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qgspointrotationitem.cpp
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qgspointrotationitem.cpp
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/***************************************************************************
qgspointrotationitem.cpp
------------------------
begin : September 2009
copyright : (C) 2009 by Marco Hugentobler
email : marco at hugis dot net
***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "qgspointrotationitem.h"
#include <QPainter>
#include <QLocale>
#include <cmath>
#include "qgsguiutils.h"
QgsPointRotationItem::QgsPointRotationItem( QgsMapCanvas *canvas )
: QgsMapCanvasItem( canvas )
{
//setup font
mFont.setPointSize( 12 );
mFont.setBold( true );
QImage im( 24, 24, QImage::Format_ARGB32 );
im.fill( Qt::transparent );
setSymbol( im );
}
void QgsPointRotationItem::paint( QPainter *painter )
{
if ( !painter )
{
return;
}
painter->setRenderHint( QPainter::Antialiasing, true );
painter->save();
//do a bit of trigonometry to find out how to transform a rotated item such that the center point is at the point feature
double x = 0;
double y = 0;
double h, dAngel;
if ( mPixmap.width() > 0 && mPixmap.height() > 0 )
{
h = std::sqrt( ( double ) mPixmap.width() * mPixmap.width() + mPixmap.height() * mPixmap.height() ) / 2; //the half of the item diagonal
dAngel = std::acos( mPixmap.width() / ( h * 2 ) ) * 180 / M_PI; //the diagonal angel of the original rect
x = h * std::cos( ( painterRotation( mRotation ) - dAngel ) * M_PI / 180 );
y = h * std::sin( ( painterRotation( mRotation ) - dAngel ) * M_PI / 180 );
}
painter->rotate( painterRotation( mRotation ) );
painter->translate( x - mPixmap.width() / 2.0, -y - mPixmap.height() / 2.0 );
painter->drawPixmap( 0, 0, mPixmap );
//draw arrow, using a red line over a thicker white line so that the arrow is visible against a range of backgrounds
QPen pen;
pen.setWidth( QgsGuiUtils::scaleIconSize( 4 ) );
pen.setColor( QColor( Qt::white ) );
painter->setPen( pen );
painter->drawPath( mArrowPath );
pen.setWidth( QgsGuiUtils::scaleIconSize( 1 ) );
pen.setColor( QColor( Qt::red ) );
painter->setPen( pen );
painter->drawPath( mArrowPath );
painter->restore();
//draw numeric value beside the symbol
painter->save();
QPen bufferPen;
bufferPen.setColor( Qt::white );
bufferPen.setWidthF( QgsGuiUtils::scaleIconSize( 4 ) );
const QFontMetricsF fm( mFont );
QPainterPath label;
const double rotationText = mRotation * QgsUnitTypes::fromUnitToUnitFactor( QgsUnitTypes::AngleDegrees,
mRotationUnit );
label.addText( mPixmap.width(),
mPixmap.height() / 2.0 + fm.height() / 2.0,
mFont,
QgsUnitTypes::formatAngle( rotationText,
mRotationUnit ) );
painter->setPen( bufferPen );
painter->setBrush( Qt::NoBrush );
painter->drawPath( label );
painter->setPen( Qt::NoPen );
painter->setBrush( QBrush( Qt::black ) );
painter->drawPath( label );
painter->restore();
}
void QgsPointRotationItem::setPointLocation( const QgsPointXY &p )
{
const QPointF transformedPoint = toCanvasCoordinates( p );
setPos( transformedPoint.x() - mPixmap.width() / 2.0, transformedPoint.y() - mPixmap.height() / 2.0 );
}
void QgsPointRotationItem::setRotationUnit( const QgsUnitTypes::AngleUnit &rotationUnit )
{
mRotationUnit = rotationUnit;
}
void QgsPointRotationItem::setSymbol( const QImage &symbolImage )
{
mPixmap = QPixmap::fromImage( symbolImage );
const QFontMetricsF fm( mFont );
//set item size: 6283 millirad arcseconds = 360°
mItemSize.setWidth( mPixmap.width() + fm.horizontalAdvance( QStringLiteral( "6283 millirad" ) ) );
const double pixmapHeight = mPixmap.height();
const double fontHeight = fm.height();
if ( pixmapHeight >= fontHeight )
{
mItemSize.setHeight( mPixmap.height() );
}
else
{
mItemSize.setHeight( fm.height() );
}
const double halfItemWidth = mPixmap.width() / 2.0;
mArrowPath = QPainterPath();
mArrowPath.moveTo( halfItemWidth, pixmapHeight );
mArrowPath.lineTo( halfItemWidth, 0 );
mArrowPath.moveTo( mPixmap.width() * 0.25, pixmapHeight * 0.25 );
mArrowPath.lineTo( halfItemWidth, 0 );
mArrowPath.lineTo( mPixmap.width() * 0.75, pixmapHeight * 0.25 );
}
int QgsPointRotationItem::painterRotation( int rotation ) const
{
if ( mOrientation == Clockwise )
{
return rotation;
}
return 360 - ( rotation % 360 );
}