I have made this program which is a basic paint application, I’m trying to edit it now so when the mouse is clicked, a point(like a point on a graph) is made at the spot where the mouse has been clicked and after 3 or 4 points are made they are connected using a line. I’m struggling with the initial bit at the moment just getting the program to create a point on mouse press is proving difficult, any help would be appreciated. Here is my working version of the paint app.
header file
#ifndef LINE_WIDGET
#define LINE_WIDGET
#include <QWidget>
#include <QtGui>
#define PIXEL_POINTS 100000
#define PAGE_WIDTH 0
#define PAGE_HEIGHT 0
//Class
class lineWidget : public QWidget
{
Q_OBJECT
public:
//model
QImage *theImage = new QImage(10000, 10000, QImage::Format_RGB32);
lineWidget(QWidget* parent = 0);
//routines
void mousePressEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void paintEvent(QPaintEvent *event);
private:
int gx[PIXEL_POINTS], gy[PIXEL_POINTS];
int gi;
};
#endif // LINE_WIDGET
cpp file
#include <QtGui>
#include "lineWidget.h"
lineWidget::lineWidget(QWidget *parent):
QWidget(parent)
{
gi=0;
//set the image to white
QColor whiteColour(255, 255, 255);
theImage->fill(whiteColour.rgba());
}
void lineWidget::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
//set image to screen
QPointF imageOrigin(0.0, 0.0);
painter.drawImage(imageOrigin, *theImage);
int i;
painter.setPen(QPen(Qt::black, 5 ));
for ( i = 0 ; i < gi-1 ; ++ i ){
if ( gy[i] > PAGE_WIDTH + PAGE_HEIGHT )
painter.drawPoint(QPointF( gx[i], gy[i]));
}
}
void lineWidget::mouseMoveEvent( QMouseEvent *event){
gx[gi] = (event->x());
gy[gi] = (event->y());
if ( gi < PIXEL_POINTS - 1)
++gi;
repaint();
}
void lineWidget::mousePressEvent(QMouseEvent *event) {
gx[gi] = (event->x());
gy[gi] = (event->y());
}
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