ground/openpilotgcs/src/plugins/uavobjectwidgetutils/mixercurveline.cpp

   1 /**
   2  ******************************************************************************
   3  *
   4  * @file       mixercurveline.h
   5  * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
   6  * @addtogroup GCSPlugins GCS Plugins
   7  * @{
   8  * @addtogroup UAVObjectWidgetUtils Plugin
   9  * @{
  10  * @brief Utility plugin for UAVObject to Widget relation management
  11  *****************************************************************************/
  12 /*
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 3 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  21  * for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License along
  24  * with this program; if not, write to the Free Software Foundation, Inc.,
  25  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  */
  27
  28 #include <QPainter>
  29
  30 #include "mixercurveline.h"
  31 #include "mixercurvepoint.h"
  32
  33 #include <qmath.h>
  34
  35
  36 Edge::Edge(MixerNode *sourceNode, MixerNode *destNode)
  37     : arrowSize(10)
  38 {
  39     setAcceptedMouseButtons(0);
  40     source = sourceNode;
  41     dest   = destNode;
  42     source->addEdge(this);
  43     dest->addEdge(this);
  44     adjust();
  45 }
  46
  47 Edge::~Edge()
  48 {}
  49
  50 MixerNode *Edge::sourceNode() const
  51 {
  52     return source;
  53 }
  54
  55 void Edge::setSourceNode(MixerNode *node)
  56 {
  57     source = node;
  58     adjust();
  59 }
  60
  61 MixerNode *Edge::destNode() const
  62 {
  63     return dest;
  64 }
  65
  66 void Edge::setDestNode(MixerNode *node)
  67 {
  68     dest = node;
  69     adjust();
  70 }
  71
  72 void Edge::adjust()
  73 {
  74     if (!source || !dest) {
  75         return;
  76     }
  77
  78     QLineF line(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0));
  79     qreal length = line.length();
  80
  81     prepareGeometryChange();
  82
  83     if (length > qreal(20.)) {
  84         QPointF edgeOffset((line.dx() * 13) / length, (line.dy() * 13) / length);
  85         sourcePoint = line.p1() + edgeOffset;
  86         destPoint   = line.p2() - edgeOffset;
  87     } else {
  88         sourcePoint = destPoint = line.p1();
  89     }
  90 }
  91
  92 QRectF Edge::boundingRect() const
  93 {
  94     if (!source || !dest) {
  95         return QRectF();
  96     }
  97
  98     qreal penWidth = 1;
  99     qreal extra    = (penWidth + arrowSize) / 2.0;
 100
 101     return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(),
 102                                       destPoint.y() - sourcePoint.y()))
 103            .normalized()
 104            .adjusted(-extra, -extra, extra, extra);
 105 }
 106
 107 void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
 108 {
 109     if (!source || !dest) {
 110         return;
 111     }
 112
 113     QLineF line(sourcePoint, destPoint);
 114     if (qFuzzyCompare(line.length(), qreal(0.))) {
 115         return;
 116     }
 117
 118     // Draw the line itself
 119     painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
 120     painter->drawLine(line);
 121 }