"""
I needed a simple gauge, so I've made on with Pmw.
It might be useful for others to use as a base to develop more comples
gauges with.
Is it worth cleaning up and submitting?
cheers and thanks
chris
Dr. Chris Wright
Intensive Care Unit
Monash Medical Centre
Clayton. VIC Australia
"""
import sys
import Tkinter
import Pmw
import time
if sys.platform == 'win32':
# MS-Windows specific fonts
label_font = "-family Ariel -size 12"
value_font = "-family Ariel -size 12"
small_font = "-family {MS Sans Serif} -size 9 -weight bold"
header_font = "-family {MS Sans Serif} -weight bold"
else:
# X-Windows specific fonts
label_font = "-*-helvetica-*-r-*-*-*-160-*-*-*-*-*-*"
value_font = "-*-courier-*-r-*-*-*-160-*-*-*-*-*-*"
small_font = "-*-helvetica-*-r-*-*-*-130-*-*-*-*-*-*"
header_font = "-*-helvetica-bold-r-*-*-*-150-*-*-*-*-*-*"
class VerticalGauge(Pmw.MegaWidget):
"""Vertical gauge with actual and desired settings"""
def __init__(self, parent = None, **kw):
optiondefs = (
('min', 0, None),
('max', 100, None),
('majortickinterval', 10, None),
('minortickinterval', 5, None),
('units', '', None),
('bg', 'grey', self._backgroundSet),
('actualvalue', 50, self._actualSet),
('desiredvalue', 50, self._desiredSet),
('actualcolour', 'yellow1', None),
('desiredcolour', 'turquoise1', None),
('label', 'Label', None),
)
self.defineoptions(kw, optiondefs)
Pmw.MegaWidget.__init__(self, parent)
interior = self.interior()
interior.grid_rowconfigure(1, weight = 1)
for r in range(3):
interior.grid_columnconfigure(r, weight = 1)
self.actuallabel = self.createcomponent('actualLabel',
(), None,
Tkinter.Label, (interior,),
text = '',
width = 3,
relief = 'sunken',
bd = 1,
fg = self['actualcolour'],
font = value_font)
self.actuallabel.grid(sticky = "nswe", row = 0, column = 0)
self.label = self.createcomponent('label',
(), None,
Tkinter.Label, (interior,),
text = self['label'],
relief = 'raised',
font = label_font,
fg = 'navy',
bd = 2)
self.label.grid(sticky = "nsew", row = 0, column = 1)
self.desiredlabel = self.createcomponent('desiredLabel',
(), None,
Tkinter.Label, (interior,),
text = '',
width = 3,
relief = 'sunken',
bd = 1,
fg = self['desiredcolour'],
font = value_font)
self.desiredlabel.grid(sticky = "nswe", row = 0, column = 2)
self.canvas = self.createcomponent('canvas',
(), None,
Tkinter.Canvas, (interior,),
width = 100,
height = 300,
bg = 'grey')
self.canvas.grid(sticky = "nsew", columnspan = 3, pady = 1)
self.canvas.bind("<Configure>", self._createGaugeAxes)
self._createGaugeAxes()
self.initialiseoptions()
def _createGaugeAxes(self, event = None):
min = self['min']
max = self['max']
units = self['units']
majortickinterval = self['majortickinterval']
gauge_range = max - min
c = self.canvas
c.delete("all")
if event:
h, w = event.height, event.width
else:
h = int(c.configure("height")[4])
w = int(c.configure("width")[4])
self.lower = h - 15
self.upper = 15
self.middle = w / 2
c.create_line(self.middle, self.lower, self.middle, self.upper)
majortickcount = int((max - min) / majortickinterval)
self.axislength = self.lower - self.upper
self.majortickdistance = float(self.axislength) / majortickcount
self.majortickwidth = w / 5
labeloffset = (w / 4) + 10
for i in range(majortickcount + 1):
v = min + i * majortickinterval
d = self.lower - i * self.majortickdistance
c.create_line(self.middle, d, self.middle + self.majortickwidth, d)
c.create_text(self.middle + labeloffset, d, font = small_font, text = str(v))
self._desiredSet(event)
self._actualSet(event)
def _backgroundSet(self):
self.canvas.configure(bg = self['bg'])
def _desiredSet(self, event = None):
c = self.canvas
desired = self['desiredvalue']
desiredcolour = self['desiredcolour']
min = self['min']
max = self['max']
if desired > max: desired = max
if desired < min: desired = min
gauge_range = max - min
c = self.canvas
if event:
h, w = event.height, event.width
else:
h = int(c.configure("height")[4])
w = int(c.configure("width")[4])
desired_y = self.lower - (float(desired - min) / gauge_range) * self.axislength
try:
c.delete('desiredBar')
except:
pass
c.create_line(self.middle - self.majortickwidth, desired_y,
self.middle + self.majortickwidth, desired_y,
fill = desiredcolour, stipple = 'gray50',
width = 10, tag = 'desiredBar')
self.desiredlabel.configure(text = desired)
def setActual(self, value):
self.configure(actualvalue = value)
def getActual(self):
return self.cget('actualvalue')
def _actualSet(self, event = None):
c = self.canvas
actual = self['actualvalue']
actualcolour = self['actualcolour']
min = self['min']
max = self['max']
if actual > max: actual = max
if actual < min: actual = min
gauge_range = max - min
c = self.canvas
if event:
h, w = event.height, event.width
else:
h = int(c.configure("height")[4])
w = int(c.configure("width")[4])
actual_y = self.lower - (float(actual - min) / gauge_range) * self.axislength
try:
c.delete('actualPointer')
except:
pass
triangle = ((self.middle, actual_y),
(self.middle - 1.4 * self.majortickwidth, actual_y - self.majortickwidth / 2),
(self.middle - 1.4 * self.majortickwidth, actual_y + self.majortickwidth / 2))
c.create_polygon(triangle, fill = actualcolour, tag = 'actualPointer')
self.actuallabel.configure(text = actual)
Pmw.forwardmethods(VerticalGauge, Tkinter.Canvas, 'canvas')
if __name__ == '__main__':
# Initialise Tkinter and Pmw.
root = Pmw.initialise()
root.title('Pmw VerticalGauge demonstration')
def increase():
av = g1.getActual()
g1.setActual(av + 1)
def decrease():
av = g1.getActual()
g1.setActual(av - 1)
g1 = VerticalGauge(min = 0,
max = 30,
actualvalue = 15,
desiredvalue = 22,
majortickinterval = 2,
label = "Pms")
g1.grid(sticky = "nsew")
root.grid_rowconfigure(0, weight = 1)
root.grid_columnconfigure(0, weight = 1)
b1 = Tkinter.Button(text = "Increase", command = increase)
b1.grid()
b2 = Tkinter.Button(text = "Decrease", command = decrease)
b2.grid()
# Let's go.
root.mainloop()
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