plotting points on a circle - GameCreators Forum

developer forums

Newcomers DBPro Corner / plotting points on a circle

Author

Message

Dracula

Years of Service

User Offline

Joined: 7th Aug 2006

Location: DBP Recreation of Castle Csejthe

Posted: 2nd Dec 2006 17:49

Link

I know that C=3.14 * radius squared, but can someone help me with a formula to plot points on a circle?

Thanks!!!

D

Profile PM

TEH_CODERER

Years of Service

User Offline

Joined: 12th Nov 2003

Location: Right behind you!

Posted: 2nd Dec 2006 21:06

Link

Are you saying that C is area? Area=pi*r^2 but cirumference=2*pi*r. There are a couple of ways. Firstly, as the graph of a circle is y^2+x^2=r^2 you can use if statements to check points are on the circle. The alternative is to use sin/cos.
Using 1st idea:

+ Code Snippet

set display mode 640,480,32
xcenter=320
ycenter=240
radius=25
for x=-25 to 25
   for y=-25 to 25
      if ((x^2)+(y^2))=(radius^2)
         dot x+xcenter,y+ycenter
      endif
   next y
next x
wait key

Using 2nd idea:

+ Code Snippet

set display mode 640,480,32
xcenter=320
ycenter=240
radius=25
for a=0 to 359
   x=cos(a)*radius
   y=sin(a)*radius
   dot x+xcenter,y+ycenter
next a
wait key

Hope that helps.

Profile PM Email

Dracula

Years of Service

User Offline

Joined: 7th Aug 2006

Location: DBP Recreation of Castle Csejthe

Posted: 3rd Dec 2006 04:15

Link

awsome!!! Thanks TEH_CODERER

Profile PM

TEH_CODERER

Years of Service

User Offline

Joined: 12th Nov 2003

Location: Right behind you!

Posted: 3rd Dec 2006 17:19

Link

No probs! Glad I could help.

Profile PM Email

Server time is: 2024-11-26 05:29:31
Your offset time is: 2024-11-26 05:29:31

Sorry your browser is not supported!

Newcomers DBPro Corner / plotting points on a circle