Moze mi ktoś wyjaśnić jak ten kod rysuje okrąg bo nie mogę normalnie tego objąć umysłem

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Sub Lcd_circle(byval X As Word , Byval Y As Word , Byval Radius As Integer , Byval Color As Word)

Local X0 As Word , Y0 As Word , Error As Integer

Local Xp As Word , Yp As Word , Xe As Word , Ye As Word

Error = -radius

Xp = Radius

Yp = 0

While Xp >= Yp

 X0 = X + Xp : Y0 = Y + Yp

 Call Lcd_set_pixel(x0 , Y0 , Color)

 X0 = X - Xp : Y0 = Y + Yp

 Call Lcd_set_pixel(x0 , Y0 , Color)

 X0 = X + Xp : Y0 = Y - Yp

 Call Lcd_set_pixel(x0 , Y0 , Color)

 X0 = X - Xp : Y0 = Y - Yp

 Call Lcd_set_pixel(x0 , Y0 , Color)

 X0 = X + Yp : Y0 = Y + Xp

 Call Lcd_set_pixel(x0 , Y0 , Color)

 X0 = X - Yp : Y0 = Y + Xp

 Call Lcd_set_pixel(x0 , Y0 , Color)

 X0 = X + Yp : Y0 = Y - Xp

 Call Lcd_set_pixel(x0 , Y0 , Color)

 X0 = X - Yp : Y0 = Y - Xp

 Call Lcd_set_pixel(x0 , Y0 , Color)

  Error = Error + Yp

   Incr Yp

   Error = Error + Yp

   If Error >= 0 Then

     Decr Xp

     Error = Error - Xp

     Error = Error - Xp

   End If

Wend

End Sub"

#matematyka #programowanie