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libtthimage/Tools/fractales.c
tTh 58b8fa878c add new ugly tools
2024-11-17 10:44:07 +01:00

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/*
fractales.c
===========
*....................................................*
. warning, this is a 'work in progress' .
. .
. don't trust prototypes for building .
. serious applications... .
*....................................................*
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <tthimage.h>
#include "fractales.h"
/*::------------------------------------------------------------------::*/
void Image_fractales_print_version(int flag)
{
printf("*** Fractales (%s) v 0.0.12\n", __FILE__);
if (flag)
{
printf("\tcompiled %s , %s\n", __DATE__, __TIME__);
}
}
/*::------------------------------------------------------------------::*/
/*
* fonction de comparaison de deux variables 'double'
*/
int compare_double(double a, double b)
{
return 0;
}
/*::------------------------------------------------------------------::*/
/*
* cette fonction a été repompé (sans honte :) du livre de
* Roger T. Stevens, "Fractal Programming in C" éditée par
* M&T Books.
* Ceci dit, elle est un peu trop monolithique, puisque l'équation
* à résoudre est codée en dur.
*/
int Newton_0(Image_Desc *im, int maxiter)
{
int col, row, i;
double dcol, drow;
double Xmax, Xmin, Ymax, Ymin;
double deltaX, deltaY, denom;
double X, Y, Xsquare, Ysquare, Xold, Yold;
Xmax = Ymax = 3.5; Xmin = Ymin = -3.5;
deltaX = (Xmax-Xmin)/(double)im->width;
deltaY = (Ymax-Ymin)/(double)im->height;
for (col=0; col<im->width; col++)
{
dcol = (double)col;
for (row=0; row<im->height; row++)
{
drow = (double)row;
X = Xmin + dcol * deltaX;
Y = Ymin + drow * deltaY;
Xsquare = 0.0;
Ysquare = 0.0;
Xold = Yold = 42.0;
for (i=0; i<maxiter; i++)
{
Xsquare = X * X;
Ysquare = Y * Y;
denom = 3*((Xsquare-Ysquare)*(Xsquare-Ysquare) +
4*Xsquare*Ysquare);
if (denom < 0.0000001)
denom = 0.0000001;
X = .6666667*X + (Xsquare - Ysquare)/denom;
Y = .6666667*Y + 2*X*Y/denom;
if ((Xold==X) && (Yold==Y))
break;
} /* finbo sur maxiter */
if (X > 0)
{
Image_plotRGB(im, col, row, 0, 0, 0);
}
else
{
if (Y > 0)
Image_plotRGB(im, col, row, 255, 0, 0);
else
Image_plotRGB(im, col, row, 0, 0, 255);
}
}
if (0 == col%5)
fprintf(stderr, "newton 0: col %5d / %5d\r", col, im->width);
}
return 0;
}
/*::------------------------------------------------------------------::*/
/*
* C'est pas encore fini ce truc ?
*/
int GingerBreadMan(Image_Desc *im, int maxiter)
{
double x1, y1, x2, y2;
int iter;
x1 = 10.0;
y1 = 0.333;
for (iter=0; iter<maxiter; iter++)
{
x2 = 1.0 - y1 + abs(x1);
y2 = x1;
printf("%9g %9g\n", x2, y2);
x1 = x2;
y1 = y2;
}
return 0;
}
/*::------------------------------------------------------------------::*/
/*
En fait, il faudrait travailler sur deux images...
*/
int Image_Random_Walker_0(Image_Desc *im, Image_Desc *dst,
int nbpass, int nbsteps)
{
int pass, step, foo;
int x, y, ra, ga, ba, rb, gb, bb;
if ( (foo=Image_compare_desc(im, dst)) )
{
fprintf(stderr, "Random_Walker_0: images are differents %d\n", foo);
return foo;
}
for (pass=0; pass<nbpass; pass++)
{
x = rand() % im->width;
y = rand() % im->height;
ra = Image_R_pixel(im, x, y);
ga = Image_G_pixel(im, x, y);
ba = Image_B_pixel(im, x, y);
/* printf("\tP%d\t\tX%d\tY%d\t%d,%d,%d\n", pass, x, y, ra, ga, ba); */
for (step=0; step<nbsteps; step++)
{
x += (rand()%3)-1;
if (x<0) x += im->width;
if (x>=im->width) x -= im->width;
y += (rand()%3)-1;
if (y<0) y += im->height;
if (y>=im->height) y -= im->height;
rb = Image_R_pixel(im, x, y);
gb = Image_G_pixel(im, x, y);
bb = Image_B_pixel(im, x, y);
Image_plotRGB(dst, x, y,
(ra+rb+rb)/3, (ga+gb+gb)/3, (ba+bb+bb)/3);
}
}
return 0;
}
/*::------------------------------------------------------------------::*/
#define XMIN (-1.5)
#define XMAX (1.5)
#define YMIN (-1.5)
#define YMAX (1.5)
int Image_Julia_0_0(Image_Desc *im, RGB_map *pmap, int fuzz,
double cx, double cy)
{
int col, row;
double deltaX, deltaY, dx, dy, x2, y2;
long debut, fin;
int iter, r, g, b, maxiter;
debut = time(NULL);
fprintf(stderr, "Julia_0_0: %dx%d\n", im->width, im->height);
deltaX = (XMAX - XMIN) / im->width;
deltaY = (YMAX - YMIN) / im->height;
maxiter = 0;
/*
* si pas de palette définie, en créer une ?
*/
for (row=0; row<im->height; row++)
{
dy = YMIN + (double)row * deltaY;
for (col=0; col<im->width; col++)
{
#if DEBUG_LEVEL
printf("%5d %5d ", row, col);
#endif
dx = XMIN + (double)col * deltaX;
iter = 0;
x2 = y2 = 0.0;
while ( (iter < fuzz) &&
((x2 + y2) < 4.0) )
{
x2 = dx * dx;
y2 = dy * dy;
dx = 2 * dx * dy + cx;
dy = x2 - y2 + cy;
iter++;
}
if (iter > maxiter)
maxiter = iter;
if (iter >= fuzz)
{
r = g = b = 255;
}
else
{
r = pmap->red[iter%pmap->nbre];
g = pmap->green[iter%pmap->nbre];
b = pmap->blue[iter%pmap->nbre];
}
Image_plotRGB(im, col, row, r, g, b);
#if DEBUG_LEVEL
printf(" %3d \r", iter);
#endif
}
}
fin = time(NULL);
printf("duree du calcul: %ld secondes, maxiter: %d\n", fin-debut, maxiter);
return 0;
}
/*::------------------------------------------------------------------::*/
#define XA -2.0
#define XB 2.0
#define YA -2.0
#define YB 1.3
int Image_Mandelbrot_0(Image_Desc *image, int maxiter)
{
int Y, X;
int r, g, b;
double zr, zi, fx, fy, real, imag, fiter, dist2;
long debut, fin, temps; /* pour chronometrer */
int iter, out, foo;
double tmpr, tmpi;
debut = time(NULL);
out = 0;
for (Y=0; Y<image->height; Y++)
{
fprintf(stderr, "ligne %4d sur %d\r", Y, image->height);
fy = (double)Y;
real = ( fy / (double)image->height * (YB-YA) ) + YA;
for (X=0; X<image->width; X++)
{
fx = (double)X;
imag = ( fx / (double)image->width * (XB-XA) ) + XA;
iter = 0;
zr = zi = 0.0;
do
{
iter++;
dist2 = zr*zr + zi*zi;
if (dist2 > 4.0)
{
out++;
break;
}
/*
* calculer le mandelbrot
* ----------------------
* la formule est:
* z0 = 0 + 0i
* z1 = z0^2 + c;
* ...
*/
tmpr = zr*zr - zi*zi;
tmpi = 2.0 * zr * zi;
zr = tmpr + real;
zi = tmpi + imag;
} while (iter < maxiter);
fiter = (double)iter / (double)maxiter;
Image_color_x(zr, zi, &r, &g, &b);
Image_plotRGB(image, X, Y, r, g, b);
}
fflush(stderr);
}
fin = time(NULL);
temps = fin - debut;
if (temps < 500)
{
foo = 's';
}
else
{
foo = 'm';
temps /= 60;
}
printf("\nMandelbrot_0: temps d'execution = %ld %c\n", temps, foo);
printf("Mandelbrot_0: nombre de points dehors = %d\n", out);
return 0;
}
/*::------------------------------------------------------------------::*/
int Lorenz_Orbits(Image_Desc *img, int iters,
double a, double b, double c, double dt)
{
int pass;
double dx, dy, dz, dxp, dyp, dzp;
FILE *fp;
if (NULL == (fp=fopen("lorenz.dat", "w"))) {
perror("lorenz datafile");
exit(1);
}
fprintf(stderr, "%s ( %p %d / %f %f %f %f )\n", __func__, img, iters,
a, b, c, dt);
dx = dy = dz = 0.0001;
for (pass=0; pass<iters; pass++) {
fprintf(fp, "%6d %8f %8f %8f\n", pass, dx, dy, dz);
dxp = dx - (a*dx + a*dy) * dt;
dyp = dy + (b*dx - dy - dz*dz) * dt;
dzp = dz - (c*dz + dx*dy) * dt;
dx = dxp, dy = dyp, dz = dzp;
}
fclose(fp);
return 42;
}
/*::------------------------------------------------------------------::*/
/*
* et un PopCorn ?
*/
/*::------------------------------------------------------------------::*/
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