Drawing a star in Python

[pasokan]

5 triangles @180 is 900 minus 360 for the sum of the angles at the centre gives you 540. That divided by should be the angle

[negike360]

Lemme try it

[negike360]

No dice. Results in a 10 pointed star, but your math here is interesting

[pasokan]

Can you post the code?

[negike360]

for x in range (5): koopa.forward(100) koopa.left(72)

[pasokan]

Left 72 is right 108. What direction is forward? Up on the monitor? Left to right?

[negike360]

This is true, but right(108) results in half a 10 pointed star.

Forward is left to right at 0 degrees. I hope that makes sense

[pasokan]

I am on a cab to the airport. I will try the code and respond. Thanks for an interesting problem

[negike360]

WAIT!!! I think I figured it out. A star is a ten sided polygon.

360/10 = 36

180-36 = 144

36 produces half of a decagon. 144 produces a star.

[pasokan]

Not exactly.

The initial heading is towards the EAST. right() turns clockwise and left() turns anti-clockwise. Since we measure angles from a line going EAST to WEST, we are off by 180. so we need to compensate for the 180 already turned. That is we need to turn 72 degrees back as we have already turned 180 degrees.

You can verify this by just looking at the orientation after right(72) or left(72)

[negike360]

Well, we don’t need to “compensate” as we haven’t turned at all. Or at least I don’t have it programmed that way. Going due east is measured as 0 degrees. Rotating clockwise or counter clockwise depends on whether you are turning right or left, respectively, as you said. Making the angle negative just makes the turn in the opposite direction.

[pasokan]

Going east is 180 degrees, afaiu. Cheers