mirror of
https://github.com/deater/dos33fsprogs.git
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164 lines
3.3 KiB
C
164 lines
3.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <math.h>
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#include "gr-sim.h"
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// Based on BASIC program posted by FozzTexx, originally written in 1987
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//140 REM MS is max steps, CS is current step, X/Y/X1/Y1/X2/Y2 is rocket position
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//150 REM CL is Apple II hi-res color group
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static const int ysize=160,xsize=280,margin=24;
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static int color_group;
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static int max_steps;
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static double x_even_older,x_old=0,y_even_older,y_old=0,cs,peak;
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static double xpos,ypos,x_velocity,y_velocity;
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static double i,nn;
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void routine_370(void) {
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hplot(xpos+x_old+nn,ypos+y_old+nn); // NE
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hplot(xpos+x_old-nn,ypos+y_old-nn); // SW
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hplot(xpos+x_old+nn,ypos+y_old-nn); // SE
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hplot(xpos+x_old-nn,ypos+y_old+nn); // NW
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hplot(xpos+x_old,ypos+y_old+(nn*1.5)); // N
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hplot(xpos+x_old+(nn*1.5),ypos+y_old); // E
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hplot(xpos+x_old,ypos+y_old-(nn*1.5)); // S
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hplot(xpos+x_old-(nn*1.5),ypos+y_old); // W
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}
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int main(int argc, char **argv) {
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int ch;
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grsim_init();
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home();
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hgr();
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soft_switch(MIXCLR); // Full screen
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label_180:
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color_group=random()%2; // HGR color group (PG or BO)
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x_velocity=(random()%3)+1; // x velocity = 1..3
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y_velocity=-((random()%5)+3); // y velocity = -3..-7
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max_steps=(random()%25)+40; // 40..64
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xpos=(random()%(xsize-margin*2))+margin;
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// margin .. xsize-margin
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ypos=ysize; // start at ground
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peak=ypos; // peak starts at ground?
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/* Aim towards center of screen */
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if (xpos>xsize/2) x_velocity=-x_velocity;
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/* Draw rocket */
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for(cs=1;cs<=max_steps;cs++) {
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y_even_older=y_old;
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y_old=ypos;
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x_even_older=x_old;
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x_old=xpos;
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/* Move rocket */
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xpos=xpos+x_velocity;
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ypos=ypos+y_velocity;
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/* adjust Y velocity, slow it down */
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y_velocity=y_velocity+0.125;
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/* if we went higher, adjust peak */
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if (ypos<peak) peak=ypos;
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/* check if out of bounds and stop moving */
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if (xpos<=margin) {
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cs=max_steps; // too far left
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}
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if (xpos>=(xsize-margin)) {
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cs=max_steps; // too far right
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}
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if (ypos<=margin) {
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cs=max_steps; // too far up
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}
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// if falling downward
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if (y_velocity>0) {
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// if too close to ground, explode
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if (ypos>=ysize-margin) {
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cs=max_steps;
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}
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// if fallen a bit past peak, explode
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if (ypos>ysize-(ysize-peak)/2) {
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cs=max_steps;
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}
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}
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// if not done, draw rocket
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if (cs<max_steps) {
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hcolor_equals(color_group*4+3);
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hplot(x_old,y_old);
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hplot_to(xpos,ypos);
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}
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// erase with proper color black
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hcolor_equals(color_group*4);
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hplot(x_even_older,y_even_older);
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hplot_to(x_old,y_old);
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grsim_update();
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ch=grsim_input();
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if (ch=='q') exit(0);
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usleep(100000);
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}
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label_290:
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/* Draw explosion near x_old, y_old */
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x_old=floor(x_old);
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y_old=floor(y_old);
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xpos=(random()%20)-10; // x +/- 10
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ypos=(random()%20)-10; // y +/- 10
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hcolor_equals(color_group*4+3); // draw white (with fringes)
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hplot(xpos+x_old,ypos+y_old); // draw at center of explosion
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/* Spread the explosion */
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for(i=1;i<=9;i++) {
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/* Draw spreading dots in white */
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if (i<9) {
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nn=i;
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hcolor_equals(color_group*4+3);
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routine_370();
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}
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/* erase old */
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nn=i-1;
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hcolor_equals(color_group*4);
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routine_370();
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grsim_update();
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ch=grsim_input();
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if (ch=='q') break;
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usleep(100000);
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}
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/* randomly draw more explosions */
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if (random()%2) goto label_290;
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goto label_180;
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return 0;
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}
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