From 853edb23512e9e7c180134be3ddb29c37601a8b3 Mon Sep 17 00:00:00 2001
From: stv <stv@opencascade.com>
Date: Mon, 6 Jun 2005 08:18:38 +0000
Subject: [PATCH] Methods Qtx::scaleColor() and Qtx::scaleColors() were added.

---
 src/Qtx/Qtx.cxx           | 39 +++++++++++++++++++++++++++++++++++++++
 src/Qtx/Qtx.h             |  3 +++
 src/Qtx/QtxColorScale.cxx | 27 +--------------------------
 src/Qtx/QtxColorScale.h   |  1 -
 4 files changed, 43 insertions(+), 27 deletions(-)

diff --git a/src/Qtx/Qtx.cxx b/src/Qtx/Qtx.cxx
index f2d31bd8c..884d81155 100755
--- a/src/Qtx/Qtx.cxx
+++ b/src/Qtx/Qtx.cxx
@@ -499,3 +499,42 @@ void Qtx::rgbSet( const int rgb, int& r, int& g, int& b )
   g = ( rgb >> 8 ) & 0xff;
   b = rgb & 0xff;
 }
+
+/*!
+	Name: scaleColor [static public]
+	Desc: Returns the color specified by the index between min (blue) and max (red).
+*/
+QColor Qtx::scaleColor( const int index, const int min, const int max )
+{
+  static const int HUE[10] = {230, 210, 195, 180, 160, 80, 60, 50, 30, 0};
+
+  int hue = HUE[0];
+
+	if ( min != max )
+  {
+    double aPosition = 9.0 * ( index - min ) / ( max - min );
+    if ( aPosition > 0.0 )
+    {
+      if ( aPosition >= 9.0 )
+        hue = HUE[9];
+      else
+      {
+        int idx = (int)aPosition;
+        hue = HUE[idx] + int( ( aPosition - idx ) * ( HUE[idx + 1] - HUE[idx] ) );
+      }
+    }
+  }
+
+  return QColor( hue, 255, 255, QColor::Hsv );
+}
+
+/*!
+	Name: scaleColors [static public]
+	Desc: Returns the 'num' number of colors from blue to red.
+*/
+void Qtx::scaleColors( const int num, QValueList<QColor>& lst )
+{
+  lst.clear();
+  for ( int i = 0; i < num; i++ )
+    lst.append( scaleColor( i, 0, num - 1 ) );
+}
diff --git a/src/Qtx/Qtx.h b/src/Qtx/Qtx.h
index c0c810e6c..cb3a2062e 100755
--- a/src/Qtx/Qtx.h
+++ b/src/Qtx/Qtx.h
@@ -106,6 +106,9 @@ public:
 
   static void    rgbSet( const int, QColor& );
   static void    rgbSet( const int, int&, int&, int& );
+
+  static QColor  scaleColor( const int, const int, const int );
+  static void    scaleColors( const int, QValueList<QColor>& );
 };
 
 #endif
diff --git a/src/Qtx/QtxColorScale.cxx b/src/Qtx/QtxColorScale.cxx
index 469b7a9e5..528e399cd 100755
--- a/src/Qtx/QtxColorScale.cxx
+++ b/src/Qtx/QtxColorScale.cxx
@@ -1055,7 +1055,7 @@ QColor QtxColorScale::getColor( const int idx ) const
 	if ( colorMode() == User )
 		res = color( idx );
 	else
-		res = QColor( hueFromValue( idx, 0, intervalsNumber() - 1 ), 255, 255, QColor::Hsv );
+    res = Qtx::scaleColor( idx, 0, intervalsNumber() - 1 );
 	return res;
 }
 
@@ -1121,31 +1121,6 @@ QSimpleRichText* QtxColorScale::simpleRichText( const int flags ) const
 	return srt;
 }
 
-//================================================================
-// Function : hueFromValue
-// Purpose  : 
-//================================================================
-
-int QtxColorScale::hueFromValue( const int value, const int min, const int max ) const
-{
-  static const int HUE[10] = {230, 210, 195, 180, 160, 80, 60, 50, 30, 0};
-
-	if ( min == max )
-    return HUE[0];
-
-  double aPosition = 9.0 * ( value - min ) / ( max - min );
-
-  if ( aPosition <= 0. )
-    return HUE[0];
-
-  if ( aPosition >= 9. )
-    return HUE[9];
-
-  int idx = (int)aPosition;
-
-  return HUE[idx] + int( ( aPosition - idx ) * ( HUE[idx + 1] - HUE[idx] ) );
-}
-
 #if QT_VER == 3
 
 /*********************************************************************
diff --git a/src/Qtx/QtxColorScale.h b/src/Qtx/QtxColorScale.h
index cc49d83a7..21f838dbc 100755
--- a/src/Qtx/QtxColorScale.h
+++ b/src/Qtx/QtxColorScale.h
@@ -133,7 +133,6 @@ private:
 									                   const bool, const bool, const bool ) const;
 	  QSize                 calculateSize( const bool, const int,
 										                     const bool, const bool, const bool ) const;
-	  int                   hueFromValue( const int, const int, const int ) const;
 
 	  friend class Dock;
 
-- 
2.39.2