def updateMainViewBox(self, srcview=None):
if not self.graphicsview.scene():
return
if not srcview:
# @TODO: check API
srcview = self.app.currentGraphicsView()
elif srcview is not self.app.currentGraphicsView():
# current view not yet updated: do nothing
return
if srcview:
assert srcview.scene() == self.graphicsview.scene() # @TODO: check
hbar = srcview.horizontalScrollBar()
vbar = srcview.verticalScrollBar()
# @TODO: bug report: mapping to scene seems to introduce a
# spurious offset "x1 = 2*x0" and y1 = 2*y0;
# this doesn't happen for "w" and "h"
#polygon = srcview.mapToScene(hbar.value(), vbar.value(),
# hbar.pageStep(), vbar.pageStep())
#@TODO: in case of rotations it should be better keep using
# a polygon
#self.graphicsview.viewbox = polygon.boundingRect()
# @NOTE: this is a workaround; mapToScene should be used instead
rect = QtCore.QRectF(hbar.value(), vbar.value(), hbar.pageStep(),
vbar.pageStep())
transform = srcview.transform().inverted()[0]
self.graphicsview.viewbox = transform.mapRect(rect)
def __init__(self, gdalobj, parent=None, **kwargs):
super(BaseGdalGraphicsItem, self).__init__(parent, **kwargs)
# @COMPATIBILITY: Qt >= 4.6.0 needs this flag to be set otherwise the
# exact exposedRect is not computed
# @SEEALSO: ItemUsesExtendedStyleOption item at
# http://doc.qt.nokia.com/4.6/qgraphicsitem.html#GraphicsItemFlag-enum
try:
self.setFlag(QtWidgets.QGraphicsItem.ItemUsesExtendedStyleOptions)
except AttributeError:
self.setFlag(QtWidgets.QGraphicsItem.GraphicsItemFlag(0x200))
self.gdalobj = gdalobj
try:
# dataset
w = gdalobj.RasterXSize
h = gdalobj.RasterYSize
except AttributeError:
# raster band
w = gdalobj.XSize
h = gdalobj.YSize
self._boundingRect = QtCore.QRectF(0, 0, w, h)
#self.read_threshold = 1600*1200
self.stretch = imgutils.LinearStretcher()
# @TODO: use lazy gaphicsitem initialization
# @TODO: initialize stretching explicitly
self._stretch_initialized = False
self._data_preproc = None
self.colortable = None
def sceneEventFilter(self, obj, event):
if event.type() == QtCore.QEvent.GraphicsSceneMouseRelease:
p0 = event.buttonDownScenePos(QtCore.Qt.LeftButton)
p1 = event.scenePos()
rect = QtCore.QRectF(p0, p1).normalized()
self.rubberBandSeclection.emit(rect)
return True
#return obj.eventFilter(obj, event) # @TODO: check
#return QtWidgets.QGraphicsScene.eventFilter(self, obj, event)
return False
