Implementing charting...

6 files changed, 241 insertions, 39 deletions

diff --git a/noncore/apps/checkbook/checkbook.cpp b/noncore/apps/checkbook/checkbook.cpp
index 20b42b5..77c1f57 100644
--- a/noncore/apps/checkbook/checkbook.cpp
+++ b/noncore/apps/checkbook/checkbook.cpp
@@ -231,35 +231,32 @@ QWidget *Checkbook::initTransactions()
 }
 
 QWidget *Checkbook::initCharts()
 {
+	graphInfo = 0x0;
+
 	QWidget *control = new QWidget( mainWidget );
 
 	QGridLayout *layout = new QGridLayout( control );
 	layout->setSpacing( 2 );
 	layout->setMargin( 4 );
 
-/*
-	QLabel *label = new QLabel( control );
-	label->setText( tr( "Graph type:" ) );
-	layout->addWidget( label, 0, 0 );
+	graphWidget = new Graph( control );
+	QWhatsThis::add( graphWidget, tr( "Select the desired chart below and then click on the Draw button." ) );
+	layout->addMultiCellWidget( graphWidget, 0, 0, 0, 2 );
+
 	graphList = new QComboBox( control );
-	graphList->insertItem( tr( "By category" ) );
-	graphList->insertItem( tr( "..." ) );
-	graphList->insertItem( tr( "..." ) );
-	layout->addWidget( graphList, 0, 1 );
-*/
+	QWhatsThis::add( graphList, tr( "Click here to select the desired chart type." ) );
+	graphList->insertItem( tr( "Account balance" ) );
+	graphList->insertItem( tr( "Withdrawals by category" ) );
+	graphList->insertItem( tr( "Deposits by category" ) );
 
-	GraphInfo* info = new GraphInfo( GraphInfo::BarChart, 0x0, tr( "Graph Title" ),
-									 tr( "X-Axis" ), tr( "Y-Axis" ) );
-	graphWidget = new Graph( control, info );
-	QWhatsThis::add( graphWidget, tr( "Charting is not implemented yet." ) );
-	layout->addMultiCellWidget( graphWidget, 0, 0, 0, 1 );
+	layout->addMultiCellWidget( graphList, 1, 1, 0, 1 );
 
 	QPushButton *btn = new QPushButton( Resource::loadPixmap( "checkbook/drawbtn" ), tr( "Draw" ), control );
-	QWhatsThis::add( btn, tr( "Click here to draw the chart." ) );
+	QWhatsThis::add( btn, tr( "Click here to draw the selected chart." ) );
 	connect( btn, SIGNAL( clicked() ), this, SLOT( slotDrawGraph() ) );
-	layout->addWidget( btn, 1, 1 );
+	layout->addWidget( btn, 1, 2 );
 
 	return control;
 }
 
@@ -366,14 +363,12 @@ void Checkbook::accept()
 	config->writeEntry( "Balance", balanceEdit->text() );
 	config->writeEntry( "Notes", notesEdit->text() );
 
 	// Save transactions
-	TranInfo *tran = transactions.first();
 	int i = 1;
-	while ( tran )
+	for ( TranInfo *tran = transactions.first(); tran; tran = transactions.next() )
 	{
 		tran->write( config, i );
-		tran = transactions.next();
 		i++;
 	}
 	config->write();
 
@@ -508,5 +503,94 @@ void Checkbook::slotDeleteTran()
 }
 
 void Checkbook::slotDrawGraph()
 {
+	if ( graphInfo )
+	{
+		delete graphInfo;
+	}
+
+	switch ( graphList->currentItem() )
+	{
+		case 0 : drawBalanceChart();
+			break;
+		case 1 : drawCategoryChart( TRUE );
+			break;
+		case 2 : drawCategoryChart( FALSE );
+			break;
+	};
+
+	graphWidget->setGraphInfo( graphInfo );
+	graphWidget->drawGraph( TRUE );
+}
+
+void Checkbook::drawBalanceChart()
+{
+	DataPointList *list = new DataPointList();
+
+	float balance = startBalance;
+	float amount;
+	QString label;
+	int i = 0;
+	int count = transactions.count();
+
+	for ( TranInfo *tran = transactions.first(); tran; tran = transactions.next() )
+	{
+		i++;
+		balance -= tran->fee();
+		amount = tran->amount();
+		if ( tran->withdrawal() )
+		{
+			amount *= -1;
+		}
+		balance += amount;
+		if ( i == 1 || i == count / 2 || i == count )
+		{
+			label = tran->datestr();
+		}
+		else
+		{
+			label = "";
+		}
+		list->append( new DataPointInfo( label, balance ) );
+	}
+
+	graphInfo = new GraphInfo( GraphInfo::BarChart, list );
+}
+
+void Checkbook::drawCategoryChart( bool withdrawals )
+{
+	DataPointList *list = new DataPointList();
+
+	TranInfo *tran = transactions.first();
+	if ( tran->withdrawal() == withdrawals )
+	{
+		list->append( new DataPointInfo( tran->category(), tran->amount() ) );
+	}
+	tran = transactions.next();
+
+	DataPointInfo *cat;
+	for ( ; tran; tran = transactions.next() )
+	{
+		if ( tran->withdrawal() == withdrawals )
+		{
+			// Find category in list
+			for ( cat = list->first(); cat; cat = list->next() )
+			{
+				if ( cat->label() == tran->category() )
+				{
+					break;
+				}
+			}
+			if ( cat && cat->label() == tran->category() )
+			{ // Found category, add to transaction to category total
+				cat->addToValue( tran->amount() );
+			}
+			else
+			{ // Didn't find category, add category to list
+				list->append( new DataPointInfo( tran->category(), tran->amount() ) );
+			}
+		}
+	}
+
+	graphInfo = new GraphInfo( GraphInfo::PieChart, list );
 }
diff --git a/noncore/apps/checkbook/checkbook.h b/noncore/apps/checkbook/checkbook.h
index 01f1115..287788a 100644
--- a/noncore/apps/checkbook/checkbook.h
+++ b/noncore/apps/checkbook/checkbook.h
@@ -35,8 +35,9 @@
 
 class OTabWidget;
 
 class Graph;
+class GraphInfo;
 class QComboBox;
 class QLabel;
 class QLineEdit;
 class QListView;
@@ -83,11 +84,15 @@ class Checkbook : public QDialog
 		QLabel    *balanceLabel;
 		float      currBalance;
 
 		// Charts tab
-		QWidget    *initCharts();
-		//QComboBox *graphList;
-		Graph      *graphWidget;
+		QWidget   *initCharts();
+		GraphInfo *graphInfo;
+		QComboBox *graphList;
+		Graph     *graphWidget;
+
+		void drawBalanceChart();
+		void drawCategoryChart( bool = TRUE );
 
 	protected slots:
 		void accept();
 
diff --git a/noncore/apps/checkbook/graph.cpp b/noncore/apps/checkbook/graph.cpp
index bae92da..a0d8b78 100644
--- a/noncore/apps/checkbook/graph.cpp
+++ b/noncore/apps/checkbook/graph.cpp
@@ -28,15 +28,15 @@
 
 #include "graph.h"
 #include "graphinfo.h"
 
+#include <qcolor.h>
+#include <qfontmetrics.h>
 #include <qpainter.h>
 
 Graph::Graph( QWidget *parent, GraphInfo *d, const QString &name, int flags )
 	: QWidget( parent, name, flags )
 {
-	setBackgroundMode( QWidget::PaletteBase );
-
 	data = d;
 
 	graph.setOptimization( QPixmap::BestOptim );
 }
@@ -81,32 +81,99 @@ void Graph::initGraph()
 	switch ( data->graphType() )
 	{
 		case GraphInfo::BarChart :
 		{
-			drawBarChart();
+			drawBarChart( width(), height(), data->maxValue() );
 		}
 		break;
 		case GraphInfo::LineChart :
 		{
-			drawLineChart();
+			//drawLineChart( p, s, min, max );
 		}
 		break;
 		case GraphInfo::PieChart :
 		{
-			drawPieChart();
+			drawPieChart( width(), height(), data->totalValue() );
 		}
 	};
 }
 
-void Graph::drawBarChart()
+void Graph::drawBarChart( int width, int height, float max )
 {
-	//Find max value in GraphInfo->dataPoints() - make function in GraphInfo!!!
+	QPainter p( &graph );
+
+	// Try to set the font size smaller for text
+	QFont f = font();
+	f.setPointSize( 8 );
+	p.setFont( f );
+
+	int x = 0;
+	int i = 0;
+	int n = data->numberDataPoints();
+	QFontMetrics fm=fontMetrics();
+	int fh = fm.height();
+	int fw;
+
+	QColor c( 0, 0, 255);
+	p.setBrush( c );
+
+	for (DataPointInfo *dp = data->firstDataPoint(); dp; dp = data->nextDataPoint() )
+	{
+		int bw = ( width - width / 4 - x ) / ( n - i );
+		int bh = int( ( height - height / 4 - 1 ) * dp->value() / max );
+		p.drawRect( width / 8 + x, height - height / 8 - 1 - bh, bw, bh );
+		fw = fm.width( dp->label() );
+		p.drawText( width / 8 + x - fw / 2 + bw / 2, height - height / 8, fw,
+					fh + height / 8, AlignTop | AlignHCenter, dp->label() );
+//					WordBreak | AlignTop | AlignHCenter, dp->label() );
+		i++;
+		x += bw;
+	}
 }
 
-void Graph::drawLineChart()
+void Graph::drawLineChart( int width, int height, float max )
 {
 }
 
-void Graph::drawPieChart()
+void Graph::drawPieChart( int width, int height, float sum )
 {
+	QPainter p( &graph );
+
+	// Try to set the font size smaller for text
+	QFont f = font();
+	f.setPointSize( 8 );
+	p.setFont( f );
+
+	int n = data->numberDataPoints();
+
+	int apos = -90 * 16;
+
+	int xd = width - width / 5;
+	int yd = height - height / 5;
+
+	int i = 0;
+
+	QColor c;
+
+	for (DataPointInfo *dp = data->firstDataPoint(); dp; dp = data->nextDataPoint() )
+	{
+		c.setHsv( ( i *255) / n, 255, 255 );
+		p.setBrush( c );
+
+		int a = int( ( dp->value() * 360.0 ) / sum * 16.0 + 0.5 );
+		p.drawPie( width/10, height/10, xd, yd, -apos, -a );
+		apos += a;
+		i++;
+	}
+
+	double apos2 = -90 * 3.14159 / 180;
+	for (DataPointInfo *dp = data->firstDataPoint(); dp; dp = data->nextDataPoint() )
+	{
+		double a = dp->value() *360 / sum * 3.14159 / 180;
+		int x = int( cos( apos2 + a/2 ) * width * 5/16 + width/2 + 0.5 );
+		int y = int( sin( apos2 + a/2 ) * height * 5/16 + height/2 + 0.5 );
+		p.drawText( x - width/8, y - height/8, width/4, height/4, WordBreak | AlignCenter,
+					dp->label() );
+		apos2 += a;
+	}
 }
 
diff --git a/noncore/apps/checkbook/graph.h b/noncore/apps/checkbook/graph.h
index 7379be7..40b23cd 100644
--- a/noncore/apps/checkbook/graph.h
+++ b/noncore/apps/checkbook/graph.h
@@ -32,8 +32,9 @@
 #include <qpixmap.h>
 #include <qwidget.h>
 
 class GraphInfo;
+class QPainter;
 
 class Graph : public QWidget
 {
 	Q_OBJECT
@@ -43,9 +44,9 @@ class Graph : public QWidget
 
 		void setGraphInfo( GraphInfo * );
 
 		void drawGraph( bool = FALSE );
-		
+
 	protected:
 		void paintEvent( QPaintEvent * );
 		void resizeEvent( QResizeEvent * );
 
@@ -54,10 +55,10 @@ class Graph : public QWidget
 
 		QPixmap graph;
 
 		void initGraph();
-		void drawBarChart();
-		void drawLineChart();
-		void drawPieChart();
+		void drawBarChart( int, int, float );
+		void drawLineChart( int, int, float );
+		void drawPieChart( int, int, float );
 };
 
 #endif
diff --git a/noncore/apps/checkbook/graphinfo.cpp b/noncore/apps/checkbook/graphinfo.cpp
index 7b06bdb..ec6a465 100644
--- a/noncore/apps/checkbook/graphinfo.cpp
+++ b/noncore/apps/checkbook/graphinfo.cpp
@@ -37,8 +37,19 @@ GraphInfo::GraphInfo( GraphType type, DataPointList *data, const QString &title,
 	xt = xtitle;
 	yt = ytitle;
 }
 
+GraphInfo::~GraphInfo()
+{
+	if ( d )
+	{
+		for ( DataPointInfo *data = d->first(); data; data = d->next() )
+		{
+			delete data;
+		}
+	}
+}
+
 GraphInfo::GraphType GraphInfo::graphType()
 {
 	return t;
 }
@@ -57,16 +68,44 @@ void GraphInfo::setDataPoints( DataPointList *data )
 {
 	d = data;
 }
 
-float GraphInfo::maxValue()
+DataPointInfo *GraphInfo::firstDataPoint()
 {
-	float max;
+	return( d->first() );
+}
 
+DataPointInfo *GraphInfo::nextDataPoint()
+{
+	return( d->next() );
+}
+
+int GraphInfo::numberDataPoints()
+{
+	return( d->count() );
+}
+
+float GraphInfo::maxValue()
+{
+	float max = 0.0;
+	for ( DataPointInfo *data = d->first(); data; data = d->next() )
+	{
+		if ( data->value() > max )
+		{
+			max = data->value();
+		}
+	}
+	return max;
 }
 
-float GraphInfo::minValue()
+float GraphInfo::totalValue()
 {
+	float sum = 0.0;
+	for ( DataPointInfo *data = d->first(); data; data = d->next() )
+	{
+		sum += data->value();
+	}
+	return sum;
 }
 
 void GraphInfo::setGraphTitle( const QString &title )
 {
diff --git a/noncore/apps/checkbook/graphinfo.h b/noncore/apps/checkbook/graphinfo.h
index 4ad1dc9..620da74 100644
--- a/noncore/apps/checkbook/graphinfo.h
+++ b/noncore/apps/checkbook/graphinfo.h
@@ -41,8 +41,10 @@ class DataPointInfo
 			: l( label ), v( value ) {}
 
 		const QString &label() { return l; }
 		float          value() { return v; }
+		
+		void addToValue( float value ) { v += value; }
 
 	private:
 		QString l;
 		float   v;
@@ -56,17 +58,21 @@ class GraphInfo
 		enum GraphType { BarChart, LineChart, PieChart };
 
 		GraphInfo( GraphType = BarChart, DataPointList * = 0x0,
 				   const QString & = 0x0, const QString & = 0x0, const QString & = 0x0 );
+		~GraphInfo();
 
 		GraphInfo::GraphType graphType();
 		void                 setGraphType( GraphType );
 
 		DataPointList *dataPoints();
 		void           setDataPoints( DataPointList * );
+		DataPointInfo *firstDataPoint();
+		DataPointInfo *nextDataPoint();
+		int            numberDataPoints();
 
 		float maxValue();
-		float minValue();
+		float totalValue();
 
 		void setGraphTitle( const QString & );
 		void setXAxisTitle( const QString & );
 		void setYAxisTitle( const QString & );