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diff --git a/doc/html/chart-chartform_canvas-cpp.html b/doc/html/chart-chartform_canvas-cpp.html new file mode 100644 index 0000000..daf112a --- /dev/null +++ b/doc/html/chart-chartform_canvas-cpp.html @@ -0,0 +1,268 @@ +<!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">qbrush.h</a>> +#include <<a href="qcanvas-h.html">qcanvas.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">QCanvasItemList</a> list = m_canvas->allItems(); + for ( QCanvasItemList::iterator it = list.<a href="qvaluelist.html#begin">begin</a>(); it != list.<a href="qvaluelist.html#end">end</a>(); ++it ) + delete *it; + + // 360 * 16 for pies; Qt 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">QCanvasEllipse</a> *arc = new <a href="qcanvasellipse.html">QCanvasEllipse</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>( QBrush( m_elements[i].valueColor(), + BrushStyle(m_elements[i].valuePattern()) ) ); + arc-><a href="qcanvasitem.html#show">show</a>(); + angle += extent; + <a href="qstring.html">QString</a> label = m_elements[i].label(); + if ( !label.<a href="qstring.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="qrect.html">QRect</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="qpen.html">QPen</a> pen; + pen.<a href="qpen.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">QCanvasRectangle</a> *rect = new <a href="qcanvasrectangle.html">QCanvasRectangle</a>( + x, y, prowidth, extent, m_canvas ); + rect-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QBrush( 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="qstring.html">QString</a> label = m_elements[i].label(); + if ( !label.<a href="qstring.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="qpen.html">QPen</a> pen; + pen.<a href="qpen.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">QCanvasRectangle</a> *rect = new <a href="qcanvasrectangle.html">QCanvasRectangle</a>( + 0, y, extent, proheight, m_canvas ); + rect-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QBrush( 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="qstring.html">QString</a> label = m_elements[i].label(); + if ( !label.<a href="qstring.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; + } + } +} + + +QString <a name="f171"></a>ChartForm::valueLabel( + const <a href="qstring.html">QString</a>& label, double value, double total ) +{ + if ( m_addValues == NO ) + return label; + + <a href="qstring.html">QString</a> newLabel = label; + if ( !label.<a href="qstring.html#isEmpty">isEmpty</a>() ) + if ( m_chartType == VERTICAL_BAR ) + newLabel += '\n'; + else + newLabel += ' '; + if ( m_addValues == YES ) + newLabel += QString::<a href="qstring.html#number">number</a>( value, 'f', m_decimalPlaces ); + else if ( m_addValues == AS_PERCENTAGE ) + newLabel += QString::<a href="qstring.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>Qt 3.3.8</div> +</table></div></address></body> +</html> |