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Mandelbrot fractal. Compile with -lm using gcc =).
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| #include <stdio.h> | |
| #include <sys/ioctl.h> | |
| #include <unistd.h> | |
| #include <math.h> | |
| #include <inttypes.h> | |
| #define ITERNUM 50 | |
| #define THRESH 10 | |
| #define GRAN 0.02 | |
| /* | |
| ........:::..::--.. | |
| ..........::--:....... | |
| ...........::-=::........ | |
| ..........::::-% =:........ | |
| ..........:=-#-- +-+:=:....... | |
| ................:- -:.......... | |
| ...................:=* =*+............... | |
| .....................:: +::................... | |
| ......#::-:-:....::=:::::--@ #-:::::.:=..........::.. | |
| .........:-@---@:::=+ - + @-@+ #:.......-#.... | |
| ............:: %- + @-@:::-+:::++-... | |
| ...............:* # -# %-:=... | |
| .....................:::-=* =+...... | |
| ..............................::--:: +=-:....... | |
| ................................- % #-:....... | |
| .....:...........................::-@ ::..:... | |
| ......:-:.........-:.............:- + + *-+:.. | |
| ........--=-+::::::-#-:::=.......:::-* @-=... | |
| ............::-%+*---=% --%-:::::::: =:..... | |
| .............::=+ * *+%:::::+ +:-... | |
| ..............::::-= #-:-= +*#:... | |
| ...........:......::* #--* :..... | |
| .................:%::::::= + :...... | |
| ......................::---+=-= -....... | |
| ..........:.............:::--= :....... | |
| :=+*=*+*+*# #**%#%%#%%% +-::........ | |
| ..........:.............:::--= :....... | |
| ......................::---+=-= -....... | |
| .................:%::::::= + :...... | |
| ...........:......::* #--* :..... | |
| ..............::::-= #-:-= +*#:... | |
| .............::=+ * *+%:::::+ +:-... | |
| ............::-%+*---=% --%-:::::::: =:..... | |
| ........--=-+::::::-#-:::=.......:::-* @-=... | |
| ......:-:.........-:.............:- + + *-+:.. | |
| .....:...........................::-@ ::..:... | |
| ................................- % #-:....... | |
| ..............................::--:: +=-:....... | |
| .....................:::-=* =+...... | |
| ...............:* # -# %-:=... | |
| ............:: %- + @- :::-+:::++-... | |
| .........:-@---@:::=+ - + @-@+ #:.......-#.... | |
| ......#::-:-:....::=:::::--@ #-:::::.:=..........::.. | |
| .....................:: +::................... | |
| ...................:=* =*+............... | |
| ................:- -:.......... | |
| ..........:=-#-- +-+:=:....... | |
| ..........::::-% =:........ | |
| ...........::-=::........ | |
| ..........::--:....... | |
| */ | |
| int main() { | |
| //[-2 0.5] | |
| //[-1 1] | |
| float y1 = -1; | |
| float y2 = 1; | |
| float x1 = -2; | |
| float x2 = 0.5; | |
| char pixelmap[] = {' ',' ',' ',' ',' ', | |
| '.','.','.','.','.', | |
| ':',':',':',':',':', | |
| '-','-','-','-','-', | |
| '=','=','=','=','=', | |
| '+','+','+','+','+', | |
| '*','*','*','*','*', | |
| '#','#','#','#','#', | |
| '%','%','%','%','%', | |
| '@','@','@','@','@'}; | |
| for (float b = y1; b < y2; b+=GRAN*2) { | |
| for (float a = x1; a < x2; a+=GRAN) { | |
| //z_0 | |
| float za = a; | |
| float zb = b; | |
| //z_(n+1) | |
| float wa,wb; | |
| //Max num of iterations where the result does not tend to infinity. | |
| int max_n = 0; | |
| //As n -> ∞, does z_n tend to infinity? | |
| for (int n = 0; n < ITERNUM; n++) { | |
| //Compute z_(n+1) using the value of z_n and the current point | |
| wa = (za*za - zb*zb) + a; | |
| wb = 2*za*zb + b; | |
| if (sqrt(wa*wa + wb*wb) > THRESH) { | |
| //z_n is tending to infinity. C is not in Mandelbrot set. | |
| max_n = n; | |
| break; | |
| } | |
| za = wa; | |
| zb = wb; | |
| } | |
| //Display point according to max_n. | |
| putc(pixelmap[max_n],stdout); | |
| } | |
| putc('\n',stdout); | |
| } | |
| return 0; | |
| } |
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