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Different color map classification handling in discrete mode

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pierstitus authored and nyalldawson committed Apr 13, 2016
1 parent c84dc8d commit 624b06bcc374ed864663bbe95b8eb76c166ac34f
Showing with 79 additions and 42 deletions.
  1. +79 −42 src/gui/raster/qgssinglebandpseudocolorrendererwidget.cpp
@@ -227,6 +227,10 @@ void QgsSingleBandPseudoColorRendererWidget::autoLabel()
{
label = "<= " + currentItem->text( ValueColumn ) + unit;
}
else if ( currentItem->text( ValueColumn ).toDouble() == std::numeric_limits<double>::infinity() )
{
label = "> " + mColormapTreeWidget->topLevelItem( i - 1 )->text( ValueColumn );
}
else
{
label = mColormapTreeWidget->topLevelItem( i - 1 )->text( ValueColumn ) + " - " + currentItem->text( ValueColumn ) + unit;
@@ -345,6 +349,8 @@ void QgsSingleBandPseudoColorRendererWidget::on_mClassifyButton_clicked()
//QgsRasterBandStats myRasterBandStats = mRasterLayer->dataProvider()->bandStatistics( bandNr );
int numberOfEntries = 0;

bool discrete = mColorInterpolationComboBox->currentText() == tr( "Discrete" );

QList<double> entryValues;
QVector<QColor> entryColors;

@@ -358,18 +364,29 @@ void QgsSingleBandPseudoColorRendererWidget::on_mClassifyButton_clicked()
if ( colorRamp )
{
numberOfEntries = colorRamp->count();
entryValues.reserve( colorRamp->count() );
for ( int i = 0; i < colorRamp->count(); ++i )
entryValues.reserve( numberOfEntries );
if ( discrete )
{
double value = colorRamp->value( i );
entryValues.push_back( min + value * ( max - min ) );
double intervalDiff = ( max - min ) * ( numberOfEntries - 1 ) / numberOfEntries;
for ( int i = 1; i < numberOfEntries; ++i )
{
double value = colorRamp->value( i );
entryValues.push_back( min + value * intervalDiff );
}
entryValues.push_back( std::numeric_limits<double>::infinity() );
}
else
{
for ( int i = 0; i < numberOfEntries; ++i )
{
double value = colorRamp->value( i );
entryValues.push_back( min + value * ( max - min ) );
}
}
}
}
else if ( mClassificationModeComboBox->itemData( mClassificationModeComboBox->currentIndex() ).toInt() == Quantile )
{ // Quantile
mMinMaxWidget->load();

numberOfEntries = mNumberOfEntriesSpinBox->value();

int bandNr = mBandComboBox->itemData( bandComboIndex ).toInt();
@@ -381,15 +398,31 @@ void QgsSingleBandPseudoColorRendererWidget::on_mClassifyButton_clicked()
QgsRectangle extent = mMinMaxWidget->extent();
int sampleSize = mMinMaxWidget->sampleSize();

// set min and max from histogram, used later to calculate number of decimals to display
mRasterLayer->dataProvider()->cumulativeCut( bandNr, 0.0, 1.0, min, max, extent, sampleSize );

double intervalDiff;
if ( numberOfEntries > 1 )
{
intervalDiff = 1.0 / ( numberOfEntries - 1 );
entryValues.reserve( numberOfEntries );
for ( int i = 0; i < numberOfEntries; ++i )
if ( discrete )
{
mRasterLayer->dataProvider()->cumulativeCut( bandNr, 0.0, i * intervalDiff, cut1, cut2, extent, sampleSize );
entryValues.push_back( cut2 );
intervalDiff = 1.0 / ( numberOfEntries );
for ( int i = 1; i < numberOfEntries; ++i )
{
mRasterLayer->dataProvider()->cumulativeCut( bandNr, 0.0, i * intervalDiff, cut1, cut2, extent, sampleSize );
entryValues.push_back( cut2 );
}
entryValues.push_back( std::numeric_limits<double>::infinity() );
}
else
{
intervalDiff = 1.0 / ( numberOfEntries - 1 );
for ( int i = 0; i < numberOfEntries; ++i )
{
mRasterLayer->dataProvider()->cumulativeCut( bandNr, 0.0, i * intervalDiff, cut1, cut2, extent, sampleSize );
entryValues.push_back( cut2 );
}
}
}
else if ( numberOfEntries == 1 )
@@ -401,45 +434,47 @@ void QgsSingleBandPseudoColorRendererWidget::on_mClassifyButton_clicked()
else // EqualInterval
{
numberOfEntries = mNumberOfEntriesSpinBox->value();
//double currentValue = myRasterBandStats.minimumValue;
double currentValue = min;
double intervalDiff;

if ( numberOfEntries > 1 )
{
//because the highest value is also an entry, there are (numberOfEntries - 1)
//intervals
//intervalDiff = ( myRasterBandStats.maximumValue - myRasterBandStats.minimumValue ) /
intervalDiff = ( max - min ) / ( numberOfEntries - 1 );
}
else
{
//intervalDiff = myRasterBandStats.maximumValue - myRasterBandStats.minimumValue;
intervalDiff = max - min;
}
entryValues.reserve( numberOfEntries );
if ( discrete )
{
// in discrete mode the lowest value is not an entry and the highest
// value is inf, there are ( numberOfEntries ) of which the first
// and last are not used.
double intervalDiff = ( max - min ) / ( numberOfEntries );

entryValues.reserve( numberOfEntries );
for ( int i = 0; i < numberOfEntries; ++i )
for ( int i = 1; i < numberOfEntries; ++i )
{
entryValues.push_back( min + i * intervalDiff );
}
entryValues.push_back( std::numeric_limits<double>::infinity() );
}
else
{
//because the highest value is also an entry, there are (numberOfEntries - 1) intervals
double intervalDiff = ( max - min ) / ( numberOfEntries - 1 );

for ( int i = 0; i < numberOfEntries; ++i )
{
entryValues.push_back( min + i * intervalDiff );
}
}
}
else if ( numberOfEntries == 1 )
{
entryValues.push_back( currentValue );
currentValue += intervalDiff;
if ( discrete )
{
entryValues.push_back( std::numeric_limits<double>::infinity() );
}
else
{
entryValues.push_back(( max + min ) / 2 );
}
}
}

#if 0
//hard code color range from blue -> red for now. Allow choice of ramps in future
int colorDiff = 0;
if ( numberOfEntries != 0 )
{
colorDiff = ( int )( 255 / numberOfEntries );
}
for ( int i = 0; i < numberOfEntries; ++i )
{
QColor currentColor;
currentColor.setRgb( colorDiff*i, 0, 255 - colorDiff * i );
entryColors.push_back( currentColor );
}
#endif

if ( ! colorRamp )
{
//hard code color range from blue -> red (previous default)
@@ -494,6 +529,8 @@ void QgsSingleBandPseudoColorRendererWidget::on_mClassifyButton_clicked()
void QgsSingleBandPseudoColorRendererWidget::on_mClassificationModeComboBox_currentIndexChanged( int index )
{
mNumberOfEntriesSpinBox->setEnabled( mClassificationModeComboBox->itemData( index ).toInt() != Continuous );
mMinLineEdit->setEnabled( mClassificationModeComboBox->itemData( index ).toInt() != Quantile );
mMaxLineEdit->setEnabled( mClassificationModeComboBox->itemData( index ).toInt() != Quantile );
}

void QgsSingleBandPseudoColorRendererWidget::on_mColorRampComboBox_currentIndexChanged( int index )

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