Bitmap/Midpoint circle algorithm: Difference between revisions
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NB.* |
NB.*drawCircles v Draws circle(s) (x) on image (y) |
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NB. x is: 2-item list (y0 x0 radius) ; (color) |
NB. x is: 2-item list of boxed (y0 x0 radius) ; (color) |
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drawCircle=: (1&{:: ;~ [: ; [: <@getBresenhamCircle"1 (0&{::))@[ setPixels ] |
drawCircle=: (1&{:: ;~ [: ; [: <@getBresenhamCircle"1 (0&{::))@[ setPixels ] |
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</lang> |
</lang> |
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'''Example usage:''' |
'''Example usage:''' |
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<lang j> myimg=: 0 255 0 makeRGB 25 25 NB. 25 by 25 green image |
<lang j> myimg=: 0 255 0 makeRGB 25 25 NB. 25 by 25 green image |
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myimg=: (12 12 12 ; 255 0 0) |
myimg=: (12 12 12 ; 255 0 0) drawCircles myimg NB. draw red circle with radius 12 |
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viewRGB ((12 12 9 ,: 12 12 6) ; 0 0 255) |
viewRGB ((12 12 9 ,: 12 12 6) ; 0 0 255) drawCircles myimg NB. draw two more concentric circles |
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</lang> |
</lang> |
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