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 // Created on: 2015-02-03
 // Copyright (c) 2015 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _AIS_ColorScale_HeaderFile
 #define _AIS_ColorScale_HeaderFile
 
 #include <AIS_InteractiveObject.hxx>
 #include <Aspect_TypeOfColorScaleData.hxx>
 #include <Aspect_TypeOfColorScalePosition.hxx>
 #include <Aspect_SequenceOfColor.hxx>
 #include <Standard.hxx>
 #include <Standard_DefineHandle.hxx>
 #include <TCollection_ExtendedString.hxx>
 #include <TColStd_SequenceOfExtendedString.hxx>
 
 class AIS_ColorScale;
 DEFINE_STANDARD_HANDLE(AIS_ColorScale, AIS_InteractiveObject)
 //! Class for drawing a custom color scale.
 //!
 //! The color scale consists of rectangular color bar (composed of fixed
 //! number of color intervals), optional labels, and title.
 //! The labels can be positioned either at the boundaries of the intervals,
 //! or at the middle of each interval.
 //! Colors and labels can be either defined automatically or set by the user.
 //! Automatic labels are calculated from numerical limits of the scale,
 //! its type (logarithmic or plain), and formatted by specified format string.
 class AIS_ColorScale : public AIS_InteractiveObject
 {
   DEFINE_STANDARD_RTTIEXT(AIS_ColorScale, AIS_InteractiveObject)
 public:
 
   //! Calculate color according passed value; returns true if value is in range or false, if isn't
   Standard_EXPORT static Standard_Boolean FindColor (const Standard_Real theValue,
                                                      const Standard_Real theMin,
                                                      const Standard_Real theMax,
                                                      const Standard_Integer theColorsCount,
                                                      const Graphic3d_Vec3d& theColorHlsMin,
                                                      const Graphic3d_Vec3d& theColorHlsMax,
                                                      Quantity_Color& theColor);
 
   //! Calculate color according passed value; returns true if value is in range or false, if isn't
   static Standard_Boolean FindColor (const Standard_Real theValue,
                                      const Standard_Real theMin,
                                      const Standard_Real theMax,
                                      const Standard_Integer theColorsCount,
                                      Quantity_Color& theColor)
   {
     return FindColor (theValue, theMin, theMax, theColorsCount,
                       Graphic3d_Vec3d (230.0, 1.0, 1.0),
                       Graphic3d_Vec3d (0.0,   1.0, 1.0),
                       theColor);
   }
 
   //! Shift hue into valid range.
   //! Lightness and Saturation should be specified in valid range [0.0, 1.0],
   //! however Hue might be given out of Quantity_Color range to specify desired range for interpolation.
   static Standard_Real hueToValidRange (const Standard_Real theHue)
   {
     Standard_Real aHue = theHue;
     while (aHue <   0.0) { aHue += 360.0; }
     while (aHue > 360.0) { aHue -= 360.0; }
     return aHue;
   }
 
 public:
 
   //! Default constructor.
   Standard_EXPORT AIS_ColorScale();
 
   //! Calculate color according passed value; returns true if value is in range or false, if isn't
   Standard_EXPORT Standard_Boolean FindColor (const Standard_Real theValue, Quantity_Color& theColor) const;
 
   //! Returns minimal value of color scale, 0.0 by default.
   Standard_Real GetMin() const { return myMin; }
 
   //! Sets the minimal value of color scale.
   void SetMin (const Standard_Real theMin) { SetRange (theMin, GetMax()); }
 
   //! Returns maximal value of color scale, 1.0 by default.
   Standard_Real GetMax() const { return myMax; }
 
   //! Sets the maximal value of color scale.
   void SetMax (const Standard_Real theMax) { SetRange (GetMin(), theMax); }
 
   //! Returns minimal and maximal values of color scale, 0.0 to 1.0 by default.
   void GetRange (Standard_Real& theMin, Standard_Real& theMax) const
   {
     theMin = myMin;
     theMax = myMax;
   }
 
   //! Sets the minimal and maximal value of color scale.
   //! Note that values order will be ignored - the minimum and maximum values will be swapped if needed.
   //! ::SetReversed() should be called to swap displaying order.
   Standard_EXPORT void SetRange (const Standard_Real theMin, const Standard_Real theMax);
 
   //! Returns the hue angle corresponding to minimum value, 230 by default (blue).
   Standard_Real HueMin() const { return myColorHlsMin[0]; }
 
   //! Returns the hue angle corresponding to maximum value, 0 by default (red).
   Standard_Real HueMax() const { return myColorHlsMax[0]; }
 
   //! Returns the hue angle range corresponding to minimum and maximum values, 230 to 0 by default (blue to red).
   void HueRange (Standard_Real& theMinAngle,
                  Standard_Real& theMaxAngle) const
   {
     theMinAngle = myColorHlsMin[0];
     theMaxAngle = myColorHlsMax[0];
   }
 
   //! Sets hue angle range corresponding to minimum and maximum values.
   //! The valid angle range is [0, 360], see Quantity_Color and Quantity_TOC_HLS for more details.
   void SetHueRange (const Standard_Real theMinAngle,
                     const Standard_Real theMaxAngle)
   {
     myColorHlsMin[0] = theMinAngle;
     myColorHlsMax[0] = theMaxAngle;
   }
 
   //! Returns color range corresponding to minimum and maximum values, blue to red by default.
   void ColorRange (Quantity_Color& theMinColor,
                    Quantity_Color& theMaxColor) const
   {
     theMinColor.SetValues (hueToValidRange (myColorHlsMin[0]), myColorHlsMin[1], myColorHlsMin[2], Quantity_TOC_HLS);
     theMaxColor.SetValues (hueToValidRange (myColorHlsMax[0]), myColorHlsMax[1], myColorHlsMax[2], Quantity_TOC_HLS);
   }
 
   //! Sets color range corresponding to minimum and maximum values.
   void SetColorRange (const Quantity_Color& theMinColor,
                       const Quantity_Color& theMaxColor)
   {
     theMinColor.Values (myColorHlsMin[0], myColorHlsMin[1], myColorHlsMin[2], Quantity_TOC_HLS);
     theMaxColor.Values (myColorHlsMax[0], myColorHlsMax[1], myColorHlsMax[2], Quantity_TOC_HLS);
   }
 
   //! Returns the type of labels, Aspect_TOCSD_AUTO by default.
   //! Aspect_TOCSD_AUTO - labels as boundary values for intervals
   //! Aspect_TOCSD_USER - user specified label is used
   Aspect_TypeOfColorScaleData GetLabelType() const { return myLabelType; }
 
   //! Sets the type of labels.
   //! Aspect_TOCSD_AUTO - labels as boundary values for intervals
   //! Aspect_TOCSD_USER - user specified label is used
   void SetLabelType (const Aspect_TypeOfColorScaleData theType) { myLabelType = theType; }
 
   //! Returns the type of colors, Aspect_TOCSD_AUTO by default.
   //! Aspect_TOCSD_AUTO - value between Red and Blue
   //! Aspect_TOCSD_USER - user specified color from color map
   Aspect_TypeOfColorScaleData GetColorType() const { return myColorType; }
 
   //! Sets the type of colors.
   //! Aspect_TOCSD_AUTO - value between Red and Blue
   //! Aspect_TOCSD_USER - user specified color from color map
   void SetColorType (const Aspect_TypeOfColorScaleData theType) { myColorType = theType; }
 
   //! Returns the number of color scale intervals, 10 by default.
   Standard_Integer GetNumberOfIntervals() const { return myNbIntervals; }
 
   //! Sets the number of color scale intervals.
   Standard_EXPORT void SetNumberOfIntervals (const Standard_Integer theNum);
 
   //! Returns the color scale title string, empty string by default.
   const TCollection_ExtendedString& GetTitle() const { return myTitle; }
 
   //! Sets the color scale title string.
   void SetTitle (const TCollection_ExtendedString& theTitle) { myTitle = theTitle; }
 
   //! Returns the format for numbers, "%.4g" by default.
   //! The same like format for function printf().
   //! Used if GetLabelType() is TOCSD_AUTO;
   const TCollection_AsciiString& GetFormat() const { return myFormat; }
 
   //! Returns the format of text.
   const TCollection_AsciiString& Format() const { return myFormat; }
 
   //! Sets the color scale auto label format specification.
   void SetFormat (const TCollection_AsciiString& theFormat) { myFormat = theFormat; }
 
   //! Returns the user specified label with index theIndex.
   //! Index is in range from 1 to GetNumberOfIntervals() or to
   //! GetNumberOfIntervals() + 1 if IsLabelAtBorder() is true.
   //! Returns empty string if label not defined.
   Standard_EXPORT TCollection_ExtendedString GetLabel (const Standard_Integer theIndex) const;
 
   //! Returns the user specified color from color map with index (starts at 1).
   //! Returns default color if index is out of range in color map.
   Standard_EXPORT Quantity_Color GetIntervalColor (const Standard_Integer theIndex) const;
 
   //! Sets the color of the specified interval. 
   //! Note that list is automatically resized to include specified index.
   //! @param theColor color value to set
   //! @param theIndex index in range [1, GetNumberOfIntervals()];
   //!                 appended to the end of list if -1 is specified
   Standard_EXPORT void SetIntervalColor (const Quantity_Color& theColor, const Standard_Integer theIndex);
 
   //! Returns the user specified labels.
   Standard_EXPORT void GetLabels (TColStd_SequenceOfExtendedString& theLabels) const;
 
   //! Returns the user specified labels.
   const TColStd_SequenceOfExtendedString& Labels() const { return myLabels; }
 
   //! Sets the color scale labels.
   //! The length of the sequence should be equal to GetNumberOfIntervals() or to GetNumberOfIntervals() + 1 if IsLabelAtBorder() is true.
   //! If length of the sequence does not much the number of intervals,
   //! then these labels will be considered as "free" and will be located
   //! at the virtual intervals corresponding to the number of labels
   //! (with flag IsLabelAtBorder() having the same effect as in normal case).
   Standard_EXPORT void SetLabels (const TColStd_SequenceOfExtendedString& theSeq);
 
   //! Returns the user specified colors.
   Standard_EXPORT void GetColors (Aspect_SequenceOfColor& theColors) const;
 
   //! Returns the user specified colors.
   const Aspect_SequenceOfColor& GetColors() const { return myColors; }
 
   //! Sets the color scale colors.
   //! The length of the sequence should be equal to GetNumberOfIntervals().
   Standard_EXPORT void SetColors (const Aspect_SequenceOfColor& theSeq);
 
   //! Populates colors scale by colors of the same lightness value in CIE Lch
   //! color space, distributed by hue, with perceptually uniform differences
   //! between consequent colors.
   //! See MakeUniformColors() for description of parameters.
   void SetUniformColors (Standard_Real theLightness, 
                          Standard_Real theHueFrom, Standard_Real theHueTo)
   {
     SetColors (MakeUniformColors (myNbIntervals, theLightness, theHueFrom, theHueTo));
     SetColorType (Aspect_TOCSD_USER);
   }
 
   //! Generates sequence of colors of the same lightness value in CIE Lch
   //! color space (see #Quantity_TOC_CIELch), with hue values in the specified range.
   //! The colors are distributed across the range such as to have perceptually
   //! same difference between neighbour colors.
   //! For each color, maximal chroma value fitting in sRGB gamut is used.
   //!
   //! @param theNbColors - number of colors to generate
   //! @param theLightness - lightness to be used (0 is black, 100 is white, 32 is
   //!        lightness of pure blue)
   //! @param theHueFrom - hue value at the start of the scale
   //! @param theHueTo - hue value defining the end of the scale
   //! 
   //! Hue value can be out of the range [0, 360], interpreted as modulo 360.
   //! The colors of the scale will be in the order of increasing hue if
   //! theHueTo > theHueFrom, and decreasing otherwise.
   Standard_EXPORT static Aspect_SequenceOfColor
     MakeUniformColors (Standard_Integer theNbColors, Standard_Real theLightness,
                        Standard_Real theHueFrom, Standard_Real theHueTo);
 
   //! Returns the position of labels concerning color filled rectangles, Aspect_TOCSP_RIGHT by default.
   Aspect_TypeOfColorScalePosition GetLabelPosition() const { return myLabelPos; }
 
   //! Sets the color scale labels position relative to color bar.
   void SetLabelPosition (const Aspect_TypeOfColorScalePosition thePos) { myLabelPos = thePos; }
 
   //! Returns the position of color scale title, Aspect_TOCSP_LEFT by default.
   Aspect_TypeOfColorScalePosition GetTitlePosition() const { return myTitlePos; }
 
   //! Sets the color scale title position.
   Standard_DEPRECATED("AIS_ColorScale::SetTitlePosition() has no effect!")
   void SetTitlePosition (const Aspect_TypeOfColorScalePosition thePos) { myTitlePos = thePos; }
 
   //! Returns TRUE if the labels and colors used in reversed order, FALSE by default.
   //!  - Normal,   bottom-up order with Minimal value on the Bottom and Maximum value on Top.
   //!  - Reversed, top-down  order with Maximum value on the Bottom and Minimum value on Top.
   Standard_Boolean IsReversed() const { return myIsReversed; }
 
   //! Sets true if the labels and colors used in reversed order.
   void SetReversed (const Standard_Boolean theReverse) { myIsReversed = theReverse; }
 
   //! Return TRUE if color transition between neighbor intervals
   //! should be linearly interpolated, FALSE by default.
   Standard_Boolean IsSmoothTransition() const { return myIsSmooth; }
 
   //! Setup smooth color transition.
   void SetSmoothTransition (const Standard_Boolean theIsSmooth) { myIsSmooth = theIsSmooth; }
 
   //! Returns TRUE if the labels are placed at border of color intervals, TRUE by default.
   //! The automatically generated label will show value exactly on the current position:
   //!  - value connecting two neighbor intervals (TRUE)
   //!  - value in the middle of interval (FALSE)
   Standard_Boolean IsLabelAtBorder() const { return myIsLabelAtBorder; }
 
   //! Sets true if the labels are placed at border of color intervals (TRUE by default).
   //! If set to False, labels will be drawn at color intervals rather than at borders.
   void SetLabelAtBorder (const Standard_Boolean theOn) { myIsLabelAtBorder = theOn; }
 
   //! Returns TRUE if the color scale has logarithmic intervals, FALSE by default.
   Standard_Boolean IsLogarithmic() const { return myIsLogarithmic; }
 
   //! Sets true if the color scale has logarithmic intervals.
   void SetLogarithmic (const Standard_Boolean isLogarithmic) { myIsLogarithmic = isLogarithmic; }
 
   //! Sets the color scale label at index.
   //! Note that list is automatically resized to include specified index.
   //! @param theLabel new label text
   //! @param theIndex index in range [1, GetNumberOfIntervals()] or [1, GetNumberOfIntervals() + 1] if IsLabelAtBorder() is true;
   //!                 label is appended to the end of list if negative index is specified
   Standard_EXPORT void SetLabel (const TCollection_ExtendedString& theLabel, const Standard_Integer theIndex);
 
   //! Returns the size of color bar, 0 and 0 by default
   //! (e.g. should be set by user explicitly before displaying).
   void GetSize (Standard_Integer& theBreadth, Standard_Integer& theHeight) const
   {
     theBreadth = myBreadth;
     theHeight  = myHeight;
   }
 
   //! Sets the size of color bar.
   void SetSize (const Standard_Integer theBreadth, const Standard_Integer theHeight)
   {
     myBreadth = theBreadth;
     myHeight  = theHeight;
   }
 
   //! Returns the breadth of color bar, 0 by default
   //! (e.g. should be set by user explicitly before displaying).
   Standard_Integer GetBreadth() const { return myBreadth; }
 
   //! Sets the width of color bar.
   void SetBreadth (const Standard_Integer theBreadth) { myBreadth = theBreadth; }
 
   //! Returns the height of color bar, 0 by default
   //! (e.g. should be set by user explicitly before displaying).
   Standard_Integer GetHeight() const { return myHeight; }
 
   //! Sets the height of color bar.
   void SetHeight (const Standard_Integer theHeight) { myHeight  = theHeight; }
 
   //! Returns the bottom-left position of color scale, 0x0 by default.
   void GetPosition (Standard_Real& theX, Standard_Real& theY) const
   {
     theX = myXPos;
     theY = myYPos;
   }
 
   //! Sets the position of color scale.
   void SetPosition (const Standard_Integer theX, const Standard_Integer theY)
   {
     myXPos = theX;
     myYPos = theY;
   }
 
   //! Returns the left position of color scale, 0 by default.
   Standard_Integer GetXPosition() const { return myXPos; }
 
   //! Sets the left position of color scale.
   void SetXPosition (const Standard_Integer theX) { myXPos = theX; }
 
   //! Returns the bottom position of color scale, 0 by default.
   Standard_Integer GetYPosition() const { return myYPos; }
 
   //! Sets the bottom position of color scale.
   void SetYPosition (const Standard_Integer theY) { myYPos = theY; }
 
   //! Returns the font height of text labels, 20 by default.
   Standard_Integer GetTextHeight() const { return myTextHeight; }
 
   //! Sets the height of text of color scale.
   void SetTextHeight (const Standard_Integer theHeight) { myTextHeight = theHeight; }
 
 public:
 
   //! Returns the width of text.
   //! @param theText [in] the text of which to calculate width.
   Standard_EXPORT Standard_Integer TextWidth (const TCollection_ExtendedString& theText) const;
 
   //! Returns the height of text.
   //! @param theText [in] the text of which to calculate height.
   Standard_EXPORT Standard_Integer TextHeight (const TCollection_ExtendedString& theText) const;
 
   Standard_EXPORT void TextSize (const TCollection_ExtendedString& theText,
                                  const Standard_Integer theHeight,
                                  Standard_Integer& theWidth,
                                  Standard_Integer& theAscent,
                                  Standard_Integer& theDescent) const;
 
 public:
 
   //! Return true if specified display mode is supported.
   virtual Standard_Boolean AcceptDisplayMode (const Standard_Integer theMode) const Standard_OVERRIDE { return theMode == 0; }
 
   //! Compute presentation.
   Standard_EXPORT virtual void Compute (const Handle(PrsMgr_PresentationManager)& thePrsMgr,
                                         const Handle(Prs3d_Presentation)& thePresentation,
                                         const Standard_Integer theMode) Standard_OVERRIDE;
 
   //! Compute selection - not implemented for color scale.
   virtual void ComputeSelection (const Handle(SelectMgr_Selection)& /*aSelection*/,
                                  const Standard_Integer /*aMode*/) Standard_OVERRIDE {}
 
 private:
 
   //! Returns the size of color scale.
   //! @param theWidth [out] the width of color scale.
   //! @param theHeight [out] the height of color scale.
   void SizeHint (Standard_Integer& theWidth, Standard_Integer& theHeight) const;
 
   //! Returns the upper value of given interval, or minimum for theIndex = 0.
   Standard_Real GetIntervalValue (const Standard_Integer theIndex) const;
 
   //! Returns the color for the given value in the given interval.
   //! @param theValue [in] the current value of interval
   //! @param theMin   [in] the min value of interval
   //! @param theMax   [in] the max value of interval
   Quantity_Color colorFromValue (const Standard_Real theValue,
                                  const Standard_Real theMin,
                                  const Standard_Real theMax) const;
 
   //! Initialize text aspect for drawing the labels.
   void updateTextAspect();
 
   //! Simple alias for Prs3d_Text::Draw().
   //! @param theGroup [in] presentation group
   //! @param theText  [in] text to draw
   //! @param theX     [in] X coordinate of text position
   //! @param theY     [in] Y coordinate of text position
   //! @param theVertAlignment [in] text vertical alignment
   void drawText (const Handle(Graphic3d_Group)& theGroup,
                  const TCollection_ExtendedString& theText,
                  const Standard_Integer theX, const Standard_Integer theY,
                  const Graphic3d_VerticalTextAlignment theVertAlignment);
 
   //! Determine the maximum text label width in pixels.
   Standard_Integer computeMaxLabelWidth (const TColStd_SequenceOfExtendedString& theLabels) const;
 
   //! Draw labels.
   void drawLabels (const Handle(Graphic3d_Group)& theGroup,
                    const TColStd_SequenceOfExtendedString& theLabels,
                    const Standard_Integer theBarBottom,
                    const Standard_Integer theBarHeight,
                    const Standard_Integer theMaxLabelWidth,
                    const Standard_Integer theColorBreadth);
 
   //! Draw a color bar.
   void drawColorBar (const Handle(Prs3d_Presentation)& thePrs,
                      const Standard_Integer theBarBottom,
                      const Standard_Integer theBarHeight,
                      const Standard_Integer theMaxLabelWidth,
                      const Standard_Integer theColorBreadth);
 
   //! Draw a frame.
   //! @param theX [in] the X coordinate of frame position.
   //! @param theY [in] the Y coordinate of frame position.
   //! @param theWidth [in] the width of frame.
   //! @param theHeight [in] the height of frame.
   //! @param theColor [in] the color of frame.
   void drawFrame (const Handle(Prs3d_Presentation)& thePrs,
                   const Standard_Integer theX, const Standard_Integer theY,
                   const Standard_Integer theWidth, const Standard_Integer theHeight,
                   const Quantity_Color& theColor);
 
 private:
 
   Standard_Real                    myMin;             //!< values range - minimal value
   Standard_Real                    myMax;             //!< values range - maximal value
   Graphic3d_Vec3d                  myColorHlsMin;     //!< HLS color corresponding to minimum value
   Graphic3d_Vec3d                  myColorHlsMax;     //!< HLS color corresponding to maximum value
   TCollection_ExtendedString       myTitle;           //!< optional title string     
   TCollection_AsciiString          myFormat;          //!< sprintf() format for generating label from value
   Standard_Integer                 myNbIntervals;     //!< number of intervals
   Aspect_TypeOfColorScaleData      myColorType;       //!< color type
   Aspect_TypeOfColorScaleData      myLabelType;       //!< label type
   Standard_Boolean                 myIsLabelAtBorder; //!< at border
   Standard_Boolean                 myIsReversed;      //!< flag indicating reversed order
   Standard_Boolean                 myIsLogarithmic;   //!< flag indicating logarithmic scale
   Standard_Boolean                 myIsSmooth;        //!< flag indicating smooth transition between the colors
   Aspect_SequenceOfColor           myColors;          //!< sequence of custom colors
   TColStd_SequenceOfExtendedString myLabels;          //!< sequence of custom text labels
   Aspect_TypeOfColorScalePosition  myLabelPos;        //!< label position relative to the color scale
   Aspect_TypeOfColorScalePosition  myTitlePos;        //!< title position
   Standard_Integer                 myXPos;            //!< left   position
   Standard_Integer                 myYPos;            //!< bottom position
   Standard_Integer                 myBreadth;         //!< color scale breadth
   Standard_Integer                 myHeight;          //!< height of the color scale
   Standard_Integer                 mySpacing;         //!< extra spacing between element
   Standard_Integer                 myTextHeight;      //!< label font height
 
 };
 
 #endif

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