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>
29 #include <QGraphicsView>
31 OnMonitorCornersItem::OnMonitorCornersItem(QGraphicsItem* parent) :
32 QGraphicsPolygonItem(parent),
37 setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);
39 QPen framepen(Qt::SolidLine);
40 framepen.setColor(Qt::yellow);
42 setBrush(Qt::NoBrush);
43 setAcceptHoverEvents(true);
46 OnMonitorCornersItem::cornersActions OnMonitorCornersItem::getMode(QPointF pos, int *corner)
49 if (polygon().count() != 4)
52 QPainterPath mouseArea;
55 size /= m_view->matrix().m11();
56 mouseArea.addRect(pos.x() - size / 2, pos.y() - size / 2, size, size);
57 for (int i = 0; i < 4; ++i) {
58 if (mouseArea.contains(polygon().at(i))) {
63 if (KdenliveSettings::onmonitoreffects_cornersshowcontrols()) {
64 if (mouseArea.contains(getCentroid()))
68 for (int i = 0; i < 4; ++i) {
70 if (mouseArea.contains(QLineF(polygon().at(i), polygon().at(j)).pointAt(.5))) {
80 void OnMonitorCornersItem::mousePressEvent(QGraphicsSceneMouseEvent* event)
82 m_mode = getMode(event->pos(), &m_selectedCorner);
83 m_lastPoint = event->scenePos();
85 if (m_mode == NoAction)
89 void OnMonitorCornersItem::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
91 /*if (event->buttons() != Qt::NoButton && (event->screenPos() - m_screenClickPoint).manhattanLength() < QApplication::startDragDistance()) {
96 if (event->buttons() & Qt::LeftButton) {
97 QPointF mousePos = mapFromScene(event->scenePos());
98 QPolygonF p = polygon();
101 p.replace(m_selectedCorner, mousePos);
105 p.translate(mousePos - m_lastPoint);
109 p[m_selectedCorner] += mousePos - m_lastPoint;
110 p[(m_selectedCorner + 1) % 4] += mousePos - m_lastPoint;
116 m_lastPoint = mousePos;
122 if (KdenliveSettings::monitorscene_directupdate()) {
131 void OnMonitorCornersItem::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
140 void OnMonitorCornersItem::hoverMoveEvent(QGraphicsSceneHoverEvent* event)
143 switch (getMode(event->pos(), &corner)) {
148 setCursor(QCursor(Qt::SizeAllCursor));
151 setCursor(QCursor(Qt::OpenHandCursor));
156 void OnMonitorCornersItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
158 painter->setPen(QPen(Qt::yellow, 1, Qt::SolidLine));
160 if (KdenliveSettings::onmonitoreffects_cornersshowlines())
161 QGraphicsPolygonItem::paint(painter, option, widget);
163 if (polygon().count() != 4)
166 double baseSize = 1 / painter->matrix().m11();
167 painter->setRenderHint(QPainter::Antialiasing);
168 painter->setBrush(QBrush(isEnabled() ? Qt::yellow : Qt::red));
169 double handleSize = 4 * baseSize;
170 for (int i = 0; i < 4; ++i)
171 painter->drawEllipse(polygon().at(i), handleSize, handleSize);
173 if (KdenliveSettings::onmonitoreffects_cornersshowcontrols() && isEnabled()) {
174 painter->setPen(QPen(Qt::red, 2, Qt::SolidLine));
175 double toolSize = 6 * baseSize;
177 QPointF c = getCentroid();
178 painter->drawLine(QLineF(c - QPointF(toolSize, toolSize), c + QPointF(toolSize, toolSize)));
179 painter->drawLine(QLineF(c - QPointF(-toolSize, toolSize), c + QPointF(-toolSize, toolSize)));
181 // move side tools (2 corners at once)
183 for (int i = 0; i < 4; ++i) {
185 QPointF m = QLineF(polygon().at(i), polygon().at(j)).pointAt(.5);
186 painter->drawRect(QRectF(-toolSize / 2., -toolSize / 2., toolSize, toolSize).translated(m));
191 QPointF OnMonitorCornersItem::getCentroid()
193 QList <QPointF> p = sortedClockwise();
196 * See: http://local.wasp.uwa.edu.au/~pbourke/geometry/polyarea/
201 for (i = 0; i < 4; ++i) {
203 A += p[j].x() * p[i].y() - p[i].x() * p[j].y();
208 double x = 0, y = 0, f;
209 for (i = 0; i < 4; ++i) {
211 f = (p[i].x() * p[j].y() - p[j].x() * p[i].y());
212 x += f * (p[i].x() + p[j].x());
213 y += f * (p[i].y() + p[j].y());
217 return QPointF(x, y);
220 QList <QPointF> OnMonitorCornersItem::sortedClockwise()
222 QList <QPointF> points = polygon().toList();
223 QPointF& a = points[0];
224 QPointF& b = points[1];
225 QPointF& c = points[2];
226 QPointF& d = points[3];
229 * http://stackoverflow.com/questions/242404/sort-four-points-in-clockwise-order
232 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();
234 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();
238 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();
246 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();
248 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();
261 bool OnMonitorCornersItem::getView()
266 if (scene() && scene()->views().count()) {
267 m_view = scene()->views()[0];
274 #include "onmonitorcornersitem.moc"