[Tutor] Fwd: circular movement in pygame

[diliup gabadamudalige]

question to Lucas.

Not sure if this is what you're looking for, but I would also use cos for
the x coordinate as suggested.  If:

self.rect.x = self.radius * math.cos(self.angle) + self.center_x
self.rect.y = self.radius * math.sin(self.angle) + self.center_y

Take a derivative (assume:  angle += angular_vel * dt for every increment
in time dt), so that:

self.rect.x += -self.radius * math.sin(self.angle) * self.angular_vel * dt
self.rect.y += self.radius * math.cos(self.angle) * self.angular_vel * dt

what is dt?


On Wed, Apr 29, 2015 at 12:45 PM, diliup gabadamudalige <diliupg at gmail.com>
wrote:

> Thanks all for the responses.
> Charles Cossé -  yes I can write a simple pygame program that makes a
> sprite move in a circle but it may not be the style and order that many may
> approve or accept. I consider myself a student. :)
> No one has pointed out why the object moves in a circle properly in the
> bit of code where it is addressed directly and why it does not when the
> same code is applied thru a class.
> I know that an object can be made to move around the circumference of a
> circle by constantly calculating the point and giving the x and y values
>
> 1. x = some code
>
> That is what I used and it worked. I was trying to find how we can do the
> same thing by updating the current position by doing
>
> 2. x += some code
>  Above 1 works. 2 does not. Why is that?
>
> Both the same code. The same variable is used with different names cause
> some others were confused when they were the same.
>
>  I hope this time I have answered correctly. No more attachments. (e mail
> or otherwise. :) )
>



-- 
Diliup Gabadamudalige

http://www.diliupg.com
http://soft.diliupg.com/

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