::vector<int>& theValues)
+{
+  std::map<int, std::vector<int> >::const_iterator anIt = theColorMap.begin(), aLast = theColorMap.end();
+  bool isFound = false;
+  for (; anIt != aLast && !isFound; anIt++) {
+    std::vector<int> aValues = anIt->second;
+    isFound = aValues[0] == theValues[0] &&
+              aValues[1] == theValues[1] &&
+              aValues[2] == theValues[2];
+  }
+  return isFound;
+}
+
+std::vector<int> HSVtoRGB(int theH, int theS, int theV)
+{
+  std::vector<int> aRGB;
+  if (theH < 0 || theH > 360 ||
+      theS < 0 || theS > 100 ||
+      theV < 0 || theV > 100)
+    return aRGB;
+
+  int aHi = (int)theH/60;
 
-  return aValues;
+  double aV = theV;
+  double aVmin = (100 - theS)*theV/100;
+
+  double anA = (theV - aVmin)* (theH % 60) / 60;
+
+  double aVinc = aVmin + anA;
+  double aVdec = theV - anA;
+
+  double aPercentToValue = 255./100;
+  aV    *= aPercentToValue;
+  aVinc *= aPercentToValue;
+  aVmin *= aPercentToValue;
+  aVdec *= aPercentToValue;
+
+  switch(aHi) {
+    case 0: appendValues(aRGB, aV,    aVinc, aVmin); break;
+    case 1: appendValues(aRGB, aVdec, aV,    aVmin); break;
+    case 2: appendValues(aRGB, aVmin, aV,    aVinc); break;
+    case 3: appendValues(aRGB, aVmin, aVdec, aV); break;
+    case 4: appendValues(aRGB, aVinc, aVmin, aV); break;
+    case 5: appendValues(aRGB, aV,    aVmin, aVdec); break;
+    default: break;
+  }
+  return aRGB;
 }
 
+
 void fillColorMap()
 {
   if (!myColorMap.empty())
     return;
-  myColorMap[0] = vectorOfValues(127, 51, 0);
-  myColorMap[1] = vectorOfValues(0, 38, 225);
-  myColorMap[2] = vectorOfValues(255, 0, 0);
+
+  int i = 0;
+  for (int s = 100; s > 0; s = s - 50)
+  {
+    for (int v = 100; v >= 40; v = v - 20)
+    {
+      for (int h = 0; h < 359 ; h = h + 60)
+      {
+        std::vector<int> aColor = HSVtoRGB(h, s, v);
+        if (containsValues(myColorMap, aColor))
+          continue;
+        myColorMap[i] = aColor;
+        i++;
+      }
+    }
+  }
 }
 
 void findRandomColor(std::vector<int>& theValues)
-- 
2.39.2