qgsgcpcanvasitem.cpp

/***************************************************************************
     qgsgcpcanvasitem.h
     --------------------------------------
    Date                 : 14-Feb-2010
    Copyright            : (C) 2010 by Jack R, Maxim Dubinin (GIS-Lab)
    Email                : sim@gis-lab.info
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
/* $Id$ */

#include "qgsgcpcanvasitem.h"

QgsGCPCanvasItem::QgsGCPCanvasItem(QgsMapCanvas* mapCanvas, const QgsPoint& rasterCoords,
                                   const QgsPoint& worldCoords, bool isGCPSource )
                                     : QgsMapCanvasItem( mapCanvas )
                                     , mPointBrush(Qt::red)
                                     , mLabelBrush(Qt::yellow)
                                     , mRasterCoords(rasterCoords)
                                     , mWorldCoords(worldCoords)
                                     , mId(-1)
                                     , mIsGCPSource(isGCPSource)
                                     , mEnabled(true)
{
  setFlags(QGraphicsItem::ItemIsMovable);

  updatePosition();
}

void QgsGCPCanvasItem::paint( QPainter* p )
{
  p->setRenderHint(QPainter::Antialiasing);
  p->setOpacity(mEnabled ? 1.0 : 0.3);

  // draw the point
  p->setPen( Qt::black );
  p->setBrush( mPointBrush );
  p->drawEllipse( -2, -2, 5, 5 );

  QSettings s;
  bool showIDs = s.value("/Plugin-GeoReferencer/Config/ShowId").toBool();
  if (!showIDs && mIsGCPSource)
  {
    QString msg = QString( "X %1\nY %2" ).arg( QString::number( mWorldCoords.x(), 'f' ) ).
                  arg( QString::number( mWorldCoords.y(), 'f' ) );
    p->setFont( QFont( "helvetica", 9 ) );
    QRect textBounds = p->boundingRect( 6, 6, 10, 10, Qt::AlignLeft, msg );
    p->setBrush( mLabelBrush );
    p->drawRect( textBounds.x() - 2, textBounds.y() - 2, textBounds.width() + 4, textBounds.height() + 4 );
    p->drawText( textBounds, Qt::AlignLeft, msg );
    mTextBounds = QSizeF(textBounds.width() + 4, textBounds.height() + 4);
  }
  else if (showIDs)
  {
    p->setFont( QFont( "helvetica", 12 ) );
    QString msg = QString::number(mId);
    p->setBrush( mLabelBrush );
    p->drawRect( 5, 4, p->fontMetrics().width(msg) + 2, 14 );
    p->drawText(6, 16, msg);
    QFontMetrics fm = p->fontMetrics();
    mTextBounds = QSize(fm.width(msg) + 4, fm.height() + 4);
  }
  //  else
  //    mTextBounds = QSizeF(0, 0);
}

QRectF QgsGCPCanvasItem::boundingRect() const
{
  return QRectF( -2, -2, mTextBounds.width() + 6, mTextBounds.height() + 6 );
}

QPainterPath QgsGCPCanvasItem::shape() const
{
  QPainterPath p;
  p.addEllipse(-2, -2, 5, 5);
  p.addRect(6, 6, mTextBounds.width(), mTextBounds.height());

  return p;
}

void QgsGCPCanvasItem::setEnabled(bool enabled)
{
  mEnabled = enabled;
  mPointBrush = enabled ? QBrush(Qt::red) : QBrush(Qt::gray);
  mLabelBrush = enabled ? QBrush(Qt::yellow) : QBrush(Qt::gray);
  update();
}

void QgsGCPCanvasItem::setRasterCoords(QgsPoint p)
{
  mRasterCoords = p;
}

void QgsGCPCanvasItem::setWorldCoords(QgsPoint p)
{
  mWorldCoords = p;
}

void QgsGCPCanvasItem::setId(int id) {
  mId = id;
  update();
}

void QgsGCPCanvasItem::updatePosition()
{
  setPos( toCanvasCoordinates( mIsGCPSource ? mRasterCoords : mWorldCoords) );
}