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hyperrogue/binary-tiling.cpp

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namespace hr {
namespace binary {
#if CAP_BT
enum bindir {
bd_right = 0,
bd_up_right = 1,
bd_up = 2,
bd_up_left = 3,
bd_left = 4,
bd_down = 5, /* for cells of degree 6 */
bd_down_left = 5, /* for cells of degree 7 */
bd_down_right = 6 /* for cells of degree 7 */
};
int type_of(heptagon *h) {
return h->c7->type;
}
// 0 - central, -1 - left, +1 - right
int mapside(heptagon *h) {
return h->zebraval;
}
#if DEBUG_BINARY_TILING
map<heptagon*, long long> xcode;
map<long long, heptagon*> rxcode;
long long expected_xcode(heptagon *h, int d) {
auto r =xcode[h];
if(d == 0) return r + 1;
if(d == 1) return 2*r + 1;
if(d == 2) return 2*r;
if(d == 3) return 2*r - 1;
if(d == 4) return r-1;
if(d == 5 && type_of(h) == 6) return r / 2;
if(d == 5 && type_of(h) == 7) return (r-1) / 2;
if(d == 6 && type_of(h) == 7) return (r+1) / 2;
breakhere();
}
#endif
void breakhere() {
exit(1);
}
heptagon *path(heptagon *h, int d, int d1, std::initializer_list<int> p) {
static int rec = 0;
rec++; if(rec>100) exit(1);
// printf("{generating path from %p (%d/%d) dir %d:", h, type_of(h), mapside(h), d);
heptagon *h1 = h;
for(int d0: p) {
// printf(" [%d]", d0);
h1 = hr::createStep(h1, d0);
// printf(" %p", h1);
}
#if DEBUG_BINARY_TILING
if(xcode[h1] != expected_xcode(h, d)) {
printf("expected_xcode mismatch\n");
breakhere();
}
#endif
// printf("}\n");
if(h->move(d) && h->move(d) != h1) {
printf("already connected to something else (1)\n");
breakhere();
}
if(h1->move(d1) && h1->move(d1) != h) {
printf("already connected to something else (2)\n");
breakhere();
}
h->c.connect(d, h1, d1, false);
rec--;
return h1;
}
heptagon *build(heptagon *parent, int d, int d1, int t, int side, int delta) {
auto h = buildHeptagon1(tailored_alloc<heptagon> (t), parent, d, hsOrigin, d1);
h->distance = parent->distance + delta;
h->c7 = newCell(t, h);
h->cdata = NULL;
h->zebraval = side;
#if DEBUG_BINARY_TILING
xcode[h] = expected_xcode(parent, d);
if(rxcode.count(xcode[h])) {
printf("xcode clash\n");
breakhere();
}
rxcode[xcode[h]] = h;
#endif
return h;
}
#if MAXDIM==4
heptagon *build3(heptagon *parent, int d, int d1, int delta) {
int side = 0;
if(d < 4) side = (parent->zebraval * 2 + d) % 5;
if(d == 8) side = ((parent->zebraval-d1) * 3) % 5;
return build(parent, d, d1, 9, side, delta);
}
#endif
heptagon *createStep(heptagon *parent, int d) {
auto h = parent;
switch(d) {
case bd_right: {
if(mapside(h) > 0 && type_of(h) == 7)
return path(h, d, bd_left, {bd_left, bd_down, bd_right, bd_up});
else if(mapside(h) >= 0)
return build(parent, bd_right, bd_left, type_of(parent) ^ 1, 1, 0);
else if(type_of(h) == 6)
return path(h, d, bd_left, {bd_down, bd_right, bd_up, bd_left});
else
return path(h, d, bd_left, {bd_down_right, bd_up});
}
case bd_left: {
if(mapside(h) < 0 && type_of(h) == 7)
return path(h, d, bd_right, {bd_right, bd_down, bd_left, bd_up});
else if(mapside(h) <= 0)
return build(parent, bd_left, bd_right, type_of(parent) ^ 1, -1, 0);
else if(type_of(h) == 6)
return path(h, d, bd_right, {bd_down, bd_left, bd_up, bd_right});
else
return path(h, d, bd_right, {bd_down_left, bd_up});
}
case bd_up_right: {
return path(h, d, bd_down_left, {bd_up, bd_right});
}
case bd_up_left: {
return path(h, d, bd_down_right, {bd_up, bd_left});
}
case bd_up:
return build(parent, bd_up, bd_down, 6, mapside(parent), 1);
default:
/* bd_down */
if(type_of(h) == 6) {
if(mapside(h) == 0)
return build(parent, bd_down, bd_up, 6, 0, -1);
else if(mapside(h) == 1)
return path(h, d, bd_up, {bd_left, bd_left, bd_down, bd_right});
else if(mapside(h) == -1)
return path(h, d, bd_up, {bd_right, bd_right, bd_down, bd_left});
}
/* bd_down_left */
else if(d == bd_down_left) {
return path(h, d, bd_up_right, {bd_left, bd_down});
}
else if(d == bd_down_right) {
return path(h, d, bd_up_left, {bd_right, bd_down});
}
}
printf("error: case not handled in binary tiling\n");
breakhere();
return NULL;
}
#if MAXDIM==4
heptagon *createStep3(heptagon *parent, int d) {
auto h = parent;
switch(d) {
case 0: case 1:
case 2: case 3:
return build3(parent, d, 8, 1);
case 8:
return build3(parent, 8, hrand(4), -1);
case 4:
parent->cmove(8);
if(parent->c.spin(8) & 1)
return path(h, 4, 5, {8, parent->c.spin(8) ^ 1});
else
return path(h, 4, 5, {8, 4, parent->c.spin(8) ^ 1});
case 5:
parent->cmove(8);
if(!(parent->c.spin(8) & 1))
return path(h, 5, 4, {8, parent->c.spin(8) ^ 1});
else
return path(h, 5, 4, {8, 5, parent->c.spin(8) ^ 1});
case 6:
parent->cmove(8);
if(parent->c.spin(8) & 2)
return path(h, 6, 7, {8, parent->c.spin(8) ^ 2});
else
return path(h, 6, 7, {8, 6, parent->c.spin(8) ^ 2});
case 7:
parent->cmove(8);
if(!(parent->c.spin(8) & 2))
return path(h, 7, 6, {8, parent->c.spin(8) ^ 2});
else
return path(h, 7, 6, {8, 7, parent->c.spin(8) ^ 2});
}
printf("error: case not handled in binary tiling\n");
breakhere();
return NULL;
}
#endif
transmatrix direct_tmatrix[8];
transmatrix inverse_tmatrix[8];
void build_tmatrix() {
direct_tmatrix[0] = xpush(-log(2)) * parabolic3(-1, -1);
direct_tmatrix[1] = xpush(-log(2)) * parabolic3(1, -1);
direct_tmatrix[2] = xpush(-log(2)) * parabolic3(-1, 1);
direct_tmatrix[3] = xpush(-log(2)) * parabolic3(1, 1);
direct_tmatrix[4] = parabolic3(-2, 0);
direct_tmatrix[5] = parabolic3(+2, 0);
direct_tmatrix[6] = parabolic3(0, -2);
direct_tmatrix[7] = parabolic3(0, +2);
for(int i=0; i<8; i++)
inverse_tmatrix[i] = inverse(direct_tmatrix[i]);
}
const transmatrix& tmatrix(heptagon *h, int dir) {
if(dir == 8)
return inverse_tmatrix[h->c.spin(8)];
else
return direct_tmatrix[dir];
}
#if MAXDIM == 4
void queuecube(const transmatrix& V, ld size, color_t linecolor, color_t facecolor) {
ld yy = log(2) / 2;
const int STEP=3;
const ld MUL = 1. / STEP;
auto at = [&] (ld x, ld y, ld z) { curvepoint(V * parabolic3(size*x, size*y) * xpush0(size*yy*z)); };
for(int a:{-1,1}) {
for(ld t=-STEP; t<STEP; t++) at(a, 1,t*MUL);
for(ld t=-STEP; t<STEP; t++) at(a, -t*MUL,1);
for(ld t=-STEP; t<STEP; t++) at(a, -1,-t*MUL);
for(ld t=-STEP; t<STEP; t++) at(a, t*MUL,-1);
at(a, 1,-1);
queuecurve(linecolor, facecolor, PPR::LINE);
for(ld t=-STEP; t<STEP; t++) at(1,t*MUL,a);
for(ld t=-STEP; t<STEP; t++) at(-t*MUL,1,a);
for(ld t=-STEP; t<STEP; t++) at(-1,-t*MUL,a);
for(ld t=-STEP; t<STEP; t++) at(t*MUL,-1,a);
at(1,-1,a);
queuecurve(linecolor, facecolor, PPR::LINE);
for(ld t=-STEP; t<STEP; t++) at(1,a,t*MUL);
for(ld t=-STEP; t<STEP; t++) at(-t*MUL,a,1);
for(ld t=-STEP; t<STEP; t++) at(-1,a,-t*MUL);
for(ld t=-STEP; t<STEP; t++) at(t*MUL,a,-1);
at(1,a,-1);
queuecurve(linecolor, facecolor, PPR::LINE);
}
/*for(int a:{-1,1}) for(int b:{-1,1}) for(int c:{-1,1}) {
at(0,0,0); at(a,b,c); queuecurve(linecolor, facecolor, PPR::LINE);
}*/
}
#endif
transmatrix parabolic(ld u) {
return parabolic1(u * vid.binary_width / log(2) / 2);
}
transmatrix parabolic3(ld y, ld z) {
ld co = vid.binary_width / log(2) / 2;
return hr::parabolic13(y * co, z * co);
}
void draw() {
dq::visited.clear();
dq::enqueue(viewctr.at, cview());
while(!dq::drawqueue.empty()) {
auto& p = dq::drawqueue.front();
heptagon *h = get<0>(p);
transmatrix V = get<1>(p);
dynamicval<ld> b(band_shift, get<2>(p));
bandfixer bf(V);
dq::drawqueue.pop();
cell *c = h->c7;
if(!do_draw(c, V)) continue;
drawcell(c, V, 0, false);
if(DIM == 2) {
dq::enqueue(h->move(bd_up), V * xpush(-log(2)));
dq::enqueue(h->move(bd_right), V * parabolic(1));
dq::enqueue(h->move(bd_left), V * parabolic(-1));
if(c->type == 6)
dq::enqueue(h->move(bd_down), V * xpush(log(2)));
if(c->type == 7) {
dq::enqueue(h->move(bd_down_left), V * parabolic(-1) * xpush(log(2)));
dq::enqueue(h->move(bd_down_right), V * parabolic(1) * xpush(log(2)));
}
}
else {
for(int i=0; i<9; i++)
dq::enqueue(h->move(i), V * tmatrix(h, i));
}
}
}
transmatrix relative_matrix(heptagon *h2, heptagon *h1) {
if(gmatrix0.count(h2->c7) && gmatrix0.count(h1->c7))
return inverse(gmatrix0[h1->c7]) * gmatrix0[h2->c7];
transmatrix gm = Id, where = Id;
while(h1 != h2) {
if(h1->distance <= h2->distance) {
if(DIM == 3)
h2 = hr::createStep(h2, 8), where = inverse(tmatrix(h2, 8)) * where;
else {
if(type_of(h2) == 6)
h2 = hr::createStep(h2, bd_down), where = xpush(-log(2)) * where;
else if(mapside(h2) == 1)
h2 = hr::createStep(h2, bd_left), where = parabolic(+1) * where;
else if(mapside(h2) == -1)
h2 = hr::createStep(h2, bd_right), where = parabolic(-1) * where;
}
}
else {
if(DIM == 3)
h1 = hr::createStep(h1, 8), where = where * tmatrix(h1, 8);
else {
if(type_of(h1) == 6)
h1 = hr::createStep(h1, bd_down), gm = gm * xpush(log(2));
else if(mapside(h1) == 1)
h1 = hr::createStep(h1, bd_left), gm = gm * parabolic(-1);
else if(mapside(h1) == -1)
h1 = hr::createStep(h1, bd_right), gm = gm * parabolic(+1);
}
}
}
return gm * where;
}
#if CAP_COMMANDLINE
auto bt_config = addHook(hooks_args, 0, [] () {
using namespace arg;
if(argis("-btwidth")) {
shift_arg_formula(vid.binary_width, delayed_geo_reset);
return 0;
}
return 1;
});
#endif
int celldistance3(cell *c1, cell *c2) { // [untested]
int steps = 0;
int d1 = celldistAlt(c1);
int d2 = celldistAlt(c2);
while(d1 > d2) c1 = c1->cmove(8), steps++, d1--;
while(d2 > d1) c2 = c2->cmove(8), steps++, d2--;
vector<int> dx, dy;
while(c1 != c2) {
dx.push_back((c1->c.spin(8) & 1) - (c2->c.spin(8) & 1));
dy.push_back((c1->c.spin(8) >> 1) - (c2->c.spin(8) >> 1));
c1 = c1->cmove(8);
c2 = c2->cmove(8);
steps += 2;
}
int xsteps = steps, sx = 0, sy = 0;
while(isize(dx)) {
xsteps -= 2;
sx *= 2;
sy *= 2;
sx += dx.back(); sy += dy.back();
dx.pop_back(); dy.pop_back();
int ysteps = xsteps + abs(sx) + abs(sy);
if(ysteps < steps) steps = ysteps;
if(sx >= 8 || sx <= -8 || sy >= 8 || sy <= -8) break;
}
return steps;
}
#endif
}
}
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