/*<pre>

  *     *
   *   *
  *******
 ** *** **
***********
* ******* *
* *     * *
   ** **

</pre>
*/

import java.awt.*;
import java.awt.image.*;
import java.applet.AudioClip;

public class Invaders extends MISApplet {

  private int[][] invaderRawData = {
    {0,0,1,0,0,0,0,0,1,0,0},
    {0,0,0,1,0,0,0,1,0,0,0},
    {0,0,1,1,1,1,1,1,1,0,0},
    {0,1,1,0,1,1,1,0,1,1,0},
    {1,1,1,1,1,1,1,1,1,1,1},
    {1,0,1,1,1,1,1,1,1,0,1},
    {1,0,1,0,0,0,0,0,1,0,1},
    {0,0,0,1,1,0,1,1,0,0,0}
  };

  //to be generated from above
  private int[][] invaderData;

  //sprite rectangle for the space invader
  private int invaderX, invaderY, invaderW, invaderH;

  private int[] bgColor = {0, 255, 0};
  private int[] invColor = {255, 255, 255};

  AudioClip sound;

  public void initialize()
  {
    invaderX = 0;
    invaderY = 20;

    scaleInvader(8);

    sound = getAudioClip(getCodeBase(), "ship.wav");
    sound.play();
  }

  public void initFrame(double time) {
    invaderX = (int)(W/2 * Math.sin(0.5 * Math.PI * time)) + W/2;
    invaderY = (int)(2*time * invaderH/2) - invaderH;

    invaderX -= invaderW/2; //center a bit better
    invaderY %= H + invaderH * 2;
  }

  public void setPixel(int x, int y, int rgb[])
  {
    int ix, iy; //coords relative to invader

    //check bounds
    if ((x < invaderX || x >= invaderX + invaderW) || (y < invaderY || y >= invaderY + invaderH))
    {
      rgb[0] = bgColor[0]; rgb[1] = bgColor[1]; rgb[2] = bgColor[2];
      return;
    }

    ix = x - invaderX;
    iy = y - invaderY;

    //skip empty pixels
    if (invaderData[iy][ix] == 0)
    {
      rgb[0] = bgColor[0]; rgb[1] = bgColor[1]; rgb[2] = bgColor[2];
      return;
    }

    rgb[0] = invColor[0]; rgb[1] = invColor[1]; rgb[2] = invColor[2];
  }

  private void scaleInvader(int scaleFactor)
  {
    int w = invaderRawData[0].length;
    int h = invaderRawData.length;

    invaderData = new int[scaleFactor*h][scaleFactor*w];

    for(int y = 0; y < h; y++)
    for(int x = 0; x < w; x++)
    {
      for (int i=0; i<scaleFactor; i++)
      for (int j=0; j<scaleFactor; j++)
      {
        invaderData[scaleFactor*y+i][scaleFactor*x+j] = invaderRawData[y][x];
      }
    }

    //sprite w,h
    invaderW = invaderData[0].length;
    invaderH = invaderData.length;
  }
}