canvaswidget.cpp

#include "canvaswidget.h"

CanvasWidget::CanvasWidget(QWidget *parent):

QWidget(parent), selected(NULL), creating(false)

{

}

CanvasWidget::~ CanvasWidget ()

{

for (unsigned i = 0; i < shapes.size(); ++i)

{

delete shapes[i];

}

}

void CanvasWidget:: mousePressEvent (QMouseEvent * event)

{

pressedPoint[X] = event->localPos().x();

pressedPoint[Y] = event->localPos().y();

if (selected) selected-> select (false);

selected = NULL;

unsigned i = shapes.size();

for (; i > 0; --i)

{

if (shapes[i - 1]->belongs(pressedPoint))

{

selected = shapes[i - 1];

pressedPoint -= selected-> getCenter ();

selected-> select (true);

break;

}

}

update();

}

void CanvasWidget:: mouseMoveEvent (QMouseEvent * event)

{

if ((event->buttons()) & Qt::LeftButton)

{

Vector2D currentPoint;

currentPoint[X] = event->localPos().x();

currentPoint[Y] = event->localPos().y();

if (creating)

{

shapes.back()->setBounds(pressedPoint, currentPoint);

}

else if (selected)

{

selected-> move (currentPoint - pressedPoint);

}

else

{

creating = true;

selected = new QtRectangle(pressedPoint, pressedPoint);

shapes.push_back(selected);

selected-> select (true);

}

update();

}

}

void CanvasWidget:: mouseReleaseEvent (QMouseEvent *)

{

if (creating)

{

creating = false;

}

}

void CanvasWidget:: paintEvent (QPaintEvent *)

{

QPainter painter(this);

for (unsigned i = 0; i < shapes.size(); ++i)

{

shapes[i]->draw(painter);

}

}