Member Avatar for hkseo100

Hey guys.
This looks like the right place to ask this question. I just started Python, and I'm still getting familiar with syntaxes and such.

Right now, I'm trying to make a program that will make an Isoceles triangle with Turtle module and math module

I really don't know what else syntax to use without getting errors, but this is what i have so far.

import math
import cTurtle
t = cTurtle.Turtle()
side = "math.acos((BaseLength/2)/SideLength))*(180/3.14159265)"
base = "180-(side*2)"

def IsoTriangle(BaseLength,SideLength,myTurtle):
	myTurtle.forward(BaseLength)
	myTurtle.left(base + 90)
	myTurtle.forward(SideLength)
	myTurtle.left(side + 90)
	myTurtle.forward(SideLength)

can anyone help me fixing up the syntaxes? thanks
(the myTurtle.left(side + 90) might not be right, but all I want is just cTurtle to recognizee the formula so when someone puts the right numbers in, it will draw the triangle)

thanks again

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  • Latest Post Latest Post by hkseo100
Member Avatar for Friktion

why are you using strings wiht base and side ?
maybe this is something for u

import math
import cTurtle
t = cTurtle.Turtle()
side = math.acos((BaseLength/2)/SideLength))*(180/3.14159265)
base = 180-(side*2)

def IsoTriangle(BaseLength,SideLength,myTurtle):
	myTurtle.forward(BaseLength)
	myTurtle.left(base + 90)
	myTurtle.forward(SideLength)
	myTurtle.left(side + 90)
	myTurtle.forward(SideLength)
Edited by Friktion because: n/a
Member Avatar for hkseo100

if i do that, it says
SyntaxError: invalid syntax (<pyshell#3>, line1)

ok, i fixed that by closing the SideLength with parantheses.

however, it says BaseLength is not defined.
I know it's not ,because the user has to put the numbers themselves in the function so it draws the triangle.

do I have to restructure this? different order?
Please help.

thanks

Edited by hkseo100 because: n/a
Member Avatar for sneekula

I would stay away from module cturtle and use Python's own thoroughly tested module turtle. Here is a small code sample that shows you how to handle the turtle direction properly:

import math
import turtle as tu

base_length = 200
# the two sides are equal in an Isoceles triangle
side_length = 300

# angle shared by base and side
base_angle = math.degrees( math.acos((base_length/2.0)/side_length) )
# angle shared by sides
side_angle = 180 - base_angle*2

# values for speed are 'fastest' (no delay), 'fast', (delay 5ms),
# 'normal' (delay 10ms), 'slow' (delay 15ms), 'slowest' (delay 20ms)
#tu.speed('fastest')

# turtle by default starts at (x=0, y=0) center of display
# to center the triangle lift the pen up then move
# to the left by base_length/2 and down side_length/2 units
# now drop the pen down to start drawing
tu.up()
tu.goto(-base_length/2, -side_length/2)
tu.down()

tu.forward(base_length)
tu.left(180 - base_angle)
tu.forward(side_length)
tu.left(180 - side_angle)
tu.forward(side_length)

# keep showing until corner x is clicked
tu.done()
Edited by sneekula because: n/a
Member Avatar for sneekula

Oops, DaniWeb is behaving goofy and made two copies of my code!

Edited by sneekula because: n/a
Member Avatar for hkseo100

Hey guys
I got it working, with trial and error,
(sneekula, your code is great too, but sadly I can't use it since my assignment wants me to use cTurtle :-( )

import math
>>> import cTurtle
>>> t = cTurtle.Turtle()
>>> def IsoTriangle(BaseLength,SideLength,myTurtle):
	myTurtle.backward(BaseLength)
	myTurtle.left((math.acos((BaseLength/2)/(SideLength)))*(180/3.14159265))
	myTurtle.forward(SideLength)
	myTurtle.right((math.acos((BaseLength/2)/(SideLength)))*(180/3.14159265)*(2)-(180))
	myTurtle.backward(SideLength)
Edited by hkseo100 because: n/a
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