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rogueviz::flocking:: comments to make it self-contained, better help on range configuration, more general colors

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This commit is contained in:
Zeno Rogue 2018-11-20 12:50:00 +01:00
parent 99fc9085ee
commit 78c71fadfb
1 changed files with 50 additions and 13 deletions
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63
rogueviz-flocking.cpp
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@ -45,6 +45,14 @@ namespace flocking {
vector<tuple<hyperpoint, hyperpoint, color_t> > lines;
// parameters of each boid
// m->base: the cell it is currently on
// m->vel: velocity
// m->at: determines the position and speed:
// m->at * (0, 0, 1) is the current position (in Minkowski hyperboloid coordinates relative to m->base)
// m->at * (m->vel, 0, 0) is the current velocity vector (tangent to the Minkowski hyperboloid)
// m->pat: like m->at but relative to the screen
void init() {
if(!bounded) {
addMessage("Flocking simulation needs a bounded space.");
@ -57,6 +65,8 @@ namespace flocking {
const auto v = currentmap->allcells();
printf("computing relmatrices...\n");
// relmatrices[c1][c2] is the matrix we have to multiply by to
// change from c1-relative coordinates to c2-relative coordinates
for(cell* c1: v) {
manual_celllister cl;
cl.add(c1);
@ -73,6 +83,7 @@ namespace flocking {
printf("setting up...\n");
for(int i=0; i<N; i++) {
vertexdata& vd = vdata[i];
// set initial base and at to random cell and random position there
createViz(i, v[hrand(isize(v))], spin(hrand(100)) * xpush(hrand(100) / 200.));
vd.name = its(i+1);
vd.cp = dftcolor;
@ -113,12 +124,14 @@ namespace flocking {
for(int i=0; i<N; i++) {
vertexdata& vd = vdata[i];
auto m = vd.m;
hyperpoint velvec = hpxyz(m->vel, 0, 0);
transmatrix I = inverse(m->at);
// if(i == 0) display(I);
// we do all the computations here in the frame of reference
// where m is at (0,0,1) and its velocity is (m->vel,0,0)
hyperpoint velvec = hpxyz(m->vel, 0, 0);
hyperpoint sep = hpxyz(0, 0, 0);
int sep_count = 0;
@ -134,26 +147,40 @@ namespace flocking {
for(auto m2: monsat[p.first]) if(m != m2) {
ld vel2 = m2->vel;
transmatrix at2 = I * p.second * m2->at;
// at2 is like m2->at but relative to m->at
// m2's position relative to m (tC0 means *(0,0,1))
hyperpoint ac = tC0(at2);
// distance and azimuth to m2
ld di = hdist0(ac);
ld alpha = -atan2(ac);
color_t col = 0;
if(di < align_range) {
// we need to transfer m2's velocity vector to m's position
// this is done by applying an isometry which sends m2 to m1
// and maps the straight line on which m1 and m2 are to itself
align += gpushxto0(ac) * at2 * hpxyz(vel2, 0, 0);
align_count++;
col = 0xFF00FF;
col |= 0xFF00FF;
}
if(di < check_range) {
// azimuthal equidistant projection of ac
// (thus the cohesion force pushes us towards the
// average of azimuthal equidistant projections)
coh += spin(alpha) * hpxyz(di, 0, 0);
coh_count++;
col |= 0xFFFF;
}
if(di < sep_range) {
sep -= spin(alpha) * hpxyz(1 / di, 0, 0), sep_count++;
col = 0xFF0000FF;
sep -= spin(alpha) * hpxyz(1 / di, 0, 0);
sep_count++;
col |= 0xFF0000FF;
}
if(col && draw_lines)
@ -167,6 +194,7 @@ namespace flocking {
if(align_count) velvec += align * (d * align_factor / align_count);
if(coh_count) velvec += coh * (d * coh_factor / coh_count);
// hypot2 is the length of a vector in R^2
vels[i] = hypot2(velvec);
ld alpha = -atan2(velvec);
@ -180,6 +208,7 @@ namespace flocking {
for(int i=0; i<N; i++) {
vertexdata& vd = vdata[i];
auto m = vd.m;
// these two functions compute new base and at, based on pats[i]
m->rebasePat(pats[i]);
virtualRebase(m, true);
m->vel = vels[i];
@ -198,6 +227,10 @@ namespace flocking {
View = spin(90 * degree) * inverse(vdata[0].m->pat) * View;
if(follow == 2) {
// we take the average in R^3 of all the boid positions of the Minkowski hyperboloid
// (in quotient spaces, the representants closest to the current view
// are taken), and normalize the result to project it back to the hyperboloid
// (the same method is commonly used on the sphere AFAIK)
using namespace hyperpoint_vec;
hyperpoint h = Hypc;
for(int i=0; i<N; i++) h += tC0(vdata[i].m->pat);
@ -263,10 +296,12 @@ namespace flocking {
dialog::add_action([]() {
dialog::editNumber(sep_factor, 0, 2, .1, 1.5, "", "");
});
string rangehelp = "Increasing this parameter may also require increasing the 'check range' parameter.";
dialog::addSelItem("separation range", fts(sep_range), 'S');
dialog::add_action([]() {
dialog::editNumber(sep_range, 0, 2, .1, .5, "", "");
dialog::add_action([rangehelp]() {
dialog::editNumber(sep_range, 0, 2, .1, .5, "", rangehelp);
});
dialog::addSelItem("alignment factor", fts(align_factor), 'a');
@ -275,8 +310,8 @@ namespace flocking {
});
dialog::addSelItem("alignment range", fts(align_range), 'A');
dialog::add_action([]() {
dialog::editNumber(align_range, 0, 2, .1, .5, "", "");
dialog::add_action([rangehelp]() {
dialog::editNumber(align_range, 0, 2, .1, .5, "", rangehelp);
});
dialog::addSelItem("cohesion factor", fts(coh_factor), 'c');
@ -285,8 +320,8 @@ namespace flocking {
});
dialog::addSelItem("cohesion range", fts(coh_range), 'C');
dialog::add_action([]() {
dialog::editNumber(coh_range, 0, 2, .1, .5, "", "");
dialog::add_action([rangehelp]() {
dialog::editNumber(coh_range, 0, 2, .1, .5, "", rangehelp);
});
dialog::addSelItem("check range", fts(check_range), 't');
@ -301,7 +336,9 @@ namespace flocking {
"Value used in the algorithm: "
"only other boids in cells whose centers are at most 'check range' from the center of the current cell are considered. "
"Should be more than the other ranges by at least double the cell radius (in the current geometry, double the radius is " + fts(radius*2) + "); "
"but too large values slow the simulation down."
"but too large values slow the simulation down.\n\n"
"Restart the simulation to apply the changes to this parameter. In quotient spaces, the simulation may not work correctly when the same cell is in range check_range "
"in multiple directions."
);
});