Apple-2-SW/dos33fsprogs
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ksp: add time acceleration to the C version

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This commit is contained in:
Vince Weaver 2016-05-30 11:08:36 -04:00
parent abd6d93194
commit e519437863
1 changed files with 18 additions and 6 deletions
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24
ksp/c/ksp_launch.c
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@ -88,6 +88,7 @@ int main(int argc, char **argv) {
double v0_x,v0_y;
double time=0.0; /* s */
double deltat=1.0;
int stage=2;
@ -181,17 +182,18 @@ int main(int argc, char **argv) {
rocket_acceleration_x+=gravity_x;
/* v=v0+at */
v0_x=rocket_velocity_x;
v0_y=rocket_velocity_y;
rocket_velocity_y=v0_y+rocket_acceleration_y*1.0;
rocket_velocity_x=v0_x+rocket_acceleration_x*1.0;
rocket_velocity_y=v0_y+rocket_acceleration_y*deltat;
rocket_velocity_x=v0_x+rocket_acceleration_x*deltat;
rocket_velocity=vector_magnitude(rocket_velocity_x,rocket_velocity_y),
/* deltaX=1/2 (v+v0)t */
/* could also use deltax=v0t+(1/2)*a*t*t */
rocket_y=rocket_y+0.5*(v0_y+rocket_velocity_y)*1.0;
rocket_x=rocket_x+0.5*(v0_x+rocket_velocity_x)*1.0;
rocket_y=rocket_y+0.5*(v0_y+rocket_velocity_y)*deltat;
rocket_x=rocket_x+0.5*(v0_x+rocket_velocity_x)*deltat;
rocket_altitude=vector_magnitude(rocket_x,rocket_y);
@ -273,7 +275,8 @@ int main(int argc, char **argv) {
if (angle<0.0) angle+=360.0;
}
if (input=='z') {
thrusting=1;
/* no thrusting while fast-forwarding */
if (deltat<1.5) thrusting=1;
}
if (input=='x') {
thrusting=0;
@ -282,7 +285,16 @@ int main(int argc, char **argv) {
break;
}
time+=1.0;
if (input=='>') {
/* no fast-forwarding while thrusting */
if (!thrusting) deltat+=1.0;
}
if (input=='<') {
deltat-=1.0;
if (deltat<1.0) deltat=1.0;
}
time+=deltat;
if (log_step==0) {
if (logfile) {