Wavy Thing
Back to index
You don't necessarily create only straight lines with create_line. Consider
this example:
<![CDATA[
#!/usr/bin/python
from tkinter import *
import math
tk = Tk();
canvas = Canvas(tk,width=480, height=100, background="black")
canvas.pack()
for c in range (20,424,80):
for a in range(0,180):
x = math.cos(a*math.pi/180) * 20 + c;
y = math.sin(a*math.pi/180) * 20 + 50;
canvas.create_line(x,y,x+1,y+1,fill="red", width=2);
for a in range(180,360):
x = math.cos(a*math.pi/180) * 20 + c+40;
y = math.sin(a*math.pi/180) * 20 + 50;
canvas.create_line(x,y,x+1,y+1,fill="red", width=2);
]]>
Keep in mind that the c variable is used to keep track of the center of each
half circle. Since the waves are arranged horizontally, the x-coordinate is
determined through use of the c variable.
Although the create_line function is used in this example, all that is
created by each call of create_line is a single dot.
ASSIGNMENT:
Make your waves vertical instead of horizontal and create five of them, side
by side. Also make the radius ten units and create seven peaks and seven valleys
for each wave.
|