Draw a bar chart inisde the QScrollArea

**fullmetalcoder** · 4th March 2007, 17:00

Originally Posted by ultrasonic

Did I forget something that should be handled?

Certainly but I don't remember what exactly...

Try having a look at other scrollable widget or use a cache image instead like this :

cmpaction.h :

Qt Code:

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#ifndef CMPACTION_H
#define CMPACTION_H
 
#include <QImage>
#include <QAbstractScrollArea>
 
class CmpAction : public QAbstractScrollArea
{
    Q_OBJECT
 
public:
    CmpAction(QWidget *parent = 0);
    void openDir(QString dirpath);
 
public slots:
    void setText(const QString &newText) { text = newText; }
 
protected:
    virtual void paintEvent(QPaintEvent *event);
    virtual void resizeEvent(QResizeEvent *event);
 
    void updateGeometries();
    void scrollContentsBy(int dx, int dy);
 
private:
    int ARM[10000];
    int BUS[10000];
    int DWT[10000];
    int TIER1[10000];
    int OFF_CHIP[10000];
    QString text;
    int my_width;
    int my_height;
 
    void init();
    void updateChart();
 
    QImage img;
    bool bDirty;
};
 
#endif

#ifndef CMPACTION_H
#define CMPACTION_H

#include <QImage>
#include <QAbstractScrollArea>

class CmpAction : public QAbstractScrollArea
{
    Q_OBJECT
    
public:
    CmpAction(QWidget *parent = 0);
    void openDir(QString dirpath);
    
public slots:
    void setText(const QString &newText) { text = newText; }
    
protected:
    virtual void paintEvent(QPaintEvent *event);
    virtual void resizeEvent(QResizeEvent *event);
    
    void updateGeometries();
    void scrollContentsBy(int dx, int dy);
    
private:
    int ARM[10000];
    int BUS[10000];
    int DWT[10000];
    int TIER1[10000];
    int OFF_CHIP[10000];
    QString text;
    int my_width;
    int my_height;
    
    void init();
    void updateChart();
    
    QImage img;
    bool bDirty;
};

#endif

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cmpaction.cpp :

Qt Code:

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#include <QtGui>
#include "cmpaction.h"
 
CmpAction::CmpAction(QWidget *parent)
 :    QAbstractScrollArea(parent),
    bDirty(false)
{
    setMinimumSize(800,400);
    my_width=100+10000;
    my_height=400;
    horizontalScrollBar()->setRange(0, my_width-800);
    horizontalScrollBar()->setPageStep(800);
    verticalScrollBar()->setRange(0, my_height-400);
    verticalScrollBar()->setPageStep(400);
 
    //pix = QPixmap(viewport()->size());
    img = QImage(viewport()->size(), QImage::Format_ARGB32);
 
    init();
}
 
 
void CmpAction::init()
{
    for(int i = 0;i<10000;i++) ARM[i] = BUS[i] = DWT[i] =
        TIER1[i] = OFF_CHIP[i] = 0;
}
 
void CmpAction::resizeEvent(QResizeEvent *e)
{
    QAbstractScrollArea::resizeEvent(e);
 
    bDirty = true;
 
    updateGeometries();
}
 
void CmpAction::paintEvent(QPaintEvent *e)
{
    Q_UNUSED(e)
 
    if ( bDirty )
    {
        updateChart();
    }
 
    QPainter p(viewport());
    const int w = width(), h = height();
    const int x = horizontalScrollBar()->value(), y = verticalScrollBar()->value();
 
    //p.drawPixmap(QRect(0, 0, w, h), pix.copy(QRect(x, y, w, h)));
    p.drawImage(QRect(0, 0, w, h), img.copy(QRect(x, y, w, h)));
}
 
 
void CmpAction::scrollContentsBy(int dx, int dy)
{
    viewport()->scroll(dx,dy);
}
 
 
void CmpAction::updateGeometries()
{
    horizontalScrollBar()->setPageStep(viewport()->width());
    verticalScrollBar()->setPageStep(viewport()->height());
    horizontalScrollBar()->setRange(0,qMax(0, my_width-viewport()->width()) );
    verticalScrollBar()->setRange(0, qMax(0, my_height-viewport()->height()) );
}
 
void CmpAction::openDir(QString dirpath)
{
 
    int i=0;
    if(dirpath == NULL)
    dirpath = QFileDialog::getExistingDirectory(this,
            tr("Select File"),
            QString(),
            QFileDialog::ShowDirsOnly | QFileDialog::DontResolveSymlinks);    
 
    qDebug() << dirpath;
 
    QString arm,bus,dwt,t1,offchip;
 
    arm = bus = dwt = t1 = offchip = dirpath;
 
    arm.append(QString("arm_trace"));
    bus.append(QString("bus_trace"));
    dwt.append(QString("dwt_trace"));
    t1.append(QString("t1_trace"));
    offchip.append(QString("mem_trace"));
 
    qDebug() << arm;
    qDebug() << bus;
    qDebug() << dwt;
    qDebug() << t1;
    qDebug() << offchip;
 
 
    QFile f_arm(arm);
    QFile f_bus(bus);
    QFile f_dwt(dwt);
    QFile f_t1(t1);
    QFile f_offchip(offchip);
    QString line;
 
    if(f_arm.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_arm);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                ARM[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
 
    if(f_bus.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_bus);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                BUS[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
 
    if(f_dwt.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_dwt);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                DWT[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
 
    if(f_t1.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_t1);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                TIER1[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
 
    if(f_offchip.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_offchip);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                OFF_CHIP[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
    f_arm.close();
    f_bus.close();
    f_dwt.close();
    f_t1.close();
    f_offchip.close();
 
    bDirty = true;
}
 
/*
QSize CmpAction::sizeHint()
{
    return QSize(800,400);
}*/
 
void CmpAction::updateChart()
{
    qDebug("painting");
 
    QPainter painter(&img);
    //QPainter painter(&pix);
 
    int i=10000;
 
    const int start = 100;
    const int act_unit_w = 1;
    const int act_unit_h = 10;
 
    QFontMetrics metrics(font());
    QColor color;
 
    QBrush Brush1(Qt::red,Qt::SolidPattern);
    QBrush Brush2(Qt::green,Qt::SolidPattern);
    QBrush Brush3(Qt::yellow,Qt::SolidPattern);
    QBrush Brush4(Qt::blue,Qt::SolidPattern);
    QBrush badBrush(Qt::black,Qt::SolidPattern);
 
    for(int j=0;j<i;j++){    
        if(ARM[j]==1)
        {
            painter.fillRect(start+j*act_unit_w,100,act_unit_w,act_unit_h,Brush1);
        }
 
        if(BUS[j]==1)
        {
            painter.fillRect(start+j*act_unit_w,150,act_unit_w,act_unit_h,Brush2);
        }
        if(DWT[j]==1)
        {
            painter.fillRect(start+j*act_unit_w,200,act_unit_w,act_unit_h,Brush3);
        }
        if(TIER1[j]==1)
        {
            painter.fillRect(start+j*act_unit_w,250,act_unit_w,act_unit_h,Brush4);
        }
        if(OFF_CHIP[j]==1) 
        {
            painter.fillRect(start+j*act_unit_w,300,act_unit_w,act_unit_h,badBrush);
        }
    }
 
    painter.save();
    painter.setBrush(badBrush);
    painter.setPen(QColor(Qt::black));
 
    for( int j=start; j< 10000+start ; j += act_unit_w*100 ){
        painter.drawLine(j,400,j,395);    
        painter.drawText(j,420,QString::number(j-start,10));
    }
    painter.drawText(0,100+30,QString("ARM"));
    painter.drawText(0,150+30,QString("BUS"));
    painter.drawText(0,200+30,QString("DWT"));
    painter.drawText(0,250+30,QString("TIER1"));
    painter.drawText(0,300+30,QString("MEMORY"));
    painter.drawText(0,0,640,50,Qt::AlignCenter,QString("Bus Activation Graph"));
    painter.drawLine(start,75,start,400);    
    painter.drawLine(start,400,10000,400);    
 
    painter.restore();
 
    //pix.save("chart.png");
    img.save("chart.png");
    bDirty = false;
}

#include <QtGui>
#include "cmpaction.h"

CmpAction::CmpAction(QWidget *parent)
 :    QAbstractScrollArea(parent),
    bDirty(false)
{
    setMinimumSize(800,400);
    my_width=100+10000;
    my_height=400;
    horizontalScrollBar()->setRange(0, my_width-800);
    horizontalScrollBar()->setPageStep(800);
    verticalScrollBar()->setRange(0, my_height-400);
    verticalScrollBar()->setPageStep(400);
    
    //pix = QPixmap(viewport()->size());
    img = QImage(viewport()->size(), QImage::Format_ARGB32);
    
    init();
}
    

void CmpAction::init()
{
    for(int i = 0;i<10000;i++) ARM[i] = BUS[i] = DWT[i] =
        TIER1[i] = OFF_CHIP[i] = 0;
}

void CmpAction::resizeEvent(QResizeEvent *e)
{
    QAbstractScrollArea::resizeEvent(e);
    
    bDirty = true;
    
    updateGeometries();
}

void CmpAction::paintEvent(QPaintEvent *e)
{
    Q_UNUSED(e)
    
    if ( bDirty )
    {
        updateChart();
    }
    
    QPainter p(viewport());
    const int w = width(), h = height();
    const int x = horizontalScrollBar()->value(), y = verticalScrollBar()->value();
    
    //p.drawPixmap(QRect(0, 0, w, h), pix.copy(QRect(x, y, w, h)));
    p.drawImage(QRect(0, 0, w, h), img.copy(QRect(x, y, w, h)));
}


void CmpAction::scrollContentsBy(int dx, int dy)
{
    viewport()->scroll(dx,dy);
}


void CmpAction::updateGeometries()
{
    horizontalScrollBar()->setPageStep(viewport()->width());
    verticalScrollBar()->setPageStep(viewport()->height());
    horizontalScrollBar()->setRange(0,qMax(0, my_width-viewport()->width()) );
    verticalScrollBar()->setRange(0, qMax(0, my_height-viewport()->height()) );
}

void CmpAction::openDir(QString dirpath)
{
   
    int i=0;
    if(dirpath == NULL)
    dirpath = QFileDialog::getExistingDirectory(this,
            tr("Select File"),
            QString(),
            QFileDialog::ShowDirsOnly | QFileDialog::DontResolveSymlinks);    

    qDebug() << dirpath;
    
    QString arm,bus,dwt,t1,offchip;

    arm = bus = dwt = t1 = offchip = dirpath;

    arm.append(QString("arm_trace"));
    bus.append(QString("bus_trace"));
    dwt.append(QString("dwt_trace"));
    t1.append(QString("t1_trace"));
    offchip.append(QString("mem_trace"));

    qDebug() << arm;
    qDebug() << bus;
    qDebug() << dwt;
    qDebug() << t1;
    qDebug() << offchip;

    
    QFile f_arm(arm);
    QFile f_bus(bus);
    QFile f_dwt(dwt);
    QFile f_t1(t1);
    QFile f_offchip(offchip);
    QString line;
    
    if(f_arm.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_arm);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                ARM[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
    
    if(f_bus.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_bus);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                BUS[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
    
    if(f_dwt.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_dwt);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                DWT[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
    
    if(f_t1.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_t1);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                TIER1[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
    
    if(f_offchip.open(QFile::ReadOnly | QFile::Text))
    {
        QTextStream stream(&f_offchip);
        line = stream.readLine(0);
        i=0;
        while(!line.isEmpty())
        {
            if (line == "1")
            {
                OFF_CHIP[i]=1;
            }
            i++;
            line = stream.readLine(0);
        }
    }
    f_arm.close();
    f_bus.close();
    f_dwt.close();
    f_t1.close();
    f_offchip.close();

    bDirty = true;
}

/*
QSize CmpAction::sizeHint()
{
    return QSize(800,400);
}*/

void CmpAction::updateChart()
{
    qDebug("painting");
    
    QPainter painter(&img);
    //QPainter painter(&pix);
    
    int i=10000;
    
    const int start = 100;
    const int act_unit_w = 1;
    const int act_unit_h = 10;
    
    QFontMetrics metrics(font());
    QColor color;

    QBrush Brush1(Qt::red,Qt::SolidPattern);
    QBrush Brush2(Qt::green,Qt::SolidPattern);
    QBrush Brush3(Qt::yellow,Qt::SolidPattern);
    QBrush Brush4(Qt::blue,Qt::SolidPattern);
    QBrush badBrush(Qt::black,Qt::SolidPattern);
    
    for(int j=0;j<i;j++){    
        if(ARM[j]==1)
        {
            painter.fillRect(start+j*act_unit_w,100,act_unit_w,act_unit_h,Brush1);
        }
        
        if(BUS[j]==1)
        {
            painter.fillRect(start+j*act_unit_w,150,act_unit_w,act_unit_h,Brush2);
        }
        if(DWT[j]==1)
        {
            painter.fillRect(start+j*act_unit_w,200,act_unit_w,act_unit_h,Brush3);
        }
        if(TIER1[j]==1)
        {
            painter.fillRect(start+j*act_unit_w,250,act_unit_w,act_unit_h,Brush4);
        }
        if(OFF_CHIP[j]==1) 
        {
            painter.fillRect(start+j*act_unit_w,300,act_unit_w,act_unit_h,badBrush);
        }
    }

    painter.save();
    painter.setBrush(badBrush);
    painter.setPen(QColor(Qt::black));

    for( int j=start; j< 10000+start ; j += act_unit_w*100 ){
        painter.drawLine(j,400,j,395);    
        painter.drawText(j,420,QString::number(j-start,10));
    }
    painter.drawText(0,100+30,QString("ARM"));
    painter.drawText(0,150+30,QString("BUS"));
    painter.drawText(0,200+30,QString("DWT"));
    painter.drawText(0,250+30,QString("TIER1"));
    painter.drawText(0,300+30,QString("MEMORY"));
    painter.drawText(0,0,640,50,Qt::AlignCenter,QString("Bus Activation Graph"));
    painter.drawLine(start,75,start,400);    
    painter.drawLine(start,400,10000,400);    

    painter.restore();
    
    //pix.save("chart.png");
    img.save("chart.png");
    bDirty = false;
}

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P.S : It is recommended not to include the QtGui file unless you need so many classes that it become too long to write all includes

because it slows down the compilation a great deal...

P.S(2) : I've not been able to try this code with real data so you may need to fix/improve the drawing of the chart...

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Re: Draw a bar chart inisde the QScrollArea

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