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author | rodri <rgl@antares-labs.eu> | 2020-02-20 22:02:08 +0000 |
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committer | rodri <rgl@antares-labs.eu> | 2020-02-20 22:02:08 +0000 |
commit | 168a16b70a928ed64061bdac7fc9d52235c3f9fc (patch) | |
tree | 50ad23804ba927af802d42f2b7a450200fcbf2a7 /main.c | |
download | ballistics-168a16b70a928ed64061bdac7fc9d52235c3f9fc.tar.gz ballistics-168a16b70a928ed64061bdac7fc9d52235c3f9fc.tar.bz2 ballistics-168a16b70a928ed64061bdac7fc9d52235c3f9fc.zip |
git release.
Diffstat (limited to 'main.c')
-rw-r--r-- | main.c | 244 |
1 files changed, 244 insertions, 0 deletions
@@ -0,0 +1,244 @@ +#include <u.h> +#include <libc.h> +#include <thread.h> +#include <draw.h> +#include <mouse.h> +#include <keyboard.h> +#include "dat.h" +#include "fns.h" + +Mousectl *mc; +Keyboardctl *kc; +Channel *scrsync; +Point orig; +Vector basis; +Projectile ball; +double t0, Δt; +double v0; +Vector target; + +char stats[SLEN][64]; +Image *statc; + +void * +emalloc(ulong n) +{ + void *p; + + p = malloc(n); + if(p == nil) + sysfatal("malloc: %r"); + memset(p, 0, n); + setmalloctag(p, getcallerpc(&n)); + return p; +} + +Point +toscreen(Vector p) +{ + return addpt(orig, Pt(p.x*basis.x, p.y*basis.y)); +} + +Vector +fromscreen(Point p) +{ + return Vec((p.x-screen->r.min.x)*M2PIX, (screen->r.max.y-p.y)*M2PIX, 1); +} + +void +drawstats(void) +{ + int i; + + snprint(stats[Svel], sizeof(stats[Svel]), "v: %gm/s", hypot(ball.v.x, ball.v.y)); + snprint(stats[Sdeltax], sizeof(stats[Sdeltax]), "Δx: %gm", target.x-ball.p.x); + for(i = 0; i < nelem(stats); i++) + stringn(screen, addpt(screen->r.min, Pt(10, font->height*i+1)), statc, ZP, font, stats[i], sizeof(stats[i])); +} + +void +redraw(void) +{ + lockdisplay(display); + draw(screen, screen->r, display->black, nil, ZP); + fillellipse(screen, toscreen(ball.p), 2, 2, display->white, ZP); + line(screen, toscreen(Vec(ball.p.x, 0, 1)), toscreen(target), 0, 0, 1, statc, ZP); + drawstats(); + flushimage(display, 1); + unlockdisplay(display); +} + +void +mmb(void) +{ + enum { + SETV0, + }; + static char *items[] = { + [SETV0] "set v0", + nil + }; + static Menu menu = { .item = items }; + char buf[32]; + + snprint(buf, sizeof(buf), "%g", v0); + switch(menuhit(2, mc, &menu, nil)){ + case SETV0: + enter("v0(m/s):", buf, sizeof(buf), mc, kc, nil); + v0 = strtod(buf, 0); + break; + } +} + +void +rmb(void) +{ + enum { + RST, + QUIT, + }; + static char *items[] = { + [RST] "reset", + [QUIT] "quit", + nil, + }; + static Menu menu = { .item = items }; + + switch(menuhit(3, mc, &menu, nil)){ + case RST: + ball.p = Vec((2+1)*M2PIX, (2+1)*M2PIX, 1); + ball.v = Vec(0, 0, 1); + break; + case QUIT: + threadexitsall(nil); + } +} + +void +mouse(void) +{ + Vector p; + double θ, dist, eta; + + if(ball.p.y <= (2+1)*M2PIX){ + p = subvec(fromscreen(mc->xy), ball.p); + θ = atan2(p.y, p.x); + snprint(stats[Stheta], sizeof(stats[Stheta]), "θ: %g°", θ*180/PI); + dist = v0*v0*sin(2*θ)/Eg; + target = Vec(ball.p.x+dist, 0, 1); + eta = 2*v0*sin(θ)/Eg; + snprint(stats[Seta], sizeof(stats[Seta]), "eta: %gs", eta); + if((mc->buttons & 1) != 0) + ball.v = Vec(v0*cos(θ), v0*sin(θ), 1); + } + if((mc->buttons & 2) != 0) + mmb(); + if((mc->buttons & 4) != 0) + rmb(); +} + +void +key(Rune r) +{ + switch(r){ + case Kdel: + case 'q': + threadexitsall(nil); + } +} + +void +resized(void) +{ + lockdisplay(display); + if(getwindow(display, Refnone) < 0) + fprint(2, "can't reattach to window\n"); + orig = Pt(screen->r.min.x, screen->r.max.y); + unlockdisplay(display); + redraw(); +} + +void +scrsyncproc(void *) +{ + for(;;){ + send(scrsync, nil); + sleep(SEC/FPS); + } +} + +#pragma varargck type "V" Vector; +int +Vfmt(Fmt *f) +{ + Vector v; + + v = va_arg(f->args, Vector); + return fmtprint(f, "(%g %g)", v.x, v.y); +} + +void +usage(void) +{ + fprint(2, "usage: %s\n", argv0); + exits("usage"); +} + +void +threadmain(int argc, char *argv[]) +{ + Rune r; + + fmtinstall('V', Vfmt); + ARGBEGIN{ + default: usage(); + }ARGEND; + + if(initdraw(nil, nil, "ballistics") < 0) + sysfatal("initdraw: %r"); + mc = initmouse(nil, screen); + if(mc == nil) + sysfatal("initmouse: %r"); + kc = initkeyboard(nil); + if(kc == nil) + sysfatal("initkeyboard: %r"); + statc = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, DYellow); + if(statc == nil) + sysfatal("allocimage: %r"); + orig = Pt(screen->r.min.x, screen->r.max.y); + basis = Vec(PIX2M, -PIX2M, 1); + ball.p = Vec((2+1)*M2PIX, (2+1)*M2PIX, 1); + ball.v = Vec(0, 0, 1); + ball.mass = 106000; + v0 = 1640; /* Paris Gun's specs */ + scrsync = chancreate(1, 0); + display->locking = 1; + unlockdisplay(display); + proccreate(scrsyncproc, 0, STACK); + t0 = nsec(); + + for(;;){ + Alt a[] = { + {mc->c, &mc->Mouse, CHANRCV}, + {mc->resizec, nil, CHANRCV}, + {kc->c, &r, CHANRCV}, + {scrsync, nil, CHANRCV}, + {nil, nil, CHANEND} + }; + switch(alt(a)){ + case 0: mouse(); break; + case 1: resized(); break; + case 2: key(r); break; + case 3: redraw(); break; + } + Δt = (nsec()-t0)/1e9; + ball.v = addvec(ball.v, mulvec(Vec(0, -Eg, 1), Δt)); + ball.p = addvec(ball.p, mulvec(ball.v, Δt)); + snprint(stats[Spos], sizeof(stats[Spos]), "p: %V", ball.p); + if(ball.p.y <= (2+1)*M2PIX){ + ball.p.y = (2+1)*M2PIX; + ball.v = Vec(0, 0, 1); + } + t0 += Δt*1e9; + } +} |