Swing/TexturePaint のバックアップの現在との差分(No.5)

• バックアップ一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• バックアップ を表示
• Swing/TexturePaint へ行く。

2023-10-12 (木) 10:58:52

• category: swing folder: TexturePaint title: TexturePaintを使って背景に画像を表示 tags: [TexturePaint, BufferedImage, Graphics2D] author: aterai pubdate: 2004-09-20T16:06:29+09:00 description: TexturePaintを使用して背景にタイル状に画像を貼り付けます。 image:

概要

Screenshot

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• Runnable JAR example.jar
• Source code src.zip
• Repository GitHub

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#spanend
#spanadd
String path = "example/16x16.png";
#spanend
#spanadd
ClassLoader cl = Thread.currentThread().getContextClassLoader();
#spanend
#spanadd
BufferedImage bi = Optional.ofNullable(cl.getResource(path)).map(url -> {
#spanend
  try (InputStream s = url.openStream()) {
    return ImageIO.read(s);
  } catch (IOException ex) {
    ex.printStackTrace();
    return makeMissingImage();
  }
#spanadd
}).orElseGet(MainPanel::makeMissingImage);
#spanend
#spanadd
texture = new TexturePaint(bi, new Rectangle(bi.getWidth(), bi.getHeight()));
#spanend
#spanadd
panel = new JPanel() {
#spanend
  @Override protected void paintComponent(Graphics g) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setPaint(texture);
    g2.fillRect(0, 0, getWidth(), getHeight());
    g2.dispose();
    super.paintComponent(g);
  }
#spanadd
}
#spanend
#spanadd

URL url = MainPanel.class.getResource("16x16.png");
BufferedImage img = null;
try {
  img = ImageIO.read(url);
}catch(IOException ioe) {
  ioe.printStackTrace();
}
Rectangle2D r2d = new Rectangle2D.Double(0,0,img.getWidth(),img.getHeight());
texture = new TexturePaint(img, r2d);

• BufferedImageを生成
• このImageをGraphics#drawImage(...)で描画するのではなく、TexturePaintを作成しGraphics2D#setPaintメソッドで設定してパネル全体の塗りつぶしを実行

public void paintComponent(Graphics g) {
  Graphics2D g2 = (Graphics2D)g;
  g2.setPaint(texture);
  g2.fillRect(0, 0, getWidth(), getHeight());
  super.paintComponent(g);
}

• TexturePaint (Java Platform SE 8)
• JPanelの背景に画像を並べる

• ST/BackgroundImage？