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map.cpp

//Author:    Max Howell <max.howell@methylblue.com>, (C) 2003-4
//Copyright: See COPYING file that comes with this distribution

#include <kcursor.h>         //make()
#include <kglobalsettings.h> //kdeColours
#include <kimageeffect.h>    //desaturate()
#include <qapplication.h>    //make()
#include <qimage.h>          //make() & paint()
#include <qfont.h>           //ctor
#include <qfontmetrics.h>    //ctor
#include <qpainter.h>

#include "builder.h"
#include "Config.h"
#include "debug.h"
#include "fileTree.h"
#define SINCOS_H_IMPLEMENTATION (1)
#include "sincos.h"
#include "widget.h"

#define COLOR_GREY QColor( 0, 0, 140, QColor::Hsv )


RadialMap::Map::Map()
        : m_signature( 0 )
        , m_ringBreadth( MIN_RING_BREADTH )
        , m_innerRadius( 0 )
        , m_visibleDepth( DEFAULT_RING_DEPTH )
{
    //FIXME this is all broken. No longer is a maximum depth!
    const int fmh   = QFontMetrics( QFont() ).height();
    const int fmhD4 = fmh / 4;
    MAP_2MARGIN = 2 * ( fmh - (fmhD4 - LABEL_MAP_SPACER) ); //margin is dependent on fitting in labels at top and bottom
}

RadialMap::Map::~Map()
{
   delete [] m_signature;
}

void
RadialMap::Map::invalidate( const bool desaturateTheImage )
{
   DEBUG_ANNOUNCE

   delete [] m_signature;
   m_signature = 0;

   if( desaturateTheImage )
   {
      QImage img = this->convertToImage();

      KImageEffect::desaturate( img, 0.7 );
      KImageEffect::toGray( img, true );

      this->convertFromImage( img );
   }

   m_visibleDepth = Config::defaultRingDepth;
}

void
RadialMap::Map::make( const Directory *tree, bool refresh )
{
   DEBUG_ANNOUNCE

   //**** determineText seems pointless optimisation
   //   but is it good to keep the text consistent?
   //   even if it makes it a lie?

   //slow operation so set the wait cursor
   QApplication::setOverrideCursor( KCursor::waitCursor() );

   {
      //build a signature of visible components
      delete [] m_signature;
      Builder builder( this, tree, refresh );
   }

   //colour the segments
   colorise();

   //determine centerText
   if( !refresh )
   {
      int i;
      for( i = 2; i > 0; --i )
         if( tree->size() > File::DENOMINATOR[i] )
            break;

      m_centerText = tree->humanReadableSize( (File::UnitPrefix)i );
   }

   //paint the pixmap
   aaPaint();

   QApplication::restoreOverrideCursor();
}

void
RadialMap::Map::setRingBreadth()
{
   DEBUG_ANNOUNCE

   //FIXME called too many times on creation

   m_ringBreadth = (height() - MAP_2MARGIN) / (2 * m_visibleDepth + 4);

   if( m_ringBreadth < MIN_RING_BREADTH )
      m_ringBreadth = MIN_RING_BREADTH;

   else if( m_ringBreadth > MAX_RING_BREADTH )
      m_ringBreadth = MAX_RING_BREADTH;
}

bool
RadialMap::Map::resize( const QRect &rect )
{
   DEBUG_ANNOUNCE

   //there's a MAP_2MARGIN border

   #define mw width()
   #define mh height()
   #define cw rect.width()
   #define ch rect.height()

   if( cw < mw || ch < mh || (cw > mw && ch > mh) )
   {
      uint size = (( cw < ch ) ? cw : ch) - MAP_2MARGIN;

      //this also causes uneven sizes to always resize when resizing but map is small in that dimension
      //size -= size % 2; //even sizes mean less staggered non-antialiased resizing

      {
         const uint minSize = MIN_RING_BREADTH * 2 * (m_visibleDepth + 2);
         const uint mD2 = MAP_2MARGIN / 2;

         if( size < minSize ) size = minSize;

         //this QRect is used by paint()
         m_rect.setRect( mD2, mD2, size, size );
      }

      //resize the pixmap
      size += MAP_2MARGIN;
      KPixmap::resize( size, size );

      // for summary widget this is a good optimisation as it happens
      if (KPixmap::isNull())
          return false;

      if( m_signature != 0 )
      {
         setRingBreadth();
         paint();
      }
      else fill(); //FIXME I don't like having to do this..

      return true;
   }

   #undef mw
   #undef mh
   #undef cw
   #undef ch

   return false;
}

void
RadialMap::Map::colorise()
{
   DEBUG_ANNOUNCE

   QColor cp, cb;
   double darkness = 1;
   double contrast = (double)Config::contrast / (double)100;
   int h, s1, s2, v1, v2;

   QColor kdeColour[2] = { KGlobalSettings::inactiveTitleColor(), KGlobalSettings::activeTitleColor() };

   double deltaRed   = (double)(kdeColour[0].red()   - kdeColour[1].red())   / 2880; //2880 for semicircle
   double deltaGreen = (double)(kdeColour[0].green() - kdeColour[1].green()) / 2880;
   double deltaBlue  = (double)(kdeColour[0].blue()  - kdeColour[1].blue())  / 2880;

   for( uint i = 0; i <= m_visibleDepth; ++i, darkness += 0.04 )
   {
      for( Iterator<Segment> it = m_signature[i].iterator(); it != m_signature[i].end(); ++it )
      {
            switch( Config::scheme )
            {
            case 2000: //HACK for summary view

               if( (*it)->file()->name() == "Used" ) {
                  cb = QApplication::palette().active().color( QColorGroup::Highlight );
                  cb.getHsv( &h, &s1, &v1 );

                  if( s1 > 80 )
                     s1 = 80;

                  v2 = v1 - int(contrast * v1);
                  s2 = s1 + int(contrast * (255 - s1));

                  cb.setHsv( h, s1, v1 );
                  cp.setHsv( h, s2, v2 );
               }
               else {
                  cp = Qt::gray;
                  cb = Qt::white;
               }

               (*it)->setPalette( cp, cb );

               continue;

            case Filelight::KDE:
            {
               //gradient will work by figuring out rgb delta values for 360 degrees
               //then each component is angle*delta

               int a = (*it)->start();

               if( a > 2880 ) a = 2880 - (a - 2880);

               h  = (int)(deltaRed   * a) + kdeColour[1].red();
               s1 = (int)(deltaGreen * a) + kdeColour[1].green();
               v1 = (int)(deltaBlue  * a) + kdeColour[1].blue();

               cb.setRgb( h, s1, v1 );
               cb.getHsv( &h, &s1, &v1 );

               break;
            }

            case Filelight::HighContrast:

               cp.setHsv( 0, 0, 0 ); //values of h, s and v are irrelevant
               cb.setHsv( 180, 0, int(255.0 * contrast) );
               (*it)->setPalette( cp, cb );
               continue;

            default:
               h  = int((*it)->start() / 16);
               s1 = 160;
               v1 = (int)(255.0 / darkness); //****doing this more often than once seems daft!
            }

            v2 = v1 - int(contrast * v1);
            s2 = s1 + int(contrast * (255 - s1));

            if( s1 < 80 ) s1 = 80; //can fall too low and makes contrast between the files hard to discern

            if( (*it)->isFake() ) //multi-file
            {
               cb.setHsv( h, s2, (v2 < 90) ? 90 : v2 ); //too dark if < 100
               cp.setHsv( h, 17, v1 );
            }
            else if( !(*it)->file()->isDirectory() ) //file
            {
               cb.setHsv( h, 17, v1 );
               cp.setHsv( h, 17, v2 );
            }
            else //directory
            {
               cb.setHsv( h, s1, v1 ); //v was 225
               cp.setHsv( h, s2, v2 ); //v was 225 - delta
            }

            (*it)->setPalette( cp, cb );

            //**** may be better to store KDE colours as H and S and vary V as others
            //**** perhaps make saturation difference for s2 dependent on contrast too
            //**** fake segments don't work with highContrast
            //**** may work better with cp = cb rather than Qt::white
            //**** you have to ensure the grey of files is sufficient, currently it works only with rainbow (perhaps use contrast there too)
            //**** change v1,v2 to vp, vb etc.
            //**** using percentages is not strictly correct as the eye doesn't work like that
            //**** darkness factor is not done for kde_colour scheme, and also value for files is incorrect really for files in this scheme as it is not set like rainbow one is
      }
   }
}

void
RadialMap::Map::aaPaint()
{
   //paint() is called during continuous processes
   //aaPaint() is not and is slower so set overidecursor (make sets it too)
   QApplication::setOverrideCursor( KCursor::waitCursor() );
   paint( Config::antiAliasFactor );
   QApplication::restoreOverrideCursor();
}

void
RadialMap::Map::paint( unsigned int scaleFactor )
{
   DEBUG_ANNOUNCE

   if (scaleFactor == 0) //just in case
      scaleFactor = 1;

   QPainter paint;
   QRect rect = m_rect;
   int step = m_ringBreadth;
   int excess = -1;

   //scale the pixmap, or do intelligent distribution of excess to prevent nasty resizing
   if( scaleFactor > 1 )
   {
      int x1, y1, x2, y2;
      rect.coords( &x1, &y1, &x2, &y2 );
      x1 *= scaleFactor;
      y1 *= scaleFactor;
      x2 *= scaleFactor;
      y2 *= scaleFactor;
      rect.setCoords( x1, y1, x2, y2 );

      step *= scaleFactor;
      KPixmap::resize( this->size() * (int)scaleFactor );
   }
   else if( m_ringBreadth != MAX_RING_BREADTH && m_ringBreadth != MIN_RING_BREADTH ) {
      excess = rect.width() % m_ringBreadth;
      ++step;
   }

   //**** best option you can think of is to make the circles slightly less perfect,
   //  ** i.e. slightly eliptic when resizing inbetween

   if (KPixmap::isNull())
      return;

   paint.begin( this );

   fill(); //erase background

   for( int x = m_visibleDepth; x >= 0; --x )
   {
      int width = rect.width() / 2;
      //clever geometric trick to find largest angle that will give biggest arrow head
      int a_max = int(acos( (double)width / double((width + 5) * scaleFactor) ) * (180*16 / M_PI));

      for( ConstIterator<Segment> it = m_signature[x].constIterator(); it != m_signature[x].end(); ++it )
      {
         //draw the pie segments, most of this code is concerned with drawing the little
         //arrows on the ends of segments when they have hidden files

         paint.setPen( (*it)->pen() );

         if( (*it)->hasHiddenChildren() )
         {
            //draw arrow head to indicate undisplayed files/directories
            QPointArray pts( 3 );
            QPoint pos, cpos = rect.center();
            int a[3] = { (*it)->start(), (*it)->length(), 0 };

            a[2] = a[0] + (a[1] / 2); //assign to halfway between
            if( a[1] > a_max )
            {
               a[1] = a_max;
               a[0] = a[2] - a_max / 2;
            }

            a[1] += a[0];

            for( int i = 0, radius = width; i < 3; ++i )
            {
               double ra = M_PI/(180*16) * a[i], sinra, cosra;

               if( i == 2 )
                  radius += 5 * scaleFactor;
               sincos( ra, &sinra, &cosra );
               pos.rx() = cpos.x() + static_cast<int>(cosra * radius);
               pos.ry() = cpos.y() - static_cast<int>(sinra * radius);
               pts.setPoint( i, pos );
            }

            paint.setBrush( (*it)->pen() );
            paint.drawPolygon( pts );
         }

         paint.setBrush( (*it)->brush() );
         paint.drawPie( rect, (*it)->start(), (*it)->length() );

         if( (*it)->hasHiddenChildren() )
         {
            //**** code is bloated!
            paint.save();
            QPen pen = paint.pen();
            int width = 2 * scaleFactor;
            pen.setWidth( width );
            paint.setPen( pen );
            QRect rect2 = rect;
            width /= 2;
            rect2.addCoords( width, width, -width, -width );
            paint.drawArc( rect2, (*it)->start(), (*it)->length() );
            paint.restore();
         }
      }

      if( excess >= 0 ) { //excess allows us to resize more smoothly (still crud tho)
         if( excess < 2 ) //only decrease rect by more if even number of excesses left
         --step;
         excess -= 2;
      }

      rect.addCoords( step, step, -step, -step );
   }

   //  if( excess > 0 ) rect.addCoords( excess, excess, 0, 0 ); //ugly

   paint.setPen( COLOR_GREY );
   paint.setBrush( Qt::white );
   paint.drawEllipse( rect );

   if( scaleFactor > 1 )
   {
      //have to end in order to smoothscale()
      paint.end();

      int x1, y1, x2, y2;
      rect.coords( &x1, &y1, &x2, &y2 );
      x1 /= scaleFactor;
      y1 /= scaleFactor;
      x2 /= scaleFactor;
      y2 /= scaleFactor;
      rect.setCoords( x1, y1, x2, y2 );

      QImage img = this->convertToImage();
      img = img.smoothScale( this->size() / (int)scaleFactor );
      this->convertFromImage( img );

      paint.begin( this );
      paint.setPen( COLOR_GREY );
      paint.setBrush( Qt::white );
   }

   paint.drawText( rect, Qt::AlignCenter, m_centerText );

   m_innerRadius = rect.width() / 2; //rect.width should be multiple of 2

   paint.end();
}

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