runtime/phonon/tests/guitest/pathitem.cpp

   1 /*  This file is part of the KDE project
   2     Copyright (C) 2007 Matthias Kretz <kretz@kde.org>
   3
   4     This library is free software; you can redistribute it and/or
   5     modify it under the terms of the GNU Library General Public
   6     License version 2 as published by the Free Software Foundation.
   7
   8     This library is distributed in the hope that it will be useful,
   9     but WITHOUT ANY WARRANTY; without even the implied warranty of
  10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11     Library General Public License for more details.
  12
  13     You should have received a copy of the GNU Library General Public License
  14     along with this library; see the file COPYING.LIB.  If not, write to
  15     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  16     Boston, MA 02110-1301, USA.
  17
  18 */
  19
  20 #include "pathitem.h"
  21 #include <QtGui/QLinearGradient>
  22 #include <QtGui/QPainterPath>
  23 #include <QtGui/QPen>
  24
  25 PathItem::PathItem(WidgetRectItem *start, WidgetRectItem *end, const Path &_path)
  26     : m_path(_path), m_startItem(start), m_endItem(end)
  27 {
  28     m_startPos.setX(start->sceneBoundingRect().right());
  29     m_startPos.setY(start->sceneBoundingRect().center().y());
  30     m_endPos.setX(end->sceneBoundingRect().left());
  31     m_endPos.setY(end->sceneBoundingRect().center().y());
  32     updatePainterPath();
  33
  34     setZValue(-1.0);
  35     start->addPath(this);
  36     end->addPath(this);
  37 }
  38
  39 void PathItem::endPointMoved(const WidgetRectItem *item)
  40 {
  41     if (item == m_startItem) {
  42         m_startPos.setX(item->sceneBoundingRect().right());
  43         m_startPos.setY(item->sceneBoundingRect().center().y());
  44     } else if (item == m_endItem) {
  45         m_endPos.setX(item->sceneBoundingRect().left());
  46         m_endPos.setY(item->sceneBoundingRect().center().y());
  47     }
  48     updatePainterPath();
  49 }
  50
  51 void PathItem::updatePainterPath()
  52 {
  53     QPainterPath path;
  54     path.moveTo(m_startPos);
  55     path.cubicTo(m_startPos + QPointF(150.0, 0.0),
  56             m_endPos - QPointF(150.0, 0.0),
  57             m_endPos);
  58     setPath(path);
  59
  60     QLinearGradient gradient(m_startPos, m_endPos);
  61     gradient.setColorAt(0, QColor(64, 0, 0, 200));
  62     gradient.setColorAt(1, QColor(0, 64, 0, 200));
  63     setPen(QPen(gradient, 3.0));
  64
  65     updateChildrenPositions();
  66 }
  67
  68 void PathItem::updateChildrenPositions()
  69 {
  70     const qreal divisor = QGraphicsItem::children().count() + 1;
  71     int positionOnLine = 0;
  72     foreach (QGraphicsItem *item, QGraphicsItem::children()) {
  73         item->setPos(QGraphicsPathItem::path().pointAtPercent(++positionOnLine / divisor) - item->boundingRect().center());
  74     }
  75 }