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Newcomers DBPro Corner / plotting points on a circle

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Dracula

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Joined: 7th Aug 2006

Location: DBP Recreation of Castle Csejthe

Posted: 2nd Dec 2006 17:49

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

Thanks!!!

D

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TEH_CODERER

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Joined: 12th Nov 2003

Location: Right behind you!

Posted: 2nd Dec 2006 21:06

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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.

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Dracula

Years of Service

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Joined: 7th Aug 2006

Location: DBP Recreation of Castle Csejthe

Posted: 3rd Dec 2006 04:15

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awsome!!! Thanks TEH_CODERER

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TEH_CODERER

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Joined: 12th Nov 2003

Location: Right behind you!

Posted: 3rd Dec 2006 17:19

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No probs! Glad I could help.

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Newcomers DBPro Corner / plotting points on a circle