<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tutorial2.doc:10 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>chart/chartform_canvas.cpp Example File</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>chart/chartform_canvas.cpp Example File</h1> <pre>#include "canvastext.h" #include "chartform.h" #include <<a href="qbrush-h.html">ntqbrush.h</a>> #include <<a href="qcanvas-h.html">ntqcanvas.h</a>> #include <math.h> // sin, cos #ifndef M_PI #define M_PI 3.1415 #endif void <a name="f167"></a>ChartForm::drawElements() { <a href="qcanvasitemlist.html">TQCanvasItemList</a> list = m_canvas->allItems(); for ( TQCanvasItemList::iterator it = list.<a href="ntqvaluelist.html#begin">begin</a>(); it != list.<a href="ntqvaluelist.html#end">end</a>(); ++it ) delete *it; // 360 * 16 for pies; TQt works with 16ths of degrees int scaleFactor = m_chartType == PIE ? 5760 : m_chartType == VERTICAL_BAR ? m_canvas->height() : m_canvas->width(); double biggest = 0.0; int count = 0; double total = 0.0; static double scales[MAX_ELEMENTS]; for ( int i = 0; i < MAX_ELEMENTS; ++i ) { if ( m_elements[i].isValid() ) { double value = m_elements[i].value(); count++; total += value; if ( value > biggest ) biggest = value; scales[i] = m_elements[i].value() * scaleFactor; } } if ( count ) { // 2nd loop because of total and biggest for ( int i = 0; i < MAX_ELEMENTS; ++i ) if ( m_elements[i].isValid() ) if ( m_chartType == PIE ) scales[i] = (m_elements[i].value() * scaleFactor) / total; else scales[i] = (m_elements[i].value() * scaleFactor) / biggest; switch ( m_chartType ) { case PIE: drawPieChart( scales, total, count ); break; case VERTICAL_BAR: drawVerticalBarChart( scales, total, count ); break; case HORIZONTAL_BAR: drawHorizontalBarChart( scales, total, count ); break; } } m_canvas->update(); } void <a name="f168"></a>ChartForm::drawPieChart( const double scales[], double total, int ) { double width = m_canvas->width(); double height = m_canvas->height(); int size = int(width > height ? height : width); int x = int(width / 2); int y = int(height / 2); int angle = 0; for ( int i = 0; i < MAX_ELEMENTS; ++i ) { if ( m_elements[i].isValid() ) { int extent = int(scales[i]); <a href="qcanvasellipse.html">TQCanvasEllipse</a> *arc = new <a href="qcanvasellipse.html">TQCanvasEllipse</a>( size, size, angle, extent, m_canvas ); arc-><a href="qcanvasitem.html#setX">setX</a>( x ); arc-><a href="qcanvasitem.html#setY">setY</a>( y ); arc-><a href="qcanvasitem.html#setZ">setZ</a>( 0 ); arc-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( TQBrush( m_elements[i].valueColor(), BrushStyle(m_elements[i].valuePattern()) ) ); arc-><a href="qcanvasitem.html#show">show</a>(); angle += extent; <a href="ntqstring.html">TQString</a> label = m_elements[i].label(); if ( !label.<a href="ntqstring.html#isEmpty">isEmpty</a>() || m_addValues != NO ) { label = valueLabel( label, m_elements[i].value(), total ); CanvasText *text = new CanvasText( i, label, m_font, m_canvas ); double proX = m_elements[i].proX( PIE ); double proY = m_elements[i].proY( PIE ); if ( proX < 0 || proY < 0 ) { // Find the centre of the pie segment <a href="ntqrect.html">TQRect</a> rect = arc-><a href="qcanvaspolygonalitem.html#boundingRect">boundingRect</a>(); proX = ( rect.<a href="qcanvasrectangle.html#width">width</a>() / 2 ) + rect.<a href="qcanvasitem.html#x">x</a>(); proY = ( rect.<a href="qcanvasrectangle.html#height">height</a>() / 2 ) + rect.<a href="qcanvasitem.html#y">y</a>(); // Centre text over the centre of the pie segment rect = text-><a href="qcanvastext.html#boundingRect">boundingRect</a>(); proX -= ( rect.<a href="qcanvasrectangle.html#width">width</a>() / 2 ); proY -= ( rect.<a href="qcanvasrectangle.html#height">height</a>() / 2 ); // Make proportional proX /= width; proY /= height; } text-><a href="qcanvastext.html#setColor">setColor</a>( m_elements[i].labelColor() ); text-><a href="qcanvasitem.html#setX">setX</a>( proX * width ); text-><a href="qcanvasitem.html#setY">setY</a>( proY * height ); text-><a href="qcanvasitem.html#setZ">setZ</a>( 1 ); text-><a href="qcanvasitem.html#show">show</a>(); m_elements[i].setProX( PIE, proX ); m_elements[i].setProY( PIE, proY ); } } } } void <a name="f169"></a>ChartForm::drawVerticalBarChart( const double scales[], double total, int count ) { double width = m_canvas->width(); double height = m_canvas->height(); int prowidth = int(width / count); int x = 0; <a href="ntqpen.html">TQPen</a> pen; pen.<a href="ntqpen.html#setStyle">setStyle</a>( NoPen ); for ( int i = 0; i < MAX_ELEMENTS; ++i ) { if ( m_elements[i].isValid() ) { int extent = int(scales[i]); int y = int(height - extent); <a href="qcanvasrectangle.html">TQCanvasRectangle</a> *rect = new <a href="qcanvasrectangle.html">TQCanvasRectangle</a>( x, y, prowidth, extent, m_canvas ); rect-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( TQBrush( m_elements[i].valueColor(), BrushStyle(m_elements[i].valuePattern()) ) ); rect-><a href="qcanvaspolygonalitem.html#setPen">setPen</a>( pen ); rect-><a href="qcanvasitem.html#setZ">setZ</a>( 0 ); rect-><a href="qcanvasitem.html#show">show</a>(); <a href="ntqstring.html">TQString</a> label = m_elements[i].label(); if ( !label.<a href="ntqstring.html#isEmpty">isEmpty</a>() || m_addValues != NO ) { double proX = m_elements[i].proX( VERTICAL_BAR ); double proY = m_elements[i].proY( VERTICAL_BAR ); if ( proX < 0 || proY < 0 ) { proX = x / width; proY = y / height; } label = valueLabel( label, m_elements[i].value(), total ); CanvasText *text = new CanvasText( i, label, m_font, m_canvas ); text-><a href="qcanvastext.html#setColor">setColor</a>( m_elements[i].labelColor() ); text-><a href="qcanvasitem.html#setX">setX</a>( proX * width ); text-><a href="qcanvasitem.html#setY">setY</a>( proY * height ); text-><a href="qcanvasitem.html#setZ">setZ</a>( 1 ); text-><a href="qcanvasitem.html#show">show</a>(); m_elements[i].setProX( VERTICAL_BAR, proX ); m_elements[i].setProY( VERTICAL_BAR, proY ); } x += prowidth; } } } void <a name="f170"></a>ChartForm::drawHorizontalBarChart( const double scales[], double total, int count ) { double width = m_canvas->width(); double height = m_canvas->height(); int proheight = int(height / count); int y = 0; <a href="ntqpen.html">TQPen</a> pen; pen.<a href="ntqpen.html#setStyle">setStyle</a>( NoPen ); for ( int i = 0; i < MAX_ELEMENTS; ++i ) { if ( m_elements[i].isValid() ) { int extent = int(scales[i]); <a href="qcanvasrectangle.html">TQCanvasRectangle</a> *rect = new <a href="qcanvasrectangle.html">TQCanvasRectangle</a>( 0, y, extent, proheight, m_canvas ); rect-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( TQBrush( m_elements[i].valueColor(), BrushStyle(m_elements[i].valuePattern()) ) ); rect-><a href="qcanvaspolygonalitem.html#setPen">setPen</a>( pen ); rect-><a href="qcanvasitem.html#setZ">setZ</a>( 0 ); rect-><a href="qcanvasitem.html#show">show</a>(); <a href="ntqstring.html">TQString</a> label = m_elements[i].label(); if ( !label.<a href="ntqstring.html#isEmpty">isEmpty</a>() || m_addValues != NO ) { double proX = m_elements[i].proX( HORIZONTAL_BAR ); double proY = m_elements[i].proY( HORIZONTAL_BAR ); if ( proX < 0 || proY < 0 ) { proX = 0; proY = y / height; } label = valueLabel( label, m_elements[i].value(), total ); CanvasText *text = new CanvasText( i, label, m_font, m_canvas ); text-><a href="qcanvastext.html#setColor">setColor</a>( m_elements[i].labelColor() ); text-><a href="qcanvasitem.html#setX">setX</a>( proX * width ); text-><a href="qcanvasitem.html#setY">setY</a>( proY * height ); text-><a href="qcanvasitem.html#setZ">setZ</a>( 1 ); text-><a href="qcanvasitem.html#show">show</a>(); m_elements[i].setProX( HORIZONTAL_BAR, proX ); m_elements[i].setProY( HORIZONTAL_BAR, proY ); } y += proheight; } } } TQString <a name="f171"></a>ChartForm::valueLabel( const <a href="ntqstring.html">TQString</a>& label, double value, double total ) { if ( m_addValues == NO ) return label; <a href="ntqstring.html">TQString</a> newLabel = label; if ( !label.<a href="ntqstring.html#isEmpty">isEmpty</a>() ) if ( m_chartType == VERTICAL_BAR ) newLabel += '\n'; else newLabel += ' '; if ( m_addValues == YES ) newLabel += TQString::<a href="ntqstring.html#number">number</a>( value, 'f', m_decimalPlaces ); else if ( m_addValues == AS_PERCENTAGE ) newLabel += TQString::<a href="ntqstring.html#number">number</a>( (value / total) * 100, 'f', m_decimalPlaces ) + '%'; return newLabel; } </pre><!-- eof --> <p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>TQt 3.3.8</div> </table></div></address></body> </html>