51 lines
1.6 KiB
Python
51 lines
1.6 KiB
Python
from pyqtgraph.Qt import QtGui, QtCore
|
|
from .UIGraphicsItem import *
|
|
import numpy as np
|
|
import pyqtgraph.functions as fn
|
|
|
|
__all__ = ['ScaleBar']
|
|
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
|
|
|