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from Tkinter import *
AXWIDTH = 30 # width of the axis display canvas
class disp:
"""
Class for displaying items in a canvas using a world coordinate system. The range of the
world coordinate system is specified by calling the setWorld method.
"""
border = 0
pad = 0
bordcol = 'grey' # Border color
gridcol = 'grey' # Grid color
bgcolor = '#dbdbdb' # background color for all
plotbg = 'ivory' # Plot window background color
textcolor = 'blue'
traces = []
xtext = []
ytext = []
markerval = []
markertext = None
def __init__(self, parent, width=400., height=100.,color = 'ivory'):
self.parent = parent
self.SCX = width
self.SCY = height
self.plotbg = color
f = Frame(parent, bg = self.bgcolor, borderwidth = self.pad)
f.pack(side=TOP)
self.yaxis = Canvas(f, width = AXWIDTH, height = height, bg = self.bgcolor)
self.yaxis.pack(side = LEFT, anchor = N, pady = self.border)
f1 = Frame(f)
f1.pack(side=LEFT)
self.canvas = Canvas(f1, background = self.plotbg, width = width, height = height)
self.canvas.pack(side = TOP)
self.canvas.bind("<Button-1>", self.show_xy)
self.xaxis = Canvas(f1, width = width, height = AXWIDTH, bg = self.bgcolor)
self.xaxis.pack(side = LEFT, anchor = N, padx = self.border)
self.canvas.create_rectangle ([(1,1),(width,height)], outline = self.bordcol)
self.canvas.pack()
Canvas(f, width = AXWIDTH, height = height, bg = self.bgcolor).pack(side=LEFT) # spacer only
self.setWorld(0 , 0, self.SCX, self.SCY) # initialize scale factors
self.grid(10,100)
def setWorld(self, x1, y1, x2, y2): #Calculates the scale factors
self.xmin = float(x1)
self.ymin = float(y1)
self.xmax = float(x2)
self.ymax = float(y2)
self.xscale = (self.xmax - self.xmin) / (self.SCX)
self.yscale = (self.ymax - self.ymin) / (self.SCY)
def w2s(self, p): # World to Screen xy conversion before plotting anything
ip = []
for xy in p:
ix = self.border + int( (xy[0] - self.xmin) / self.xscale)
iy = self.border + int( (xy[1] - self.ymin) / self.yscale)
iy = self.SCY - iy
ip.append((ix,iy))
return ip
def show_xy(self,event): #Prints the XY coordinates of the current cursor position
ix = self.canvas.canvasx(event.x) - self.border
iy = self.SCY - self.canvas.canvasy(event.y) #- self.border
x = ix * self.xscale + self.xmin
y = iy * self.yscale + self.ymin
s = 'x = %5.3f\ny = %5.3f' % (x,y)
try:
self.canvas.delete(self.markertext)
except:
pass
self.markertext = self.canvas.create_text(self.border + 1,\
self.SCY-1, anchor = SW, justify = LEFT, text = s)
self.markerval = [x,y]
def mark_axes(self, xlab='milli seconds', ylab='mV', numchans=1):
# Draw the axis labels and values
numchans = 1
for t in self.xtext: # display after dividing by scale factors
self.xaxis.delete(t)
for t in self.ytext:
self.yaxis.delete(t)
self.xtext = []
self.ytext = []
dx = float(self.SCX)/5
for x in range(0,6):
a = numchans * x *(self.xmax - self.xmin)/5 + self.xmin
s = '%4.1f'%(a)
adjust = 0
if x == 0: adjust = 6
if x == 5: adjust = -10
t = self.xaxis.create_text(int(x*dx)+adjust,1,text = s, anchor=N, fill = self.textcolor)
self.xtext.append(t)
self.xtext.append(self.xaxis.create_text(int(self.SCX/2)\
,AXWIDTH, text = xlab, anchor=S, fill = self.textcolor))
dy = float(self.SCY)/5
for y in range(0,6):
a = y*(self.ymax - self.ymin)/5 # + self.ymin
if self.ymax > 99:
s = '%4.0f'%(self.ymax-a)
else:
s = '%4.1f'%(self.ymax-a)
adjust = 0
if y == 0: adjust = 6
if y == 5: adjust = -5
t = self.yaxis.create_text(AXWIDTH, int(y*dy)+adjust, \
text = s,anchor = E, fill = self.textcolor)
self.ytext.append(t)
self.ytext.append(self.yaxis.create_text(0,self.SCY/2,\
text = ylab, anchor=W, fill = self.textcolor))
def box(self, x1, y1, x2, y2, col):
ip = self.w2s([(x1,y1),(x2,y2)])
self.canvas.create_rectangle(ip, outline=col)
def line(self, points, col, permanent = False, smooth = True):
ip = self.w2s(points)
t = self.canvas.create_line(ip, fill=col, smooth = smooth)
if permanent == False:
self.traces.append(t)
def delete_lines(self):
for t in self.traces:
self.canvas.delete(t)
self.traces = []
def grid(self, major, minor):
dx = (self.xmax - self.xmin) / major
dy = (self.ymax - self.ymin) / major
x = self.xmin + dx
while x < self.xmax:
self.line([(x,self.ymin),(x,self.ymax)],self.gridcol, True)
x = x +dx
y = self.ymin + dy
while y < self.ymax:
self.line([(self.xmin,y),(self.xmax,y)],self.gridcol, True)
y = y +dy
#------------------------------- disp class end --------------------------------------
root = Tk()
for k in range(3):
w = disp(root, width=400, height=100)
w.setWorld(0, 0, 100, 100)
w.mark_axes('X','Y')
root.mainloop()
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