shithub: 3dee

Download patch

ref: aeb153cdd6cb37dc1e9d61b22a92430a756ddeb5
parent: 55ceca8db396829cba474164545c6bcfcc45eea4
author: rodri <rgl@antares-labs.eu>
date: Sun May 12 16:34:03 EDT 2024 

began work on a solar system planetarium.


--- a/mdl/earth.mtl
+++ b/mdl/earth.mtl
@@ -19,6 +19,7 @@
 Ke 0.000000 0.000000 0.000000
 Ni 1.000000
 d 1.000000
+map_Kd earth_clouds.png
 illum 2
 
 newmtl Earth
@@ -29,4 +30,5 @@
 Ke 0.000000 0.000000 0.000000
 Ni 1.000000
 d 1.000000
+map_Kd earth_diffuse.png
 illum 2
binary files /dev/null b/mdl/jupiter_diffuse.png differ
binary files /dev/null b/mdl/luna_diffuse.png differ
binary files /dev/null b/mdl/mars_diffuse.png differ
binary files /dev/null b/mdl/mercury_diffuse.png differ
--- /dev/null
+++ b/mdl/planet.mtl
@@ -1,0 +1,43 @@
+newmtl Sol
+Kd 1.0 1.0 1.0
+map_Kd sol_diffuse.jpg
+
+newmtl Mercury
+Kd 1.0 1.0 1.0
+map_Kd mercury_diffuse.png
+
+newmtl Venus
+Kd 1.0 1.0 1.0
+map_Kd venus_diffuse.png
+
+newmtl Earth
+Kd 1.0 1.0 1.0
+map_Kd earth_diffuse.png
+
+newmtl Luna
+Kd 1.0 1.0 1.0
+map_Kd luna_diffuse.png
+
+newmtl Mars
+Kd 1.0 1.0 1.0
+map_Kd mars_diffuse.png
+
+newmtl Jupiter
+Kd 1.0 1.0 1.0
+map_Kd jupiter_diffuse.png
+
+newmtl Saturn
+Kd 1.0 1.0 1.0
+map_Kd saturn_diffuse.png
+
+newmtl Uranus
+Kd 0.8 0.1 0.1
+#map_Kd uranus_diffuse.png
+#
+newmtl Neptune
+Kd 0.1 0.8 0.1
+#map_Kd neptune_diffuse.png
+#
+newmtl Pluto
+Kd 0.1 0.1 0.8
+#map_Kd pluto_diffuse.png
--- /dev/null
+++ b/mdl/planet.obj
@@ -1,0 +1,1598 @@
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binary files /dev/null b/mdl/saturn_diffuse.png differ
binary files /dev/null b/mdl/sol_diffuse.jpg differ
binary files /dev/null b/mdl/venus_diffuse.png differ
--- a/mkfile
+++ b/mkfile
@@ -3,6 +3,7 @@
 BIN=$home/bin/$objtype
 TARG=\
 	vis\
+	solar\
 
 OFILES=\
 	alloc.$O\
--- /dev/null
+++ b/solar.c
@@ -1,0 +1,685 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <thread.h>
+#include <draw.h>
+#include <memdraw.h>
+#include <mouse.h>
+#include <keyboard.h>
+#include <geometry.h>
+#include "libobj/obj.h"
+#include "libgraphics/graphics.h"
+#include "fns.h"
+
+enum {
+	K↑,
+	K↓,
+	K←,
+	K→,
+	Krise,
+	Kfall,
+	KR↑,
+	KR↓,
+	KR←,
+	KR→,
+	KR↺,
+	KR↻,
+	Kzoomin,
+	Kzoomout,
+	Khud,
+	Ke
+};
+
+enum {
+	Sfov,
+	Scampos,
+	Scambx, Scamby, Scambz,
+	Sfps,
+	Sframes,
+	Se
+};
+
+enum {
+	Cmdwinht = 50,
+	Cmdmargin = 10,
+	Cmdpadding = 3,
+
+	Cmdlookat = 0,
+	Cmdgoto,
+};
+
+typedef struct Planet Planet;
+typedef struct Camcfg Camcfg;
+typedef struct HReq HReq;
+typedef struct Cmdbut Cmdbut;
+typedef struct Cmdbox Cmdbox;
+
+struct Planet
+{
+	int id;		/* Horizons API ID */
+	char *name;
+	double scale;
+	Entity *body;
+	Material *mtl;
+};
+
+struct Camcfg
+{
+	Point3 p, lookat, up;
+	double fov, clipn, clipf;
+	int ptype;
+};
+
+struct HReq
+{
+	int pfd[2];
+	int pid;	/* planet id */
+	char *t0, *t1;	/* start and end times */
+};
+
+struct Cmdbut
+{
+	char *label;
+	Rectangle r;
+	void (*handler)(Cmdbut*, Mousectl*);
+};
+
+struct Cmdbox
+{
+	Rectangle r;
+	Cmdbut *cmds;
+	ulong ncmds;
+};
+
+Rune keys[Ke] = {
+ [K↑]		= Kup,
+ [K↓]		= Kdown,
+ [K←]		= Kleft,
+ [K→]		= Kright,
+ [Krise]	= Kpgup,
+ [Kfall]	= Kpgdown,
+ [KR↑]		= 'w',
+ [KR↓]		= 's',
+ [KR←]		= 'a',
+ [KR→]		= 'd',
+ [KR↺]		= 'q',
+ [KR↻]		= 'e',
+ [Kzoomin]	= 'z',
+ [Kzoomout]	= 'x',
+ [Khud]		= 'h',
+};
+Planet planets[] = {
+	{ .id = 10,	.name = "Sol",		.scale = 100 },
+	{ .id = 1,	.name = "Mercury",	.scale = 0.333333 },
+	{ .id = 2,	.name = "Venus",	.scale = 0.8 },
+	{ .id = 399,	.name = "Earth",	.scale = 1 },
+	{ .id = 301,	.name = "Luna",		.scale = 0.25 },
+	{ .id = 4,	.name = "Mars",		.scale = 0.5 },
+	{ .id = 5,	.name = "Jupiter",	.scale = 11 },
+	{ .id = 6,	.name = "Saturn",	.scale = 9 },
+	{ .id = 7,	.name = "Uranus",	.scale = 4 },
+	{ .id = 8,	.name = "Neptune",	.scale = 3.666666 },
+	{ .id = 9,	.name = "Pluto",	.scale = 0.166666 },
+};
+char stats[Se][256];
+Rectangle viewr, cmdr;
+Cmdbox cmdbox;
+Image *screenb;
+Mousectl *mctl;
+Keyboardctl *kctl;
+Channel *drawc;
+int kdown;
+Model *model;
+Scene *scene;
+double θ, ω = 0;
+
+Camera camera;
+Camcfg cameracfg = {
+	2,0,4,1,
+	0,0,0,1,
+	0,1,0,0,
+	80*DEG, 0.01, 1e12, PERSPECTIVE
+};
+Point3 center = {0,0,0,1};
+
+static int doprof;
+static int showhud;
+
+static int
+min(int a, int b)
+{
+	return a < b? a: b;
+}
+
+static int
+max(int a, int b)
+{
+	return a > b? a: b;
+}
+
+static void
+sailor(void *arg)
+{
+	char buf[128], pidstr[8];
+	HReq *r;
+
+	r = arg;
+
+	close(r->pfd[0]);
+	dup(r->pfd[1], 1);
+	close(r->pfd[1]);
+
+	getwd(buf, sizeof(buf)-1);
+	snprint(buf+strlen(buf), sizeof(buf)-strlen(buf), "/tools/horizonget");
+	snprint(pidstr, sizeof pidstr, "%d", r->pid);
+
+	execl(buf, "horizonget", pidstr, r->t0, r->t1, nil);
+	sysfatal("execl: %r");
+}
+
+static char *
+getplanetstate(int id, char *t0, char *t1)
+{
+	Biobuf *bin;
+	char *line, *lastline;
+	HReq r;
+
+	r.pid = id;
+	r.t0 = t0;
+	r.t1 = t1;
+	lastline = nil;
+
+	if(pipe(r.pfd) < 0)
+		sysfatal("pipe: %r");
+	switch(fork()){
+	case -1:
+		sysfatal("fork: %r");
+	case 0:
+		sailor(&r);
+	default:
+		close(r.pfd[1]);
+		bin = Bfdopen(r.pfd[0], OREAD);
+		if(bin == nil)
+			sysfatal("Bfdopen: %r");
+		while((line = Brdline(bin, '\n')) != nil){
+			line[Blinelen(bin)-1] = 0;
+			lastline = line;
+		}
+		if(lastline != nil)
+			lastline = strdup(lastline);
+		Bterm(bin);
+		close(r.pfd[0]);
+	}
+
+	return lastline;
+}
+
+static Planet *
+getplanet(Entity *e)
+{
+	int i;
+
+	for(i = 0; i < nelem(planets); i++)
+		if(e == planets[i].body)
+			return &planets[i];
+	return nil;
+}
+
+Point3
+identvshader(VSparams *sp)
+{
+	Planet *p;
+	Point3 pos;
+
+	p = getplanet(sp->su->entity);
+	assert(p != nil);
+
+	Matrix3 S = {
+		p->scale, 0, 0, 0,
+		0, p->scale, 0, 0,
+		0, 0, p->scale, 0,
+		0, 0, 0, 1,
+	};
+	pos = xform3(sp->v->p, S);
+
+	sp->v->mtl = p->mtl;
+	sp->v->c = p->mtl->diffuse;
+	return world2clip(&camera, model2world(sp->su->entity, pos));
+}
+
+Color
+identshader(FSparams *sp)
+{
+	Color tc, c;
+
+	if(sp->v.mtl != nil && sp->v.mtl->diffusemap != nil && sp->v.uv.w != 0)
+		tc = texture(sp->v.mtl->diffusemap, sp->v.uv, neartexsampler);
+	else if(sp->su->entity->mdl->tex != nil && sp->v.uv.w != 0)
+		tc = texture(sp->su->entity->mdl->tex, sp->v.uv, neartexsampler);
+	else
+		tc = Pt3(1,1,1,1);
+
+	c.a = 1;
+	c.b = fclamp(sp->v.c.b*tc.b, 0, 1);
+	c.g = fclamp(sp->v.c.g*tc.g, 0, 1);
+	c.r = fclamp(sp->v.c.r*tc.r, 0, 1);
+
+	return c;
+}
+
+Shadertab shader = { "ident", identvshader, identshader };
+
+void
+zoomin(void)
+{
+	camera.fov = fclamp(camera.fov - 1*DEG, 1*DEG, 180*DEG);
+	reloadcamera(&camera);
+}
+
+void
+zoomout(void)
+{
+	camera.fov = fclamp(camera.fov + 1*DEG, 1*DEG, 180*DEG);
+	reloadcamera(&camera);
+}
+
+void
+drawstats(void)
+{
+	int i;
+
+	snprint(stats[Sfov], sizeof(stats[Sfov]), "FOV %g°", camera.fov/DEG);
+	snprint(stats[Scampos], sizeof(stats[Scampos]), "%V", camera.p);
+	snprint(stats[Scambx], sizeof(stats[Scambx]), "bx %V", camera.bx);
+	snprint(stats[Scamby], sizeof(stats[Scamby]), "by %V", camera.by);
+	snprint(stats[Scambz], sizeof(stats[Scambz]), "bz %V", camera.bz);
+	snprint(stats[Sfps], sizeof(stats[Sfps]), "FPS %.0f/%.0f/%.0f/%.0f", !camera.stats.max? 0: 1e9/camera.stats.max, !camera.stats.avg? 0: 1e9/camera.stats.avg, !camera.stats.min? 0: 1e9/camera.stats.min, !camera.stats.v? 0: 1e9/camera.stats.v);
+	snprint(stats[Sframes], sizeof(stats[Sframes]), "frame %llud", camera.stats.nframes);
+	for(i = 0; i < Se; i++)
+		stringbg(screen, addpt(screen->r.min, Pt(10,10 + i*font->height)), display->black, ZP, font, stats[i], display->white, ZP);
+}
+
+void
+redraw(void)
+{
+	int i;
+
+	lockdisplay(display);
+	camera.vp->draw(camera.vp, screenb);
+	draw(screen, rectaddpt(viewr, screen->r.min), display->black, nil, ZP);
+	draw(screen, rectaddpt(viewr, screen->r.min), screenb, nil, ZP);
+	draw(screen, rectaddpt(cmdbox.r, screen->r.min), display->white, nil, ZP);
+	for(i = 0; i < cmdbox.ncmds; i++){
+		border(screen, rectaddpt(cmdbox.cmds[i].r, screen->r.min), 1, display->black, ZP);
+		string(screen, addpt(screen->r.min, addpt(cmdbox.cmds[i].r.min, Pt(Cmdpadding,Cmdpadding))), display->black, ZP, font, cmdbox.cmds[i].label);
+	}
+	if(showhud)
+		drawstats();
+	flushimage(display, 1);
+	unlockdisplay(display);
+}
+
+void
+drawproc(void *)
+{
+	uvlong t0, Δt;
+
+	threadsetname("drawproc");
+
+	t0 = nsec();
+	for(;;){
+		shootcamera(&camera, &shader);
+		if(doprof)
+		fprint(2, "R %llud %llud\nE %llud %llud\nT %llud %llud\nr %llud %llud\n\n",
+			camera.times.R[camera.times.cur-1].t0, camera.times.R[camera.times.cur-1].t1,
+			camera.times.E[camera.times.cur-1].t0, camera.times.E[camera.times.cur-1].t1,
+			camera.times.Tn[camera.times.cur-1].t0, camera.times.Tn[camera.times.cur-1].t1,
+			camera.times.Rn[camera.times.cur-1].t0, camera.times.Rn[camera.times.cur-1].t1);
+		Δt = nsec() - t0;
+		if(Δt > HZ2MS(60)*1000000ULL){
+			nbsend(drawc, nil);
+			t0 += Δt;
+		}
+	}
+}
+
+static char *
+genplanetmenu(int idx)
+{
+	if(idx < nelem(planets))
+		return planets[idx].name;
+	return nil;
+}
+
+void
+lookat_cmd(Cmdbut *, Mousectl *mc)
+{
+	static Menu menu = { .gen = genplanetmenu };
+	Planet *p;
+	int idx;
+
+	idx = menuhit(1, mc, &menu, _screen);
+	if(idx < 0)
+		return;
+	p = &planets[idx];
+	placecamera(&camera, camera.p, p->body->p, cameracfg.up);
+	nbsend(drawc, nil);
+}
+
+void
+goto_cmd(Cmdbut *, Mousectl *mc)
+{
+	static Menu menu = { .gen = genplanetmenu };
+	Planet *p;
+	int idx;
+
+	idx = menuhit(1, mc, &menu, _screen);
+	if(idx < 0)
+		return;
+	p = &planets[idx];
+	placecamera(&camera, addpt3(p->body->p, Vec3(0,0,10)), p->body->p, cameracfg.up);
+	nbsend(drawc, nil);
+}
+
+Cmdbut cmds[] = {
+	{ .label = "look at", .handler = lookat_cmd },
+	{ .label = "go to", .handler = goto_cmd },
+};
+
+void
+lmb(void)
+{
+	Cmdbut *cmd;
+	int i;
+
+	cmd = nil;
+	for(i = 0; i < cmdbox.ncmds; i++)
+		if(ptinrect(subpt(mctl->xy, screen->r.min), cmdbox.cmds[i].r))
+			cmd = &cmdbox.cmds[i];
+
+	if(cmd == nil)
+		return;
+	cmd->handler(cmd, mctl);
+}
+
+void
+mmb(void)
+{
+	enum {
+		QUIT,
+	};
+	static char *items[] = {
+	 [QUIT]	"quit",
+		nil,
+	};
+	static Menu menu = { .item = items };
+
+	switch(menuhit(2, mctl, &menu, _screen)){
+	case QUIT:
+		threadexitsall(nil);
+	}
+	nbsend(drawc, nil);
+}
+
+void
+mouse(void)
+{
+	static Mouse om;
+
+	if((om.buttons ^ mctl->buttons) == 0)
+		return;
+	if((mctl->buttons & 1) != 0)
+		lmb();
+	if((mctl->buttons & 2) != 0)
+		mmb();
+	if((mctl->buttons & 8) != 0)
+		zoomin();
+	if((mctl->buttons & 16) != 0)
+		zoomout();
+
+	om = mctl->Mouse;
+}
+
+void
+kbdproc(void *)
+{
+	Rune r, *a;
+	char buf[128], *s;
+	int fd, n;
+
+	threadsetname("kbdproc");
+
+	if((fd = open("/dev/kbd", OREAD)) < 0)
+		sysfatal("kbdproc: %r");
+	memset(buf, 0, sizeof buf);
+
+	for(;;){
+		if(buf[0] != 0){
+			n = strlen(buf)+1;
+			memmove(buf, buf+n, sizeof(buf)-n);
+		}
+		if(buf[0] == 0){
+			if((n = read(fd, buf, sizeof(buf)-1)) <= 0)
+				break;
+			buf[n-1] = 0;
+			buf[n] = 0;
+		}
+		if(buf[0] == 'c'){
+			chartorune(&r, buf+1);
+			if(r == Kdel){
+				close(fd);
+				threadexitsall(nil);
+			}else
+				nbsend(kctl->c, &r);
+		}
+		if(buf[0] != 'k' && buf[0] != 'K')
+			continue;
+		s = buf+1;
+		kdown = 0;
+		while(*s){
+			s += chartorune(&r, s);
+			for(a = keys; a < keys+Ke; a++)
+				if(r == *a){
+					kdown |= 1 << a-keys;
+					break;
+				}
+		}
+	}
+}
+
+void
+keyproc(void *c)
+{
+	threadsetname("keyproc");
+
+	for(;;){
+		nbsend(c, nil);
+		sleep(HZ2MS(100));	/* key poll rate */
+	}
+}
+
+void
+handlekeys(void)
+{
+	static int okdown;
+
+	if(kdown & 1<<K↑)
+		placecamera(&camera, subpt3(camera.p, mulpt3(camera.bz, 0.1)), camera.bz, camera.by);
+	if(kdown & 1<<K↓)
+		placecamera(&camera, addpt3(camera.p, mulpt3(camera.bz, 0.1)), camera.bz, camera.by);
+	if(kdown & 1<<K←)
+		placecamera(&camera, subpt3(camera.p, mulpt3(camera.bx, 0.1)), camera.bz, camera.by);
+	if(kdown & 1<<K→)
+		placecamera(&camera, addpt3(camera.p, mulpt3(camera.bx, 0.1)), camera.bz, camera.by);
+	if(kdown & 1<<Krise)
+		placecamera(&camera, addpt3(camera.p, mulpt3(camera.by, 0.1)), camera.bz, camera.by);
+	if(kdown & 1<<Kfall)
+		placecamera(&camera, subpt3(camera.p, mulpt3(camera.by, 0.1)), camera.bz, camera.by);
+	if(kdown & 1<<KR↑)
+		aimcamera(&camera, qrotate(camera.bz, camera.bx, 1*DEG));
+	if(kdown & 1<<KR↓)
+		aimcamera(&camera, qrotate(camera.bz, camera.bx, -1*DEG));
+	if(kdown & 1<<KR←)
+		aimcamera(&camera, qrotate(camera.bz, camera.by, 1*DEG));
+	if(kdown & 1<<KR→)
+		aimcamera(&camera, qrotate(camera.bz, camera.by, -1*DEG));
+	if(kdown & 1<<KR↺)
+		placecamera(&camera, camera.p, camera.bz, qrotate(camera.by, camera.bz, 1*DEG));
+	if(kdown & 1<<KR↻)
+		placecamera(&camera, camera.p, camera.bz, qrotate(camera.by, camera.bz, -1*DEG));
+	if(kdown & 1<<Kzoomin)
+		zoomin();
+	if(kdown & 1<<Kzoomout)
+		zoomout();
+
+	if((okdown & 1<<Khud) == 0 && (kdown & 1<<Khud) != 0)
+		showhud ^= 1;
+
+	okdown = kdown;
+}
+
+void
+resize(void)
+{
+	lockdisplay(display);
+	if(getwindow(display, Refnone) < 0)
+		fprint(2, "can't reattach to window\n");
+	unlockdisplay(display);
+	nbsend(drawc, nil);
+}
+
+static void
+confproc(void)
+{
+	char buf[64];
+	int fd;
+
+	snprint(buf, sizeof buf, "/proc/%d/ctl", getpid());
+	fd = open(buf, OWRITE);
+	if(fd < 0)
+		sysfatal("open: %r");
+
+	if(doprof)
+		fprint(fd, "profile\n");
+	close(fd);
+}
+
+void
+usage(void)
+{
+	fprint(2, "usage: %s\n", argv0);
+	exits("usage");
+}
+
+void
+threadmain(int argc, char *argv[])
+{
+	Viewport *v;
+	Renderer *rctl;
+	Channel *keyc;
+	Entity *subject;
+	OBJ *obj;
+	Point lblsiz;
+	char *s, *p;
+	int i, j;
+
+	GEOMfmtinstall();
+	ARGBEGIN{
+	case 'p': doprof++; break;
+	default: usage();
+	}ARGEND;
+	if(argc != 0)
+		usage();
+
+	confproc();
+
+	if((obj = objparse("mdl/planet.obj")) == nil)
+		sysfatal("objparse: %r");
+	model = newmodel();
+	loadobjmodel(model, obj);
+	objfree(obj);
+	scene = newscene(nil);
+	fprint(2, "loading planet states...\n");
+	for(i = 0; i < nelem(planets); i++){
+		subject = newentity(model);
+//		subject->p.x = i*2e3;
+		scene->addent(scene, subject);
+		planets[i].body = subject;
+		for(j = 0; j < model->nmaterials; j++)
+			if(strcmp(planets[i].name, model->materials[j].name) == 0)
+				planets[i].mtl = &model->materials[j];
+		if(i == 0){
+			subject->p = Pt3(0,0,0,1);
+			continue;
+		}
+		s = getplanetstate(planets[i].id, nil, nil);
+		if(s == nil)
+			sysfatal("couldn't load planet: %s", planets[i].name);
+		p = strchr(s, '=');
+		subject->p.x = strtod(++p, nil);
+		p = strchr(p, '=');
+		subject->p.y = strtod(++p, nil);
+		p = strchr(p, '=');
+		subject->p.z = strtod(++p, nil);
+		subject->p.w = 1;
+		subject->p = divpt3(subject->p, 1e5);
+		free(s);
+		fprint(2, "%s ready\n", planets[i].name);
+	}
+
+	if(memimageinit() != 0)
+		sysfatal("memimageinit: %r");
+	if((rctl = initgraphics()) == nil)
+		sysfatal("initgraphics: %r");
+	if(initdraw(nil, nil, "solar") < 0)
+		sysfatal("initdraw: %r");
+	if((mctl = initmouse(nil, screen)) == nil)
+		sysfatal("initmouse: %r");
+
+	viewr = rectsubpt(Rpt(screen->r.min, subpt(screen->r.max, Pt(0,Cmdwinht))), screen->r.min);
+	cmdbox.r = Rect(viewr.min.x, viewr.max.y, Dx(viewr), Dy(screen->r));
+	cmdbox.cmds = cmds;
+	cmdbox.ncmds = nelem(cmds);
+	for(i = 0; i < nelem(cmds); i++){
+		lblsiz = stringsize(font, cmds[i].label);
+		cmds[i].r = Rect(0,0,Cmdpadding+lblsiz.x+Cmdpadding,Cmdpadding+lblsiz.y+Cmdpadding);
+		if(i == 0)
+			cmds[i].r = rectaddpt(cmds[i].r, addpt(cmdbox.r.min, Pt(Cmdmargin,Cmdmargin)));
+		else
+			cmds[i].r = rectaddpt(cmds[i].r, Pt(cmds[i-1].r.max.x+Cmdmargin,cmds[i-1].r.min.y));
+	}
+	screenb = eallocimage(display, viewr, RGBA32, 0, DNofill);
+	v = mkviewport(screenb->r);
+	placecamera(&camera, cameracfg.p, cameracfg.lookat, cameracfg.up);
+	configcamera(&camera, v, cameracfg.fov, cameracfg.clipn, cameracfg.clipf, cameracfg.ptype);
+	camera.s = scene;
+	camera.rctl = rctl;
+
+	kctl = emalloc(sizeof *kctl);
+	kctl->c = chancreate(sizeof(Rune), 16);
+	keyc = chancreate(sizeof(void*), 1);
+	drawc = chancreate(sizeof(void*), 1);
+	display->locking = 1;
+	unlockdisplay(display);
+
+	proccreate(kbdproc, nil, mainstacksize);
+	proccreate(keyproc, keyc, mainstacksize);
+	proccreate(drawproc, nil, mainstacksize);
+
+	for(;;){
+		enum {MOUSE, RESIZE, KEY, DRAW};
+		Alt a[] = {
+			{mctl->c, &mctl->Mouse, CHANRCV},
+			{mctl->resizec, nil, CHANRCV},
+			{keyc, nil, CHANRCV},
+			{drawc, nil, CHANRCV},
+			{nil, nil, CHANEND}
+		};
+		switch(alt(a)){
+		case MOUSE: mouse(); break;
+		case RESIZE: resize(); break;
+		case KEY: handlekeys(); break;
+		case DRAW: redraw(); break;
+		}
+	}
+}
--- /dev/null
+++ b/tools/horizon.api.get
@@ -1,0 +1,29 @@
+#!/bin/rc
+#
+# NASA JPL Horizons API
+# https://ssd.jpl.nasa.gov/horizons/
+#
+rfork ne
+center=()
+target=()
+t0=()
+t1=()
+step=()
+flagfmt=''
+args='center target t0 t1 step'
+
+fn usage {
+	aux/usage
+	exit usage
+}
+
+if(! ifs=() eval `{aux/getflags $*} || ! ~ $#* 5)
+	usage
+
+center=$1
+target=$2
+t0=$3
+t1=$4
+step=$5
+
+hget 'https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='''$target'''&OBJ_DATA=''YES''&MAKE_EPHEM=''YES''&EPHEM_TYPE=''VECTORS''&CENTER='''$center'''&START_TIME='''$t0'''&STOP_TIME='''$t1'''&STEP_SIZE='''$step'''&VEC_TABLE=''1'''
--- /dev/null
+++ b/tools/horizon.getdata.awk
@@ -1,0 +1,3 @@
+#!/bin/awk -f
+BEGIN{ doprint=0 }
+{ if($1 == "$$EOE") doprint=0; if(doprint) print; if($1 == "$$SOE") doprint=1; }
--- /dev/null
+++ b/tools/horizonget
@@ -1,0 +1,31 @@
+#!/bin/rc
+rfork ne
+cwd=`{basename -d $0}
+center='@sun'
+target=()
+t0=`{date -f 'YYYY-MM-DD' `{echo `{date -n} - 86400 | bc}}
+t1=`{date -f 'YYYY-MM-DD'}
+step='1 d'
+flagfmt=''
+args='target [t0 t1]'
+
+fn usage {
+	aux/usage
+	exit usage
+}
+
+if(! ifs=() eval `{aux/getflags $*})
+	usage
+
+switch($#*){
+case 1
+	target=$1
+case 3
+	target=$1
+	t0=$2
+	t1=$3
+case *
+	usage
+}
+
+$cwd^/horizon.api.get $center $target $t0 $t1 $step | $cwd^/horizon.getdata.awk | tr A-Z a-z