Swing/RandomDissolve の変更点

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---
category: swing
folder: RandomDissolve
title: RandomDissolveで表示を切り替え
tags: [Animation, Graphics, BufferedImage, WritableRaster]
author: aterai
pubdate: 2007-03-26T20:17:32+09:00
description: RandomDissolve効果で表示する画像を切り替えます。
image: https://lh4.googleusercontent.com/_9Z4BYR88imo/TQTRdPqz07I/AAAAAAAAAhM/h3EaItM41Yw/s800/RandomDissolve.png
---
* 概要 [#summary]
`RandomDissolve`効果で表示する画像を切り替えます。

#download(https://lh4.googleusercontent.com/_9Z4BYR88imo/TQTRdPqz07I/AAAAAAAAAhM/h3EaItM41Yw/s800/RandomDissolve.png)

* サンプルコード [#sourcecode]
#code(link){{
class RandomDissolve extends JComponent implements ActionListener {
  private static final int STAGES = 16;
  private final Random rnd = new Random();
  private final Timer animator;
  private final transient BufferedImage image1;
  private final transient BufferedImage image2;
  private transient BufferedImage srcimg;
  private transient BufferedImage buf;
  private boolean mode = true;
  private int currentStage;
  private int[] src, dst, step;
  private int[] src;
  private int[] dst;
  private int[] step;

  public RandomDissolve(BufferedImage i1, BufferedImage i2) {
  protected RandomDissolve(BufferedImage i1, BufferedImage i2) {
    super();
    this.image1 = i1;
    this.image2 = i2;
    this.srcimg = copyImage(mode ? image2 : image1);
    animator = new Timer(10, this);
    this.buf = copyImage(mode ? image2 : image1);
    animator = new Timer(50, this);
  }

  public boolean nextStage() {
    if (currentStage > 0) {
      currentStage = currentStage - 1;
      for (int i = 0; i < step.length; i++) {
        if (step[i] == currentStage) {
          src[i] = dst[i];
        }
  private boolean nextStage() {
    return currentStage > 0 && copyNextStage();
  }

  @SuppressWarnings("PMD.AvoidArrayLoops")
  private boolean copyNextStage() {
    currentStage -= 1;
    for (int i = 0; i < step.length; i++) {
      if (step[i] == currentStage) {
        src[i] = dst[i];
      }
      return true;
    } else {
      return false;
    }
    return true;
  }

  private BufferedImage copyImage(final BufferedImage image) {
  private static BufferedImage copyImage(BufferedImage image) {
    int w = image.getWidth();
    int h = image.getHeight();
    BufferedImage result = new BufferedImage(
        w, h, BufferedImage.TYPE_INT_RGB);
    Graphics2D g = result.createGraphics();
    g.drawRenderedImage(image, null);
    g.dispose();
    BufferedImage result = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = result.createGraphics();
    g2.drawRenderedImage(image, null);
    g2.dispose();
    return result;
  }

  private int[] getData(BufferedImage image) {
  private static int[] getData(BufferedImage image) {
    WritableRaster wr = image.getRaster();
    DataBufferInt dbi = (DataBufferInt) wr.getDataBuffer();
    return dbi.getData();
    // return ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
  }

  public void animationStart() {
    currentStage = STAGES;
    srcimg = copyImage(mode ? image2 : image1);
    src = getData(srcimg);
    buf = copyImage(mode ? image2 : image1);
    src = getData(buf);
    dst = getData(copyImage(mode ? image1 : image2));
    step = new int[src.length];
    mode ^= true;
    Random rnd = new Random();
    for (int i = 0; i < step.length; i++) {
      step[i] = rnd.nextInt(currentStage);
    }
    animator.start();
  }

  @Override protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g.create();
    g2d.setPaint(getBackground());
    g2d.fillRect(0, 0, getWidth(), getHeight());
    g2d.drawImage(
        srcimg, 0, 0, srcimg.getWidth(), srcimg.getHeight(), this);
    g2d.dispose();
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setPaint(getBackground());
    g2.fillRect(0, 0, getWidth(), getHeight());
    g2.drawImage(buf, 0, 0, buf.getWidth(), buf.getHeight(), this);
    g2.dispose();
  }

  @Override public void actionPerformed(ActionEvent e) {
    if (nextStage()) {
      repaint();
    } else {
      animator.stop();
    }
  }
}
}}

* 解説 [#explanation]
- `BufferedImage`から`WritableRaster`を取得し、元画像と次の画像のコピーから`int`配列をそれぞれ作成
- 元画像の配列を次の画像のピクセルでランダムに置き換えて再描画することで画像の切り替えを実行

* 参考リンク [#reference]
- %%[https://community.oracle.com/thread/1270228 Java 2D - random pixelwise fading ?]%%
- [https://docs.oracle.com/javase/jp/8/docs/api/java/awt/image/WritableRaster.html WritableRaster (Java Platform SE 8)]

* コメント [#comment]
#comment
#comment