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227 lines
6.3 KiB
227 lines
6.3 KiB
14 years ago
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#include "canvastext.h"
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#include "chartform.h"
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#include <qbrush.h>
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#include <qcanvas.h>
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#include <math.h> // sin, cos
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#ifndef M_PI
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#define M_PI 3.1415
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#endif
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void ChartForm::drawElements()
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{
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QCanvasItemList list = m_canvas->allItems();
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for ( QCanvasItemList::iterator it = list.begin(); it != list.end(); ++it )
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delete *it;
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// 360 * 16 for pies; Qt works with 16ths of degrees
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int scaleFactor = m_chartType == PIE ? 5760 :
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m_chartType == VERTICAL_BAR ? m_canvas->height() :
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m_canvas->width();
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double biggest = 0.0;
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int count = 0;
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double total = 0.0;
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static double scales[MAX_ELEMENTS];
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for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
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if ( m_elements[i].isValid() ) {
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double value = m_elements[i].value();
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count++;
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total += value;
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if ( value > biggest )
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biggest = value;
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scales[i] = m_elements[i].value() * scaleFactor;
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}
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}
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if ( count ) {
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// 2nd loop because of total and biggest
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for ( int i = 0; i < MAX_ELEMENTS; ++i )
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if ( m_elements[i].isValid() )
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if ( m_chartType == PIE )
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scales[i] = (m_elements[i].value() * scaleFactor) / total;
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else
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scales[i] = (m_elements[i].value() * scaleFactor) / biggest;
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switch ( m_chartType ) {
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case PIE:
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drawPieChart( scales, total, count );
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break;
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case VERTICAL_BAR:
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drawVerticalBarChart( scales, total, count );
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break;
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case HORIZONTAL_BAR:
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drawHorizontalBarChart( scales, total, count );
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break;
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}
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}
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m_canvas->update();
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}
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void ChartForm::drawPieChart( const double scales[], double total, int )
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{
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double width = m_canvas->width();
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double height = m_canvas->height();
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int size = int(width > height ? height : width);
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int x = int(width / 2);
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int y = int(height / 2);
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int angle = 0;
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for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
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if ( m_elements[i].isValid() ) {
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int extent = int(scales[i]);
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QCanvasEllipse *arc = new QCanvasEllipse(
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size, size, angle, extent, m_canvas );
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arc->setX( x );
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arc->setY( y );
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arc->setZ( 0 );
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arc->setBrush( QBrush( m_elements[i].valueColor(),
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BrushStyle(m_elements[i].valuePattern()) ) );
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arc->show();
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angle += extent;
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QString label = m_elements[i].label();
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if ( !label.isEmpty() || m_addValues != NO ) {
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label = valueLabel( label, m_elements[i].value(), total );
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CanvasText *text = new CanvasText( i, label, m_font, m_canvas );
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double proX = m_elements[i].proX( PIE );
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double proY = m_elements[i].proY( PIE );
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if ( proX < 0 || proY < 0 ) {
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// Find the centre of the pie segment
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QRect rect = arc->boundingRect();
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proX = ( rect.width() / 2 ) + rect.x();
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proY = ( rect.height() / 2 ) + rect.y();
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// Centre text over the centre of the pie segment
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rect = text->boundingRect();
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proX -= ( rect.width() / 2 );
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proY -= ( rect.height() / 2 );
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// Make proportional
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proX /= width;
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proY /= height;
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}
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text->setColor( m_elements[i].labelColor() );
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text->setX( proX * width );
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text->setY( proY * height );
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text->setZ( 1 );
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text->show();
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m_elements[i].setProX( PIE, proX );
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m_elements[i].setProY( PIE, proY );
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}
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}
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}
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}
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void ChartForm::drawVerticalBarChart(
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const double scales[], double total, int count )
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{
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double width = m_canvas->width();
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double height = m_canvas->height();
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int prowidth = int(width / count);
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int x = 0;
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QPen pen;
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pen.setStyle( NoPen );
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for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
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if ( m_elements[i].isValid() ) {
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int extent = int(scales[i]);
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int y = int(height - extent);
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QCanvasRectangle *rect = new QCanvasRectangle(
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x, y, prowidth, extent, m_canvas );
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rect->setBrush( QBrush( m_elements[i].valueColor(),
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BrushStyle(m_elements[i].valuePattern()) ) );
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rect->setPen( pen );
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rect->setZ( 0 );
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rect->show();
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QString label = m_elements[i].label();
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if ( !label.isEmpty() || m_addValues != NO ) {
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double proX = m_elements[i].proX( VERTICAL_BAR );
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double proY = m_elements[i].proY( VERTICAL_BAR );
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if ( proX < 0 || proY < 0 ) {
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proX = x / width;
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proY = y / height;
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}
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label = valueLabel( label, m_elements[i].value(), total );
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CanvasText *text = new CanvasText( i, label, m_font, m_canvas );
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text->setColor( m_elements[i].labelColor() );
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text->setX( proX * width );
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text->setY( proY * height );
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text->setZ( 1 );
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text->show();
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m_elements[i].setProX( VERTICAL_BAR, proX );
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m_elements[i].setProY( VERTICAL_BAR, proY );
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}
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x += prowidth;
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}
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}
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}
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void ChartForm::drawHorizontalBarChart(
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const double scales[], double total, int count )
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{
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double width = m_canvas->width();
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double height = m_canvas->height();
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int proheight = int(height / count);
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int y = 0;
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QPen pen;
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pen.setStyle( NoPen );
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for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
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if ( m_elements[i].isValid() ) {
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int extent = int(scales[i]);
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QCanvasRectangle *rect = new QCanvasRectangle(
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0, y, extent, proheight, m_canvas );
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rect->setBrush( QBrush( m_elements[i].valueColor(),
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BrushStyle(m_elements[i].valuePattern()) ) );
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rect->setPen( pen );
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rect->setZ( 0 );
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rect->show();
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QString label = m_elements[i].label();
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if ( !label.isEmpty() || m_addValues != NO ) {
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double proX = m_elements[i].proX( HORIZONTAL_BAR );
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double proY = m_elements[i].proY( HORIZONTAL_BAR );
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if ( proX < 0 || proY < 0 ) {
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proX = 0;
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proY = y / height;
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}
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label = valueLabel( label, m_elements[i].value(), total );
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CanvasText *text = new CanvasText( i, label, m_font, m_canvas );
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text->setColor( m_elements[i].labelColor() );
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text->setX( proX * width );
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text->setY( proY * height );
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text->setZ( 1 );
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text->show();
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m_elements[i].setProX( HORIZONTAL_BAR, proX );
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m_elements[i].setProY( HORIZONTAL_BAR, proY );
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}
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y += proheight;
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}
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}
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}
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QString ChartForm::valueLabel(
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const QString& label, double value, double total )
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{
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if ( m_addValues == NO )
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return label;
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QString newLabel = label;
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if ( !label.isEmpty() )
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if ( m_chartType == VERTICAL_BAR )
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newLabel += '\n';
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else
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newLabel += ' ';
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if ( m_addValues == YES )
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newLabel += QString::number( value, 'f', m_decimalPlaces );
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else if ( m_addValues == AS_PERCENTAGE )
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newLabel += QString::number( (value / total) * 100, 'f', m_decimalPlaces )
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+ '%';
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return newLabel;
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}
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