/* JFlexiPix - Java implementation of FlexiPix output library
 *
 * Copyright 2010-2011 Stefan Schuermans <stefan blinkenarea org>
 *
 * 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 3 of the License.
 *
 *
 * 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 Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package org.blinkenarea.JFlexiPix.examples;

import org.blinkenarea.JFlexiPix.*;

public class Fade
{
  // entry point
  public static void main(String [] args)
  {
    String config;
    Display display;
    int width, height, i, x, y;
    byte [] image;

    // check usage
    if (args.length < 1) {
      System.out.println("usage: java Fade <config.flp>");
      return;
    }
    config = args[0];

    /* create a display, take configuration from a file,
       deliver messages to message method of new Msg object */
    try {
      display = new Display(config, new Msg());
    } catch (Exception e) {
      System.out.println("could not create display\n");
      e.printStackTrace();
      return;
    }

    // get size and show it
    width  = display.getWidth();
    height = display.getHeight();
    System.out.println("display size:");
    System.out.println(String.format("  width:  %5d", width ));
    System.out.println(String.format("  height: %5d", height));

    /* create an image with a nice fade:
       black to red from left to right,
       black to green from top to bottom */
    image = new byte [height * width * 3];
    i = 0;
    for (y = 0; y < height; ++y) {
      for (x = 0; x < width; ++x) {
        image[i++] = (byte)(255.0*x/(width -1)+0.5); // red
        image[i++] = (byte)(255.0*y/(height-1)+0.5); // green
        image[i++] = (byte)0;                        // no blue
      }
    }

    // output image
    display.data(image,
                 3,              // consecutive pixels are 3 bytes apart
                 width * 3,      // consecutive lines are width * 3 bytes apart
                 0,              // top-left pixel is at array index 0
                 0, 0,           // top-left pixel is 0,0
                 width, height); // image size is width,height
    display.send();

    // free display
    display = null;
  }
}