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tdeedu/libkdeedu/kdeeduplot/kplotwidget.cpp

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/***************************************************************************
kplotwidget.cpp - A widget for plotting in KStars
-------------------
begin : Sun 18 May 2003
copyright : (C) 2003 by Jason Harris
email : kstars@30doradus.org
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <math.h> //for log10(), pow(), modf()
#include <kdebug.h>
#include <qpainter.h>
#include <qpixmap.h>
#include "kplotwidget.h"
#include "kplotwidget.moc"
KPlotWidget::KPlotWidget( double x1, double x2, double y1, double y2, QWidget *parent, const char* name )
: QWidget( parent, name, WNoAutoErase ),
dXtick(0.0), dYtick(0.0),
nmajX(0), nminX(0), nmajY(0), nminY(0),
ShowTickMarks( true ), ShowTickLabels( true ), ShowGrid( false )
{
setBackgroundMode( QWidget::NoBackground );
//set DataRect
setLimits( x1, x2, y1, y2 );
setDefaultPadding();
//Set PixRect (starts at (0,0) because we will translate by leftPadding(), topPadding() )
PixRect = QRect( 0, 0, width() - leftPadding() - rightPadding(),
height() - topPadding() - bottomPadding() );
buffer = new QPixmap();
//default colors:
setBGColor( QColor( "black" ) );
setFGColor( QColor( "white" ) );
setGridColor( QColor( "grey" ) );
ObjectList.setAutoDelete( true );
}
KPlotWidget::~KPlotWidget()
{
delete (buffer);
}
void KPlotWidget::setLimits( double x1, double x2, double y1, double y2 ) {
double XA1, XA2, YA1, YA2;
if (x2<x1) { XA1=x2; XA2=x1; }
else { XA1=x1; XA2=x2; }
if ( y2<y1) { YA1=y2; YA2=y1; }
else { YA1=y1; YA2=y2; }
DataRect = DRect( XA1, YA1, XA2-XA1, YA2-YA1 );
updateTickmarks();
}
void KPlotWidget::updateTickmarks() {
// Determine the number and spacing of tickmarks for the current plot limits.
if ( dataWidth() == 0.0 ) {
kdWarning() << "X range invalid! " << x() << " to " << x2() << endl;
DataRect.setWidth( 1.0 );
return;
}
if ( dataHeight() == 0.0 ) {
kdWarning() << "Y range invalid! " << y() << " to " << y2() << endl;
DataRect.setHeight( 1.0 );
return;
}
int nmajor(0), nminor(0);
double z(0.0), z2(0.0);
double Range(0.0), s(0.0), t(0.0), pwr(0.0), dTick(0.0);
//loop over X and Y axes...the z variables substitute for either X or Y
for ( unsigned int iaxis=0; iaxis<2; ++iaxis ) {
if ( iaxis == 1 ) {
z = x(); z2 = x2();
} else {
z = y(); z2 = y2();
}
//determine size of region to be drawn, in draw units
Range = z2 - z;
//s is the power-of-ten factor of Range:
//Range = t * s; s = 10^(pwr). e.g., Range=350.0 then t=3.5, s = 100.0; pwr = 2.0
modf( log10(Range), &pwr );
s = pow( 10.0, pwr );
t = Range/s;
//adjust s and t such that t is between 3 and 5:
if ( t < 3.0 ) { t *= 10.0; s /= 10.0; } //t now btwn 3 and 30
if ( t < 6.0 ) { //accept current values
dTick = s;
nmajor = int(t);
nminor = 5;
} else if ( t < 10.0 ) { //factor of 2
dTick = s*2.0;
nmajor = int(t/2.0);
nminor = 4;
} else if ( t < 20.0 ) { //factor of 4
dTick = s*4.0;
nmajor = int(t/4.0);
nminor = 4;
} else { //factor of 5
dTick = s*5.0;
nmajor = int(t/5.0);
nminor = 5;
}
if ( iaxis==1 ) { //X axis
nmajX = nmajor;
nminX = nminor;
dXtick = dTick;
} else { //Y axis
nmajY = nmajor;
nminY = nminor;
dYtick = dTick;
}
} //end for iaxis
}
void KPlotWidget::resizeEvent( QResizeEvent* /* e */ ) {
int newWidth = width() - leftPadding() - rightPadding();
int newHeight = height() - topPadding() - bottomPadding();
PixRect = QRect( 0, 0, newWidth, newHeight );
buffer->resize( width(), height() );
}
void KPlotWidget::paintEvent( QPaintEvent* /* e */ ) {
QPainter p;
p.begin( buffer );
p.fillRect( 0, 0, width(), height(), bgColor() );
p.translate( leftPadding(), topPadding() );
drawObjects( &p );
drawBox( &p );
p.end();
bitBlt( this, 0, 0, buffer );
}
void KPlotWidget::drawObjects( QPainter *p ) {
for ( KPlotObject *po = ObjectList.first(); po; po = ObjectList.next() ) {
if ( po->points()->count() ) {
//draw the plot object
p->setPen( QColor( po->color() ) );
switch ( po->type() ) {
case KPlotObject::POINTS :
{
p->setBrush( QColor( po->color() ) );
for ( DPoint *dp = po->points()->first(); dp; dp = po->points()->next() ) {
QPoint q = dp->qpoint( PixRect, DataRect );
int x1 = q.x() - po->size()/2;
int y1 = q.y() - po->size()/2;
switch( po->param() ) {
case KPlotObject::CIRCLE : p->drawEllipse( x1, y1, po->size(), po->size() ); break;
case KPlotObject::SQUARE : p->drawRect( x1, y1, po->size(), po->size() ); break;
case KPlotObject::LETTER : p->drawText( q, po->name().left(1) ); break;
default: p->drawPoint( q );
}
}
p->setBrush( Qt::NoBrush );
break;
}
case KPlotObject::CURVE :
{
p->setPen( QPen( QColor( po->color() ), po->size(), (QPen::PenStyle)po->param() ) );
DPoint *dp = po->points()->first();
p->moveTo( dp->qpoint( PixRect, DataRect ) );
for ( dp = po->points()->next(); dp; dp = po->points()->next() )
p->lineTo( dp->qpoint( PixRect, DataRect ) );
break;
}
case KPlotObject::LABEL : //draw label centered at point in x, and slightly below point in y.
{
QPoint q = po->points()->first()->qpoint( PixRect, DataRect );
p->drawText( q.x()-20, q.y()+6, 40, 10, Qt::AlignCenter | Qt::DontClip, po->name() );
break;
}
case KPlotObject::POLYGON :
{
p->setPen( QPen( QColor( po->color() ), po->size(), (QPen::PenStyle)po->param() ) );
p->setBrush( po->color() );
QPointArray a( po->count() );
unsigned int i=0;
for ( DPoint *dp = po->points()->first(); dp; dp = po->points()->next() )
a.setPoint( i++, dp->qpoint( PixRect, DataRect ) );
p->drawPolygon( a );
break;
}
case KPlotObject::UNKNOWN_TYPE : break;
}
}
}
}
double KPlotWidget::dmod( double a, double b ) { return ( b * ( ( a / b ) - int( a / b ) ) ); }
void KPlotWidget::drawBox( QPainter *p ) {
//First, fill in padding region with bgColor() to mask out-of-bounds plot data
p->setPen( bgColor() );
p->setBrush( bgColor() );
//left padding ( don't forget: we have translated by XPADDING, YPADDING )
p->drawRect( -leftPadding(), -topPadding(), leftPadding(), height() );
//right padding
p->drawRect( PixRect.width(), -topPadding(), rightPadding(), height() );
//top padding
p->drawRect( 0, -topPadding(), PixRect.width(), topPadding() );
//bottom padding
p->drawRect( 0, PixRect.height(), PixRect.width(), bottomPadding() );
if ( ShowGrid ) {
//Grid lines are placed at locations of primary axes' major tickmarks
p->setPen( gridColor() );
//vertical grid lines
double x0 = x() - dmod( x(), dXtick ); //zeropoint; x(i) is this plus i*dXtick1
for ( int ix = 0; ix <= nmajX+1; ix++ ) {
int px = int( PixRect.width() * ( (x0 + ix*dXtick - x())/dataWidth() ) );
p->drawLine( px, 0, px, PixRect.height() );
}
//horizontal grid lines
double y0 = y() - dmod( y(), dYtick ); //zeropoint; y(i) is this plus i*mX
for ( int iy = 0; iy <= nmajY+1; iy++ ) {
int py = PixRect.height() - int( PixRect.height() * ( (y0 + iy*dYtick - y())/dataHeight() ) );
p->drawLine( 0, py, PixRect.width(), py );
}
}
p->setPen( fgColor() );
p->setBrush( Qt::NoBrush );
if (BottomAxis.isVisible() || LeftAxis.isVisible()) p->drawRect( PixRect ); //box outline
if ( ShowTickMarks ) {
//spacing between minor tickmarks (in data units)
double dminX = dXtick/nminX;
double dminY = dYtick/nminY;
//set small font for tick labels
QFont f = p->font();
int s = f.pointSize();
f.setPointSize( s - 2 );
p->setFont( f );
//--- Draw bottom X Axis ---//
if (BottomAxis.isVisible()) {
// Draw X tickmarks
double x0 = x() - dmod( x(), dXtick ); //zeropoint; tickmark i is this plus i*dXtick (in data units)
if ( x() < 0.0 ) x0 -= dXtick;
for ( int ix = 0; ix <= nmajX+1; ix++ ) {
//position of tickmark i (in screen units)
int px = int( PixRect.width() * ( (x0 + ix*dXtick - x() )/dataWidth() ) );
if ( px > 0 && px < PixRect.width() ) {
p->drawLine( px, PixRect.height() - 2, px, PixRect.height() - BIGTICKSIZE - 2 );
p->drawLine( px, 0, px, BIGTICKSIZE );
}
//tick label
if ( ShowTickLabels ) {
double lab = x0 + ix*dXtick;
if ( fabs(lab)/dXtick < 0.00001 ) lab = 0.0; //fix occassional roundoff error with "0.0" label
QString str = QString( "%1" ).arg( lab, BottomAxis.labelFieldWidth(), BottomAxis.labelFmt(), BottomAxis.labelPrec() );
if ( px > 0 && px < PixRect.width() ) {
QRect r( px - BIGTICKSIZE, PixRect.height()+BIGTICKSIZE, 2*BIGTICKSIZE, BIGTICKSIZE );
p->drawText( r, Qt::AlignCenter | Qt::DontClip, str );
}
}
//draw minor ticks
for ( int j=0; j < nminX; j++ ) {
//position of minor tickmark j (in screen units)
int pmin = int( px + PixRect.width()*j*dminX/dataWidth() );
if ( pmin > 0 && pmin < PixRect.width() ) {
p->drawLine( pmin, PixRect.height() - 2, pmin, PixRect.height() - SMALLTICKSIZE - 2 );
p->drawLine( pmin, 0, pmin, SMALLTICKSIZE );
}
}
} // end draw X tickmarks
// Draw X Axis Label
if ( ! BottomAxis.label().isEmpty() ) {
QRect r( 0, PixRect.height() + 2*YPADDING, PixRect.width(), YPADDING );
p->drawText( r, Qt::AlignCenter, BottomAxis.label() );
}
}
//--- Draw left Y Axis ---//
if (LeftAxis.isVisible()) {
// Draw Y tickmarks
double y0 = y() - dmod( y(), dYtick ); //zeropoint; tickmark i is this plus i*dYtick1 (in data units)
if ( y() < 0.0 ) y0 -= dYtick;
for ( int iy = 0; iy <= nmajY+1; iy++ ) {
//position of tickmark i (in screen units)
int py = PixRect.height() - int( PixRect.height() * ( (y0 + iy*dYtick - y())/dataHeight() ) );
if ( py > 0 && py < PixRect.height() ) {
p->drawLine( 0, py, BIGTICKSIZE, py );
p->drawLine( PixRect.width()-2, py, PixRect.width()-BIGTICKSIZE-2, py );
}
//tick label
if ( ShowTickLabels ) {
double lab = y0 + iy*dYtick;
if ( fabs(lab)/dYtick < 0.00001 ) lab = 0.0; //fix occassional roundoff error with "0.0" label
QString str = QString( "%1" ).arg( lab, LeftAxis.labelFieldWidth(), LeftAxis.labelFmt(), LeftAxis.labelPrec() );
if ( py > 0 && py < PixRect.height() ) {
QRect r( -2*BIGTICKSIZE, py-SMALLTICKSIZE, 2*BIGTICKSIZE, 2*SMALLTICKSIZE );
p->drawText( r, Qt::AlignCenter | Qt::DontClip, str );
}
}
//minor ticks
for ( int j=0; j < nminY; j++ ) {
//position of minor tickmark j (in screen units)
int pmin = int( py - PixRect.height()*j*dminY/dataHeight() );
if ( pmin > 0 && pmin < PixRect.height() ) {
p->drawLine( 0, pmin, SMALLTICKSIZE, pmin );
p->drawLine( PixRect.width()-2, pmin, PixRect.width()-SMALLTICKSIZE-2, pmin );
}
}
} // end draw Y tickmarks
//Draw Y Axis Label. We need to draw the text sideways.
if ( ! LeftAxis.label().isEmpty() ) {
//store current painter translation/rotation state
p->save();
//translate coord sys to left corner of axis label rectangle, then rotate 90 degrees.
p->translate( -3*XPADDING, PixRect.height() );
p->rotate( -90.0 );
QRect r( 0, 0, PixRect.height(), XPADDING );
p->drawText( r, Qt::AlignCenter, LeftAxis.label() ); //draw the label, now that we are sideways
p->restore(); //restore translation/rotation state
}
}
} //end if ( ShowTickMarks )
}
int KPlotWidget::leftPadding() const {
if ( LeftPadding >= 0 ) return LeftPadding;
if ( ! LeftAxis.label().isEmpty() && ShowTickLabels ) return 3*XPADDING;
if ( ! LeftAxis.label().isEmpty() || ShowTickLabels ) return 2*XPADDING;
return XPADDING;
}
int KPlotWidget::rightPadding() const {
if ( RightPadding >= 0 ) return RightPadding;
return XPADDING;
}
int KPlotWidget::topPadding() const {
if ( TopPadding >= 0 ) return TopPadding;
return YPADDING;
}
int KPlotWidget::bottomPadding() const {
if ( BottomPadding >= 0 ) return BottomPadding;
if ( ! BottomAxis.label().isEmpty() && ShowTickLabels ) return 3*YPADDING;
if ( ! BottomAxis.label().isEmpty() || ShowTickLabels ) return 2*YPADDING;
return YPADDING;
}