Configurable GridItem tick spacing and pen color (#101)

This commit is contained in:
Jindřich Makovička 2019-09-12 23:50:43 +02:00 committed by Ogi Moore
parent 584c4516f0
commit bbc11b96a9

View File

@ -3,6 +3,7 @@ from .UIGraphicsItem import *
import numpy as np
from ..Point import Point
from .. import functions as fn
from .. import getConfigOption
__all__ = ['GridItem']
class GridItem(UIGraphicsItem):
@ -13,13 +14,72 @@ class GridItem(UIGraphicsItem):
Automatically determines what divisions to use.
"""
def __init__(self):
def __init__(self, pen='default', textPen='default'):
UIGraphicsItem.__init__(self)
#QtGui.QGraphicsItem.__init__(self, *args)
#self.setFlag(QtGui.QGraphicsItem.ItemClipsToShape)
#self.setCacheMode(QtGui.QGraphicsItem.DeviceCoordinateCache)
self.opts = {}
self.setPen(pen)
self.setTextPen(textPen)
self.setTickSpacing(x=[None, None, None], y=[None, None, None])
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()
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, **kargs)
self.picture = None
self.update()
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):
@ -48,7 +108,6 @@ class GridItem(UIGraphicsItem):
p = QtGui.QPainter()
p.begin(self.picture)
dt = fn.invertQTransform(self.viewTransform())
vr = self.getViewWidget().rect()
unit = self.pixelWidth(), self.pixelHeight()
dim = [vr.width(), vr.height()]
@ -62,10 +121,22 @@ class GridItem(UIGraphicsItem):
x = ul[1]
ul[1] = br[1]
br[1] = x
for i in [2,1,0]: ## Draw three different scales of grid
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(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
@ -76,12 +147,25 @@ class GridItem(UIGraphicsItem):
#print " d", d
#print " nl", nl
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 = np.clip(3.*(ppl-3), 0., 30.)
linePen = QtGui.QPen(QtGui.QColor(255, 255, 255, c))
textPen = QtGui.QPen(QtGui.QColor(255, 255, 255, c*2))
#linePen.setCosmetic(True)
#linePen.setWidth(1)
c = np.clip(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(False)
@ -102,8 +186,7 @@ class GridItem(UIGraphicsItem):
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:
p.setPen(textPen)
if i < 2 and textPen is not None:
if ax == 0:
x = p1[0] + unit[0]
y = ul[1] + unit[1] * 8.
@ -114,7 +197,13 @@ class GridItem(UIGraphicsItem):
tr = self.deviceTransform()
#tr.scale(1.5, 1.5)
p.setWorldTransform(fn.invertQTransform(tr))
for t in texts:
x = tr.map(t[0]) + Point(0.5, 0.5)
p.drawText(x, t[1])
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()