QGIS API Documentation
3.16.0-Hannover (43b64b13f3)
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23 #include <QCoreApplication>
24 #include <QDomDocument>
25 #include <QDomElement>
66 if ( !
input )
return false;
106 if ( rasterRendererElem.isNull() )
111 rasterRendererElem.setAttribute( QStringLiteral(
"type" ),
mType );
112 rasterRendererElem.setAttribute( QStringLiteral(
"opacity" ), QString::number(
mOpacity ) );
113 rasterRendererElem.setAttribute( QStringLiteral(
"alphaBand" ),
mAlphaBand );
121 QDomElement minMaxOriginElem = doc.createElement( QStringLiteral(
"minMaxOrigin" ) );
123 rasterRendererElem.appendChild( minMaxOriginElem );
128 if ( !mNodataColor.isValid() )
131 return mNodataColor.rgba();
136 if ( rendererElem.isNull() )
141 mType = rendererElem.attribute( QStringLiteral(
"type" ) );
142 mOpacity = rendererElem.attribute( QStringLiteral(
"opacity" ), QStringLiteral(
"1.0" ) ).toDouble();
143 mAlphaBand = rendererElem.attribute( QStringLiteral(
"alphaBand" ), QStringLiteral(
"-1" ) ).toInt();
144 const QString colorEncoded = rendererElem.attribute( QStringLiteral(
"nodataColor" ) );
147 QDomElement rasterTransparencyElem = rendererElem.firstChildElement( QStringLiteral(
"rasterTransparency" ) );
148 if ( !rasterTransparencyElem.isNull() )
155 QDomElement minMaxOriginElem = rendererElem.firstChildElement( QStringLiteral(
"minMaxOrigin" ) );
156 if ( !minMaxOriginElem.isNull() )
171 if ( copyMinMaxOrigin )
177 QDomElement rasterSymbolizerElem = doc.createElement( QStringLiteral(
"sld:RasterSymbolizer" ) );
178 element.appendChild( rasterSymbolizerElem );
183 QDomElement opacityElem = doc.createElement( QStringLiteral(
"sld:Opacity" ) );
184 opacityElem.appendChild( doc.createTextNode( QString::number(
opacity() ) ) );
185 rasterSymbolizerElem.appendChild( opacityElem );
static QString encodeColor(const QColor &color)
DataType
Raster data types.
void writeXml(QDomDocument &doc, QDomElement &parentElem) const
Writes the transparency information to an XML document.
void setRasterTransparency(QgsRasterTransparency *t)
void writeXml(QDomDocument &doc, QDomElement &parentElem) const
Serialize object.
bool isEmpty() const
True if there are no entries in the pixel lists except the nodata value.
const QgsRasterMinMaxOrigin & minMaxOrigin() const
Returns const reference to origin of min/max values.
QgsRasterInterface * mInput
#define QgsDebugMsgLevel(str, level)
static bool typeIsNumeric(Qgis::DataType type)
Returns true if data type is numeric.
QgsRasterRenderer(QgsRasterInterface *input=nullptr, const QString &type=QString())
Constructor for QgsRasterRenderer.
virtual bool accept(QgsStyleEntityVisitorInterface *visitor) const
Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer...
QColor nodataColor() const
Returns the color to use for shading nodata pixels.
void readXml(const QDomElement &elem)
Deserialize object.
An interface for classes which can visit style entity (e.g.
virtual void toSld(QDomDocument &doc, QDomElement &element, const QgsStringMap &props=QgsStringMap()) const
Used from subclasses to create SLD Rule elements following SLD v1.0 specs.
static QColor decodeColor(const QString &str)
static const QRgb NODATA_COLOR
bool setInput(QgsRasterInterface *input) override
Set input.
QgsRasterMinMaxOrigin mMinMaxOrigin
Origin of min/max values.
Raster renderer pipe that applies colors to a raster.
const QgsRasterTransparency * rasterTransparency() const
virtual Qgis::DataType dataType(int bandNo) const =0
Returns data type for the band specified by number.
bool qgsDoubleNear(double a, double b, double epsilon=4 *std::numeric_limits< double >::epsilon())
Compare two doubles (but allow some difference)
QgsRasterTransparency * mRasterTransparency
Raster transparency per color or value. Overwrites global alpha value.
void setAlphaBand(int band)
void readXml(const QDomElement &rendererElem) override
Sets base class members from xml. Usually called from create() methods of subclasses.
void _writeXml(QDomDocument &doc, QDomElement &rasterRendererElem) const
Write upper class info into rasterrenderer element (called by writeXml method of subclasses)
void copyCommonProperties(const QgsRasterRenderer *other, bool copyMinMaxOrigin=true)
Copies common properties like opacity / transparency data from other renderer.
bool usesTransparency() const
~QgsRasterRenderer() override
Defines the list of pixel values to be considered as transparent or semi transparent when rendering r...
void readXml(const QDomElement &elem)
Reads the transparency information from an XML document.
int mAlphaBand
Read alpha value from band.
int bandCount() const override
Gets number of bands.
Qgis::DataType dataType(int bandNo) const override
Returns data type for the band specified by number.
void setMinMaxOrigin(const QgsRasterMinMaxOrigin &origin)
Sets origin of min/max values.
QMap< QString, QString > QgsStringMap
@ ARGB32_Premultiplied
Color, alpha, red, green, blue, 4 bytes the same as QImage::Format_ARGB32_Premultiplied.
Base class for processing filters like renderers, reprojector, resampler etc.
QRgb renderColorForNodataPixel() const
Returns the color for the renderer to use to represent nodata pixels.
virtual QgsRasterInterface * input() const
Current input.
double mOpacity
Global alpha value (0-1)
void setNodataColor(const QColor &color)
Sets the color to use for shading nodata pixels.
@ UnknownDataType
Unknown or unspecified type.
virtual int bandCount() const =0
Gets number of bands.
void setOpacity(double opacity)
Sets the opacity for the renderer, where opacity is a value between 0 (totally transparent) and 1....
double opacity() const
Returns the opacity for the renderer, where opacity is a value between 0 (totally transparent) and 1....