aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

Initial data commit

Browse source
This commit is contained in:
Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
199087 changed files with 3378941 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

39
Task/Bitmap-Bresenhams-line-algorithm/PicoLisp/bitmap-bresenhams-line-algorithm.l Normal file
View file

@ -0,0 +1,39 @@
(de brez (Img X Y DX DY)
(let SX
(cond
((=0 DX) 0)
((gt0 DX) 1)
(T (setq DX (- DX)) -1) )
(let SY
(cond
((=0 DY) 0)
((gt0 DY) 1)
(T (setq DY (- DY)) -1) )
(if (>= DX DY)
(let E (- (* 2 DY) DX)
(do DX
(set (nth Img Y X) 1)
(when (ge0 E)
(inc 'Y SY)
(dec 'E (* 2 DX)) )
(inc 'X SX)
(inc 'E (* 2 DY)) ) )
(let E (- (* 2 DX) DY)
(do DY
(set (nth Img Y X) 1)
(when (ge0 E)
(inc 'X SX)
(dec 'E (* 2 DY)) )
(inc 'Y SY)
(inc 'E (* 2 DX)) ) ) ) ) ) )
(let Img (make (do 90 (link (need 120 0)))) # Create image 120 x 90
(brez Img 10 10 100 30) # Draw five lines
(brez Img 10 10 100 50)
(brez Img 10 10 100 70)
(brez Img 10 10 60 70)
(brez Img 10 10 20 70)
(out "img.pbm" # Write to bitmap file
(prinl "P1")
(prinl 120 " " 90)
(mapc prinl Img) ) )