c/spiral.c

   1 /*
   2  * Compile with:
   3  * gcc -lm aclox.c -o aclox; ./aclox
   4  * or
   5  * CFLAGS='-lm' make aclox; ./aclox
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <math.h>
  12 #include <time.h>
  13
  14 //config
  15 #define HOUR_NUMBERS 1
  16 #define HI_PRECISION 1
  17 #define SHOW_DIGITS 1
  18 #define MINUTE_DOTS 1
  19 #define SMOOTH_MOTION 1
  20 #define zoom 2
  21
  22 //useful macros
  23 #define max(a,b) ((a)>=(b)?(a):(b))
  24 #define min(a,b) ((a)<=(b)?(a):(b))
  25 #define PI 3.141592654
  26 #define deg2rad(a) (((a)/180)*PI)
  27 //phi = angle, r = length
  28 #define polar2x(phi, r) ((r) * cos(deg2rad(phi)))
  29 #define polar2y(phi, r) ((r) * sin(deg2rad(phi)))
  30 #define cls() printf("\033[2J")
  31 #define top() printf("\033[0;0H")
  32
  33 int llines = -1, lcols = -1;
  34 void render_clock(double a) {
  35         //colors
  36         char color_empty = ' ';
  37         char color_s = '*';
  38         char color_center = 'o';
  39
  40         //get size of terminal
  41         static int lines = -1;
  42         static int cols = -1;
  43         if(lines < 7 || cols < 7) {
  44                 FILE *p;
  45                 p = popen("stty size", "r");
  46                 fscanf(p, "%d %d", &lines, &cols);
  47                 close((int)p);
  48         }
  49
  50         //calculate size
  51         int size = 40;
  52         size = min(lines,cols/zoom);
  53         size = ((size%2)==0?size-1:size); //make size odd
  54         //printf("%d\n", size);
  55
  56         //empty canvas
  57         char cifernik[size*zoom][size];
  58         int i, x, y;
  59         double phi, r;
  60         for(y=0;y<size;y++) for(x=0;x<(size*zoom);x++) cifernik[x][y] = color_empty;
  61
  62         //draw seconds hand
  63         //phi = -90+(s*(360/60));
  64         //int i;
  65         for(i=0;i<360;i+=28) {
  66                 double inc=0;
  67                 for(r=0;r<(size/2);r+=inc) {
  68                         x = round((size/2+polar2x(a+i,r))*zoom);
  69                         y = round(size/2+polar2y(a+i,r));
  70                         cifernik[x][y] = color_s;
  71                         a-=5;
  72                         inc+=0.009;
  73                 }
  74         }
  75
  76         //draw center dot
  77         cifernik[(size/2)*zoom][size/2] = color_center;
  78
  79         //cls when terminal size changes
  80         if(lines != llines || cols != lcols) {
  81                 cls();
  82                 llines=lines;
  83                 lcols=cols;
  84         }
  85
  86         //print to terminal
  87         printf("\033[0;0H");
  88         for(y=0;y<size;y++) {
  89                 for(r=0;r<=((cols-(size*zoom))/2);r++) putchar(' ');
  90                 for(x=0;x<((size*zoom)-(zoom-1));x++) {
  91                         putchar(cifernik[x][y]);
  92                 }
  93                 if(y!=(size-1)) putchar('\n');
  94         }
  95 }
  96
  97 int main(void) {
  98         int a = 0;
  99
 100         while(1) {
 101                         render_clock(a=(a+5)%360);
 102                         usleep(100000);
 103         }
 104 }