119 lines
4.4 KiB
Python
119 lines
4.4 KiB
Python
from pyqtgraph.Qt import QtGui, QtCore
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from UIGraphicsItem import *
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import numpy as np
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from pyqtgraph.Point import Point
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__all__ = ['GridItem']
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class GridItem(UIGraphicsItem):
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"""
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**Bases:** :class:`UIGraphicsItem <pyqtgraph.UIGraphicsItem>`
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Displays a rectangular grid of lines indicating major divisions within a coordinate system.
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Automatically determines what divisions to use.
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"""
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def __init__(self):
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UIGraphicsItem.__init__(self)
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#QtGui.QGraphicsItem.__init__(self, *args)
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#self.setFlag(QtGui.QGraphicsItem.ItemClipsToShape)
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#self.setCacheMode(QtGui.QGraphicsItem.DeviceCoordinateCache)
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self.picture = None
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def viewChangedEvent(self):
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self.picture = None
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#UIGraphicsItem.viewRangeChanged(self)
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#self.update()
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def paint(self, p, opt, widget):
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#p.setPen(QtGui.QPen(QtGui.QColor(100, 100, 100)))
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#p.drawRect(self.boundingRect())
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#UIGraphicsItem.paint(self, p, opt, widget)
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### draw picture
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if self.picture is None:
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#print "no pic, draw.."
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self.generatePicture()
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p.drawPicture(QtCore.QPointF(0, 0), self.picture)
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#p.setPen(QtGui.QPen(QtGui.QColor(255,0,0)))
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#p.drawLine(0, -100, 0, 100)
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#p.drawLine(-100, 0, 100, 0)
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#print "drawing Grid."
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def generatePicture(self):
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self.picture = QtGui.QPicture()
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p = QtGui.QPainter()
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p.begin(self.picture)
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dt = self.viewTransform().inverted()[0]
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vr = self.getViewWidget().rect()
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unit = self.pixelWidth(), self.pixelHeight()
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dim = [vr.width(), vr.height()]
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lvr = self.boundingRect()
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ul = np.array([lvr.left(), lvr.top()])
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br = np.array([lvr.right(), lvr.bottom()])
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texts = []
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if ul[1] > br[1]:
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x = ul[1]
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ul[1] = br[1]
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br[1] = x
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for i in [2,1,0]: ## Draw three different scales of grid
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dist = br-ul
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nlTarget = 10.**i
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d = 10. ** np.floor(np.log10(abs(dist/nlTarget))+0.5)
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ul1 = np.floor(ul / d) * d
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br1 = np.ceil(br / d) * d
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dist = br1-ul1
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nl = (dist / d) + 0.5
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#print "level", i
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#print " dim", dim
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#print " dist", dist
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#print " d", d
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#print " nl", nl
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for ax in range(0,2): ## Draw grid for both axes
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ppl = dim[ax] / nl[ax]
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c = np.clip(3.*(ppl-3), 0., 30.)
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linePen = QtGui.QPen(QtGui.QColor(255, 255, 255, c))
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textPen = QtGui.QPen(QtGui.QColor(255, 255, 255, c*2))
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#linePen.setCosmetic(True)
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#linePen.setWidth(1)
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bx = (ax+1) % 2
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for x in range(0, int(nl[ax])):
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linePen.setCosmetic(False)
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if ax == 0:
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linePen.setWidthF(self.pixelWidth())
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#print "ax 0 height", self.pixelHeight()
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else:
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linePen.setWidthF(self.pixelHeight())
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#print "ax 1 width", self.pixelWidth()
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p.setPen(linePen)
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p1 = np.array([0.,0.])
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p2 = np.array([0.,0.])
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p1[ax] = ul1[ax] + x * d[ax]
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p2[ax] = p1[ax]
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p1[bx] = ul[bx]
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p2[bx] = br[bx]
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## don't draw lines that are out of bounds.
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if p1[ax] < min(ul[ax], br[ax]) or p1[ax] > max(ul[ax], br[ax]):
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continue
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p.drawLine(QtCore.QPointF(p1[0], p1[1]), QtCore.QPointF(p2[0], p2[1]))
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if i < 2:
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p.setPen(textPen)
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if ax == 0:
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x = p1[0] + unit[0]
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y = ul[1] + unit[1] * 8.
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else:
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x = ul[0] + unit[0]*3
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y = p1[1] + unit[1]
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texts.append((QtCore.QPointF(x, y), "%g"%p1[ax]))
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tr = self.deviceTransform()
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#tr.scale(1.5, 1.5)
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p.setWorldTransform(tr.inverted()[0])
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for t in texts:
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x = tr.map(t[0]) + Point(0.5, 0.5)
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p.drawText(x, t[1])
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p.end()
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