Very light alternative to PAINT

[Petr]

Hi,

 In the beginning was Cobalt. He had a problem with the program. I couldn't find a problem either. Then came BPlus. And there was light. BPlus showed a recursive function and I sat on my ass.

As soon as he showed it in this thread https://www.qb64.org/forum/index.php?topic=2645.msg118600#msg118600
so I remembered my coloring program. It forms so quickly with recursion! I tried an old condition that I had in the original program: Color borders do not have to be the same color. And it works!

Code: QB64: [Select]

1. o = _NEWIMAGE(320, 240, 256)
2. SCREEN o
3.  
4. FOR x = 160 TO 0 STEP -50
5.     LINE (x, x)-(x + 50, x + 50), 255 * RND, BF
6.     LINE (x, x)-(x - 50, x + 50), 255 * RND, B
7.     LINE (160 - x, 120 - x)-(x + 50, x - 50), 255 * RND, BF
8.     CIRCLE (160, 120), x, 255 * RND
9. NEXT
10.  
11. DO UNTIL _KEYHIT = 27
12.     WHILE _MOUSEINPUT: WEND
13.     IF _MOUSEBUTTON(1) = -1 THEN
14.         Colorize _MOUSEX, _MOUSEY, 14
15.     END IF
16. LOOP
17. END
18.  
19. SUB Colorize (x, y, newc)
20.     c = POINT(x, y)
21.     IF c = newc THEN EXIT SUB
22.     Find x, y, c
23. END SUB
24.  
25. SUB Find (x, y, c) 'c is background color, which is rewrited
26.     IF POINT(x, y) = c THEN
27.         PSET (x, y), 14
28.         Xp = x + 1: IF Xp > _WIDTH THEN Xp = _WIDTH
29.         Xm = x - 1: IF Xm < 0 THEN Xm = 0
30.         Yp = y + 1: IF Yp > _HEIGHT THEN Yp = _HEIGHT
31.         Ym = y - 1: IF Ym < 0 THEN Ym = 0
32.         Find Xp, y, c
33.         Find Xm, y, c
34.         Find x, Yp, c
35.         Find x, Ym, c
36.     END IF
37. END SUB
38.  

[Ashish]

Very nice use of recursion. :D

[SierraKen]

Wow I never knew this either! Am trying to study it but will have to kinda tear it apart to figure out what some of this means.
Also by the way, if you don't know already, you don't need 2 lines for your first 2 lines you have there, just 1. All you need is this:

Code: QB64: [Select]

1. SCREEN _NEWIMAGE(320, 240, 256)