Source code for pyqtgraph.graphicsItems.GridItem

import numpy as np

from .. import functions as fn
from .. import getConfigOption
from ..Point import Point
from ..Qt import QtCore, QtGui
from .UIGraphicsItem import *

__all__ = ['GridItem']
[docs]class GridItem(UIGraphicsItem): """ **Bases:** :class:`UIGraphicsItem <pyqtgraph.UIGraphicsItem>` Displays a rectangular grid of lines indicating major divisions within a coordinate system. Automatically determines what divisions to use. """
[docs] def __init__(self, pen='default', textPen='default'): UIGraphicsItem.__init__(self) #QtWidgets.QGraphicsItem.__init__(self, *args) #self.setFlag(QtWidgets.QGraphicsItem.GraphicsItemFlag.ItemClipsToShape) #self.setCacheMode(QtWidgets.QGraphicsItem.CacheMode.DeviceCoordinateCache) self.opts = {} self.setPen(pen) self.setTextPen(textPen) self.setTickSpacing(x=[None, None, None], y=[None, None, None])
[docs] def setPen(self, *args, **kwargs): """Set the pen used to draw the grid.""" if kwargs == {} and (args == () or args == ('default',)): self.opts['pen'] = fn.mkPen(getConfigOption('foreground')) else: self.opts['pen'] = fn.mkPen(*args, **kwargs) self.picture = None self.update()
[docs] def setTextPen(self, *args, **kwargs): """Set the pen used to draw the texts.""" if kwargs == {} and (args == () or args == ('default',)): self.opts['textPen'] = fn.mkPen(getConfigOption('foreground')) else: if args == (None,): self.opts['textPen'] = None else: self.opts['textPen'] = fn.mkPen(*args, **kwargs) self.picture = None self.update()
[docs] def setTickSpacing(self, x=None, y=None): """ Set the grid tick spacing to use. Tick spacing for each axis shall be specified as an array of descending values, one for each tick scale. When the value is set to None, grid line distance is chosen automatically for this particular level. Example: Default setting of 3 scales for each axis: setTickSpacing(x=[None, None, None], y=[None, None, None]) Single scale with distance of 1.0 for X axis, Two automatic scales for Y axis: setTickSpacing(x=[1.0], y=[None, None]) Single scale with distance of 1.0 for X axis, Two scales for Y axis, one with spacing of 1.0, other one automatic: setTickSpacing(x=[1.0], y=[1.0, None]) """ self.opts['tickSpacing'] = (x or self.opts['tickSpacing'][0], y or self.opts['tickSpacing'][1]) self.grid_depth = max([len(s) for s in self.opts['tickSpacing']]) self.picture = None self.update()
def viewRangeChanged(self): UIGraphicsItem.viewRangeChanged(self) self.picture = None #UIGraphicsItem.viewRangeChanged(self) #self.update() def paint(self, p, opt, widget): #p.setPen(QtGui.QPen(QtGui.QColor(100, 100, 100))) #p.drawRect(self.boundingRect()) #UIGraphicsItem.paint(self, p, opt, widget) ### draw picture if self.picture is None: #print "no pic, draw.." self.generatePicture() p.drawPicture(QtCore.QPointF(0, 0), self.picture) #p.setPen(QtGui.QPen(QtGui.QColor(255,0,0))) #p.drawLine(0, -100, 0, 100) #p.drawLine(-100, 0, 100, 0) #print "drawing Grid." def generatePicture(self): self.picture = QtGui.QPicture() p = QtGui.QPainter() p.begin(self.picture) vr = self.getViewWidget().rect() unit = self.pixelWidth(), self.pixelHeight() dim = [vr.width(), vr.height()] lvr = self.boundingRect() ul = np.array([lvr.left(), lvr.top()]) br = np.array([lvr.right(), lvr.bottom()]) texts = [] if ul[1] > br[1]: x = ul[1] ul[1] = br[1] br[1] = x lastd = [None, None] for i in range(self.grid_depth - 1, -1, -1): dist = br-ul nlTarget = 10.**i d = 10. ** np.floor(np.log10(np.abs(dist/nlTarget))+0.5) for ax in range(0,2): ts = self.opts['tickSpacing'][ax] try: if ts[i] is not None: d[ax] = ts[i] except IndexError: pass lastd[ax] = d[ax] ul1 = np.floor(ul / d) * d br1 = np.ceil(br / d) * d dist = br1-ul1 nl = (dist / d) + 0.5 for ax in range(0,2): ## Draw grid for both axes if i >= len(self.opts['tickSpacing'][ax]): continue if d[ax] < lastd[ax]: continue ppl = dim[ax] / nl[ax] c = int(fn.clip_scalar(5 * (ppl-3), 0, 50)) linePen = self.opts['pen'] lineColor = self.opts['pen'].color() lineColor.setAlpha(c) linePen.setColor(lineColor) textPen = self.opts['textPen'] if textPen is not None: textColor = self.opts['textPen'].color() textColor.setAlpha(c * 2) textPen.setColor(textColor) bx = (ax+1) % 2 for x in range(0, int(nl[ax])): linePen.setCosmetic(True) p.setPen(linePen) p1 = np.array([0.,0.]) p2 = np.array([0.,0.]) p1[ax] = ul1[ax] + x * d[ax] p2[ax] = p1[ax] p1[bx] = ul[bx] p2[bx] = br[bx] ## don't draw lines that are out of bounds. if p1[ax] < min(ul[ax], br[ax]) or p1[ax] > max(ul[ax], br[ax]): continue p.drawLine(QtCore.QPointF(p1[0], p1[1]), QtCore.QPointF(p2[0], p2[1])) if i < 2 and textPen is not None: if ax == 0: x = p1[0] + unit[0] y = ul[1] + unit[1] * 8. else: x = ul[0] + unit[0]*3 y = p1[1] + unit[1] texts.append((QtCore.QPointF(x, y), "%g"%p1[ax])) tr = self.deviceTransform() p.setWorldTransform(fn.invertQTransform(tr)) if textPen is not None and len(texts) > 0: # if there is at least one text, then c is set textColor.setAlpha(c * 2) p.setPen(QtGui.QPen(textColor)) for t in texts: x = tr.map(t[0]) + Point(0.5, 0.5) p.drawText(x, t[1]) p.end()