TITLE:Borderのアニメーション

Borderのアニメーション

編集者:Terai Atsuhiro
作成日:2006-05-29
更新日:2019-12-25 (水) 19:44:35

概要

Borderの描画をアニメーションさせます。

#screenshot

サンプルコード

 class RippleBorder extends EmptyBorder {
   private final javax.swing.Timer animator;
   private final JComponent comp;
   public RippleBorder(JComponent c, int width) {
     super(width, width, width, width);
     this.comp = c;
     animator = new javax.swing.Timer(80, new ActionListener() {
       public void actionPerformed(ActionEvent e) {
         comp.repaint();
         count+=0.9f;
       }
     });
     comp.addMouseListener(new MouseAdapter() {
       public void mouseEntered(MouseEvent e) {
         comp.setForeground(Color.RED);
         startAnimation();
       }
       public void mouseExited(MouseEvent e) {
         comp.setForeground(Color.BLACK);
         stopAnimation();
       }
     });
   }
   boolean startflag = false;
   boolean stopflag  = false;
   public void startAnimation() {
     startflag = true;
     stopflag = false;
     animator.start();
   }
   public void stopAnimation() {
     stopflag = true;
   }
   private float count = 1.0f;
   public void paintBorder(Component c, Graphics g,
                           int x, int y, int w, int h) {
     if(!startflag) return;
     Graphics2D g2 = (Graphics2D)g;
     g2.setPaint(Color.WHITE);
     float a = 1.0f/count;
     if(0.12f-a>1.0e-2) a = 0.0f;
     g2.setComposite(
       AlphaComposite.getInstance(AlphaComposite.SRC_OVER,a));
     Insets i = getBorderInsets();
     int xx = i.left-(int)count;
     int yy = i.top-(int)count;
     int ww = i.left+i.right-(int)(count*2.0f);
     int hh = i.top+i.bottom-(int)(count*2.0f);
     g2.setStroke(new BasicStroke(count*1.2f));
     g2.drawRoundRect(xx, yy, w-ww, h-hh, 10, 10);
     if(xx<0) {
       count = 1.0f;
       if(stopflag) {
         animator.stop();
         startflag = false;
         stopflag = false;
         return;
       }
     }
   }
 }
  • &jnlp;
  • &jar;
  • &zip;

解説

コンポーネント上にカーソルがきた場合、Borderをアニメーションさせることで、波紋状の効果を描画しています。

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