mirror of
https://github.com/Athemis/PyDSF.git
synced 2025-04-06 23:16:03 +00:00
71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
from ..Qt import QtGui, QtCore
|
|
from .GraphicsObject import *
|
|
from .GraphicsWidgetAnchor import *
|
|
from .TextItem import TextItem
|
|
import numpy as np
|
|
from .. import functions as fn
|
|
from .. import getConfigOption
|
|
from ..Point import Point
|
|
|
|
__all__ = ['ScaleBar']
|
|
|
|
class ScaleBar(GraphicsObject, GraphicsWidgetAnchor):
|
|
"""
|
|
Displays a rectangular bar to indicate the relative scale of objects on the view.
|
|
"""
|
|
def __init__(self, size, width=5, brush=None, pen=None, suffix='m', offset=None):
|
|
GraphicsObject.__init__(self)
|
|
GraphicsWidgetAnchor.__init__(self)
|
|
self.setFlag(self.ItemHasNoContents)
|
|
self.setAcceptedMouseButtons(QtCore.Qt.NoButton)
|
|
|
|
if brush is None:
|
|
brush = getConfigOption('foreground')
|
|
self.brush = fn.mkBrush(brush)
|
|
self.pen = fn.mkPen(pen)
|
|
self._width = width
|
|
self.size = size
|
|
if offset == None:
|
|
offset = (0,0)
|
|
self.offset = offset
|
|
|
|
self.bar = QtGui.QGraphicsRectItem()
|
|
self.bar.setPen(self.pen)
|
|
self.bar.setBrush(self.brush)
|
|
self.bar.setParentItem(self)
|
|
|
|
self.text = TextItem(text=fn.siFormat(size, suffix=suffix), anchor=(0.5,1))
|
|
self.text.setParentItem(self)
|
|
|
|
def parentChanged(self):
|
|
view = self.parentItem()
|
|
if view is None:
|
|
return
|
|
view.sigRangeChanged.connect(self.updateBar)
|
|
self.updateBar()
|
|
|
|
|
|
def updateBar(self):
|
|
view = self.parentItem()
|
|
if view is None:
|
|
return
|
|
p1 = view.mapFromViewToItem(self, QtCore.QPointF(0,0))
|
|
p2 = view.mapFromViewToItem(self, QtCore.QPointF(self.size,0))
|
|
w = (p2-p1).x()
|
|
self.bar.setRect(QtCore.QRectF(-w, 0, w, self._width))
|
|
self.text.setPos(-w/2., 0)
|
|
|
|
def boundingRect(self):
|
|
return QtCore.QRectF()
|
|
|
|
def setParentItem(self, p):
|
|
ret = GraphicsObject.setParentItem(self, p)
|
|
if self.offset is not None:
|
|
offset = Point(self.offset)
|
|
anchorx = 1 if offset[0] <= 0 else 0
|
|
anchory = 1 if offset[1] <= 0 else 0
|
|
anchor = (anchorx, anchory)
|
|
self.anchor(itemPos=anchor, parentPos=anchor, offset=offset)
|
|
return ret
|
|
|
|
|