<!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 = "tqcanvas-h.html" > tqcanvas.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 = "tqcanvasitemlist.html" > TQCanvasItemList< / a > list = m_canvas-> allItems();
for ( TQCanvasItemList::iterator it = list.< a href = "tqvaluelist.html#begin" > begin< / a > (); it != list.< a href = "tqvaluelist.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 = "tqcanvasellipse.html" > TQCanvasEllipse< / a > *arc = new < a href = "tqcanvasellipse.html" > TQCanvasEllipse< / a > (
size, size, angle, extent, m_canvas );
arc-> < a href = "tqcanvasitem.html#setX" > setX< / a > ( x );
arc-> < a href = "tqcanvasitem.html#setY" > setY< / a > ( y );
arc-> < a href = "tqcanvasitem.html#setZ" > setZ< / a > ( 0 );
arc-> < a href = "tqcanvaspolygonalitem.html#setBrush" > setBrush< / a > ( TQBrush( m_elements[i].valueColor(),
BrushStyle(m_elements[i].valuePattern()) ) );
arc-> < a href = "tqcanvasitem.html#show" > show< / a > ();
angle += extent;
< a href = "tqstring.html" > TQString< / a > label = m_elements[i].label();
if ( !label.< a href = "tqstring.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 = "tqcanvaspolygonalitem.html#boundingRect" > boundingRect< / a > ();
proX = ( rect.< a href = "tqcanvasrectangle.html#width" > width< / a > () / 2 ) + rect.< a href = "tqcanvasitem.html#x" > x< / a > ();
proY = ( rect.< a href = "tqcanvasrectangle.html#height" > height< / a > () / 2 ) + rect.< a href = "tqcanvasitem.html#y" > y< / a > ();
// Centre text over the centre of the pie segment
rect = text-> < a href = "tqcanvastext.html#boundingRect" > boundingRect< / a > ();
proX -= ( rect.< a href = "tqcanvasrectangle.html#width" > width< / a > () / 2 );
proY -= ( rect.< a href = "tqcanvasrectangle.html#height" > height< / a > () / 2 );
// Make proportional
proX /= width;
proY /= height;
}
text-> < a href = "tqcanvastext.html#setColor" > setColor< / a > ( m_elements[i].labelColor() );
text-> < a href = "tqcanvasitem.html#setX" > setX< / a > ( proX * width );
text-> < a href = "tqcanvasitem.html#setY" > setY< / a > ( proY * height );
text-> < a href = "tqcanvasitem.html#setZ" > setZ< / a > ( 1 );
text-> < a href = "tqcanvasitem.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 = "tqcanvasrectangle.html" > TQCanvasRectangle< / a > *rect = new < a href = "tqcanvasrectangle.html" > TQCanvasRectangle< / a > (
x, y, prowidth, extent, m_canvas );
rect-> < a href = "tqcanvaspolygonalitem.html#setBrush" > setBrush< / a > ( TQBrush( m_elements[i].valueColor(),
BrushStyle(m_elements[i].valuePattern()) ) );
rect-> < a href = "tqcanvaspolygonalitem.html#setPen" > setPen< / a > ( pen );
rect-> < a href = "tqcanvasitem.html#setZ" > setZ< / a > ( 0 );
rect-> < a href = "tqcanvasitem.html#show" > show< / a > ();
< a href = "tqstring.html" > TQString< / a > label = m_elements[i].label();
if ( !label.< a href = "tqstring.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 = "tqcanvastext.html#setColor" > setColor< / a > ( m_elements[i].labelColor() );
text-> < a href = "tqcanvasitem.html#setX" > setX< / a > ( proX * width );
text-> < a href = "tqcanvasitem.html#setY" > setY< / a > ( proY * height );
text-> < a href = "tqcanvasitem.html#setZ" > setZ< / a > ( 1 );
text-> < a href = "tqcanvasitem.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 = "tqcanvasrectangle.html" > TQCanvasRectangle< / a > *rect = new < a href = "tqcanvasrectangle.html" > TQCanvasRectangle< / a > (
0, y, extent, proheight, m_canvas );
rect-> < a href = "tqcanvaspolygonalitem.html#setBrush" > setBrush< / a > ( TQBrush( m_elements[i].valueColor(),
BrushStyle(m_elements[i].valuePattern()) ) );
rect-> < a href = "tqcanvaspolygonalitem.html#setPen" > setPen< / a > ( pen );
rect-> < a href = "tqcanvasitem.html#setZ" > setZ< / a > ( 0 );
rect-> < a href = "tqcanvasitem.html#show" > show< / a > ();
< a href = "tqstring.html" > TQString< / a > label = m_elements[i].label();
if ( !label.< a href = "tqstring.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 = "tqcanvastext.html#setColor" > setColor< / a > ( m_elements[i].labelColor() );
text-> < a href = "tqcanvasitem.html#setX" > setX< / a > ( proX * width );
text-> < a href = "tqcanvasitem.html#setY" > setY< / a > ( proY * height );
text-> < a href = "tqcanvasitem.html#setZ" > setZ< / a > ( 1 );
text-> < a href = "tqcanvasitem.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 = "tqstring.html" > TQString< / a > & label, double value, double total )
{
if ( m_addValues == NO )
return label;
< a href = "tqstring.html" > TQString< / a > newLabel = label;
if ( !label.< a href = "tqstring.html#isEmpty" > isEmpty< / a > () )
if ( m_chartType == VERTICAL_BAR )
newLabel += '\n';
else
newLabel += ' ';
if ( m_addValues == YES )
newLabel += TQString::< a href = "tqstring.html#number" > number< / a > ( value, 'f', m_decimalPlaces );
else if ( m_addValues == AS_PERCENTAGE )
newLabel += TQString::< a href = "tqstring.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 >
