random-dots.cc

// -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// random-dots
// Copyright (c) 2016 Carl Gorringe (carl.gorringe.org)
// 4/22/2016
//
// Displays random dots on the Flaschen Taschen.
// https://noisebridge.net/wiki/Flaschen_Taschen
//
// How to run:
//
// By default, connects to the installation at Noisebridge. If using a
// different display (e.g. a local terminal display)
// pass the hostname as parameter:
//
//  ./random-dots localhost
//
// or set the environment variable FT_DISPLAY to not worry about it
//
//  export FT_DISPLAY=localhost
//  ./random-dots
//
// --------------------------------------------------------------------------------
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation version 2.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://gnu.org/licenses/gpl-2.0.txt>
//

#include "udp-flaschen-taschen.h"
#include "config.h"

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>

#define Z_LAYER 8      // (0-15) 0=background
#define DELAY 10

// random int in range min to max inclusive
int randomInt(int min, int max) {
  return (random() % (max - min + 1) + min);
}

int main(int argc, char *argv[]) {
    const char *hostname = NULL;   // Will use default if not set otherwise.
    if (argc > 1) {
        hostname = argv[1];        // Hostname can be supplied as first arg
    }

    srandom(time(NULL)); // seed the random generator

    // Open socket and create our canvas.
    const int socket = OpenFlaschenTaschenSocket(hostname);
    UDPFlaschenTaschen canvas(socket, DISPLAY_WIDTH, DISPLAY_HEIGHT);

    canvas.Clear();

    while (1) {
        int r = randomInt(0, 255);
        int g = randomInt(0, 255);
        int b = randomInt(0, 255);

        canvas.SetPixel(randomInt(0, DISPLAY_WIDTH-1), randomInt(0, DISPLAY_HEIGHT-1), Color(r, g, b));

        // send canvas
        canvas.SetOffset(0, 0, Z_LAYER);
        canvas.Send();
        usleep(DELAY * 1000);
    }
}