def __init__(self,
width,
height,
column_mapping=None,
style_file=None,
symbology=None,
parent=None):
"""
Parameters
----------
width: int
Width in pixels
height: int
Height in pixels
column_mapping: dict
Layer column mapping with the following keys:
- rock_code_column : name of the column which holds the rock code
- formation_code_column : name of the column which holds the formation code
- rock_description_column
- formation_description_column
style_file: str
File name of the QGIS style file to load
symbology: QDomDocument
QGIS style, as XML document
parent: QObject:
Qt parent object
"""
LogItem.__init__(self, parent)
self.__width = width
self.__height = height
self.__min_z = 0
self.__max_z = 100
self.__data = None
self.__layer = None
self.__column_mapping = column_mapping if column_mapping is not None else {}
# change current directory, so that relative paths to SVG get correctly resolved
os.chdir(os.path.dirname(__file__))
if style_file:
doc = QDomDocument()
doc.setContent(open(style_file, "r").read())
self.__renderer = QgsFeatureRenderer.load(doc.documentElement(),
QgsReadWriteContext())
elif symbology:
self.__renderer = QgsFeatureRenderer.load(
symbology.documentElement(), QgsReadWriteContext())
else:
self.__renderer = QgsFeatureRenderer.defaultRenderer(
POLYGON_RENDERER)
def __init__(self,
size=QSizeF(400, 200),
render_type=POINT_RENDERER,
x_orientation=ORIENTATION_LEFT_TO_RIGHT,
y_orientation=ORIENTATION_UPWARD,
allow_mouse_translation=False,
allow_wheel_zoom=False,
symbology=None,
parent=None):
"""
Parameters
----------
size: QSize
Size of the item
render_type: Literal[POINT_RENDERER, LINE_RENDERER, POLYGON_RENDERER]
Type of renderer
x_orientation: Literal[ORIENTATION_LEFT_TO_RIGHT, ORIENTATION_RIGHT_TO_LEFT]
y_orientation: Literal[ORIENTATION_UPWARD, ORIENTATION_DOWNWARD]
allow_mouse_translation: bool
Allow the user to translate the item with the mouse (??)
allow_wheel_zoom: bool
Allow the user to zoom with the mouse wheel
symbology: QDomDocument
QGIS symbology to use for the renderer
parent: QObject
"""
LogItem.__init__(self, parent)
self.__item_size = size
self.__data_rect = None
self.__data = None
self.__delta = None
self.__x_orientation = x_orientation
self.__y_orientation = y_orientation
# origin point of the graph translation, if any
self.__translation_orig = None
self.__render_type = render_type # type: Literal[POINT_RENDERER, LINE_RENDERER, POLYGON_RENDERER]
self.__allow_mouse_translation = allow_mouse_translation
self.__allow_wheel_zoom = allow_wheel_zoom
self.__layer = None
self.__default_renderers = [QgsFeatureRenderer.defaultRenderer(POINT_RENDERER),
QgsFeatureRenderer.defaultRenderer(LINE_RENDERER),
QgsFeatureRenderer.defaultRenderer(POLYGON_RENDERER)]
symbol = self.__default_renderers[1].symbol()
symbol.setWidth(1.0)
symbol = self.__default_renderers[0].symbol()
symbol.setSize(5.0)
symbol = self.__default_renderers[2].symbol()
symbol.symbolLayers()[0].setStrokeWidth(1.0)
if not symbology:
self.__renderer = self.__default_renderers[self.__render_type]
else:
self.__renderer = QgsFeatureRenderer.load(symbology.documentElement(), QgsReadWriteContext())
# index of the current point to label
self.__old_point_to_label = None
self.__point_to_label = None
def __init__(self,
layer,
column_mapping,
filter_expression=None,
size=QSizeF(400, 200),
render_type=POLYGON_RENDERER,
x_orientation=ORIENTATION_LEFT_TO_RIGHT,
y_orientation=ORIENTATION_UPWARD,
symbology=None,
parent=None):
"""
Parameters
----------
layer: QgsVectorLayer
Input vector layer
column_mapping: dict
Layer column mapping with the following keys:
- min_event_column : name of the column which holds the minimum x value
- max_event_column : name of the column which holds the maximum x value
- value_column : name of the column which holds the value
filter_expression: str
Filter expression to apply to the input layer
size: QSize
Size of the item
render_type: Literal[LINE_RENDERER, POLYGON_RENDERER]
Type of renderer
x_orientation: Literal[ORIENTATION_LEFT_TO_RIGHT, ORIENTATION_RIGHT_TO_LEFT]
y_orientation: Literal[ORIENTATION_UPWARD, ORIENTATION_DOWNWARD]
symbology: QDomDocument
QGIS symbology to use for the renderer
parent: QObject
"""
LogItem.__init__(self, parent)
self.__item_size = size
self.__data_rect = None
self.__data = None
self.__x_orientation = x_orientation
self.__y_orientation = y_orientation
if render_type not in (LINE_RENDERER, POLYGON_RENDERER):
raise RuntimeError(
"Render type not supported: {}".format(render_type))
self.__render_type = render_type # type: Literal[POINT_RENDERER, LINE_RENDERER, POLYGON_RENDERER]
self.__layer = layer
self.__column_mapping = column_mapping
self.__filter_expression = filter_expression
self.__default_renderers = [
None,
QgsFeatureRenderer.defaultRenderer(LINE_RENDERER),
QgsFeatureRenderer.defaultRenderer(POLYGON_RENDERER)
]
symbol = self.__default_renderers[1].symbol()
symbol.setWidth(1.0)
symbol = self.__default_renderers[2].symbol()
symbol.symbolLayers()[0].setStrokeWidth(1.0)
if not symbology:
self.__renderer = self.__default_renderers[self.__render_type]
else:
self.__renderer = QgsFeatureRenderer.load(
symbology.documentElement(), QgsReadWriteContext())
# values cache
self.__min_x_values = []
self.__max_x_values = []
self.__y_values = []
# index of the current point to label
self.__old_point_to_label = None
self.__point_to_label = None
# determine data window on loading
# FIXME we should use the database when possible
self.__min_x_field = column_mapping["min_event_column"]
self.__max_x_field = column_mapping["max_event_column"]
self.__y_field = column_mapping["value_column"]
req = QgsFeatureRequest()
req.setFilterExpression(filter_expression)
req.setSubsetOfAttributes(
[self.__min_x_field, self.__max_x_field, self.__y_field],
layer.fields())
min_x, max_x = None, None
min_y, max_y = None, None
for f in layer.getFeatures(req):
if min_x is None or f[self.__min_x_field] < min_x:
min_x = f[self.__min_x_field]
if max_x is None or f[self.__max_x_field] > max_x:
max_x = f[self.__max_x_field]
if min_y is None or f[self.__y_field] < min_y:
min_y = f[self.__y_field]
if max_y is None or f[self.__y_field] > max_y:
max_y = f[self.__y_field]
if min_x is None:
return
# Add a 10% buffer above max
h = max_y - min_y
if h == 0.0:
max_y = min_y + 1.0
h = 1.0
max_y += h * 0.1
self.set_data_window(QRectF(min_x, min_y, max_x - min_x,
max_y - min_y))