float QgsHillshadeFilter::processNineCellWindow( float *x11, float *x21, float *x31,
float *x12, float *x22, float *x32,
float *x13, float *x23, float *x33 )
{
float derX = calcFirstDerX( x11, x21, x31, x12, x22, x32, x13, x23, x33 );
float derY = calcFirstDerY( x11, x21, x31, x12, x22, x32, x13, x23, x33 );
if ( derX == mOutputNodataValue || derY == mOutputNodataValue )
{
return mOutputNodataValue;
}
float zenith_rad = mLightAngle * M_PI / 180.0;
float slope_rad = atan( sqrt( derX * derX + derY * derY ) );
float azimuth_rad = mLightAzimuth * M_PI / 180.0;
float aspect_rad = 0;
if ( derX == 0 && derY == 0 ) //aspect undefined, take a neutral value. Better solutions?
{
aspect_rad = azimuth_rad / 2.0;
}
else
{
aspect_rad = M_PI + atan2( derX, derY );
}
return qMax( 0.0, 255.0 * ( ( cos( zenith_rad ) * cos( slope_rad ) ) + ( sin( zenith_rad ) * sin( slope_rad ) * cos( azimuth_rad - aspect_rad ) ) ) );
}
float QgsHillshadeFilter::processNineCellWindow( float *x11, float *x21, float *x31,
float *x12, float *x22, float *x32,
float *x13, float *x23, float *x33 )
{
float derX = calcFirstDerX( x11, x21, x31, x12, x22, x32, x13, x23, x33 );
float derY = calcFirstDerY( x11, x21, x31, x12, x22, x32, x13, x23, x33 );
if ( derX == mOutputNodataValue || derY == mOutputNodataValue )
{
return mOutputNodataValue;
}
float slope_rad = std::atan( std::sqrt( derX * derX + derY * derY ) );
float aspect_rad = 0;
if ( derX == 0 && derY == 0 ) //aspect undefined, take a neutral value. Better solutions?
{
aspect_rad = mAzimuthRad / 2.0f;
}
else
{
aspect_rad = M_PI + std::atan2( derX, derY );
}
return std::max( 0.0f, 255.0f * ( ( mCosZenithRad * std::cos( slope_rad ) ) +
( mSinZenithRad * std::sin( slope_rad ) *
std::cos( mAzimuthRad - aspect_rad ) ) ) );
}
float QgsAspectFilter::processNineCellWindow(
float *x11, float *x21, float *x31,
float *x12, float *x22, float *x32,
float *x13, float *x23, float *x33 )
{
float derX = calcFirstDerX( x11, x21, x31, x12, x22, x32, x13, x23, x33 );
float derY = calcFirstDerY( x11, x21, x31, x12, x22, x32, x13, x23, x33 );
if ( derX == mOutputNodataValue ||
derY == mOutputNodataValue ||
( derX == 0.0 && derY == 0.0 ) )
{
return mOutputNodataValue;
}
else
{
return 180.0 + std::atan2( derX, derY ) * 180.0 / M_PI;
}
}
QgsRasterBlock *QgsHillshadeRenderer::block( int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback* feedback )
{
Q_UNUSED( bandNo );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
QgsDebugMsg( "No input raster!" );
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( mBand, extent, width, height, feedback );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
QgsRasterBlock *alphaBlock = nullptr;
if ( mAlphaBand > 0 && mBand != mAlphaBand )
{
alphaBlock = mInput->block( mAlphaBand, extent, width, height, feedback );
if ( !alphaBlock || alphaBlock->isEmpty() )
{
// TODO: better to render without alpha
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
}
else if ( mAlphaBand > 0 )
{
alphaBlock = inputBlock;
}
if ( !outputBlock->reset( Qgis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
delete alphaBlock;
return outputBlock;
}
double cellXSize = extent.width() / double( width );
double cellYSize = extent.height() / double( height );
double zenithRad = qMax( 0.0, 90 - mLightAngle ) * M_PI / 180.0;
double azimuthRad = -1 * mLightAzimuth * M_PI / 180.0;
double cosZenithRad = cos( zenithRad );
double sinZenithRad = sin( zenithRad );
// Multi direction hillshade: http://pubs.usgs.gov/of/1992/of92-422/of92-422.pdf
double angle0Rad = ( -1 * mLightAzimuth - 45 - 45 * 0.5 ) * M_PI / 180.0;
double angle1Rad = ( -1 * mLightAzimuth - 45 * 0.5 ) * M_PI / 180.0;
double angle2Rad = ( -1 * mLightAzimuth + 45 * 0.5 ) * M_PI / 180.0;
double angle3Rad = ( -1 * mLightAzimuth + 45 + 45 * 0.5 ) * M_PI / 180.0;
QRgb myDefaultColor = NODATA_COLOR;
for ( qgssize i = 0; i < ( qgssize )height; i++ )
{
for ( qgssize j = 0; j < ( qgssize )width; j++ )
{
if ( inputBlock->isNoData( i, j ) )
{
outputBlock->setColor( i, j, myDefaultColor );
continue;
}
qgssize iUp, iDown, jLeft, jRight;
if ( i == 0 )
{
iUp = i;
iDown = i + 1;
}
else if ( i < ( qgssize )height - 1 )
{
iUp = i - 1;
iDown = i + 1;
}
else
{
iUp = i - 1;
iDown = i;
}
if ( j == 0 )
{
jLeft = j;
jRight = j + 1;
}
else if ( j < ( qgssize )width - 1 )
{
jLeft = j - 1;
jRight = j + 1;
}
else
{
jLeft = j - 1;
jRight = j;
}
double x11;
double x21;
double x31;
double x12;
double x22; // Working cell
double x32;
double x13;
double x23;
double x33;
// This is center cell. It is not nodata. Use this in place of nodata neighbors
x22 = inputBlock->value( i, j );
x11 = inputBlock->isNoData( iUp, jLeft ) ? x22 : inputBlock->value( iUp, jLeft );
x21 = inputBlock->isNoData( i, jLeft ) ? x22 : inputBlock->value( i, jLeft );
x31 = inputBlock->isNoData( iDown, jLeft ) ? x22 : inputBlock->value( iDown, jLeft );
x12 = inputBlock->isNoData( iUp, j ) ? x22 : inputBlock->value( iUp, j );
// x22
x32 = inputBlock->isNoData( iDown, j ) ? x22 : inputBlock->value( iDown, j );
x13 = inputBlock->isNoData( iUp, jRight ) ? x22 : inputBlock->value( iUp, jRight );
x23 = inputBlock->isNoData( i, jRight ) ? x22 : inputBlock->value( i, jRight );
x33 = inputBlock->isNoData( iDown, jRight ) ? x22 : inputBlock->value( iDown, jRight );
double derX = calcFirstDerX( x11, x21, x31, x12, x22, x32, x13, x23, x33, cellXSize );
double derY = calcFirstDerY( x11, x21, x31, x12, x22, x32, x13, x23, x33, cellYSize );
double slopeRad = atan( mZFactor * sqrt( derX * derX + derY * derY ) );
double aspectRad = atan2( derX, -derY );
double grayValue;
if ( !mMultiDirectional )
{
// Standard single direction hillshade
grayValue = qBound( 0.0, 255.0 * ( cosZenithRad * cos( slopeRad )
+ sinZenithRad * sin( slopeRad )
* cos( azimuthRad - aspectRad ) ) , 255.0 );
}
else
{
// Weighted multi direction as in http://pubs.usgs.gov/of/1992/of92-422/of92-422.pdf
double weight0 = sin( aspectRad - angle0Rad );
double weight1 = sin( aspectRad - angle1Rad );
double weight2 = sin( aspectRad - angle2Rad );
double weight3 = sin( aspectRad - angle3Rad );
weight0 = weight0 * weight0;
weight1 = weight1 * weight1;
weight2 = weight2 * weight2;
weight3 = weight3 * weight3;
double cosSlope = cosZenithRad * cos( slopeRad );
double sinSlope = sinZenithRad * sin( slopeRad );
double color0 = cosSlope + sinSlope * cos( angle0Rad - aspectRad ) ;
double color1 = cosSlope + sinSlope * cos( angle1Rad - aspectRad ) ;
double color2 = cosSlope + sinSlope * cos( angle2Rad - aspectRad ) ;
double color3 = cosSlope + sinSlope * cos( angle3Rad - aspectRad ) ;
grayValue = qBound( 0.0, 255 * ( weight0 * color0 + weight1 * color1 + weight2 * color2 + weight3 * color3 ) * 0.5, 255.0 );
}
double currentAlpha = mOpacity;
if ( mRasterTransparency )
{
currentAlpha = mRasterTransparency->alphaValue( x22, mOpacity * 255 ) / 255.0;
}
if ( mAlphaBand > 0 )
{
currentAlpha *= alphaBlock->value( i ) / 255.0;
}
if ( qgsDoubleNear( currentAlpha, 1.0 ) )
{
outputBlock->setColor( i, j, qRgba( grayValue, grayValue, grayValue, 255 ) );
}
else
{
outputBlock->setColor( i, j, qRgba( currentAlpha * grayValue, currentAlpha * grayValue, currentAlpha * grayValue, currentAlpha * 255 ) );
}
}
}
delete inputBlock;
if ( mAlphaBand > 0 && mBand != mAlphaBand )
{
delete alphaBlock;
}
return outputBlock;
}
QgsRasterBlock *QgsHillshadeRenderer::block( int bandNo, const QgsRectangle &extent, int width, int height )
{
Q_UNUSED( bandNo );
QgsRasterBlock *outputBlock = new QgsRasterBlock();
if ( !mInput )
{
QgsDebugMsg( "No input raster!" );
return outputBlock;
}
QgsRasterBlock *inputBlock = mInput->block( mBand, extent, width, height );
if ( !inputBlock || inputBlock->isEmpty() )
{
QgsDebugMsg( "No raster data!" );
delete inputBlock;
return outputBlock;
}
if ( !outputBlock->reset( QGis::ARGB32_Premultiplied, width, height ) )
{
delete inputBlock;
return outputBlock;
}
double cellXSize = extent.width() / double( width );
double cellYSize = extent.height() / double( height );
double zenithRad = qMax( 0.0, 90 - mLightAngle ) * M_PI / 180.0;
double azimuthRad = -1 * mLightAzimuth * M_PI / 180.0;
double cosZenithRad = cos( zenithRad );
double sinZenithRad = sin( zenithRad );
QRgb myDefaultColor = NODATA_COLOR;
for ( qgssize i = 0; i < ( qgssize )height; i++ )
{
for ( qgssize j = 0; j < ( qgssize )width; j++ )
{
if ( inputBlock->isNoData( i, j ) )
{
outputBlock->setColor( i, j, myDefaultColor );
continue;
}
qgssize iUp, iDown, jLeft, jRight;
if ( i == 0 )
{
iUp = i;
iDown = i + 1;
}
else if ( i < ( qgssize )height - 1 )
{
iUp = i - 1;
iDown = i + 1;
}
else
{
iUp = i - 1;
iDown = i;
}
if ( j == 0 )
{
jLeft = j;
jRight = j + 1;
}
else if ( j < ( qgssize )width - 1 )
{
jLeft = j - 1;
jRight = j + 1;
}
else
{
jLeft = j - 1;
jRight = j;
}
double x11;
double x21;
double x31;
double x12;
double x22; // Working cell
double x32;
double x13;
double x23;
double x33;
// This is center cell. It is not nodata. Use this in place of nodata neighbors
x22 = inputBlock->value( i, j );
x11 = inputBlock->isNoData( iUp, jLeft ) ? x22 : inputBlock->value( iUp, jLeft );
x21 = inputBlock->isNoData( i, jLeft ) ? x22 : inputBlock->value( i, jLeft );
x31 = inputBlock->isNoData( iDown, jLeft ) ? x22 : inputBlock->value( iDown, jLeft );
x12 = inputBlock->isNoData( iUp, j ) ? x22 : inputBlock->value( iUp, j );
// x22
x32 = inputBlock->isNoData( iDown, j ) ? x22 : inputBlock->value( iDown, j );
x13 = inputBlock->isNoData( iUp, jRight ) ? x22 : inputBlock->value( iUp, jRight );
x23 = inputBlock->isNoData( i, jRight ) ? x22 : inputBlock->value( i, jRight );
x33 = inputBlock->isNoData( iDown, jRight ) ? x22 : inputBlock->value( iDown, jRight );
double derX = calcFirstDerX( x11, x21, x31, x12, x22, x32, x13, x23, x33, cellXSize );
double derY = calcFirstDerY( x11, x21, x31, x12, x22, x32, x13, x23, x33, cellYSize );
double slope_rad = atan( mZFactor * sqrt( derX * derX + derY * derY ) );
double aspectRad = atan2( derX, -derY );
double colorvalue = qBound( 0.0, 255.0 * (( cosZenithRad * cos( slope_rad ) ) +
( sinZenithRad * sin( slope_rad ) *
cos( azimuthRad - aspectRad ) ) ), 255.0 );
outputBlock->setColor( i, j, qRgb( colorvalue, colorvalue, colorvalue ) );
}
}
return outputBlock;
}
