Class: QgsSvgCache

class qgis.core.QgsSvgCache(parent: QObject = None)

Bases: qgis._core.QgsAbstractContentCacheBase

Constructor for QgsSvgCache.

A cache for images / pictures derived from svg files. This class supports parameter replacement in svg files according to the svg params specification (http://www.w3.org/TR/2009/WD-SVGParamPrimer-20090616/). Supported are the parameters ‘fill-color’, ‘pen-color’, ‘outline-width’, ‘stroke-width’. E.g. <circle fill=”param(fill-color red)” stroke=”param(pen-color black)” stroke-width=”param(outline-width 1)”

QgsSvgCache is not usually directly created, but rather accessed through QgsApplication.svgCache()

Enums

Methods

checkReply
childEvent
connectNotify
containsParams Tests if an svg file contains parameters for fill, stroke color, stroke width.
containsParamsV3 Tests if an svg file contains parameters for fill, stroke color, stroke width.
customEvent
disconnectNotify
getImageData Gets image data
isSignalConnected
onRemoteContentFetched
receivers
sender
senderSignalIndex
svgAsImage Gets SVG as QImage.
svgAsPicture Gets SVG as QPicture&.
svgContent Gets SVG content
svgViewboxSize Calculates the viewbox size of a (possibly cached) SVG file.
timerEvent

Signals

remoteSvgFetched Emitted when the cache has finished retrieving an SVG file from a remote url.
statusChanged Emit a signal to be caught by qgisapp and display a msg on status bar.

Attributes

checkReply(self, reply: QNetworkReply, path: str) → bool
childEvent()
connectNotify()
containsParams(self, path: str, defaultFillColor: Union[QColor, Qt.GlobalColor], defaultStrokeColor: Union[QColor, Qt.GlobalColor]) → Tuple[bool, bool, bool, float]

Tests if an svg file contains parameters for fill, stroke color, stroke width. If yes, possible default values are returned. If there are several default values in the svg file, only the first one is considered*

containsParamsV3(self, path: str, defaultFillColor: Union[QColor, Qt.GlobalColor], defaultStrokeColor: Union[QColor, Qt.GlobalColor]) → Tuple[bool, bool, bool, bool, float, bool, bool, bool, bool, float, bool, bool, float]

Tests if an svg file contains parameters for fill, stroke color, stroke width. If yes, possible default values are returned. If there are several default values in the svg file, only the first one is considered.

Parameters:
  • path – path to SVG file
  • hasFillParam – will be True if fill param present in SVG
  • hasDefaultFillParam – will be True if fill param has a default value specified
  • defaultFillColor – will be set to default fill color specified in SVG, if present
  • hasFillOpacityParam – will be True if fill opacity param present in SVG
  • hasDefaultFillOpacity – will be True if fill opacity param has a default value specified
  • defaultFillOpacity – will be set to default fill opacity specified in SVG, if present
  • hasStrokeParam – will be True if stroke param present in SVG
  • hasDefaultStrokeColor – will be True if stroke param has a default value specified
  • defaultStrokeColor – will be set to default stroke color specified in SVG, if present
  • hasStrokeWidthParam – will be True if stroke width param present in SVG
  • hasDefaultStrokeWidth – will be True if stroke width param has a default value specified
  • defaultStrokeWidth – will be set to default stroke width specified in SVG, if present
  • hasStrokeOpacityParam – will be True if stroke opacity param present in SVG
  • hasDefaultStrokeOpacity – will be True if stroke opacity param has a default value specified
  • defaultStrokeOpacity – will be set to default stroke opacity specified in SVG, if present

Note

available in Python bindings as containsParamsV3

New in version 2.14.

customEvent()
disconnectNotify()
getImageData(self, path: str) → QByteArray

Gets image data

isSignalConnected()
onRemoteContentFetched()
receivers()
remoteSvgFetched

Emitted when the cache has finished retrieving an SVG file from a remote url.

New in version 3.2: [signal]

sender()
senderSignalIndex()
statusChanged

Emit a signal to be caught by qgisapp and display a msg on status bar.

Deprecated since version Deprecated: since QGIS 3.6 – no longer emitted. [signal]

svgAsImage(self, path: str, size: float, fill: Union[QColor, Qt.GlobalColor], stroke: Union[QColor, Qt.GlobalColor], strokeWidth: float, widthScaleFactor: float, fixedAspectRatio: float = 0) → Tuple[QImage, bool]

Gets SVG as QImage.

Parameters:
  • path – Absolute path to SVG file.
  • size – size of cached image
  • fill – color of fill
  • stroke – color of stroke
  • strokeWidth – width of stroke
  • widthScaleFactor – width scale factor
  • fitsInCache
  • fixedAspectRatio – fixed aspect ratio (optional)
svgAsPicture(self, path: str, size: float, fill: Union[QColor, Qt.GlobalColor], stroke: Union[QColor, Qt.GlobalColor], strokeWidth: float, widthScaleFactor: float, forceVectorOutput: bool = False, fixedAspectRatio: float = 0) → QPicture

Gets SVG as QPicture&.

Parameters:
  • path – Absolute path to SVG file.
  • size – size of cached image
  • fill – color of fill
  • stroke – color of stroke
  • strokeWidth – width of stroke
  • widthScaleFactor – width scale factor
  • forceVectorOutput
  • fixedAspectRatio – fixed aspect ratio (optional)
svgContent(self, path: str, size: float, fill: Union[QColor, Qt.GlobalColor], stroke: Union[QColor, Qt.GlobalColor], strokeWidth: float, widthScaleFactor: float, fixedAspectRatio: float = 0) → QByteArray

Gets SVG content

svgViewboxSize(self, path: str, size: float, fill: Union[QColor, Qt.GlobalColor], stroke: Union[QColor, Qt.GlobalColor], strokeWidth: float, widthScaleFactor: float, fixedAspectRatio: float = 0) → QSizeF

Calculates the viewbox size of a (possibly cached) SVG file.

Parameters:
  • path – Absolute path to SVG file.
  • size – size of cached image
  • fill – color of fill
  • stroke – color of stroke
  • strokeWidth – width of stroke
  • widthScaleFactor – width scale factor
  • fixedAspectRatio – fixed aspect ratio (optional)
Returns:

viewbox size set in SVG file

New in version 2.14.

timerEvent()