YouTube-simulations/particle_pinball.c

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/*********************************************************************************/
/* */
/* Animation of particles in billiard */
/* */
/* N. Berglund, december 2012, april 2021 */
/* UPDATE 14 April 21 : graphics files go to subfolder, */
/* Switch MOVIE to decide whether to create a movie */
/* UPDATE 3 May 21 : new domains */
/* */
/* Feel free to reuse, but if doing so it would be nice to drop a */
/* line to nils.berglund@univ-orleans.fr - Thanks! */
/* */
/* compile with */
/* gcc -o particle_billiard particle_billiard.c */
/* -O3 -L/usr/X11R6/lib -ltiff -lm -lGL -lGLU -lX11 -lXmu -lglut */
/* */
/* To make a video, set MOVIE to 1 and create subfolder tif_part */
/* It may be possible to increase parameter PAUSE */
/* */
/* create movie using */
/* ffmpeg -i part.%05d.tif -vcodec libx264 part.mp4 */
/* */
/*********************************************************************************/
#include <math.h>
#include <string.h>
#include <GL/glut.h>
#include <GL/glu.h>
#include <unistd.h>
#include <sys/types.h>
#include <tiffio.h> /* Sam Leffler's libtiff library. */
#define MOVIE 0 /* set to 1 to generate movie */
#define WINWIDTH 1280 /* window width */
#define WINHEIGHT 720 /* window height */
#define XMIN -4.0
#define XMAX 4.0 /* x interval */
#define YMIN -1.25
#define YMAX 3.25 /* y interval for 9/16 aspect ratio */
// #define XMIN -2.0
// #define XMAX 2.0 /* x interval */
// #define YMIN -1.125
// #define YMAX 1.125 /* y interval for 9/16 aspect ratio */
#define BOXYMIN -1.0
#define BOXYMAX 1.0 /* y dimensions of box (for circles in rectangle) */
#define SCALING_FACTOR 1.0 /* scaling factor of drawing, needed for flower billiards, otherwise set to 1.0 */
/* Choice of the billiard table, see global_particles.c */
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#define B_DOMAIN 23 /* choice of domain shape */
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#define CIRCLE_PATTERN 7 /* pattern of circles */
#define POLYLINE_PATTERN 1 /* pattern of polyline */
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// #define CIRCLE_PATTERN 21 /* pattern of circles */
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#define ABSORBING_CIRCLES 0 /* set to 1 for circular scatterers to be absorbing */
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#define NMAXCIRCLES 5000 /* total number of circles (must be at least NCX*NCY for square grid) */
#define NMAXPOLY 1000 /* total number of sides of polygonal line */
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#define NCX 44 /* number of circles in x direction */
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#define NCY 10 /* number of circles in y direction */
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#define NPOISSON 350 /* number of points for Poisson C_RAND_POISSON arrangement */
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#define NGOLDENSPIRAL 2000 /* max number of points for C_GOLDEN_SPIRAL arrandement */
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#define SDEPTH 1 /* Sierpinski gastket depth */
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#define LAMBDA 3.8 /* parameter controlling shape of domain */
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// #define MU 0.1 /* second parameter controlling shape of billiard */
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#define MU 0.07 /* second parameter controlling shape of billiard */
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// #define MU 0.085 /* second parameter controlling shape of billiard */
// #define MU 0.09 /* second parameter controlling shape of billiard */
// #define MU 0.034 /* second parameter controlling shape of billiard */
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#define FOCI 1 /* set to 1 to draw focal points of ellipse */
#define NPOLY 4 /* number of sides of polygon */
#define APOLY 0.5 /* angle by which to turn polygon, in units of Pi/2 */
#define DRAW_BILLIARD 1 /* set to 1 to draw billiard */
#define DRAW_CONSTRUCTION_LINES 0 /* set to 1 to draw additional construction lines for billiard */
#define PERIODIC_BC 0 /* set to 1 to enforce periodic boundary conditions when drawing particles */
#define RESAMPLE 0 /* set to 1 if particles should be added when dispersion too large */
#define DEBUG 0 /* draw trajectories, for debugging purposes */
/* Simulation parameters */
#define NPART 1 /* number of particles */
#define NPARTMAX 100000 /* maximal number of particles after resampling */
#define LMAX 0.01 /* minimal segment length triggering resampling */
#define DMIN 0.02 /* minimal distance to boundary for triggering resampling */
#define CYCLE 1 /* set to 1 for closed curve (start in all directions) */
#define SHOWTRAILS 0 /* set to 1 to keep trails of the particles */
#define TEST_ACTIVE 0 /* set to 1 to test whether particle is in billiard */
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#define NSTEPS 10400 /* number of frames of movie */
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// #define NSTEPS 1000 /* number of frames of movie */
// #define TIME 1500 /* time between movie frames, for fluidity of real-time simulation */
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#define TIME 4000 /* time between movie frames, for fluidity of real-time simulation */
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// #define DPHI 0.0001 /* integration step */
// #define DPHI 0.00002 /* integration step */
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#define DPHI 0.00007 /* integration step */
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// #define DPHI 0.000035 /* integration step */
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#define NVID 150 /* number of iterations between images displayed on screen */
/* Decreasing TIME accelerates the animation and the movie */
/* For constant speed of movie, TIME*DPHI should be kept constant */
/* However, increasing DPHI too much deterioriates quality of simulation */
/* NVID tells how often a picture is drawn in the animation, increase it for faster anim */
/* For a good quality movie, take for instance TIME = 400, DPHI = 0.00005, NVID = 100 */
/* Colors and other graphical parameters */
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#define COLOR_PALETTE 1 /* Color palette, see list in global_pdes.c */
// #define NCOLORS 256 /* number of colors */
#define NCOLORS 48 /* number of colors */
#define COLORSHIFT 2 /* hue of initial color */
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#define RAINBOW_COLOR 1 /* set to 1 to use different colors for all particles */
#define SINGLE_COLOR 1 /* set to 1 to make all particles a single color */
#define FLOWER_COLOR 0 /* set to 1 to adapt initial colors to flower billiard (tracks vs core) */
#define NSEG 100 /* number of segments of boundary */
#define LENGTH 0.1 /* length of velocity vectors */
#define BILLIARD_WIDTH 2 /* width of billiard */
#define PARTICLE_WIDTH 4 /* width of particles */
#define FRONT_WIDTH 3 /* width of wave front */
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// #define COLOR_TRAJECTORY 0 /* hue for single color */
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#define COLOR_TRAJECTORY 8 /* hue for single color */
#define BLACK 1 /* set to 1 for black background */
#define COLOR_OUTSIDE 0 /* set to 1 for colored outside */
#define OUTER_COLOR 270.0 /* color outside billiard */
#define PAINT_INT 0 /* set to 1 to paint interior in other color (for polygon/Reuleaux) */
#define PAINT_EXT 0 /* set to 1 to paint exterior in other color */
#define ERASE_OUTSIDE 1 /* set to 1 to erase outside of rectangular billiard (beta) */
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#define PAUSE 500 /* number of frames after which to pause */
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#define PSLEEP 5 /* sleep time during pause */
#define SLEEP1 1 /* initial sleeping time */
#define SLEEP2 1000 /* final sleeping time */
#define END_FRAMES 100 /* number of still frames at end of movie */
#define NPATHBINS 200 /* number of bins for path length histogramm */
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#define PATHLMAX 1.8 /* max free path on graph */
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#include "global_particles.c"
#include "sub_part_billiard.c"
#include "sub_part_pinball.c"
int ncol = 0, nobst = 0, nmaxpeg = 0;
int npath[NPATHBINS];
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double max_free_path = 0.0;
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/*********************/
/* animation part */
/*********************/
void init_boundary_config(double smin, double smax, double anglemin, double anglemax, double *configs[NPARTMAX])
/* initialize configuration: drop on the boundary, beta version */
/* WORKS FOR ELLIPSE, HAS TO BE ADAPTED TO GENERAL BILLIARD */
{
int i;
double ds, da, s, angle, theta, alpha, pos[2];
if (anglemin <= 0.0) anglemin = PI/((double)NPART);
if (anglemax >= PI) anglemax = PI*(1.0 - 1.0/((double)NPART));
ds = (smax - smin)/((double)NPART);
da = (anglemax - anglemin)/((double)NPART);
for (i=0; i<NPART; i++)
{
s = smin + ds*((double)i);
angle = anglemin + da*((double)i),
pos[0] = LAMBDA*cos(s);
pos[1] = sin(s);
theta = argument(-LAMBDA*pos[1], pos[0]/LAMBDA);
alpha = theta + angle;
vbilliard_xy(configs[i], alpha, pos);
}
}
void init_drop_config(double x0, double y0, double angle1, double angle2, double *configs[NPARTMAX])
/* initialize configuration: drop at (x0,y0) */
{
int i;
double dalpha, alpha;
double conf[2], pos[2];
while (angle2 < angle1) angle2 += DPI;
if (NPART > 1) dalpha = (angle2 - angle1)/((double)(NPART-1));
else dalpha = 0.0;
for (i=0; i<NPART; i++)
{
alpha = angle1 + dalpha*((double)i);
// printf("alpha=%.5lg\n", alpha);
pos[0] = x0;
pos[1] = y0;
vbilliard_xy(configs[i], alpha, pos);
}
}
void init_sym_drop_config(double x0, double y0, double angle1, double angle2, double *configs[NPARTMAX])
/* initialize configuration with two symmetric partial drops */
{
int i;
double dalpha, alpha, meanangle;
double conf[2], pos[2];
while (angle2 < angle1) angle2 += DPI;
meanangle = 0.5*(angle1 + angle2);
dalpha = (angle2 - angle1)/((double)(NPART-1));
for (i=0; i<NPART/2; i++)
{
alpha = meanangle + dalpha*((double)i);
pos[0] = x0;
pos[1] = y0;
vbilliard_xy(configs[i], alpha, pos);
}
for (i=0; i<NPART/2; i++)
{
alpha = meanangle - dalpha*((double)i);
pos[0] = x0;
pos[1] = y0;
vbilliard_xy(configs[NPART/2 + i], alpha, pos);
}
}
void init_line_config(double x0, double y0, double x1, double y1, double angle, double *configs[NPARTMAX])
/* initialize configuration: line (x0,y0)-(x1,y1) in direction alpha */
{
int i;
double dx, dy;
double conf[2], pos[2];
dx = (x1-x0)/((double)(NPART));
dy = (y1-y0)/((double)(NPART));
// dx = (x1-x0)/((double)(NPART-1));
// dy = (y1-y0)/((double)(NPART-1));
for (i=0; i<NPART; i++)
{
pos[0] = x0 + ((double)i)*dx;
pos[1] = y0 + ((double)i)*dy;
vbilliard_xy(configs[i], angle, pos);
}
}
void draw_config_showtrails(int color[NPARTMAX], double *configs[NPARTMAX], int active[NPARTMAX])
/* draw the particles */
{
int i;
double x0, y0, x1, y1, x2, y2, cosphi, sinphi, rgb[3], len;
glutSwapBuffers();
if (PAINT_INT) paint_billiard_interior();
glLineWidth(PARTICLE_WIDTH);
glEnable(GL_LINE_SMOOTH);
for (i=0; i<nparticles; i++)
{
// if (configs[i][2]<0.0)
// {
// vbilliard(configs[i]);
// if (!RAINBOW_COLOR)
// {
// color[i]++;
// if (color[i] >= NCOLORS) color[i] -= NCOLORS;
// }
// }
configs[i][2] += DPHI;
cosphi = (configs[i][6] - configs[i][4])/configs[i][3];
sinphi = (configs[i][7] - configs[i][5])/configs[i][3];
len = configs[i][2] + LENGTH;
if (len > configs[i][3]) len = configs[i][3];
x0 = configs[i][4];
y0 = configs[i][5];
x1 = configs[i][4] + configs[i][2]*cosphi;
y1 = configs[i][5] + configs[i][2]*sinphi;
x2 = configs[i][4] + len*cosphi;
y2 = configs[i][5] + len*sinphi;
/* test whether particle does not escape billiard */
if ((TEST_ACTIVE)&&(active[i])) active[i] = xy_in_billiard(x1, y1);
if (active[i])
{
rgb_color_scheme(color[i], rgb);
glColor3f(rgb[0], rgb[1], rgb[2]);
glBegin(GL_LINE_STRIP);
glVertex2d(SCALING_FACTOR*x0, SCALING_FACTOR*y0);
glVertex2d(SCALING_FACTOR*x2, SCALING_FACTOR*y2);
glEnd ();
}
// if (configs[i][2] > configs[i][3] - DPHI)
// {
// glBegin(GL_LINE_STRIP);
// glVertex2d(SCALING_FACTOR*x0, SCALING_FACTOR*y0);
// glVertex2d(SCALING_FACTOR*configs[i][6], SCALING_FACTOR*configs[i][7]);
// glEnd ();
// }
}
if (DRAW_BILLIARD) draw_billiard();
}
void draw_config(int color[NPARTMAX], double *configs[NPARTMAX], int active[NPARTMAX])
/* draw the particles */
{
int i;
double x0, y0, x1, y1, x2, y2, cosphi, sinphi, rgb[3];
glutSwapBuffers();
if (!SHOWTRAILS) blank();
if (PAINT_INT) paint_billiard_interior();
glLineWidth(PARTICLE_WIDTH);
glEnable(GL_LINE_SMOOTH);
for (i=0; i<nparticles; i++)
{
// if (configs[i][2]<0.0)
// {
// vbilliard(configs[i]);
// if (!RAINBOW_COLOR)
// {
// color[i]++;
// if (color[i] >= NCOLORS) color[i] -= NCOLORS;
// }
// }
configs[i][2] += DPHI;
cosphi = (configs[i][6] - configs[i][4])/configs[i][3];
sinphi = (configs[i][7] - configs[i][5])/configs[i][3];
x1 = configs[i][4] + configs[i][2]*cosphi;
y1 = configs[i][5] + configs[i][2]*sinphi;
x2 = configs[i][4] + (configs[i][2] + LENGTH)*cosphi;
y2 = configs[i][5] + (configs[i][2] + LENGTH)*sinphi;
/* test whether particle does not escape billiard */
if ((TEST_ACTIVE)&&(active[i])) active[i] = xy_in_billiard(x1, y1);
if (active[i])
{
rgb_color_scheme(color[i], rgb);
glColor3f(rgb[0], rgb[1], rgb[2]);
glBegin(GL_LINE_STRIP);
glVertex2d(SCALING_FACTOR*x1, SCALING_FACTOR*y1);
glVertex2d(SCALING_FACTOR*x2, SCALING_FACTOR*y2);
glEnd ();
/* taking care of boundary conditions - only needed for periodic boundary conditions */
if (PERIODIC_BC)
{
if (SCALING_FACTOR*x2 > XMAX)
{
glBegin(GL_LINE_STRIP);
glVertex2d(SCALING_FACTOR*(x1+XMIN-XMAX), SCALING_FACTOR*y1);
glVertex2d(SCALING_FACTOR*(x2+XMIN-XMAX), SCALING_FACTOR*y2);
glEnd ();
}
if (SCALING_FACTOR*x2 < XMIN)
{
glBegin(GL_LINE_STRIP);
glVertex2d(SCALING_FACTOR*(x1-XMIN+XMAX), SCALING_FACTOR*y1);
glVertex2d(SCALING_FACTOR*(x2-XMIN+XMAX), SCALING_FACTOR*y2);
glEnd ();
}
if (SCALING_FACTOR*y2 > YMAX)
{
glBegin(GL_LINE_STRIP);
glVertex2d(SCALING_FACTOR*x1, SCALING_FACTOR*(y1+YMIN-YMAX));
glVertex2d(SCALING_FACTOR*x2, SCALING_FACTOR*(y2+YMIN-YMAX));
glEnd ();
}
if (SCALING_FACTOR*y2 < YMIN)
{
glBegin(GL_LINE_STRIP);
glVertex2d(SCALING_FACTOR*x1, SCALING_FACTOR*(y1+YMAX-YMIN));
glVertex2d(SCALING_FACTOR*x2, SCALING_FACTOR*(y2+YMAX-YMIN));
glEnd ();
}
}
}
/* draw trajectories, for debugging purpose */
if (DEBUG)
{
glLineWidth(1.0);
glBegin(GL_LINES);
glVertex2d(SCALING_FACTOR*configs[i][4], SCALING_FACTOR*configs[i][5]);
glVertex2d(SCALING_FACTOR*configs[i][6], SCALING_FACTOR*configs[i][7]);
glEnd ();
glLineWidth(3.0);
}
// if (configs[i][2] > configs[i][3] - DPHI) configs[i][2] -= configs[i][3];
}
if (DRAW_BILLIARD) draw_billiard();
}
void graph_movie(int time, int color[NPARTMAX], double *configs[NPARTMAX], int active[NPARTMAX])
/* compute next movie frame */
{
int i, j, k, c;
double rgb[3];
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static double total_pathlength = 0.0;
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for (j=0; j<time; j++)
{
for (i=0; i<nparticles; i++)
{
if (configs[i][2]<0.0)
{
// printf("reflecting particle %i\n", i);
if ((SHOWTRAILS)&&(active[i]))
{
glLineWidth(PARTICLE_WIDTH);
rgb_color_scheme(color[i], rgb);
glColor3f(rgb[0], rgb[1], rgb[2]);
glBegin(GL_LINE_STRIP);
glVertex2d(SCALING_FACTOR*configs[i][4], SCALING_FACTOR*configs[i][5]);
glVertex2d(SCALING_FACTOR*configs[i][6], SCALING_FACTOR*configs[i][7]);
glEnd ();
}
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total_pathlength += configs[i][3];
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c = vbilliard(configs[i]);
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/* update number of collisions, not counting boundary for periodic b.c. */
if (B_DOMAIN != D_CIRCLES_IN_TORUS) ncol++;
else if (c >= 0) ncol++;
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if ((c >= 0)&&(circles[c].color == 0)) nobst++;
circles[c].color++;
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/* take care of circles doubled because of periodic boundary conditions */
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if ((circles[c].active)&&(B_DOMAIN == D_CIRCLES_IN_TORUS)&&(circles[c].partner != c)) circles[circles[c].partner].color++;
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circles[c].new = 10;
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/* update free path statistics */
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if (ncol > 1) /* disregard very first collision */
{
if (B_DOMAIN != D_CIRCLES_IN_TORUS)
{
k = (int)((double)NPATHBINS*configs[i][3]/PATHLMAX);
if (k < NPATHBINS) npath[k]++;
if (total_pathlength > max_free_path) max_free_path = total_pathlength;
total_pathlength = 0.0;
}
else /* case with periodic boundary conditions */
{
if (c >= 0) /* a circle is hit, update histogram */
{
// printf("total path length %.3lg\n", total_pathlength);
k = (int)((double)NPATHBINS*total_pathlength/PATHLMAX);
if (k < NPATHBINS) npath[k]++;
if (total_pathlength > max_free_path) max_free_path = total_pathlength;
total_pathlength = 0.0;
}
}
}
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if (!RAINBOW_COLOR)
{
color[i]++;
if (color[i] >= NCOLORS) color[i] -= NCOLORS;
}
}
configs[i][2] += DPHI;
if (configs[i][2] > configs[i][3] - DPHI)
{
configs[i][2] -= configs[i][3];
}
}
}
// draw_config(color, configs);
}
void print_particle_numbers(double *configs[NPARTMAX])
{
char message[50], message1[50];
double cosphi, x1;
static double rgb[3], xleft, xright;
static short int first = 1;
int i, nleft = 0, nmid = 0, nright = 0;
rgb[0] = 0.0; rgb[1] = 0.0; rgb[2] = 0.0;
if (first) /* compute box limits */
{
/* find leftmost and rightmost circle */
for (i=0; i<ncircles; i++)
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if ((circles[i].active)&&(circles[i].xc - circles[i].radius < xleft)) xleft = circles[i].xc - circles[i].radius;
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for (i=0; i<ncircles; i++)
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if ((circles[i].active)&&(circles[i].xc + circles[i].radius > xright)) xright = circles[i].xc + circles[i].radius;
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first = 0;
printf("xleft = %.3lg, xright = %.3lg", xleft, xright);
}
for (i=0; i<nparticles; i++)
{
cosphi = (configs[i][6] - configs[i][4])/configs[i][3];
x1 = configs[i][4] + configs[i][2]*cosphi;
if (x1 > xright) nright++;
else if (x1 < xleft) nleft++;
else nmid++;
// if (i == nparticles-1) printf("x1 = %.3lg, nleft = %i, nright = %i\n", x1, nleft, nright);
}
erase_area(XMIN + 0.31, YMIN + 0.07, 0.24, 0.05, rgb);
sprintf(message, "%4d particles", nleft);
glColor3f(1.0, 1.0, 1.0);
write_text_fixedwidth(XMIN + 0.1, YMIN + 0.04, message);
erase_area(0.0, YMIN + 0.07, 0.24, 0.05, rgb);
sprintf(message, "%4d particles", nmid);
glColor3f(1.0, 1.0, 1.0);
write_text_fixedwidth(-0.21, YMIN + 0.04, message);
erase_area(XMAX - 0.29, YMIN + 0.07, 0.24, 0.05, rgb);
sprintf(message, "%4d particles", nright);
glColor3f(1.0, 1.0, 1.0);
write_text_fixedwidth(XMAX - 0.5, YMIN + 0.04, message);
}
void draw_statistics()
{
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int i, n, colmax = 55, pegcollisions[90], nypegs = 70, meanpegs = 0, meansquarepegs = 0, total_coll = 0, ymax = 0,
meanbins = 0, meansquarebins, total_bin = 0, stephits = 10, tickstephits = 1;
double x, y, yscale = 110.0, y0, dx, rgb[3], xshift, coll_mean, coll_stdv, path_mean, path_stdv, ebin, len_over_bin,
steppath = 0.5;
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char message[50];
glLineWidth(1);
y0 = 0.5*(YMAX + YMIN) + 0.2;
dx = (XMAX-0.6)/(double)colmax;
xshift = XMIN + 0.3;
rgb[0] = 0.0; rgb[1] = 0.0; rgb[2] = 1.0;
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/* histogram of number of collisions per peg */
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for (i=0; i<colmax; i++) pegcollisions[i] = 0;
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for (i=0; i<ncircles; i++) if ((circles[i].active)&&(!circles[i].double_circle))
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{
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n = circles[i].color;
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if (n < colmax) pegcollisions[n]++;
}
for (i=1; i<colmax; i++)
{
total_coll += pegcollisions[i];
meanpegs += i*pegcollisions[i];
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meansquarepegs += i*i*pegcollisions[i];
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}
for (i=1; i<colmax; i++)
{
x = xshift + (double)i*dx;
y = y0 + (double)pegcollisions[i]*YMAX/yscale;
rgb_color_scheme(i, rgb);
erase_rectangle(x, y0, x+dx, y, rgb);
}
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_LINE_STRIP);
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/* histogram */
for (i=0; i<colmax; i++)
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{
x = xshift + (double)i*dx;
y = y0 + (double)pegcollisions[i]*YMAX/yscale;
glVertex2d(x, y0);
glVertex2d(x, y);
glVertex2d(x+dx, y);
glVertex2d(x+dx, y0);
glVertex2d(x, y0);
}
glVertex2d(xshift, y0);
glVertex2d(xshift, y0 + (double)nypegs*YMAX/yscale);
glEnd ();
/* graduation and labels */
for (i=10; i<nypegs; i+=10)
{
glBegin(GL_LINE_STRIP);
glVertex2d(xshift - 0.025, y0 + (double)i*YMAX/yscale);
glVertex2d(xshift + 0.025, y0 + (double)i*YMAX/yscale);
glEnd ();
}
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for (i=tickstephits; i<colmax; i+=tickstephits)
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{
glBegin(GL_LINE_STRIP);
glVertex2d(xshift + (double)i*dx, y0 - 0.025);
glVertex2d(xshift + (double)i*dx, y0 + 0.025);
glEnd ();
}
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for (i=stephits; i<nypegs - stephits; i+=stephits)
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{
sprintf(message, "%4d", i);
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write_text_fixedwidth(xshift + (double)i*dx - 0.15, y0 - 0.12, message);
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}
for (i=10; i<nypegs; i+=10)
{
sprintf(message, "%4d", i);
write_text_fixedwidth(xshift - 0.3, y0 - 0.025 + (double)i*YMAX/yscale, message);
}
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coll_mean = (double)meanpegs/(double)total_coll;
coll_stdv = sqrt((double)meansquarepegs/(double)total_coll - coll_mean*coll_mean);
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sprintf(message, "hits");
write_text_fixedwidth(xshift + (double)(colmax-3)*dx, y0 - 0.12, message);
sprintf(message, "pegs");
write_text_fixedwidth(xshift - 0.25, y0 - 0.025 + (double)(nypegs - 3)*YMAX/yscale, message);
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// sprintf(message, "Mean %.4lg", (double)meanpegs/(double)total_coll);
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sprintf(message, "Max hits/peg %d", nmaxpeg);
write_text(-1.5, YMAX - 0.3, message);
sprintf(message, "Mean hits/peg %.4lg", coll_mean);
write_text(-1.5, YMAX - 0.5, message);
sprintf(message, "Stdv hits/peg %.4lg", coll_stdv);
write_text(-1.5, YMAX - 0.7, message);
/* histogram of path lengths */
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for (i=1; i<NPATHBINS; i++)
{
if (npath[i] > ymax) ymax = npath[i];
total_bin += npath[i];
meanbins += i*npath[i];
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meansquarebins += i*i*npath[i];
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}
yscale = 0.9*(YMAX-y0)*(double)ymax;
dx = (XMAX-0.6)/(double)NPATHBINS;
xshift = 0.3;
rgb[0] = 1.0; rgb[1] = 0.0; rgb[2] = 0.0;
for (i=1; i<NPATHBINS; i++)
{
x = xshift + (double)i*dx;
y = y0 + (double)npath[i]*YMAX/yscale;
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if (y > y0) erase_rectangle(x, y0, x+dx, y, rgb);
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}
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_LINE_STRIP);
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/* histogram */
for (i=1; i<NPATHBINS; i++) if (npath[i] > 0)
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{
x = xshift + (double)i*dx;
y = y0 + (double)npath[i]*YMAX/yscale;
glVertex2d(x, y0);
glVertex2d(x, y);
glVertex2d(x+dx, y);
glVertex2d(x+dx, y0);
glVertex2d(x, y0);
}
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glEnd ();
glBegin(GL_LINE_STRIP);
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glVertex2d(xshift, YMAX - 0.1);
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glVertex2d(xshift, y0);
glVertex2d(xshift + (double)NPATHBINS*dx, y0);
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glEnd ();
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for (x = steppath; x < PATHLMAX; x+=steppath)
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{
i = (int)(x*(double)NPATHBINS/PATHLMAX);
sprintf(message, "%.2f", x);
write_text_fixedwidth(xshift + (double)i*dx - 0.1, y0 - 0.12, message);
}
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for (x = steppath; x < PATHLMAX; x+=steppath)
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{
i = (int)(x*(double)NPATHBINS/PATHLMAX);
glBegin(GL_LINE_STRIP);
glVertex2d(xshift + (double)i*dx, y0 - 0.025);
glVertex2d(xshift + (double)i*dx, y0 + 0.025);
glEnd ();
}
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ebin = (double)meanbins/(double)total_bin; /* mean bin */
len_over_bin = PATHLMAX/(double)NPATHBINS; /* conversion from bin to path length */
path_mean = ebin*len_over_bin; /* mean free path */
path_stdv = sqrt((double)meansquarebins/(double)total_bin - ebin*ebin)*len_over_bin;
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sprintf(message, "free path");
write_text_fixedwidth(XMAX - 0.6, y0 - 0.12, message);
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sprintf(message, "Max free path %.4lg", max_free_path);
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write_text(2.2, YMAX - 0.3, message);
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sprintf(message, "Mean free path %.4lg", path_mean);
write_text(2.2, YMAX - 0.5, message);
sprintf(message, "Stdv free path %.4lg", path_stdv);
write_text(2.2, YMAX - 0.7, message);
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}
void animation(int circle_config)
{
double time, dt, alpha, r;
double *configs[NPARTMAX];
int i, j, resamp = 1, s, i1, i2;
int *color, *newcolor, *active;
char message[50];
/* Since NPARTMAX can be big, it seemed wiser to use some memory allocation here */
color = malloc(sizeof(int)*(NPARTMAX));
newcolor = malloc(sizeof(int)*(NPARTMAX));
active = malloc(sizeof(int)*(NPARTMAX));
for (i=0; i<NPARTMAX; i++)
configs[i] = (double *)malloc(8*sizeof(double));
/* init circle configuration if the domain is D_CIRCLES */
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// if ((B_DOMAIN == D_CIRCLES)||(B_DOMAIN == D_CIRCLES_IN_RECT)||(B_DOMAIN == D_CIRCLES_IN_GENUSN)
// ||(B_DOMAIN == D_CIRCLES_IN_TORUS))
// init_circle_config_pinball(circle_config);
/* init circle configuration if the domain is D_CIRCLES */
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if ((B_DOMAIN == D_CIRCLES)||(B_DOMAIN == D_CIRCLES_IN_RECT)||(B_DOMAIN == D_CIRCLES_IN_GENUSN)
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||(B_DOMAIN == D_CIRCLES_IN_TORUS)) init_circles_pinball(circle_config, circles);
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/* remove discs that are not in domain */
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if ((B_DOMAIN == D_CIRCLES_IN_RECT)||(B_DOMAIN == D_CIRCLES_IN_GENUSN))
// ||(B_DOMAIN == D_CIRCLES_IN_TORUS))
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for (i=0; i<ncircles; i++)
{
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if (vabs(circles[i].xc) + circles[i].radius > 0.99) circles[i].active = 0;
if (vabs(circles[i].xc) + circles[i].radius > 0.99*LAMBDA) circles[i].active = 0;
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}
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else if (B_DOMAIN == D_CIRCLES_IN_TORUS)
for (i=0; i<ncircles; i++)
{
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if (vabs(circles[i].yc) - circles[i].radius > 1.0) circles[i].active = 0;
if (vabs(circles[i].xc) - circles[i].radius > LAMBDA) circles[i].active = 0;
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}
// for (i=0; i<ncircles; i++)
// printf("Circle %i at (%.2f, %.2f), double %i, partner %i\n", i, circlex[i], circley[i], double_circle[i], partner_circle[i]);
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// if (vabs(circley[i]) > 1.0) circleactive[i] = 0;
/* initialize system by putting particles in a given point with a range of velocities */
r = cos(PI/(double)NPOLY)/cos(DPI/(double)NPOLY);
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// init_drop_config(0.4, 0.0, PID, 0.5*PID, configs);
init_drop_config(0.0, 0.0, -0.45*PID, 0.45*PID, configs);
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// init_line_config(-1.25, -0.5, -1.25, 0.5, 0.0, configs);
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// init_drop_config(0.5, 0.1, -0.5*PID, 0.5*PID, configs);
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// init_drop_config(-1.4, 0.0, -0.5*PID, 0.5*PID, configs);
// init_drop_config(0.5, 0.5, -1.0, 1.0, configs);
// init_sym_drop_config(-1.0, 0.5, -PID, PID, configs);
// init_drop_config(-0.999, 0.0, -alpha, alpha, configs);
// other possible initial conditions :
// init_line_config(0.0, -0.5, 0.0, 0.5, 0.0, configs);
// init_line_config(-1.25, -0.5, -1.25, 0.5, 0.0*PID, configs);
// init_line_config(-1.0, -0.3, -1.0, 0.3, 0.0, configs);
// init_line_config(-0.7, -0.45, -0.7, 0.45, 0.0, configs);
// init_line_config(-1.5, 0.1, -0.1, 1.0, -0.5*PID, configs);
// if (!SHOWTRAILS) blank();
blank();
glColor3f(0.0, 0.0, 0.0);
if (DRAW_BILLIARD) draw_billiard();
if (ERASE_OUTSIDE) erase_rectangle_outside(270.0, 0.1, 0.15);
// print_particle_numbers(configs);
glutSwapBuffers();
// if (MOVIE)
// {
// for (i=0; i<20; i++) save_frame();
// s = system("mv part*.tif tif_part/");
// }
for (i=0; i<NPARTMAX; i++)
{
color[i] = 0;
newcolor[i] = 0;
active[i] = 1;
}
if (FLOWER_COLOR) /* adapt color scheme to flower configuration (beta implementation) */
{
// i1 = (int)((double)NPART*0.2538); /* the 0.27 is just a trial-and-error guess, to be improved */
// i1 = (int)((double)NPART*0.1971); /* the 0.27 is just a trial-and-error guess, to be improved */
i1 = (int)((double)NPART*0.3015); /* the 0.27 is just a trial-and-error guess, to be improved */
i2 = NPART-i1;
for (i=i1; i<i2; i++)
{
color[i] += NCOLORS/3;
newcolor[i] = NCOLORS/3;
}
for (i=i2; i<NPART; i++)
{
color[i] += 2*NCOLORS/3;
newcolor[i] = 2*NCOLORS/3;
}
}
if (RAINBOW_COLOR) /* rainbow color scheme */
for (i=0; i<NPART; i++)
{
color[i] = (i*NCOLORS)/NPART;
newcolor[i] = (i*NCOLORS)/NPART;
}
if (SINGLE_COLOR)
for (i=0; i<NPART; i++)
{
color[i] = COLOR_TRAJECTORY;
newcolor[i] = COLOR_TRAJECTORY;
}
for (i=0; i<NPATHBINS; i++) npath[i] = 0;
sleep(SLEEP1);
for (i=0; i<=NSTEPS; i++)
{
graph_movie(TIME, newcolor, configs, active);
if (SHOWTRAILS) draw_config_showtrails(newcolor, configs, active);
else draw_config(newcolor, configs, active);
if (DRAW_BILLIARD) draw_billiard();
if (ERASE_OUTSIDE) erase_rectangle_outside(270.0, 0.1, 0.15);
// print_particle_numbers(configs);
sprintf(message, "%d collisions", ncol);
glColor3f(1.0, 1.0, 1.0);
write_text(XMIN + 0.6, YMIN + 0.08, message);
// write_text(XMIN + 0.3, YMIN + 0.04, message);
sprintf(message, "%d pegs hit", nobst);
glColor3f(1.0, 1.0, 1.0);
write_text(XMAX-1.4, YMIN + 0.08, message);
// write_text(XMAX-0.7, YMIN + 0.04, message);
/* count max number a peg is hit */
nmaxpeg = 0;
for (j=0; j<ncircles; j++)
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if (circles[j].color > nmaxpeg) nmaxpeg = circles[j].color;
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// sprintf(message, "max hits per peg: %d", nmaxpeg);
// glColor3f(1.0, 1.0, 1.0);
// write_text(-0.6, YMIN + 0.08, message);
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// write_text(-0.3, YMIN + 0.04, message);
draw_statistics();
for (j=0; j<NPARTMAX; j++) color[j] = newcolor[j];
if (MOVIE)
{
save_frame();
/* it seems that saving too many files too fast can cause trouble with the file system */
/* so this is to make a pause from time to time - parameter PAUSE may need adjusting */
if (i % PAUSE == PAUSE - 1)
{
printf("Making a short pause\n");
sleep(PSLEEP);
s = system("mv part*.tif tif_part/");
}
}
}
if (MOVIE)
{
for (i=0; i<END_FRAMES; i++) save_frame();
printf("Making a short pause\n");
sleep(PSLEEP);
s = system("mv part*.tif tif_part/");
}
free(color);
free(newcolor);
for (i=0; i<NPARTMAX; i++) free(configs[i]);
}
void display(void)
{
glPushMatrix();
blank();
if (!SHOWTRAILS)
{
glutSwapBuffers();
blank();
glutSwapBuffers();
}
animation(CIRCLE_PATTERN);
// animation(C_TRI);
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// animation(C_GOLDEN_SPIRAL);
// animation(C_SQUARE);
// animation(C_HEX);
// animation(C_GOLDEN_MEAN);
// animation(C_RAND_DISPLACED);
// animation(C_POISSON_DISC);
// animation(C_RAND_POISSON);
sleep(SLEEP2);
glPopMatrix();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
if (SHOWTRAILS) glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
else glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
// glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize(WINWIDTH,WINHEIGHT);
glutCreateWindow("Billiard animation");
init();
glutDisplayFunc(display);
glutMainLoop();
return 0;
}