pixled/signal/triangle.cpp

A (relatively advanced) pixled::signal::Triangle example. But the Triangle function can be used exactly the same way as Sine, so also see the pixled/signal/sine.cpp example.

insane_triangle_ratial_t.gif

#include "pixled.h"
#include "pixled/gif_output.h"
 
using namespace pixled;
 
int main(int argc, char** argv) {
    pixled::LedPanel panel(16, 16, pixled::LEFT_RIGHT_RIGHT_LEFT_FROM_BOTTOM);
    pixled::GifOutput out(256, pixled::FIT_WIDTH, 20, panel);
 
    // Radial progressive wave
    {
        // Center of the radial wave
        auto center_x = 8.f * (1.f + pixled::Sine(pixled::T() / 30.f));
        auto animation = pixled::hsb(
                // Rainbow hue
                pixled::Rainbow(20),
                // Max saturation
                1.0,
                // Saturation = Radial progressive sine wave
                0.5f * (1.f + pixled::Sine(
                        // Distance between...
                        pixled::Distance(
                            // ... current point
                            pixled::Point(pixled::X(), pixled::Y()),
                            // ... and a point described by a triangle wave of
                            // parameter `center_x`
                            pixled::Point(
                                pixled::Cast<coordinate>(center_x),
                                8.f + 3.f * pixled::Triangle(center_x / 8.f)
                                )
                            )
                        / 8.f // Spatial period of the Sine
                        - pixled::T() / 10.f // Time component of the Sine
                        ))
                );
 
        pixled::Runtime runtime(panel, out, animation);
 
        // Writes 60 frames to gif file
        out.write(runtime, 60, "insane_triangle_radial_t.gif");
    }
}