Configurable GridItem tick spacing and pen color (#101)
This commit is contained in:
Jindřich Makovička
Ogi Moore
parent
584c4516f0
commit
bbc11b96a9
@ -3,6 +3,7 @@ from .UIGraphicsItem import *
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import numpy as np
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from ..Point import Point
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from .. import functions as fn
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from .. import getConfigOption
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__all__ = ['GridItem']
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class GridItem(UIGraphicsItem):
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@ -12,16 +13,75 @@ class GridItem(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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def __init__(self, pen='default', textPen='default'):
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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.opts = {}
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self.setPen(pen)
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self.setTextPen(textPen)
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self.setTickSpacing(x=[None, None, None], y=[None, None, None])
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def setPen(self, *args, **kwargs):
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"""Set the pen used to draw the grid."""
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if kwargs == {} and (args == () or args == ('default',)):
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self.opts['pen'] = fn.mkPen(getConfigOption('foreground'))
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else:
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self.opts['pen'] = fn.mkPen(*args, **kwargs)
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self.picture = None
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self.update()
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def setTextPen(self, *args, **kwargs):
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"""Set the pen used to draw the texts."""
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if kwargs == {} and (args == () or args == ('default',)):
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self.opts['textPen'] = fn.mkPen(getConfigOption('foreground'))
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else:
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if args == (None,):
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self.opts['textPen'] = None
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else:
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self.opts['textPen'] = fn.mkPen(*args, **kargs)
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self.picture = None
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self.update()
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def setTickSpacing(self, x=None, y=None):
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"""
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Set the grid tick spacing to use.
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Tick spacing for each axis shall be specified as an array of
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descending values, one for each tick scale. When the value
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is set to None, grid line distance is chosen automatically
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for this particular level.
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Example:
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Default setting of 3 scales for each axis:
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setTickSpacing(x=[None, None, None], y=[None, None, None])
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Single scale with distance of 1.0 for X axis, Two automatic
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scales for Y axis:
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setTickSpacing(x=[1.0], y=[None, None])
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Single scale with distance of 1.0 for X axis, Two scales
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for Y axis, one with spacing of 1.0, other one automatic:
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setTickSpacing(x=[1.0], y=[1.0, None])
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"""
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self.opts['tickSpacing'] = (x or self.opts['tickSpacing'][0],
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y or self.opts['tickSpacing'][1])
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self.grid_depth = max([len(s) for s in self.opts['tickSpacing']])
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self.picture = None
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self.update()
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def viewRangeChanged(self):
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UIGraphicsItem.viewRangeChanged(self)
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self.picture = None
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@ -48,7 +108,6 @@ class GridItem(UIGraphicsItem):
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p = QtGui.QPainter()
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p.begin(self.picture)
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dt = fn.invertQTransform(self.viewTransform())
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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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@ -62,10 +121,22 @@ class GridItem(UIGraphicsItem):
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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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lastd = [None, None]
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for i in range(self.grid_depth - 1, -1, -1):
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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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for ax in range(0,2):
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ts = self.opts['tickSpacing'][ax]
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try:
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if ts[i] is not None:
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d[ax] = ts[i]
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except IndexError:
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pass
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lastd[ax] = d[ax]
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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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@ -76,12 +147,25 @@ class GridItem(UIGraphicsItem):
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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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if i >= len(self.opts['tickSpacing'][ax]):
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continue
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if d[ax] < lastd[ax]:
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continue
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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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c = np.clip(5.*(ppl-3), 0., 50.)
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linePen = self.opts['pen']
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lineColor = self.opts['pen'].color()
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lineColor.setAlpha(c)
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linePen.setColor(lineColor)
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textPen = self.opts['textPen']
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if textPen is not None:
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textColor = self.opts['textPen'].color()
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textColor.setAlpha(c * 2)
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textPen.setColor(textColor)
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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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@ -102,8 +186,7 @@ class GridItem(UIGraphicsItem):
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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 i < 2 and textPen is not None:
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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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@ -114,7 +197,13 @@ class GridItem(UIGraphicsItem):
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tr = self.deviceTransform()
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#tr.scale(1.5, 1.5)
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p.setWorldTransform(fn.invertQTransform(tr))
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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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if textPen is not None and len(texts) > 0:
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# if there is at least one text, then c is set
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textColor.setAlpha(c * 2)
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p.setPen(QtGui.QPen(textColor))
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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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