Little issue when trying to use a value as a function

[Badeand]

Hi, I am sorry if this is a very noobish question but I have tried to create a speed-o-meter from the clock example posted somewhere on this site.

This is my code so far in that class:

#include <QtGui>
#include "graphview.h"
#include "mainwindow.h"
#include "paramwidget.h"
#include "connectbar.h"
#include "mapwidget.h"
#include "speedometer.h"
 
 
 
SpeedoMeter::SpeedoMeter(QWidget *parent)
    : QWidget(parent), mdir("messages.txt")
{
 
 
 
//    QTimer *timer = new QTimer(this);
//    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
//    timer->start(1000);
 
    setWindowTitle(tr("Speed-O-Meter"));
    resize(200, 200);
}
 
void SpeedoMeter::paintEvent(QPaintEvent *)
{
 
 
    GraphView*   velocity = new GraphView(mdir.getMsgInfo("VELOCITY"), mdir.getMsgInfo("UTC"));
    //float velocity = _minfo->getFloat(msg);
 
 
 
 
 
 
    static const QPoint hourHand[3] = {
        QPoint(7, 8),
        QPoint(-7, 8),
        QPoint(0, -40)
    };
//    static const QPoint minuteHand[3] = {
//        QPoint(7, 8),
//        QPoint(-7, 8),
//        QPoint(0, -70)
//    };
 
    QColor hourColor(0, 191, 255);
//    QColor minuteColor(0, 127, 127, 191);
 
    int side = qMin(width(), height());
   // QTime time = QTime::currentTime();
 
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.translate(width() / 2, height() / 2);
    painter.scale(side / 200.0, side / 200.0);
 
    painter.setPen(Qt::NoPen);
    painter.setBrush(hourColor);
 
    painter.save();
    painter.rotate(12.0 * ((velocity(0))));
    painter.drawConvexPolygon(hourHand, 3);
    painter.restore();
 
    painter.setPen(hourColor);
 
    for (int i = 0; i < 12; ++i) {
        painter.drawLine(88, 0, 96, 0);
        painter.rotate(30.0);
    }
 
    //painter.setPen(Qt::NoPen);
    //painter.setBrush(minuteColor);
 
    //painter.save();
   // painter.rotate(6.0 * (time.minute() + time.second() / 60.0));
    //painter.drawConvexPolygon(minuteHand, 3);
    //painter.restore();
 
    //painter.setPen(minuteColor);
 
   // for (int j = 0; j < 60; ++j) {
       // if ((j % 5) != 0)
         //   painter.drawLine(92, 0, 96, 0);
        //painter.rotate(6.0);
    //}
}

#include <QtGui>
#include "graphview.h"
#include "mainwindow.h"
#include "paramwidget.h"
#include "connectbar.h"
#include "mapwidget.h"
#include "speedometer.h"



SpeedoMeter::SpeedoMeter(QWidget *parent)
    : QWidget(parent), mdir("messages.txt")
{



//    QTimer *timer = new QTimer(this);
//    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
//    timer->start(1000);

    setWindowTitle(tr("Speed-O-Meter"));
    resize(200, 200);
}

void SpeedoMeter::paintEvent(QPaintEvent *)
{
    

    GraphView*   velocity = new GraphView(mdir.getMsgInfo("VELOCITY"), mdir.getMsgInfo("UTC"));
    //float velocity = _minfo->getFloat(msg);



    


    static const QPoint hourHand[3] = {
        QPoint(7, 8),
        QPoint(-7, 8),
        QPoint(0, -40)
    };
//    static const QPoint minuteHand[3] = {
//        QPoint(7, 8),
//        QPoint(-7, 8),
//        QPoint(0, -70)
//    };

    QColor hourColor(0, 191, 255);
//    QColor minuteColor(0, 127, 127, 191);

    int side = qMin(width(), height());
   // QTime time = QTime::currentTime();

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.translate(width() / 2, height() / 2);
    painter.scale(side / 200.0, side / 200.0);

    painter.setPen(Qt::NoPen);
    painter.setBrush(hourColor);

    painter.save();
    painter.rotate(12.0 * ((velocity(0))));
    painter.drawConvexPolygon(hourHand, 3);
    painter.restore();

    painter.setPen(hourColor);

    for (int i = 0; i < 12; ++i) {
        painter.drawLine(88, 0, 96, 0);
        painter.rotate(30.0);
    }

    //painter.setPen(Qt::NoPen);
    //painter.setBrush(minuteColor);

    //painter.save();
   // painter.rotate(6.0 * (time.minute() + time.second() / 60.0));
    //painter.drawConvexPolygon(minuteHand, 3);
    //painter.restore();

    //painter.setPen(minuteColor);

   // for (int j = 0; j < 60; ++j) {
       // if ((j % 5) != 0)
         //   painter.drawLine(92, 0, 96, 0);
        //painter.rotate(6.0);
    //}
}

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I get the following error when I try to run it 'velocity' cannot be used as a function.
but thats exactly what I want, the line

GraphView*   velocity = new GraphView(mdir.getMsgInfo("VELOCITY"), mdir.getMsgInfo("UTC"));

GraphView*   velocity = new GraphView(mdir.getMsgInfo("VELOCITY"), mdir.getMsgInfo("UTC"));

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is used in one of my other classes to decleare a widget and then I place the widget out on my main windows and I get a value from it (speed), this value I want to use in my speedometer so that it looks like a cool analog speedometer and not just the value.

any sugestions?

thanks.

[Lesiok]

Line 63 :

painter.rotate(12.0 * ((velocity(0))));

painter.rotate(12.0 * ((velocity(0))));

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what do You want to do ???

[ChrisW67]

The needle on the dial should be rotated by some amount proportional to the velocity before being drawn. Commented line 30 with its float velocity looks like a better, though not correct, fit to line 63. The constant 12.0 is coming from the 12-hour clock this was cut-n-pasted from.

[Badeand]

Hi,
I think I am giving upp on that project since it might be that the vehicle goes a bit to fast for a 360 degrees visualization, but now I want to make this code to be a roll meter instead, to see if the vehicle is horizontal or in a roll, if you know what I mean, like in flightsimulator =) (----) or (not horizontal line).