Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 648 insertions, 0 deletions

diff --git a/ksysguard/gui/SensorDisplayLib/SignalPlotter.cc b/ksysguard/gui/SensorDisplayLib/SignalPlotter.cc
new file mode 100644
index 000000000..f8ad121f1
--- /dev/null
+++ b/ksysguard/gui/SensorDisplayLib/SignalPlotter.cc
@@ -0,0 +1,648 @@
+/*
+    KSysGuard, the KDE System Guard
+
+    Copyright (c) 1999 - 2002 Chris Schlaeger <cs@kde.org>
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of version 2 of the GNU General Public
+    License as published by the Free Software Foundation
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+    KSysGuard is currently maintained by Chris Schlaeger <cs@kde.org>.
+    Please do not commit any changes without consulting me first. Thanks!
+
+*/
+
+#include <math.h>
+#include <string.h>
+
+#include <qpainter.h>
+#include <qpixmap.h>
+
+#include <kdebug.h>
+#include <kglobal.h>
+
+#include <ksgrd/StyleEngine.h>
+
+#include "SignalPlotter.h"
+
+SignalPlotter::SignalPlotter( QWidget *parent, const char *name )
+  : QWidget( parent, name )
+{
+  // Auto deletion does not work for pointer to arrays.
+  mBeamData.setAutoDelete( false );
+
+  setBackgroundMode( NoBackground );
+  mShowThinFrame = true;
+  mSamples = 0;
+  mMinValue = mMaxValue = 0.0;
+  mUseAutoRange = true;
+
+  mGraphStyle = GRAPH_POLYGON;
+
+  // Anything smaller than this does not make sense.
+  setMinimumSize( 16, 16 );
+  setSizePolicy( QSizePolicy( QSizePolicy::Expanding,
+                 QSizePolicy::Expanding, false ) );
+
+  mShowVerticalLines = true;
+  mVerticalLinesColor = KSGRD::Style->firstForegroundColor();
+  mVerticalLinesDistance = 30;
+  mVerticalLinesScroll = true;
+  mVerticalLinesOffset = 0;
+  mHorizontalScale = 1;
+
+  mShowHorizontalLines = true;
+  mHorizontalLinesColor = KSGRD::Style->secondForegroundColor();
+  mHorizontalLinesCount = 5;
+
+  mShowLabels = true;
+  mShowTopBar = false;
+  mFontSize = KSGRD::Style->fontSize();
+
+  mBackgroundColor = KSGRD::Style->backgroundColor();
+}
+
+SignalPlotter::~SignalPlotter()
+{
+  for ( double* p = mBeamData.first(); p; p = mBeamData.next() )
+    delete [] p;
+}
+
+bool SignalPlotter::addBeam( const QColor &color )
+{
+  double* d = new double[ mSamples ];
+  memset( d, 0, sizeof(double) * mSamples );
+  mBeamData.append( d );
+  mBeamColor.append( color );
+
+  return true;
+}
+
+void SignalPlotter::addSample( const QValueList<double>& sampleBuf )
+{
+  if ( mBeamData.count() != sampleBuf.count() )
+    return;
+
+  double* d;
+  if ( mUseAutoRange ) {
+    double sum = 0;
+    for ( d = mBeamData.first(); d; d = mBeamData.next() ) {
+      sum += d[ 0 ];
+      if ( sum < mMinValue )
+        mMinValue = sum;
+      if ( sum > mMaxValue )
+        mMaxValue = sum;
+    }
+  }
+
+  /* If the vertical lines are scrolling, increment the offset
+   * so they move with the data. The vOffset / hScale confusion
+   * is because v refers to Vertical Lines, and h to the horizontal
+   * distance between the vertical lines. */
+  if ( mVerticalLinesScroll ) {
+    mVerticalLinesOffset = ( mVerticalLinesOffset + mHorizontalScale)
+                           % mVerticalLinesDistance;
+  }
+
+  // Shift data buffers one sample down and insert new samples.
+  QValueList<double>::ConstIterator s;
+  for ( d = mBeamData.first(), s = sampleBuf.begin(); d; d = mBeamData.next(), ++s ) {
+    memmove( d, d + 1, ( mSamples - 1 ) * sizeof( double ) );
+    d[ mSamples - 1 ] = *s;
+  }
+
+  update();
+}
+
+void SignalPlotter::reorderBeams( const QValueList<int>& newOrder )
+{
+  if(newOrder.count() != mBeamData.count()) {
+    kdDebug() << "Serious problem in move sample" << endl;
+    return;
+  }
+  QPtrList<double> newBeamData;
+  QValueList<QColor> newBeamColor;
+
+  for(uint i = 0; i < newOrder.count(); i++) {
+    int newIndex = newOrder[i];
+    newBeamData.append(mBeamData.at(newIndex));
+    newBeamColor.append(*mBeamColor.at(newIndex));
+  }
+  mBeamData = newBeamData;
+  mBeamColor = newBeamColor;
+
+}
+
+void SignalPlotter::changeRange( int beam, double min, double max )
+{
+  // Only the first beam affects range calculation.
+  if ( beam > 1 )
+    return;
+
+  mMinValue = min;
+  mMaxValue = max;
+}
+
+QValueList<QColor> &SignalPlotter::beamColors()
+{
+  return mBeamColor;
+}
+
+void SignalPlotter::removeBeam( uint pos )
+{
+  mBeamColor.remove( mBeamColor.at( pos ) );
+  double *p = mBeamData.take( pos );
+  delete [] p;
+}
+
+void SignalPlotter::setTitle( const QString &title )
+{
+  mTitle = title;
+}
+
+QString SignalPlotter::title() const
+{
+  return mTitle;
+}
+
+void SignalPlotter::setUseAutoRange( bool value )
+{
+  mUseAutoRange = value;
+}
+
+bool SignalPlotter::useAutoRange() const
+{
+  return mUseAutoRange;
+}
+
+void SignalPlotter::setMinValue( double min )
+{
+  mMinValue = min;
+}
+
+double SignalPlotter::minValue() const
+{
+  return ( mUseAutoRange ? 0 : mMinValue );
+}
+
+void SignalPlotter::setMaxValue( double max )
+{
+  mMaxValue = max;
+}
+
+double SignalPlotter::maxValue() const
+{
+  return ( mUseAutoRange ? 0 : mMaxValue );
+}
+
+void SignalPlotter::setGraphStyle( uint style )
+{
+  mGraphStyle = style;
+}
+
+uint SignalPlotter::graphStyle() const
+{
+  return mGraphStyle;
+}
+
+void SignalPlotter::setHorizontalScale( uint scale )
+{
+  if (scale == mHorizontalScale)
+     return;
+
+  mHorizontalScale = scale;
+  if (isVisible())
+     updateDataBuffers();
+}
+
+int SignalPlotter::horizontalScale() const
+{
+  return mHorizontalScale;
+}
+
+void SignalPlotter::setShowVerticalLines( bool value )
+{
+  mShowVerticalLines = value;
+}
+
+bool SignalPlotter::showVerticalLines() const
+{
+  return mShowVerticalLines;
+}
+
+void SignalPlotter::setVerticalLinesColor( const QColor &color )
+{
+  mVerticalLinesColor = color;
+}
+
+QColor SignalPlotter::verticalLinesColor() const
+{
+  return mVerticalLinesColor;
+}
+
+void SignalPlotter::setVerticalLinesDistance( int distance )
+{
+  mVerticalLinesDistance = distance;
+}
+
+int SignalPlotter::verticalLinesDistance() const
+{
+  return mVerticalLinesDistance;
+}
+
+void SignalPlotter::setVerticalLinesScroll( bool value )
+{
+  mVerticalLinesScroll = value;
+}
+
+bool SignalPlotter::verticalLinesScroll() const
+{
+  return mVerticalLinesScroll;
+}
+
+void SignalPlotter::setShowHorizontalLines( bool value )
+{
+  mShowHorizontalLines = value;
+}
+
+bool SignalPlotter::showHorizontalLines() const
+{
+  return mShowHorizontalLines;
+}
+
+void SignalPlotter::setHorizontalLinesColor( const QColor &color )
+{
+  mHorizontalLinesColor = color;
+}
+
+QColor SignalPlotter::horizontalLinesColor() const
+{
+  return mHorizontalLinesColor;
+}
+
+void SignalPlotter::setHorizontalLinesCount( int count )
+{
+  mHorizontalLinesCount = count;
+}
+
+int SignalPlotter::horizontalLinesCount() const
+{
+  return mHorizontalLinesCount;
+}
+
+void SignalPlotter::setShowLabels( bool value )
+{
+  mShowLabels = value;
+}
+
+bool SignalPlotter::showLabels() const
+{
+  return mShowLabels;
+}
+
+void SignalPlotter::setShowTopBar( bool value )
+{
+  mShowTopBar = value;
+}
+
+bool SignalPlotter::showTopBar() const
+{
+  return mShowTopBar;
+}
+
+void SignalPlotter::setFontSize( int size )
+{
+  mFontSize = size;
+}
+
+int SignalPlotter::fontSize() const
+{
+  return mFontSize;
+}
+
+void SignalPlotter::setBackgroundColor( const QColor &color )
+{
+  mBackgroundColor = color;
+}
+
+QColor SignalPlotter::backgroundColor() const
+{
+  return mBackgroundColor;
+}
+
+void SignalPlotter::resizeEvent( QResizeEvent* )
+{
+  Q_ASSERT( width() > 2 );
+
+  updateDataBuffers();
+}
+
+void SignalPlotter::updateDataBuffers()
+{
+  /* Since the data buffers for the beams are equal in size to the
+   * width of the widget minus 2 we have to enlarge or shrink the
+   * buffers accordingly when a resize occures. To have a nicer
+   * display we try to keep as much data as possible. Data that is
+   * lost due to shrinking the buffers cannot be recovered on
+   * enlarging though. */
+
+  /* Determine new number of samples first.
+   *  +0.5 to ensure rounding up
+   *  +2 for extra data points so there is
+   *     1) no wasted space and
+   *     2) no loss of precision when drawing the first data point. */
+  uint newSampleNum = static_cast<uint>( ( ( width() - 2 ) /
+                                         mHorizontalScale ) + 2.5 );
+
+  // overlap between the old and the new buffers.
+  int overlap = kMin( mSamples, newSampleNum );
+
+  for ( uint i = 0; i < mBeamData.count(); ++i ) {
+    double* nd = new double[ newSampleNum ];
+
+    // initialize new part of the new buffer
+    if ( newSampleNum > (uint)overlap )
+      memset( nd, 0, sizeof( double ) * ( newSampleNum - overlap ) );
+
+    // copy overlap from old buffer to new buffer
+    memcpy( nd + ( newSampleNum - overlap ), mBeamData.at( i ) +
+            ( mSamples - overlap ), overlap * sizeof( double ) );
+
+    double *p = mBeamData.take( i );
+    delete [] p;
+    mBeamData.insert( i, nd );
+  }
+
+  mSamples = newSampleNum;
+}
+
+void SignalPlotter::paintEvent( QPaintEvent* )
+{
+  uint w = width();
+  uint h = height();
+
+  /* Do not do repaints when the widget is not yet setup properly. */
+  if ( w <= 2 )
+    return;
+
+  QPixmap pm( w, h );
+  QPainter p;
+  p.begin( &pm, this );
+
+  pm.fill( mBackgroundColor );
+  /* Draw white line along the bottom and the right side of the
+   * widget to create a 3D like look. */
+  p.setPen( QColor( colorGroup().light() ) );
+  if(mShowThinFrame) {
+    p.drawLine( 0, h - 1, w - 1, h - 1 );
+    p.drawLine( w - 1, 0, w - 1, h - 1 );
+
+    h--;
+    w--;
+    p.setClipRect( 0, 0, w, h );
+  }
+  double range = mMaxValue - mMinValue;
+
+  /* If the range is too small we will force it to 1.0 since it
+   * looks a lot nicer. */
+  if ( range < 0.000001 )
+    range = 1.0;
+
+  double minValue = mMinValue;
+  if ( mUseAutoRange ) {
+    if ( mMinValue != 0.0 ) {
+      double dim = pow( 10, floor( log10( fabs( mMinValue ) ) ) ) / 2;
+      if ( mMinValue < 0.0 )
+        minValue = dim * floor( mMinValue / dim );
+      else
+        minValue = dim * ceil( mMinValue / dim );
+      range = mMaxValue - minValue;
+      if ( range < 0.000001 )
+        range = 1.0;
+    }
+    // Massage the range so that the grid shows some nice values.
+    double step = range / (mHorizontalLinesCount+1);
+    double dim = pow( 10, floor( log10( step ) ) ) / 2;
+    range = dim * ceil( step / dim ) * (mHorizontalLinesCount+1);
+  }
+  double maxValue = minValue + range;
+
+  int top = 0;
+  if ( mShowTopBar && h > ( mFontSize/*top bar size*/ + 2/*padding*/ +5/*smallest reasonable size for a graph*/ ) ) {
+    /* Draw horizontal bar with current sensor values at top of display. */
+    p.setPen( mHorizontalLinesColor );
+    int x0 = w / 2;
+    p.setFont( QFont( p.font().family(), mFontSize ) );
+    top = p.fontMetrics().height();
+    h -= top;
+    int h0 = top - 2; // h0 is our new top.  It's at least 5 pixels high
+    p.drawText(0, 0, x0, top - 2, Qt::AlignCenter, mTitle );
+
+    p.drawLine( x0 - 1, 1, x0 - 1, h0 );
+    p.drawLine( 0, top - 1, w - 2, top - 1 );
+
+    double bias = -minValue;
+    double scaleFac = ( w - x0 - 2 ) / range;
+    QValueList<QColor>::Iterator col;
+    col = mBeamColor.begin();
+    for ( double* d = mBeamData.first(); d; d = mBeamData.next(), ++col ) {
+      int start = x0 + (int)( bias * scaleFac );
+      int end = x0 + (int)( ( bias += d[ mSamples - 1 ] ) * scaleFac );
+      /* If the rect is wider than 2 pixels we draw only the last
+       * pixels with the bright color. The rest is painted with
+       * a 50% darker color. */
+      if ( end - start > 1 ) {
+        p.setPen( (*col).dark( 150 ) );
+        p.setBrush( (*col).dark( 150 ) );
+        p.drawRect( start, 1, end - start, h0 );
+        p.setPen( *col );
+        p.drawLine( end, 1, end, h0 );
+      } else if ( start - end > 1 ) {
+        p.setPen( (*col).dark( 150 ) );
+        p.setBrush( (*col).dark( 150 ) );
+        p.drawRect( end, 1, start - end, h0 );
+        p.setPen( *col );
+        p.drawLine( end, 1, end, h0 );
+      } else {
+        p.setPen( *col );
+        p.drawLine( start, 1, start, h0 );
+      }
+    }
+  }
+
+  /* Draw scope-like grid vertical lines */
+  if ( mShowVerticalLines && w > 60 ) {
+    p.setPen( mVerticalLinesColor );
+    for ( uint x = mVerticalLinesOffset; x < ( w - 2 ); x += mVerticalLinesDistance )
+      p.drawLine( w - x, top, w - x, h + top - 2 );
+  }
+
+  /* In autoRange mode we determine the range and plot the values in
+   * one go. This is more efficiently than running through the
+   * buffers twice but we do react on recently discarded samples as
+   * well as new samples one plot too late. So the range is not
+   * correct if the recently discarded samples are larger or smaller
+   * than the current extreme values. But we can probably live with
+   * this. */
+  if ( mUseAutoRange )
+    mMinValue = mMaxValue = 0.0;
+
+  /* Plot stacked values */
+  double scaleFac = ( h - 2 ) / range;
+  if ( mGraphStyle == GRAPH_ORIGINAL ) {
+    int xPos = 0;
+    for ( int i = 0; i < mSamples; i++, xPos += mHorizontalScale ) {
+      double bias = -minValue;
+      QValueList<QColor>::Iterator col;
+      col = mBeamColor.begin();
+      double sum = 0.0;
+      for ( double* d = mBeamData.first(); d; d = mBeamData.next(), ++col ) {
+        if ( mUseAutoRange ) {
+          sum += d[ i ];
+          if ( sum < mMinValue )
+            mMinValue = sum;
+          if ( sum > mMaxValue )
+            mMaxValue = sum;
+        }
+        int start = top + h - 2 - (int)( bias * scaleFac );
+        int end = top + h - 2 - (int)( ( bias + d[ i ] ) * scaleFac );
+        bias += d[ i ];
+        /* If the line is longer than 2 pixels we draw only the last
+         * 2 pixels with the bright color. The rest is painted with
+         * a 50% darker color. */
+        if ( end - start > 2 ) {
+          p.fillRect( xPos, start, mHorizontalScale, end - start - 1, (*col).dark( 150 ) );
+          p.fillRect( xPos, end - 1, mHorizontalScale, 2, *col );
+        } else if ( start - end > 2 ) {
+          p.fillRect( xPos, start, mHorizontalScale, end - start + 1, (*col).dark( 150 ) );
+          p.fillRect( xPos, end + 1, mHorizontalScale, 2, *col );
+        } else
+          p.fillRect( xPos, start, mHorizontalScale, end - start, *col );
+
+      }
+    }
+  } else if ( mGraphStyle == GRAPH_POLYGON ) {
+    int *prevVals = new int[ mBeamData.count() ];
+    int hack[ 4 ];
+    hack[ 0 ] = hack[ 1 ] = hack[ 2 ] = hack[ 3 ] = 0;
+    int x1 = w - ( ( mSamples + 1 ) * mHorizontalScale );
+
+    for ( int i = 0; i < mSamples; i++ ) {
+      QValueList<QColor>::Iterator col;
+      col = mBeamColor.begin();
+      double sum = 0.0;
+      int y = top + h - 2;
+      int oldY = top + h;
+      int oldPrevY = oldY;
+      int height = 0;
+      int j = 0;
+      int jMax = mBeamData.count() - 1;
+      x1 += mHorizontalScale;
+      int x2 = x1 + mHorizontalScale;
+
+      for ( double* d = mBeamData.first(); d; d = mBeamData.next(), ++col, j++ ) {
+        if ( mUseAutoRange ) {
+          sum += d[ i ];
+          if ( sum < mMinValue )
+            mMinValue = sum;
+          if ( sum > mMaxValue )
+            mMaxValue = sum;
+        }
+        height = (int)( ( d[ i ] - minValue ) * scaleFac );
+        y -= height;
+
+        /* If the line is longer than 2 pixels we draw only the last
+         * 2 pixels with the bright color. The rest is painted with
+         * a 50% darker color. */
+        QPen lastPen = QPen( p.pen() );
+        p.setPen( (*col).dark( 150 ) );
+        p.setBrush( (*col).dark( 150 ) );
+        QPointArray pa( 4 );
+        int prevY = ( i == 0 ) ? y : prevVals[ j ];
+        pa.putPoints( 0, 1, x1, prevY );
+        pa.putPoints( 1, 1, x2, y );
+        pa.putPoints( 2, 1, x2, oldY );
+        pa.putPoints( 3, 1, x1, oldPrevY );
+        p.drawPolygon( pa );
+        p.setPen( lastPen );
+        if ( jMax == 0 ) {
+          // draw as normal, no deferred drawing req'd.
+          p.setPen( *col );
+          p.drawLine( x1, prevY, x2, y );
+        } else if ( j == jMax ) {
+          // draw previous values and current values
+          p.drawLine( hack[ 0 ], hack[ 1 ], hack[ 2 ], hack[ 3 ] );
+          p.setPen( *col );
+          p.drawLine( x1, prevY, x2, y );
+        } else if ( j == 0 ) {
+          // save values only
+          hack[ 0 ] = x1;
+          hack[ 1 ] = prevY;
+          hack[ 2 ] = x2;
+          hack[ 3 ] = y;
+          p.setPen( *col );
+        } else {
+          p.drawLine( hack[ 0 ], hack[ 1 ], hack[ 2 ], hack[ 3 ] );
+          hack[ 0 ] = x1;
+          hack[ 1 ] = prevY;
+          hack[ 2 ] = x2;
+          hack[ 3 ] = y;
+          p.setPen( *col );
+        }
+
+        prevVals[ j ] = y;
+        oldY = y;
+        oldPrevY = prevY;
+      }
+    }
+
+    delete[] prevVals;
+  }
+
+  /* Draw horizontal lines and values. Lines are always drawn.
+   * Values are only draw when width is greater than 60 */
+  if ( mShowHorizontalLines ) {
+    p.setPen( mHorizontalLinesColor );
+    p.setFont( QFont( p.font().family(), mFontSize ) );
+    QString val;
+
+    /* top = 0 or  font.height    depending on whether there's a topbar or not
+     * h = graphing area.height   - i.e. the actual space we have to draw inside
+     *
+     * Note we are drawing from 0,0 as the top left corner.  So we have to add on top to get to the top of where we are drawing
+     * so top+h is the height of the widget
+     */ 
+    for ( uint y = 1; y <= mHorizontalLinesCount; y++ ) {
+
+      int y_coord =  top + (y * h) / (mHorizontalLinesCount+1);  //Make sure it's y*h first to avoid rounding bugs
+      p.drawLine( 0, y_coord, w - 2, y_coord );
+
+      if ( mShowLabels && h > ( mFontSize + 1 ) * ( mHorizontalLinesCount + 1 )
+           && w > 60 ) {
+        val = QString::number(maxValue - (y * range) / (mHorizontalLinesCount+1 ) );
+        p.drawText( 6, y_coord  - 1, val );  //draw the text one pixel raised above the line
+      }
+    }
+
+    //Draw the bottom most (minimum) number as well
+    if ( mShowLabels && h > ( mFontSize + 1 ) * ( mHorizontalLinesCount + 1 )
+         && w > 60 ) {
+      val = QString::number( minValue );
+      p.drawText( 6, top + h - 2, val );
+    }
+  }
+
+  p.end();
+  bitBlt( this, 0, 0, &pm );
+}
+
+#include "SignalPlotter.moc"