From bd0f3345a938b35ce6a12f6150373b0955b8dd12 Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Sun, 10 Jul 2011 15:24:15 -0500 Subject: Add Qt3 development HEAD version --- doc/html/chart-chartform_canvas-cpp.html | 268 +++++++++++++++++++++++++++++++ 1 file changed, 268 insertions(+) create mode 100644 doc/html/chart-chartform_canvas-cpp.html (limited to 'doc/html/chart-chartform_canvas-cpp.html') 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 @@ + + + + + +chart/chartform_canvas.cpp Example File + + + + + + + +
+ +Home + | +All Classes + | +Main Classes + | +Annotated + | +Grouped Classes + | +Functions +

chart/chartform_canvas.cpp Example File

+ + +
#include "canvastext.h"
+#include "chartform.h"
+
+#include <qbrush.h>
+#include <qcanvas.h>
+
+#include <math.h> // sin, cos
+
+#ifndef M_PI
+#define M_PI 3.1415
+#endif
+
+void ChartForm::drawElements()
+{
+    QCanvasItemList list = m_canvas->allItems();
+    for ( QCanvasItemList::iterator it = list.begin(); it != list.end(); ++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 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]);
+            QCanvasEllipse *arc = new QCanvasEllipse(
+                                            size, size, angle, extent, m_canvas );
+            arc->setX( x );
+            arc->setY( y );
+            arc->setZ( 0 );
+            arc->setBrush( QBrush( m_elements[i].valueColor(),
+                                   BrushStyle(m_elements[i].valuePattern()) ) );
+            arc->show();
+            angle += extent;
+            QString label = m_elements[i].label();
+            if ( !label.isEmpty() || 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
+                    QRect rect = arc->boundingRect();
+                    proX = ( rect.width() / 2 ) + rect.x();
+                    proY = ( rect.height() / 2 ) + rect.y();
+                    // Centre text over the centre of the pie segment
+                    rect = text->boundingRect();
+                    proX -= ( rect.width() / 2 );
+                    proY -= ( rect.height() / 2 );
+                    // Make proportional
+                    proX /= width;
+                    proY /= height;
+                }
+                text->setColor( m_elements[i].labelColor() );
+                text->setX( proX * width );
+                text->setY( proY * height );
+                text->setZ( 1 );
+                text->show();
+                m_elements[i].setProX( PIE, proX );
+                m_elements[i].setProY( PIE, proY );
+            }
+        }
+    }
+}
+
+
+void 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;
+    QPen pen;
+    pen.setStyle( NoPen );
+
+    for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
+        if ( m_elements[i].isValid() ) {
+            int extent = int(scales[i]);
+            int y = int(height - extent);
+            QCanvasRectangle *rect = new QCanvasRectangle(
+                                            x, y, prowidth, extent, m_canvas );
+            rect->setBrush( QBrush( m_elements[i].valueColor(),
+                                    BrushStyle(m_elements[i].valuePattern()) ) );
+            rect->setPen( pen );
+            rect->setZ( 0 );
+            rect->show();
+            QString label = m_elements[i].label();
+            if ( !label.isEmpty() || 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->setColor( m_elements[i].labelColor() );
+                text->setX( proX * width );
+                text->setY( proY * height );
+                text->setZ( 1 );
+                text->show();
+                m_elements[i].setProX( VERTICAL_BAR, proX );
+                m_elements[i].setProY( VERTICAL_BAR, proY );
+            }
+            x += prowidth;
+        }
+    }
+}
+
+
+void 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;
+    QPen pen;
+    pen.setStyle( NoPen );
+
+    for ( int i = 0; i < MAX_ELEMENTS; ++i ) {
+        if ( m_elements[i].isValid() ) {
+            int extent = int(scales[i]);
+            QCanvasRectangle *rect = new QCanvasRectangle(
+                                            0, y, extent, proheight, m_canvas );
+            rect->setBrush( QBrush( m_elements[i].valueColor(),
+                                    BrushStyle(m_elements[i].valuePattern()) ) );
+            rect->setPen( pen );
+            rect->setZ( 0 );
+            rect->show();
+            QString label = m_elements[i].label();
+            if ( !label.isEmpty() || 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->setColor( m_elements[i].labelColor() );
+                text->setX( proX * width );
+                text->setY( proY * height );
+                text->setZ( 1 );
+                text->show();
+                m_elements[i].setProX( HORIZONTAL_BAR, proX );
+                m_elements[i].setProY( HORIZONTAL_BAR, proY );
+            }
+            y += proheight;
+        }
+    }
+}
+
+
+QString ChartForm::valueLabel(
+            const QString& label, double value, double total )
+{
+    if ( m_addValues == NO )
+        return label;
+
+    QString newLabel = label;
+    if ( !label.isEmpty() )
+        if ( m_chartType == VERTICAL_BAR )
+            newLabel += '\n';
+        else
+            newLabel += ' ';
+    if ( m_addValues == YES )
+        newLabel += QString::number( value, 'f', m_decimalPlaces );
+    else if ( m_addValues == AS_PERCENTAGE )
+        newLabel += QString::number( (value / total) * 100, 'f', m_decimalPlaces )
+                    + '%';
+    return newLabel;
+}
+
+
+

+ +
Copyright © 2007 +TrolltechTrademarks +
Qt 3.3.8
+
+ -- cgit v1.2.3