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from pyqtgraph.Qt import QtGui, QtCore
from .GraphicsObject import *
from .GraphicsWidgetAnchor import *
from .TextItem import TextItem
import numpy as np
import pyqtgraph.functions as fn
import pyqtgraph as pg
__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'):
GraphicsObject.__init__(self)
GraphicsWidgetAnchor.__init__(self)
self.setFlag(self.ItemHasNoContents)
self.setAcceptedMouseButtons(QtCore.Qt.NoButton)
if brush is None:
brush = pg.getConfigOption('foreground')
self.brush = fn.mkBrush(brush)
self.pen = fn.mkPen(pen)
self._width = width
self.size = size
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()
#class ScaleBar(UIGraphicsItem):
#"""
#Displays a rectangular bar with 10 divisions to indicate the relative scale of objects on the view.
#"""
#def __init__(self, size, width=5, color=(100, 100, 255)):
#UIGraphicsItem.__init__(self)
#self.setAcceptedMouseButtons(QtCore.Qt.NoButton)
#self.brush = fn.mkBrush(color)
#self.pen = fn.mkPen((0,0,0))
#self._width = width
#self.size = size
#def paint(self, p, opt, widget):
#UIGraphicsItem.paint(self, p, opt, widget)
#rect = self.boundingRect()
#unit = self.pixelSize()
#y = rect.top() + (rect.bottom()-rect.top()) * 0.02
#y1 = y + unit[1]*self._width
#x = rect.right() + (rect.left()-rect.right()) * 0.02
#x1 = x - self.size
#p.setPen(self.pen)
#p.setBrush(self.brush)
#rect = QtCore.QRectF(
#QtCore.QPointF(x1, y1),
#QtCore.QPointF(x, y)
#)
#p.translate(x1, y1)
#p.scale(rect.width(), rect.height())
#p.drawRect(0, 0, 1, 1)
#alpha = np.clip(((self.size/unit[0]) - 40.) * 255. / 80., 0, 255)
#p.setPen(QtGui.QPen(QtGui.QColor(0, 0, 0, alpha)))
#for i in range(1, 10):
##x2 = x + (x1-x) * 0.1 * i
#x2 = 0.1 * i
#p.drawLine(QtCore.QPointF(x2, 0), QtCore.QPointF(x2, 1))
#def setSize(self, s):
#self.size = s
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