#/*
#Python and Tkinter Programming
#John E. Grayson
#ISBN: 1884777813
#Publisher: Manning
#*/
from Tkinter import *
SQUARE = 1
ROUND = 2
ARROW = 3
POINT_DOWN = 0
POINT_UP = 1
POINT_RIGHT = 2
POINT_LEFT = 3
STATUS_OFF = 1
STATUS_ON = 2
STATUS_WARN = 3
STATUS_ALARM = 4
STATUS_SET = 5
class DummyClass:
pass
Color = DummyClass()
Color.PANEL = '#545454'
Color.OFF = '#656565'
Color.ON = '#00FF33'
Color.WARN = '#ffcc00'
Color.ALARM = '#ff4422'
class LED:
def __init__(self, master=None, width=25, height=25,
appearance=FLAT,
status=STATUS_ON, bd=1,
bg=None,
shape=SQUARE, outline="",
blink=0, blinkrate=1,
orient=POINT_UP,
takefocus=0):
# preserve attributes
self.master = master
self.shape = shape
self.onColor = Color.ON
self.offColor = Color.OFF
self.alarmColor = Color.ALARM
self.warningColor = Color.WARN
self.specialColor = '#00ffdd'
self.status = status
self.blink = blink
self.blinkrate = int(blinkrate)
self.on = 0
self.onState = None
if not bg:
bg = Color.PANEL
## Base frame to contain light
self.frame=Frame(master, relief=appearance, bg=bg, bd=bd,
takefocus=takefocus)
basesize = width
d = center = int(basesize/2)
if self.shape == SQUARE:
self.canvas=Canvas(self.frame, height=height, width=width,
bg=bg, bd=0, highlightthickness=0)
self.light=self.canvas.create_rectangle(0, 0, width, height,
fill=Color.ON)
elif self.shape == ROUND:
r = int((basesize-2)/2)
self.canvas=Canvas(self.frame, width=width, height=width,
highlightthickness=0, bg=bg, bd=0)
if bd > 0:
self.border=self.canvas.create_oval(center-r, center-r,
center+r, center+r)
r = r - bd
self.light=self.canvas.create_oval(center-r-1, center-r-1,
center+r, center+r, fill=Color.ON,
outline=outline)
else: # Default is an ARROW
self.canvas=Canvas(self.frame, width=width, height=width,
highlightthickness=0, bg=bg, bd=0)
x = d
y = d
if orient == POINT_DOWN:
self.light=self.canvas.create_polygon(x-d,y-d, x,y+d,
x+d,y-d, x-d,y-d, outline=outline)
elif orient == POINT_UP:
self.light=self.canvas.create_polygon(x,y-d, x-d,y+d,
x+d,y+d, x,y-d, outline=outline)
elif orient == POINT_RIGHT:
self.light=self.canvas.create_polygon(x-d,y-d, x+d,y,
x-d,y+d, x-d,y-d, outline=outline)
elif orient == POINT_LEFT:
self.light=self.canvas.create_polygon(x-d,y, x+d,y+d,
x+d,y-d, x-d,y, outline=outline)
self.canvas.pack(side=TOP, fill=X, expand=NO)
self.update()
def turnon(self):
self.status = STATUS_ON
if not self.blink: self.update()
def turnoff(self):
self.status = STATUS_OFF
if not self.blink: self.update()
def alarm(self):
self.status = STATUS_ALARM
if not self.blink: self.update()
def warn(self):
self.status = STATUS_WARN
if not self.blink: self.update()
def set(self, color):
self.status = STATUS_SET
self.specialColor = color
self.update()
def blinkon(self):
if not self.blink:
self.blink = 1
self.onState = self.status
self.update()
def blinkoff(self):
if self.blink:
self.blink = 0
self.status = self.onState
self.onState = None
self.on = 0
self.update()
def blinkstate(self, blinkstate):
if blinkstate:
self.blinkon()
else:
self.blinkoff()
def update(self):
# First do the blink, if set to blink
if self.blink:
if self.on:
if not self.onState:
self.onState = self.status
self.status = STATUS_OFF
self.on = 0
else:
if self.onState:
self.status = self.onState # Current ON color
self.on = 1
if self.status == STATUS_ON:
self.canvas.itemconfig(self.light, fill=self.onColor)
elif self.status == STATUS_OFF:
self.canvas.itemconfig(self.light, fill=self.offColor)
elif self.status == STATUS_WARN:
self.canvas.itemconfig(self.light, fill=self.warningColor)
elif self.status == STATUS_SET:
self.canvas.itemconfig(self.light, fill=self.specialColor)
else:
self.canvas.itemconfig(self.light, fill=self.alarmColor)
self.canvas.update_idletasks()
if self.blink:
self.frame.after(self.blinkrate * 1000, self.update)
if __name__ == '__main__':
class TestLEDs(Frame):
def __init__(self, parent=None):
# List of Colors and Blink On/Off
states = [(STATUS_OFF, 0),
(STATUS_ON, 0),
(STATUS_WARN, 0),
(STATUS_ALARM, 0),
(STATUS_SET, 0),
(STATUS_ON, 1),
(STATUS_WARN, 1),
(STATUS_ALARM, 1),
(STATUS_SET, 1)]
# List of LED types to display,
# with sizes and other attributes
leds = [(ROUND, 25, 25, FLAT, 0, None, ""),
(ROUND, 15, 15, RAISED, 1, None, ""),
(SQUARE, 20, 20, SUNKEN, 1, None, ""),
(SQUARE, 8, 8, FLAT, 0, None, ""),
(SQUARE, 8, 8, RAISED, 1, None, ""),
(SQUARE, 16, 8, FLAT, 1, None, ""),
(ARROW, 14, 14, RIDGE, 1, POINT_UP, ""),
(ARROW, 14, 14, RIDGE, 0, POINT_RIGHT, ""),
(ARROW, 14, 14, FLAT, 0, POINT_DOWN, "white")]
Frame.__init__(self) # Do superclass init
self.pack()
self.master.title('LED Example - Stage 1')
# Iterate for each type of led
for shape, w, h, app, bd, orient, outline in leds:
frame = Frame(self, bg=Color.PANEL)
frame.pack(anchor=N, expand=YES, fill=X)
# Iterate for selected states
for state, blink in states:
LED(frame, shape=shape, status=state,
width=w, height=h, appearance=app,
orient=orient, blink=blink, bd=bd,
outline=outline).frame.pack(side=LEFT,
expand=YES, padx=1, pady=1)
TestLEDs().mainloop()
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