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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
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tree7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/chart-chartform_canvas-cpp.html
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+<title>chart/chartform_canvas.cpp Example File</title>
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+<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 &lt;<a href="qbrush-h.html">qbrush.h</a>&gt;
+#include &lt;<a href="qcanvas-h.html">qcanvas.h</a>&gt;
+
+#include &lt;math.h&gt; // 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-&gt;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-&gt;height() :
+ m_canvas-&gt;width();
+ double biggest = 0.0;
+ int count = 0;
+ double total = 0.0;
+ static double scales[MAX_ELEMENTS];
+
+ for ( int i = 0; i &lt; MAX_ELEMENTS; ++i ) {
+ if ( m_elements[i].isValid() ) {
+ double value = m_elements[i].value();
+ count++;
+ total += value;
+ if ( value &gt; biggest )
+ biggest = value;
+ scales[i] = m_elements[i].value() * scaleFactor;
+ }
+ }
+
+ if ( count ) {
+ // 2nd loop because of total and biggest
+ for ( int i = 0; i &lt; 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-&gt;update();
+}
+
+
+void <a name="f168"></a>ChartForm::drawPieChart( const double scales[], double total, int )
+{
+ double width = m_canvas-&gt;width();
+ double height = m_canvas-&gt;height();
+ int size = int(width &gt; height ? height : width);
+ int x = int(width / 2);
+ int y = int(height / 2);
+ int angle = 0;
+
+ for ( int i = 0; i &lt; 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-&gt;<a href="qcanvasitem.html#setX">setX</a>( x );
+ arc-&gt;<a href="qcanvasitem.html#setY">setY</a>( y );
+ arc-&gt;<a href="qcanvasitem.html#setZ">setZ</a>( 0 );
+ arc-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QBrush( m_elements[i].valueColor(),
+ BrushStyle(m_elements[i].valuePattern()) ) );
+ arc-&gt;<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 &lt; 0 || proY &lt; 0 ) {
+ // Find the centre of the pie segment
+ <a href="qrect.html">QRect</a> rect = arc-&gt;<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-&gt;<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-&gt;<a href="qcanvastext.html#setColor">setColor</a>( m_elements[i].labelColor() );
+ text-&gt;<a href="qcanvasitem.html#setX">setX</a>( proX * width );
+ text-&gt;<a href="qcanvasitem.html#setY">setY</a>( proY * height );
+ text-&gt;<a href="qcanvasitem.html#setZ">setZ</a>( 1 );
+ text-&gt;<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-&gt;width();
+ double height = m_canvas-&gt;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 &lt; 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-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QBrush( m_elements[i].valueColor(),
+ BrushStyle(m_elements[i].valuePattern()) ) );
+ rect-&gt;<a href="qcanvaspolygonalitem.html#setPen">setPen</a>( pen );
+ rect-&gt;<a href="qcanvasitem.html#setZ">setZ</a>( 0 );
+ rect-&gt;<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 &lt; 0 || proY &lt; 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-&gt;<a href="qcanvastext.html#setColor">setColor</a>( m_elements[i].labelColor() );
+ text-&gt;<a href="qcanvasitem.html#setX">setX</a>( proX * width );
+ text-&gt;<a href="qcanvasitem.html#setY">setY</a>( proY * height );
+ text-&gt;<a href="qcanvasitem.html#setZ">setZ</a>( 1 );
+ text-&gt;<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-&gt;width();
+ double height = m_canvas-&gt;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 &lt; 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-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QBrush( m_elements[i].valueColor(),
+ BrushStyle(m_elements[i].valuePattern()) ) );
+ rect-&gt;<a href="qcanvaspolygonalitem.html#setPen">setPen</a>( pen );
+ rect-&gt;<a href="qcanvasitem.html#setZ">setZ</a>( 0 );
+ rect-&gt;<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 &lt; 0 || proY &lt; 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-&gt;<a href="qcanvastext.html#setColor">setColor</a>( m_elements[i].labelColor() );
+ text-&gt;<a href="qcanvasitem.html#setX">setX</a>( proX * width );
+ text-&gt;<a href="qcanvasitem.html#setY">setY</a>( proY * height );
+ text-&gt;<a href="qcanvasitem.html#setZ">setZ</a>( 1 );
+ text-&gt;<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>&amp; 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 -->
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+<table width=100% cellspacing=0 border=0><tr>
+<td>Copyright &copy; 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>
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