circ.ml(文件已创建)
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| 1 | + | let circ ~x ~y ~radius ?(r=0) ?(g=0) ?(b=0) screen = | |
| 2 | + | let t1 = ref (radius / 16) in | |
| 3 | + | let t2 = ref !t1 in | |
| 4 | + | let cx, cy = ref radius, ref 0 in | |
| 5 | + | while !cx >= !cy do | |
| 6 | + | set_pixel screen ( !cx + x) ( !cy + y) ~r ~g ~b ; | |
| 7 | + | set_pixel screen ( !cx + x) (-1 * !cy + y) ~r ~g ~b ; | |
| 8 | + | set_pixel screen (-1 * !cx + x) ( !cy + y) ~r ~g ~b ; | |
| 9 | + | set_pixel screen (-1 * !cx + x) (-1 * !cy + y) ~r ~g ~b ; | |
| 10 | + | set_pixel screen ( !cy + x) ( !cx + y) ~r ~g ~b ; | |
| 11 | + | set_pixel screen ( !cy + x) (-1 * !cx + y) ~r ~g ~b ; | |
| 12 | + | set_pixel screen (-1 * !cy + x) ( !cx + y) ~r ~g ~b ; | |
| 13 | + | set_pixel screen (-1 * !cy + x) (-1 * !cx + y) ~r ~g ~b ; | |
| 14 | + | ||
| 15 | + | cy := !cy + 1 ; | |
| 16 | + | t1 := !t1 + !cy ; | |
| 17 | + | t2 := !t1 - !cx ; | |
| 18 | + | if !t2 >= 0 then begin | |
| 19 | + | t1 := !t2 ; | |
| 20 | + | cx := !cx - 1 ; | |
| 21 | + | end | |
| 22 | + | done | |
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