// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
/*
    This is an example illustrating the use of the perspective_window tool
    in the dlib C++ Library.  It is a simple tool for displaying 3D point
    clouds on the screen.
*/
#include <dlib/gui_widgets.h>
#include <dlib/image_transforms.h>
#include <cmath>
using namespace dlib;
using namespace std;
// ----------------------------------------------------------------------------------------
int main()
{
    // Let's make a point cloud that looks like a 3D spiral.
    std::vector<perspective_window::overlay_dot> points;
    dlib::rand rnd;
    for (double i = 0; i < 20; i += 0.001)
    {
        // Get a point on a spiral
        dlib::vector<double> val(sin(i), cos(i), i / 4);
        // Now add some random noise to it
        dlib::vector<double> temp(rnd.get_random_gaussian(),
            rnd.get_random_gaussian(),
            rnd.get_random_gaussian());
        val += temp / 20;
        // Pick a color based on how far we are along the spiral
        rgb_pixel color = colormap_jet(i, 0, 20);
        // And add the point to the list of points we will display
        points.push_back(perspective_window::overlay_dot(val, color));
    }
    // Now finally display the point cloud.
    perspective_window win;
    win.set_title("perspective_window 3D point cloud");
    win.add_overlay(points);
    win.wait_until_closed();
}
//  ----------------------------------------------------------------------------