Here's an example I have that shows what Stephen suggested. It's overly
complicated with the trig, but the rotation is a small object overlaid on a
larger circle.
Specifically, the blue circle background is rotating back-and-forth and the
small red circle is along for the ride. But it looks like the red circle is
doing something cooler all by itself.
#lang scheme
(require 2htdp/universe)
(require 2htdp/image)
(define (render t)
(rotate (* 90 (cos (* t .06)))
(overlay/xy (circle 15 "solid" "red")
-85 -170 (circle 100 "solid" "blue"))))
(big-bang 1 (on-tick add1) (on-draw render))
-Paul
_____
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On Behalf Of Mathew Kurian
Sent: Monday, July 19, 2010 4:38 PM
To: users@racket-lang.org
Subject: [racket] rotate an image using 2htdp/image
Just want to clear up things....the how can adjust the pinhole or the
rotation center?
And Stephen Bloch, can you explain in a bit more detail...seems like that
is exactly what i am looking for...but i am having challenging understanding
the concept.
I am making trying to make a shooter game and move the mans arm up and
down. What is the best way I can achieve this?
PS: All this is in 2htdp/image
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