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/*
* trail.cc
* DIN Is Noise is copyright (c) 2006-2017 Jagannathan Sampath
* For more information, please visit http://dinisnoise.org/
*/
#include "dingl.h"
#include "trail.h"
trail_t::trail_t (int _e, int _max) {
max_points = _max;
num_points = 0;
}
void trail_t::add (float x, float y) {
if (x != last.x || y != last.y) {
int dt = num_points - max_points;
if (dt >= 0) {
int npops = dt + 1;
for (int i = 0; i < npops; ++i) tq.pop_front ();
num_points -= npops;
}
tq.push_back (point<float>(x, y));
++num_points;
last.x = x;
last.y = y;
}
}
void trail_t::change_size (int delta) {
max_points += delta;
if (max_points < 1) max_points = 1;
}
void trail_t::draw () {
if (n_tpts < num_points) {
if (tpts) delete[] tpts;
tpts = new float [2 * num_points];
n_tpts = num_points;
}
int m = 0, n = 0;
for (std::list< point<float> >::iterator iter = tq.begin (), jter = tq.end (); iter != jter; ++iter) {
point<float>& p = *iter;
tpts[m++] = p.x; tpts[m++]=p.y;
++n;
}
glVertexPointer (2, GL_FLOAT, 0, tpts);
glDrawArrays (GL_LINE_STRIP, 0, n);
}