106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
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/**
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* ASCII explosion from squeamish ossifrage at:
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* https://codegolf.stackexchange.com/questions/24462/display-the-explosion-of-a-star-in-ascii-art/24554#24554
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*/
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#include "colors.h"
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#include <curses.h>
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#include <math.h>
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#include <stdlib.h>
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#define NUM_BLOBS 800
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#define PERSPECTIVE 50.0
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typedef struct {
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double x,y,z;
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} spaceblob_t;
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static double prng() {
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static long long s=1;
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s = s * 1488248101 + 981577151;
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return ((s % 65536) - 32768) / 32768.0;
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}
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void draw_explosion(int i, int midx, int midy) {
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static spaceblob_t blobs[NUM_BLOBS];
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int rows,cols;
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getmaxyx(stdscr,rows,cols);
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int maxx,minx,maxy,miny;
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minx = -midx;
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maxx = cols+minx-1;
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miny = -midy;
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maxy = rows+miny-1;
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if (i == 0) {
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/* Generate random blob coordinates */
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for (int i=0; i<NUM_BLOBS; i++) {
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double bx,by,bz,br;
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bx = prng();
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by = prng();
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bz = prng();
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br = sqrt(bx*bx + by*by + bz*bz);
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blobs[i].x = (bx / br) * (1.3 + 0.2 * prng());
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blobs[i].y = (0.5 * by / br) * (1.3 + 0.2 * prng());;
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blobs[i].z = (bz / br) * (1.3 + 0.2 * prng());;
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}
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/* Flash on the first frame */
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bkgd(COLOR_PAIR(WHITE_BG));
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erase();
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return;
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}
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bkgd(0);
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chtype line[cols+1];
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for (int y=miny; y<=maxy; y++) {
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int row = y+midy;
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for (int x=minx; x<=maxx; x++) {
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int col = x+midx;
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/* Show expanding star in next 7 frames */
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if (i<8) {
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double r = sqrt(x*x + 4*y*y);
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if (r < i*2)
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mvaddch(row,col,'@');
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continue;
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}
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/* Otherwise show blast wave */
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double r = sqrt(x*x + 4*y*y) * (0.5 + (prng()/3.0)*cos(16.*atan2(y*2.+0.01,x+0.01))*.3);
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int v = i - r - 7;
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if (v<0) {
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if (i<19) {
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int attr = 0;//color_ramp1[i-8];
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line[col] = "%@W#H=+~-:."[i-8] | attr;
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} else {
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line[col] = ' ';
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}
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} else if (v<20) {
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int attr = 0;//color_ramp2[v];
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line[col] = " .:!HIOMW#%$&@08O=+-"[v] | attr;
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} else {
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line[col] = ' ';
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}
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}
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if (i >= 8) {
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line[cols+1] = '\0';
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mvaddchstr(row,0,line);
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}
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}
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/* Add blobs with perspective effect */
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if (i>6) {
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int i0 = i-6;
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for (int j=0; j<NUM_BLOBS; j++) {
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double bx = blobs[j].x * i0;
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double by = blobs[j].y * i0;
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double bz = blobs[j].z * i0;
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if (bz<5-PERSPECTIVE || bz>PERSPECTIVE) continue;
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int x = midx + bx * PERSPECTIVE / (bz+PERSPECTIVE);
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int y = midy + by * PERSPECTIVE / (bz+PERSPECTIVE);
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if (x>=0 && x<cols && y>=0 && y<rows) {
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int row = y, col = x;
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mvaddch(row,col,(bz>40) ? '.' : (bz>-20) ? 'o' : '@');
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}
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}
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}
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}
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