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"""
Returns a hint for a SpatialExtent, derived from the first raster layer
:return: SpatialExtent
"""
layers = self.layers()
if len(layers) > 0:
e = self.fullExtent()
ext = SpatialExtent(crs, e)
else:
ext = SpatialExtent.world()
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class CanvasBoundingBoxItem(QgsGeometryRubberBand):
def __init__(self, mapCanvas):
assert isinstance(mapCanvas, QgsMapCanvas)
super(CanvasBoundingBoxItem, self).__init__(mapCanvas)
self.canvas = mapCanvas
self.mCanvasExtents = dict()
self.mShow = True
self.mShowTitles = True
self.setIconType(QgsGeometryRubberBand.ICON_NONE)
def connectCanvas(self, canvas):
assert isinstance(canvas, QgsMapCanvas)
assert canvas != self.canvas
if canvas not in self.mCanvasExtents.keys():
self.mCanvasExtents[canvas] = None
canvas.extentsChanged.connect(lambda : self.onExtentsChanged(canvas))
canvas.destroyed.connect(lambda : self.disconnectCanvas(canvas))
self.onExtentsChanged(canvas)
def disconnectCanvas(self, canvas):
self.mCanvasExtents.pop(canvas)
def onExtentsChanged(self, canvas):
assert isinstance(canvas, QgsMapCanvas)
ext = SpatialExtent.fromMapCanvas(canvas)
ext = ext.toCrs(self.canvas.mapSettings().destinationCrs())
assert geom.fromWkt(ext.asWktPolygon())
self.mCanvasExtents[canvas] = (ext, geom)
self.refreshExtents()
def refreshExtents(self):
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if self.mShow:
for canvas, t in self.mCanvasExtents.items():
ext, geom = t
multi.addGeometry(geom.clone())
self.setGeometry(multi)
def paint(self, painter, QStyleOptionGraphicsItem=None, QWidget_widget=None):
super(CanvasBoundingBoxItem, self).paint(painter)
if self.mShowTitles and self.mShow:
painter.setPen(Qt.blue);
painter.setFont(QFont("Arial", 30))
for canvas, t in self.mCanvasExtents.items():
ext, geom = t
ULpx = self.toCanvasCoordinates(ext.center())
txt = canvas.windowTitle()
painter.drawLine(0, 0, 200, 200);
painter.drawText(ULpx, txt)
def setShow(self, b):
assert isinstance(b, bool)
self.mShow = b
def setShowTitles(self, b):
assert isinstance(b, bool)
self.mShowTitles = b