Affine1.java

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

import java.io.IOException;

// Affine

public class Affine1 extends MIDlet
{
  public Affine1()
    {
      Affine1Canvas c = new Affine1Canvas();
      Display.getDisplay(this).setCurrent(c);
    }

  protected void startApp() {}
  protected void pauseApp() {}
  protected void destroyApp(boolean flag) {}
}

class Affine1Canvas extends Canvas
{
  public static final int BLACK  = 0x00000000;
  public static final int YELLOW = 0x00FFFF00;
  public static final int WHITE  = 0x00FFFFFF;

  // fill the rectangle area in the pixel data.
  //
  // @param pixels   the pixel data
  // @param width    width of the pixel data
  // @param height   height of the pixel data
  // @param x        x-coordinate of top-left corner of the filling rectangle
  // @param y        y-coordinate of top-left corner of the filling rectangle
  // @param w        width of the filling rectangle
  // @param h        height of the filling rectangle
  // @param c        color
  private void fillRect(int[] pixels, int width, int height,
                        int x, int y, int w, int h, int c)
    {
      for (int i = 0; i < h && i + y < height; ++i) {
        for (int j = 0; j < w && j + x < width; ++j) {
          pixels[i*width + j] = c;
        }
      }
    }

  protected void paint(Graphics g)
    {
      // setup a pixel data
      PixelData pixels = new PixelData(getWidth(), getHeight()); // <*>
      pixels.fillRect(0, 0, getWidth(), getHeight(), WHITE); // <*>

      // load image file
      try {
        PixelData sample_pixels = PixelData.createPixelData("/nekobean.png");

        // 画像の形は気にせず、配列の0要素目から順にコピーしてみる
        for (int i = 0; i < sample_pixels.length() && i < pixels.length(); ++i)
          pixels.setPixel(i, sample_pixels.getPixel(i)); // <*>
      }
      catch (IOException e) {
      }

      // fill the screen black
      g.setColor(BLACK);
      g.fillRect(0, 0, getWidth(), getHeight());

      // create image from pixel data
      Image img = pixels.createRGBImage(); // <*>

      // draw image
      g.drawImage(img, 0, 0, Graphics.LEFT | Graphics.TOP);
    }
}