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from Tkinter import *
from math import *
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.
"""
traces = []
def __init__(self, parent, width=400., height=200.):
self.parent = parent
self.SCX = width
self.SCY = height
self.border = 1
self.canvas = Canvas(parent, width=width, height=height)
self.canvas.pack(side = LEFT)
self.setWorld(0 , 0, self.SCX, self.SCY) # initialize scale factors
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 line(self, points, col='blue'):
ip = self.w2s(points)
t = self.canvas.create_line(ip, fill=col)
self.traces.append(t)
def delete_lines(self):
for t in self.traces:
self.canvas.delete(t)
self.traces = []
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