Trig Demo
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Get the following short program up and running.
<![CDATA[
#!/usr/bin/python
from tkinter import *
import math
tk = Tk()
canvas = Canvas(tk,width=300, height=300, background="black")
canvas.pack()
for a in range(0,360,10):
x = math.cos(a*math.pi/180) * 80 + 150
y = math.sin(a*math.pi/180) * 80 + 150
canvas.create_line(150,150,x,y,fill="red", width=2)
canvas.create_text(150,15,text="Trigonometry Demonstration", fill="red")
]]>
If you haven't taken a trig course yet, these two lines might be incomprehensible
to you. They use the cosine function and sin function to compute the
location of a point along the circumference of a circle. The angle must be
converted to radians (multiply by PI divided by 180) in order to produce a
correct calculation.
<![CDATA[
x = math.cos(a*math.pi/180) * 80 + 150;
y = math.sin(a*math.pi/180) * 80 + 150;
]]>
By the way 80 is the radius of this circle. To make a larger or smaller
circle, just change this value. Where do you think the center of the circle
is located?
ASSIGNMENT:
Use trig functions to plot a regular decagon with a height of about one
hundred screen units.
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