1 /***************************************************************************
2 * Copyright (C) 2010 by Till Theato (root@ttill.de) *
4 * This program is free software; you can redistribute it and/or modify *
5 * it under the terms of the GNU General Public License as published by *
6 * the Free Software Foundation; either version 2 of the License, or *
7 * (at your option) any later version. *
9 * This program is distributed in the hope that it will be useful, *
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
12 * GNU General Public License for more details. *
14 * You should have received a copy of the GNU General Public License *
15 * along with this program; if not, write to the *
16 * Free Software Foundation, Inc., *
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
18 ***************************************************************************/
20 #include "onmonitorcornersitem.h"
21 #include "kdenlivesettings.h"
25 #include <QGraphicsSceneMouseEvent>
27 #include <QStyleOptionGraphicsItem>
30 OnMonitorCornersItem::OnMonitorCornersItem(MonitorScene* scene, QGraphicsItem* parent) :
31 AbstractOnMonitorItem(scene),
32 QGraphicsPolygonItem(parent),
35 setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);
37 QPen framepen(Qt::SolidLine);
38 framepen.setColor(Qt::yellow);
40 setBrush(Qt::NoBrush);
43 OnMonitorCornersItem::cornersActions OnMonitorCornersItem::getMode(QPointF pos, int *corner)
46 if (polygon().count() != 4)
49 QPainterPath mouseArea;
50 pos = mapFromScene(pos);
51 mouseArea.addRect(pos.x() - 6, pos.y() - 6, 12, 12);
52 for (int i = 0; i < 4; ++i) {
53 if (mouseArea.contains(polygon().at(i))) {
58 if (KdenliveSettings::onmonitoreffects_cornersshowcontrols()) {
59 if (mouseArea.contains(getCentroid()))
63 for (int i = 0; i < 4; ++i) {
65 if (mouseArea.contains(QLineF(polygon().at(i), polygon().at(j)).pointAt(.5))) {
75 void OnMonitorCornersItem::slotMousePressed(QGraphicsSceneMouseEvent* event)
82 m_mode = getMode(event->scenePos(), &m_selectedCorner);
83 m_lastPoint = event->scenePos();
86 void OnMonitorCornersItem::slotMouseMoved(QGraphicsSceneMouseEvent* event)
91 emit requestCursor(QCursor(Qt::ArrowCursor));
95 /*if (event->buttons() != Qt::NoButton && (event->screenPos() - m_screenClickPoint).manhattanLength() < QApplication::startDragDistance()) {
100 if (event->buttons() & Qt::LeftButton) {
101 QPointF mousePos = mapFromScene(event->scenePos());
102 QPolygonF p = polygon();
105 p.replace(m_selectedCorner, mousePos);
109 p.translate(mousePos - m_lastPoint);
113 p[m_selectedCorner] += mousePos - m_lastPoint;
114 p[(m_selectedCorner + 1) % 4] += mousePos - m_lastPoint;
120 m_lastPoint = mousePos;
124 switch (getMode(event->scenePos(), &corner)) {
126 emit requestCursor(QCursor(Qt::ArrowCursor));
129 emit requestCursor(QCursor(Qt::SizeAllCursor));
132 emit requestCursor(QCursor(Qt::OpenHandCursor));
136 if (m_modified && KdenliveSettings::monitorscene_directupdate()) {
137 emit actionFinished();
142 void OnMonitorCornersItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
144 painter->setPen(QPen(Qt::yellow, 1, Qt::SolidLine));
146 if (KdenliveSettings::onmonitoreffects_cornersshowlines())
147 QGraphicsPolygonItem::paint(painter, option, widget);
149 if (polygon().count() != 4)
152 double baseSize = 1 / painter->matrix().m11();
153 painter->setRenderHint(QPainter::Antialiasing);
154 painter->setBrush(QBrush(isEnabled() ? Qt::yellow : Qt::red));
155 double handleSize = 4 * baseSize;
156 for (int i = 0; i < 4; ++i)
157 painter->drawEllipse(polygon().at(i), handleSize, handleSize);
159 if (KdenliveSettings::onmonitoreffects_cornersshowcontrols() && isEnabled()) {
160 painter->setPen(QPen(Qt::red, 2, Qt::SolidLine));
161 double toolSize = 6 * baseSize;
163 QPointF c = getCentroid();
164 painter->drawLine(QLineF(c - QPointF(toolSize, toolSize), c + QPointF(toolSize, toolSize)));
165 painter->drawLine(QLineF(c - QPointF(-toolSize, toolSize), c + QPointF(-toolSize, toolSize)));
167 // move side tools (2 corners at once)
169 for (int i = 0; i < 4; ++i) {
171 QPointF m = QLineF(polygon().at(i), polygon().at(j)).pointAt(.5);
172 painter->drawRect(QRectF(-toolSize / 2., -toolSize / 2., toolSize, toolSize).translated(m));
177 QPointF OnMonitorCornersItem::getCentroid()
179 QList <QPointF> p = sortedClockwise();
182 * See: http://local.wasp.uwa.edu.au/~pbourke/geometry/polyarea/
187 for (i = 0; i < 4; ++i) {
189 A += p[j].x() * p[i].y() - p[i].x() * p[j].y();
194 double x = 0, y = 0, f;
195 for (i = 0; i < 4; ++i) {
197 f = (p[i].x() * p[j].y() - p[j].x() * p[i].y());
198 x += f * (p[i].x() + p[j].x());
199 y += f * (p[i].y() + p[j].y());
203 return QPointF(x, y);
206 QList <QPointF> OnMonitorCornersItem::sortedClockwise()
208 QList <QPointF> points = polygon().toList();
209 QPointF& a = points[0];
210 QPointF& b = points[1];
211 QPointF& c = points[2];
212 QPointF& d = points[3];
215 * http://stackoverflow.com/questions/242404/sort-four-points-in-clockwise-order
218 double abc = a.x() * b.y() - a.y() * b.x() + b.x() * c.y() - b.y() * c.x() + c.x() * a.y() - c.y() * a.x();
220 double acd = a.x() * c.y() - a.y() * c.x() + c.x() * d.y() - c.y() * d.x() + d.x() * a.y() - d.y() * a.x();
224 double abd = a.x() * b.y() - a.y() * b.x() + b.x() * d.y() - b.y() * d.x() + d.x() * a.y() - d.y() * a.x();
232 double acd = a.x() * c.y() - a.y() * c.x() + c.x() * d.y() - c.y() * d.x() + d.x() * a.y() - d.y() * a.x();
234 double abd = a.x() * b.y() - a.y() * b.x() + b.x() * d.y() - b.y() * d.x() + d.x() * a.y() - d.y() * a.x();
247 #include "onmonitorcornersitem.moc"