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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 <QGraphicsScene>
#include <QDebug>
#include "databasetable.h"
#include "databaserelationship.h"
#include "range.h"
DatabaseRelationship::DatabaseRelationship(DiagramItem *parent)
: DiagramConnection(parent)
{
setFlag(ItemIsSelectable);
connect(this, SIGNAL(endPointChanged()), this, SLOT(updateLayout()));
}
QRectF
DatabaseRelationship::boundingRect() const
{
return shape().boundingRect();
}
QPainterPath
DatabaseRelationship::shape() const
{
QPainterPath path;
if (m_line.isEmpty())
return path;
path.moveTo(m_line[0]);
for (int i = 1; i < m_line.size(); i++)
path.lineTo(m_line[i]);
path.addPolygon(m_arrowHead);
QPen pen(QPen(QColor(0, 0, 0), 1));
pen.setJoinStyle(Qt::MiterJoin);
QPainterPathStroker ps;
ps.setCapStyle(pen.capStyle());
ps.setWidth(pen.widthF() + 0.3);
ps.setJoinStyle(pen.joinStyle());
ps.setMiterLimit(pen.miterLimit());
return ps.createStroke(path);
}
void
DatabaseRelationship::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
Q_UNUSED(option);
Q_UNUSED(widget);
QPen pen(QPen(QColor(0, 0, 0), 1));
pen.setJoinStyle(Qt::MiterJoin);
painter->setPen(pen);
painter->drawPolyline(m_line);
painter->setBrush(pen.color());
painter->drawPolygon(m_arrowHead);
}
QVariant
DatabaseRelationship::itemChange(GraphicsItemChange change, const QVariant &value)
{
if (change == ItemSceneHasChanged) {
updateLayout();
}
return QGraphicsItem::itemChange(change, value);
}
void
DatabaseRelationship::updatePositions()
{
updateLayout();
update();
}
void
DatabaseRelationship::updateLayout()
{
if (!scene())
return;
DatabaseTable *source = sourceTable();
DatabaseTable *target = targetTable();
if (!source || !target)
return;
prepareGeometryChange();
QRectF rect1 = source->boundingRect().translated(source->pos());
QRectF rect2 = target->boundingRect().translated(target->pos());
bool haveLine = false;
Range<qreal> verticalRange1(rect1.top(), rect1.bottom());
Range<qreal> verticalRange2(rect2.top(), rect2.bottom());
Range<qreal> verticalIntersection = verticalRange1.intersected(verticalRange2);
Range<qreal> horizontalRange1(rect1.left(), rect1.right());
Range<qreal> horizontalRange2(rect2.left(), rect2.right());
Range<qreal> horizontalIntersection = horizontalRange1.intersected(horizontalRange2);
// Straight horizontal line
if (0 && !haveLine) {
if (!verticalIntersection.isNull() && horizontalIntersection.isNull()) {
qreal y = verticalIntersection.min() + verticalIntersection.length() / 2;
if (rect1.right() < rect2.left()) {
m_line = QPolygonF() << QPointF(rect1.right(), y) << QPointF(rect2.left(), y);
}
else {
m_line = QPolygonF() << QPointF(rect1.left(), y) << QPointF(rect2.right(), y);
}
haveLine = true;
}
}
// Straight vertical line
if (0 && !haveLine) {
if (verticalIntersection.isNull() && !horizontalIntersection.isNull()) {
qreal x = horizontalIntersection.min() + horizontalIntersection.length() / 2;
if (rect1.bottom() < rect2.top()) {
m_line = QPolygonF() << QPointF(x, rect1.bottom()) << QPointF(x, rect2.top());
}
else {
m_line = QPolygonF() << QPointF(x, rect1.top()) << QPointF(x, rect2.bottom());
}
haveLine = true;
}
}
// Two-segment line
if (0 && !haveLine) {
qreal x1, x2, x3, y1, y2, y3;
if (rect1.right() < rect2.left()) {
x1 = rect1.right();
y1 = verticalRange1.center();
x2 = horizontalRange2.center();
y2 = verticalRange1.center();
if (rect1.bottom() < rect2.top()) {
x3 = horizontalRange2.center();
y3 = rect2.top();
}
else {
x3 = horizontalRange2.center();
y3 = rect2.bottom();
}
}
else {
x1 = rect1.left();
y1 = verticalRange1.center();
x2 = horizontalRange2.center();
y2 = verticalRange1.center();
if (rect1.bottom() < rect2.top()) {
x3 = horizontalRange2.center();
y3 = rect2.top();
}
else {
x3 = horizontalRange2.center();
y3 = rect2.bottom();
}
}
m_line = QPolygonF()
<< QPointF(x1, y1)
<< QPointF(x2, y2)
<< QPointF(x3, y3);
haveLine = true;
}
// Simple center<->center line
if (!haveLine) {
QPointF p1 = rect1.center();
QPointF p2 = rect2.center();
QLineF finalLine = QLineF(p1, p2);
QPolygonF polygon;
polygon = rect1;
for (int i = 0; i < 4; i++) {
QLineF line(polygon[i], polygon[(i+1)%4]);
QPointF intersectionPoint;
if (finalLine.intersect(line, &intersectionPoint) == QLineF::BoundedIntersection) {
finalLine.setP1(intersectionPoint);
break;
}
}
polygon = rect2;
for (int i = 0; i < 4; i++) {
QLineF line(polygon[i], polygon[(i+1)%4]);
QPointF intersectionPoint;
if (finalLine.intersect(line, &intersectionPoint) == QLineF::BoundedIntersection) {
finalLine.setP2(intersectionPoint);
break;
}
}
m_line = QPolygonF() << finalLine.p1() << finalLine.p2();
haveLine = true;
}
Q_ASSERT(haveLine);
int size = m_line.size();
QLineF lastSegment(m_line[size-2], m_line[size-1]);
m_arrowHead.resize(3);
m_arrowHead[0] = QPointF(0.0, 0.0);
m_arrowHead[1] = QPointF(-4.5, 10.0);
m_arrowHead[2] = QPointF(4.5, 10.0);
QMatrix matrix;
matrix.rotate(-lastSegment.angle() + 90);
m_arrowHead = matrix.map(m_arrowHead);
m_arrowHead.translate(lastSegment.p2());
}
#include "domutils.h"
void
DatabaseRelationship::loadFromXml(QDomElement element, DiagramDocument *document)
{
DiagramConnection::loadFromXml(element, document);
}
void
DatabaseRelationship::saveToXml(QDomDocument doc, QDomElement element)
{
DiagramConnection::saveToXml(doc, element);
}
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