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/* Starshatter: The Open Source Project
Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
Copyright (c) 1997-2006, Destroyer Studios LLC.
AUTHOR: John DiCamillo
OVERVIEW
========
Level of Detail manager class
*/
#include "DetailSet.h"
#include "Random.h"
#include "Video.h"
// +--------------------------------------------------------------------+
SimRegion* DetailSet::ref_rgn = 0;
Point DetailSet::ref_loc;
// +--------------------------------------------------------------------+
DetailSet::DetailSet()
{
for (int i = 0; i < MAX_DETAIL; i++)
rad[i] = 0;
index = -1;
levels = 0;
rgn = 0;
}
DetailSet::~DetailSet()
{
Destroy();
}
// +--------------------------------------------------------------------+
int
DetailSet::DefineLevel(double r, Graphic* g, Point* o, Point* spin_rate)
{
if (levels < MAX_DETAIL && rep[levels].size() == 0) {
rad[levels] = r;
if (g)
rep[levels].append(g);
if (o)
off[levels].append(o);
else if (g)
off[levels].append(new Point(0,0,0));
if (rate.size() == 0) {
if (spin_rate) {
rate.append(spin_rate);
// randomize the initial orientation:
Point* initial_spin = new Point();
if (spin_rate->x != 0) initial_spin->x = Random(-PI, PI);
if (spin_rate->y != 0) initial_spin->y = Random(-PI, PI);
if (spin_rate->z != 0) initial_spin->z = Random(-PI, PI);
spin.append(initial_spin);
}
else {
rate.append(new Point());
spin.append(new Point());
}
}
else {
if (spin_rate)
rate[ rep[levels].size() - 1 ] = spin_rate;
}
levels++;
}
return levels-1;
}
void
DetailSet::AddToLevel(int level, Graphic* g, Point* offset, Point* spin_rate)
{
if (g && level >= 0 && level < levels) {
rep[level].append(g);
if (!offset)
offset = new Point(0,0,0);
off[level].append(offset);
if (spin_rate) {
int nrep = rep[level].size();
if (nrep > rate.size())
rate.append(spin_rate);
else
rate[ nrep-1 ] = spin_rate;
}
if (spin.size() < rep[level].size()) {
Point* initial_spin = new Point();
if (spin_rate) {
// randomize the initial orientation:
if (spin_rate->x != 0) initial_spin->x = Random(-PI, PI);
if (spin_rate->y != 0) initial_spin->y = Random(-PI, PI);
if (spin_rate->z != 0) initial_spin->z = Random(-PI, PI);
}
spin.append(initial_spin);
}
}
}
int
DetailSet::NumModels(int level) const
{
if (level >= 0 && level < levels)
return rep[level].size();
return 0;
}
// +--------------------------------------------------------------------+
void
DetailSet::ExecFrame(double seconds)
{
for (int i = 0; i < spin.size() && i < rate.size(); i++)
(*spin[i]) += (*rate[i]) * seconds;
}
// +--------------------------------------------------------------------+
void
DetailSet::SetLocation(SimRegion* r, const Point& p)
{
rgn = r;
loc = p;
}
// +--------------------------------------------------------------------+
void
DetailSet::SetReference(SimRegion* r, const Point& p)
{
ref_rgn = r;
ref_loc = p;
}
// +--------------------------------------------------------------------+
int
DetailSet::GetDetailLevel()
{
index = 0;
if (rgn == ref_rgn) {
double screen_width = Video::GetInstance()->Width();
Point delta = loc - ref_loc;
double distance = delta.length();
for (int i = 1; i < levels && rad[i] > 0; i++) {
double apparent_feature_size = (rad[i] * screen_width) / distance;
if (apparent_feature_size > 0.4)
index = i;
}
}
return index;
}
// +--------------------------------------------------------------------+
Graphic*
DetailSet::GetRep(int level, int n)
{
if (level >= 0 && level < levels && n >= 0 && n < rep[level].size())
return rep[level].at(n);
return 0;
}
Point
DetailSet::GetOffset(int level, int n)
{
if (level >= 0 && level < levels && n >= 0 && n < off[level].size())
return *(off[level].at(n));
return Point();
}
Point
DetailSet::GetSpin(int level, int n)
{
if (n >= 0 && n < spin.size())
return *(spin.at(n));
return Point();
}
// +--------------------------------------------------------------------+
void
DetailSet::Destroy()
{
for (int i = 0; i < levels; i++) {
ListIter<Graphic> iter = rep[i];
while (++iter) {
Graphic* g = iter.removeItem();
g->Destroy(); // this will delete the object (g)
}
off[i].destroy();
}
rate.destroy();
spin.destroy();
}
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