C++ gui help

king_of_inismac

Hey,

I'm porting some code over from matlab to c++

Been 6 years since I did any c++. The main code's working but I need some sort of a gui to display a 100x100 array.

I'd like a 2D image of the array. If array[j] = 1, the pixel should be black, or if array[j] = 0, the pixel in the 100x100 image should be white.

These values change all the time so the image needs to be continually updated.

It's easy in matlab, but I've no idea how to do this in c++

Any ideas?

M

Void

Sry if this isn't the answer you want but....

Don't use C++ to do GUI stuff. Much easier to do it in C# or java or whatever. If you are gonna start on about "c++ performance", then put your maths intensive stuff in a DLL and link to it from C# GUI. Very very easy to do using CLR (can even embed c++ class inside c# app).

Oh, and if you don't want to use Win32 at all, then try GUI in Java? As last resort, use some gui library like tcl inside your C++ app. Whatever you do...... do NOT even think of using MFC (will scar you for life).

Void

However upon reflection it seems that you want a graphics library, not a full gui system. Try this: http://www.libsdl.org/download-1.2.php, or you could use OpenGL or DirectX as well.

Webmonkey

Void wrote: »

Sry if this isn't the answer you want but....

Don't use C++ to do GUI stuff. Much easier to do it in C# or java or whatever. If you are gonna start on about "c++ performance", then put your maths intensive stuff in a DLL and link to it from C# GUI. Very very easy to do using CLR (can even embed c++ class inside c# app).

Oh, and if you don't want to use Win32 at all, then try GUI in Java? As last resort, use some gui library like tcl inside your C++ app. Whatever you do...... do NOT even think of using MFC (will scar you for life).

Not necessarily. QT is a great GUI tool kit for C++ and is quick, very simple and feature packed and cross platform compatible. However, for this - it may be an overkill.

ressem

+1 for QT.

Hardly overkill. To draw you can use the QImage class for one.

//customwidget.h
#ifndef CUSTOMWIDGET_H
#define CUSTOMWIDGET_H

#include <QWidget>

class CustomWidget : public QWidget
{
public:
    CustomWidget();
    void paintEvent(QPaintEvent *event);
};

#endif // CUSTOMWIDGET_H 

#include "customwidget.h"
//customwidget.cpp
#include "Qpainter.h"

CustomWidget::CustomWidget()
{
}

void CustomWidget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
// Draw a 3 by 3 array.
 QImage image(3, 3, QImage::Format_RGB32);
 QRgb colourA,colourB,colourZ;

//Use these colours
 colourA = qRgb(189, 149, 39); // 0xffbd9527
 colourB = qRgb(122, 163, 39); // 0xff7aa327
 colourZ = qRgb(237, 187, 51); // 0xffedba31

// Set the colour of each pixel. Put in a loop for your case
 image.setPixel(0, 0, colourZ);
 image.setPixel(0, 1, colourZ);
 image.setPixel(0, 2, colourB);
 image.setPixel(1, 0, colourA);
 image.setPixel(1, 1, colourB);
 image.setPixel(1, 2, colourA);
 image.setPixel(2, 0, colourB);
 image.setPixel(2, 1, colourB);
 image.setPixel(2, 2, colourA);

// Scale up the image to a viewable 400 x 400 size.
 image = image.scaled(400,400,Qt::KeepAspectRatio,Qt::FastTransformation);
    painter.drawImage( QPoint(10,10),image);

}

//Main.Cpp

#include <QtGui/QApplication>
#include "customwidget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    CustomWidget w;
    w.show();
    return a.exec();
}

fasty

An alternative would be SDL. You can easily set pixels on a surface using it.