QGIS API Documentation  2.17.0-Master (f49f7ce)
qgssinglebandgrayrendererwidget.cpp
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1 /***************************************************************************
2  qgssinglebandgrayrendererwidget.h
3  ---------------------------------
4  begin : March 2012
5  copyright : (C) 2012 by Marco Hugentobler
6  email : marco at sourcepole dot ch
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
20 #include "qgsrasterlayer.h"
21 
23  : QgsRasterRendererWidget( layer, extent )
24  , mMinMaxWidget( nullptr )
25 {
26  setupUi( this );
27 
28  mGradientComboBox->insertItem( 0, tr( "Black to white" ), QgsSingleBandGrayRenderer::BlackToWhite );
29  mGradientComboBox->insertItem( 1, tr( "White to black" ), QgsSingleBandGrayRenderer::WhiteToBlack );
30 
31  mMinLineEdit->setValidator( new QDoubleValidator( mMinLineEdit ) );
32  mMaxLineEdit->setValidator( new QDoubleValidator( mMaxLineEdit ) );
33 
34  if ( mRasterLayer )
35  {
37  if ( !provider )
38  {
39  return;
40  }
41 
42  mMinMaxWidget = new QgsRasterMinMaxWidget( layer, this );
43  mMinMaxWidget->setExtent( extent );
44  mMinMaxWidget->setMapCanvas( mCanvas );
45 
47  layout->setContentsMargins( 0, 0, 0, 0 );
48  mMinMaxContainerWidget->setLayout( layout );
49  layout->addWidget( mMinMaxWidget );
50 
51  connect( mMinMaxWidget, SIGNAL( load( int, double, double, int ) ),
52  this, SLOT( loadMinMax( int, double, double, int ) ) );
53 
54  //fill available bands into combo box
55  int nBands = provider->bandCount();
56  for ( int i = 1; i <= nBands; ++i ) //band numbering seem to start at 1
57  {
58  mGrayBandComboBox->addItem( displayBandName( i ), i );
59  }
60 
61  //contrast enhancement algorithms
62  mContrastEnhancementComboBox->addItem( tr( "No enhancement" ), 0 );
63  mContrastEnhancementComboBox->addItem( tr( "Stretch to MinMax" ), 1 );
64  mContrastEnhancementComboBox->addItem( tr( "Stretch and clip to MinMax" ), 2 );
65  mContrastEnhancementComboBox->addItem( tr( "Clip to MinMax" ), 3 );
66 
67  setFromRenderer( layer->renderer() );
68 
69  connect( mGradientComboBox, SIGNAL( currentIndexChanged( int ) ), this, SIGNAL( widgetChanged() ) );
70  connect( mContrastEnhancementComboBox, SIGNAL( currentIndexChanged( int ) ), this, SIGNAL( widgetChanged() ) );
71  connect( mMaxLineEdit, SIGNAL( textChanged( QString ) ), this, SIGNAL( widgetChanged() ) );
72  connect( mMinLineEdit, SIGNAL( textChanged( QString ) ), this, SIGNAL( widgetChanged() ) );
73  }
74 }
75 
77 {
78 }
79 
81 {
82  if ( !mRasterLayer )
83  {
84  return nullptr;
85  }
87  if ( !provider )
88  {
89  return nullptr;
90  }
91  int band = mGrayBandComboBox->itemData( mGrayBandComboBox->currentIndex() ).toInt();
92 
94  provider->dataType( band ) ) );
95  e->setMinimumValue( mMinLineEdit->text().toDouble() );
96  e->setMaximumValue( mMaxLineEdit->text().toDouble() );
98  mContrastEnhancementComboBox->currentIndex() ).toInt() ) );
99 
100 
102  renderer->setContrastEnhancement( e );
103 
104  renderer->setGradient(( QgsSingleBandGrayRenderer::Gradient ) mGradientComboBox->itemData( mGradientComboBox->currentIndex() ).toInt() );
105 
106  return renderer;
107 }
108 
110 {
112  mMinMaxWidget->setMapCanvas( canvas );
113 }
114 
115 void QgsSingleBandGrayRendererWidget::loadMinMax( int theBandNo, double theMin, double theMax, int theOrigin )
116 {
117  Q_UNUSED( theBandNo );
118  Q_UNUSED( theOrigin );
119  QgsDebugMsg( QString( "theBandNo = %1 theMin = %2 theMax = %3" ).arg( theBandNo ).arg( theMin ).arg( theMax ) );
120 
121  if ( qIsNaN( theMin ) )
122  {
123  mMinLineEdit->clear();
124  }
125  else
126  {
127  mMinLineEdit->setText( QString::number( theMin ) );
128  }
129 
130  if ( qIsNaN( theMax ) )
131  {
132  mMaxLineEdit->clear();
133  }
134  else
135  {
136  mMaxLineEdit->setText( QString::number( theMax ) );
137  }
138 }
139 
140 void QgsSingleBandGrayRendererWidget::on_mGrayBandComboBox_currentIndexChanged( int index )
141 {
142  QList<int> myBands;
143  myBands.append( mGrayBandComboBox->itemData( index ).toInt() );
144  mMinMaxWidget->setBands( myBands );
145  emit widgetChanged();
146 }
147 
149 {
150  const QgsSingleBandGrayRenderer* gr = dynamic_cast<const QgsSingleBandGrayRenderer*>( r );
151  if ( gr )
152  {
153  //band
154  mGrayBandComboBox->setCurrentIndex( mGrayBandComboBox->findData( gr->grayBand() ) );
156 
157  mGradientComboBox->setCurrentIndex( mGradientComboBox->findData( gr->gradient() ) );
158  //minmax
159  mMinLineEdit->setText( QString::number( ce->minimumValue() ) );
160  mMaxLineEdit->setText( QString::number( ce->maximumValue() ) );
161  //contrast enhancement algorithm
162  mContrastEnhancementComboBox->setCurrentIndex(
163  mContrastEnhancementComboBox->findData(( int )( ce->contrastEnhancementAlgorithm() ) ) );
164  }
165 }
QLayout * layout() const
virtual int bandCount() const =0
Get number of bands.
void setContrastEnhancementAlgorithm(ContrastEnhancementAlgorithm, bool generateTable=true)
Set the contrast enhancement algorithm.
static unsigned index
A rectangle specified with double values.
Definition: qgsrectangle.h:35
void setContentsMargins(int left, int top, int right, int bottom)
void setupUi(QWidget *widget)
ContrastEnhancementAlgorithm contrastEnhancementAlgorithm() const
#define QgsDebugMsg(str)
Definition: qgslogger.h:33
This class provides qgis with the ability to render raster datasets onto the mapcanvas.
void setBands(const QList< int > &theBands)
const QgsContrastEnhancement * contrastEnhancement() const
void setMapCanvas(QgsMapCanvas *canvas) override
Sets the map canvas associated with the widget.
void loadMinMax(int theBandNo, double theMin, double theMax, int theOrigin)
QString tr(const char *sourceText, const char *disambiguation, int n)
Map canvas is a class for displaying all GIS data types on a canvas.
Definition: qgsmapcanvas.h:109
virtual void setMapCanvas(QgsMapCanvas *canvas)
Sets the map canvas associated with the widget.
void addWidget(QWidget *widget, int stretch, QFlags< Qt::AlignmentFlag > alignment)
QString number(int n, int base)
void append(const T &value)
QgsRasterRenderer * renderer() const
void setExtent(const QgsRectangle &theExtent)
Sets the extent to use for minimum and maximum value calculation.
QgsSingleBandGrayRendererWidget(QgsRasterLayer *layer, const QgsRectangle &extent=QgsRectangle())
void setMinimumValue(double, bool generateTable=true)
Return the minimum value for the contrast enhancement range.
Raster renderer pipe for single band gray.
double minimumValue() const
Return the minimum value for the contrast enhancement range.
void setGradient(Gradient theGradient)
virtual QGis::DataType dataType(int bandNo) const override=0
Returns data type for the band specified by number.
void setContrastEnhancement(QgsContrastEnhancement *ce)
Takes ownership.
ContrastEnhancementAlgorithm
This enumerator describes the types of contrast enhancement algorithms that can be used...
QString displayBandName(int band) const
Returns a band name for display.
void setMapCanvas(QgsMapCanvas *canvas)
Sets the map canvas associated with the widget.
double maximumValue() const
Return the maximum value for the contrast enhancement range.
void setFromRenderer(const QgsRasterRenderer *r)
DataType
Raster data types.
Definition: qgis.h:133
Manipulates raster pixel values so that they enhanceContrast or clip into a specified numerical range...
QgsRasterDataProvider * dataProvider()
Returns the data provider.
bool connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
QgsMapCanvas * mCanvas
Associated map canvas.
void widgetChanged()
Emitted when something on the widget has changed.
Raster renderer pipe that applies colors to a raster.
void setMaximumValue(double, bool generateTable=true)
Set the maximum value for the contrast enhancement range.
Base class for raster data providers.