[SOLVED] Digitising (GIS)

PrathibaVishnu

Hi,

I'am new to Qt. The task may be simple but am not getting it. Can any one help me to develop points on MousePressEvent and to develop a straight line between two consecutive points.

AcerExtensa

Here you go:

widget.h:
@
#ifndef WIDGET_H
#define WIDGET_H

#include <QtGui/QWidget>
#include <QPaintEvent>
#include <QMouseEvent>
#include <QLine>
#include <QPoint>
#include <QVector>

class Widget : public QWidget
{
Q_OBJECT

public:
Widget(QWidget *parent = 0);

private:
QVector<QLine> lines;
QPoint last;

protected:
void paintEvent(QPaintEvent *);
void mousePressEvent(QMouseEvent *);
};

#endif // WIDGET_H
@

widget.cpp:
@
#include "widget.h"
#include <QPainter>

Widget::Widget(QWidget *parent):QWidget(parent)
{
this->last = QPoint(-1,-1);
}

void Widget::paintEvent(QPaintEvent * e)
{
QPainter painter(this);
painter.fillRect(this->rect(), Qt::white);
painter.setPen(Qt::black);
if(this->lines.count() == 0)return;

painter.drawLines(this->lines);

}

void Widget::mousePressEvent(QMouseEvent * e)
{
if(this->last.x() < 0 && this->last.y() < 0)
{
this->lines << QLine(e->pos(), e->pos());
}
else this->lines << QLine(this->last, e->pos());
this->last = e->pos();
this->update();
}
@

AcerExtensa

Please add "[SOLVED]" left to the topic subject if your problem is solved. Thank!

PrathibaVishnu

The code was really helpful. Is there any possibility to integrate the code mentioned in the link http://www.dazzle.plus.com/linux/QtCreator/part13.htm with the above mentioned code?

andre

Come on. You got really good help: ready made code for you to play with. You can't expect others on this forum to do your work for you of integrating that into your project. If you're looking for that kind of help, please go look for a consultant instead.