editing a image using QT

[qtlearner123]

Hi all,

i have this doubt if i have an image in my computer and i access that image (.jpeg or anyother format) using QT program and after accessing the image is it possible for me to edit the image using QT program? i.e can i modify the image as per my needs dynamically is it possible??

thanks in advance,

regards,
satya

[wysota]

You can access each pixel of the image using QImage API.

[qtlearner123]

hi,

thank you very much for the reply, i am going through the documentation of QImage, but i have one small question suppose i have one image say image1 and i want to remove some part of the image1 and replace it with another image2 can i achieve the task it, based upon your feedback i can make sure i am not going in the wrong direction.

thanks and regards,
satya

[wysota]

You have to open a painter on the image and use QPainter::drawImage() to draw the part that is to replace old content.

[qtlearner123]

you are so precise and to the point.

thanks and regards,
satya

[qtlearner123]

Hi,

iam trying to take image1 and on image1 at some portion i want to overwrite image2, i did with the following code.



#include <QtGui/QApplication>
#include <QLabel>
#include <QGraphicsView>
#include <stdio.h>
#include <QRect>
#include <QPainter>
#include "lines1.h"

QImage firstImage;
QImage secondImage;

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Lines window;

firstImage.load(":/images/myImage1.png");
secondImage.load(":/images/myImage2.png");
window.show();
return a.exec();
}


void Lines::paintEvent(QPaintEvent *event)
{
QPainter painter(this);

QRect rect1,rect2;
rect1.setX(0);
rect1.setY(0);
rect1.setHeight(600);
rect1.setWidth(700);

rect2.setX(500);
rect2.setY(200);
rect2.setHeight(50);
rect2.setWidth(50);


painter.drawImage(rect1, firstImage);
painter.drawImage(rect2,secondImage);
}


my questions are
1. Is it the correct way of doing it or any better method is available to achieve the same?
2. suppose i want to overwrite at a particular part of image how to know the coordinates of those points? right now i am using trial and error method?

thanks in advance,

regards,
satya