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qt3/doc/html/chart-chartform_canvas-cpp....

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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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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<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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