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// Copyright (C) 2008 Lukas Lalinsky
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#include <cmath>
#include <QMouseEvent>
#include <QScrollBar>
#include <QDebug>
#include "diagramview.h"
#include "diagramdocument.h"
using namespace std;
DiagramView::DiagramView(QWidget *parent)
: QGraphicsView(parent), m_handScrolling(false)
{
setAlignment(Qt::AlignLeft | Qt::AlignTop);
setRenderHint(QPainter::Antialiasing);
setDragMode(QGraphicsView::RubberBandDrag);
setRubberBandSelectionMode(Qt::ContainsItemBoundingRect);
}
DiagramDocument *
DiagramView::document() const
{
return static_cast<DiagramDocument *>(scene());
}
void
DiagramView::setScene(QGraphicsScene *scene)
{
QGraphicsView::setScene(scene);
updateSceneRect2(scene->sceneRect());
connect(scene, SIGNAL(sceneRectChanged(const QRectF &)), SLOT(updateSceneRect2(const QRectF &)));
}
void
DiagramView::updateSceneRect2(const QRectF &rect)
{
QRectF sceneRect = rect.united(QRectF(QPointF(0, 0), QPointF(100, 100)));
setSceneRect(sceneRect);
}
void
DiagramView::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::MidButton) {
m_handScrolling = true;
m_handScrollingOrigin = QPoint(event->pos());
m_handScrollingValueX = horizontalScrollBar()->value();
m_handScrollingValueY = verticalScrollBar()->value();
m_savedCursor = viewport()->cursor();
viewport()->setCursor(Qt::ClosedHandCursor);
event->accept();
return;
}
QGraphicsView::mousePressEvent(event);
}
void
DiagramView::mouseMoveEvent(QMouseEvent *event)
{
if (m_handScrolling) {
QPoint delta = event->pos() - m_handScrollingOrigin;
horizontalScrollBar()->setValue(m_handScrollingValueX - delta.x());
verticalScrollBar()->setValue(m_handScrollingValueY - delta.y());
event->accept();
return;
}
QGraphicsView::mouseMoveEvent(event);
}
void
DiagramView::mouseReleaseEvent(QMouseEvent *event)
{
if (m_handScrolling) {
m_handScrolling = false;
viewport()->setCursor(m_savedCursor);
event->accept();
return;
}
QGraphicsView::mouseReleaseEvent(event);
}
void
DiagramView::drawBackground(QPainter *painter, const QRectF &rect)
{
DiagramDocument *doc = document();
if (doc && doc->isGridVisible()) {
drawGrid(painter, rect);
}
}
void
DiagramView::drawGrid(QPainter *painter, const QRectF &rect)
{
const int pointBufferSize = 5000;
static QPoint pointBuffer[pointBufferSize];
DiagramDocument *doc = document();
int gridSize = doc->gridSize();
int x0 = gridSize * floor(rect.left() / gridSize);
int y0 = gridSize * floor(rect.top() / gridSize);
int x1 = gridSize * ceil(rect.right() / gridSize);
int y1 = gridSize * ceil(rect.bottom() / gridSize);
painter->save();
QPen pen;
pen.setColor(doc->gridColor());
pen.setWidth(0);
painter->setPen(pen);
painter->setRenderHint(QPainter::Antialiasing, false);
int pointsUsed = 0;
for (int x = x0; x < x1; x += gridSize) {
for (int y = y0; y < y1; y += gridSize) {
pointBuffer[pointsUsed].setX(x);
pointBuffer[pointsUsed].setY(y);
pointsUsed++;
if (pointsUsed == pointBufferSize) {
painter->drawPoints(pointBuffer, pointsUsed);
pointsUsed = 0;
}
}
}
if (pointsUsed > 0) {
painter->drawPoints(pointBuffer, pointsUsed);
pointsUsed = 0;
}
painter->restore();
}
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