減少アクションリスナーでに変更g.scale(scale,scale);しますg.scale(0.5d,0.5d);
または、これを行うことができます...
int scale = 0.5;
//I can now resize images, based on my needs
BufferedImage bi = new BufferedImage(
icon.getIconWidth() * scale,
icon.getIconHeight() * scale,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g = bi.createGraphics();
g.scale(scale,scale);
icon.paintIcon(null,g,0,0);
g.dispose();
// This really isn't required...
//JLabel temp = new JLabel(new ImageIcon(bi));
//to ensure proper size is kept for the enlarged image
// There is a better way...
//CardLabelListener.selectedLabel.setSize( (icon.getIconWidth()/scale), (icon.getIconHeight()/(scale)));
// This isn't required
//CardLabelListener.selectedLabel.setIcon(temp.getIcon());
// This doesn't do what you think it does...
//CardLabelListener.selectedLabel.updateUI();
CardLabelListener.selectedLabel.setIcon(new ImageIcon(bi));
CardLabelListener.selectedLabel.setSize(CardLabelListener.selectedLabel.getPreferredSize());
これで、増加アルゴリズムと減少アルゴリズムの両方がほぼ同じになりました (係数を除く)。単一のメソッドを使用できるはずです;)
これは私が最終的に得たコードです...
public class ScaleMyIcon {
public static void main(String[] args) {
new ScaleMyIcon();
}
public ScaleMyIcon() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new ScaleMyIconPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
protected class ScaleMyIconPane extends JPanel {
public ScaleMyIconPane() {
setLayout(new BorderLayout());
ImageIcon image = null;
try {
image = new ImageIcon(ImageIO.read(getClass().getResource("/stormtrooper-tie.jpg")));
} catch (IOException ex) {
ex.printStackTrace();
}
JLabel label = new JLabel(image);
add(label);
JPanel buttons = new JPanel();
JButton increase = new JButton("+");
JButton decrease = new JButton("-");
buttons.add(increase);
buttons.add(decrease);
increase.addActionListener(new IncreaseSizeListener(label));
decrease.addActionListener(new DecreaseSizeListener(label));
add(buttons, BorderLayout.SOUTH);
}
}
public class Scaler {
public Icon getScaledInstance(Icon original, double scale) {
BufferedImage bi = new BufferedImage(
(int)Math.round(scale * original.getIconWidth()),
(int)Math.round(scale * original.getIconHeight()),
BufferedImage.TYPE_INT_ARGB);
Graphics2D g = bi.createGraphics();
g.scale(scale, scale);
original.paintIcon(null, g, 0, 0);
g.dispose();
return new ImageIcon(bi);
}
}
public class IncreaseSizeListener extends Scaler implements ActionListener {
private JLabel increasedLabel;
private IncreaseSizeListener(JLabel label) {
increasedLabel = label;
}
@Override
public void actionPerformed(ActionEvent e) {
Icon icon = increasedLabel.getIcon();
int scale = 2;
increasedLabel.setIcon(getScaledInstance(icon, scale));
}
}
public class DecreaseSizeListener extends Scaler implements ActionListener {
private JLabel decreasedLabel;
private DecreaseSizeListener(JLabel label) {
decreasedLabel = label;
}
@Override
public void actionPerformed(ActionEvent e) {
Icon icon = decreasedLabel.getIcon();
decreasedLabel.setIcon(getScaledInstance(icon, 0.5d));
}
}
}
別のアプローチで更新
あれこれいじっているうちに、2つの問題に気づきました。アップ スケールとダウン スケールの間に連携はなく、元のイメージを使用してスケーリングすることはなく、常にダーティ イメージをスケーリングしていました。画像を縮小してから、もう一度拡大してみてください。
これは、これらの問題を克服する方法についての私の見解です
public class ScaleMyIcon {
public static void main(String[] args) {
new ScaleMyIcon();
}
public ScaleMyIcon() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new ScaleMyIconPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
protected class ScaleMyIconPane extends JPanel {
public ScaleMyIconPane() {
setLayout(new BorderLayout());
ImageIcon image = null;
try {
image = new ImageIcon(ImageIO.read(getClass().getResource("/stormtrooper-tie.jpg")));
} catch (IOException ex) {
ex.printStackTrace();
}
JLabel label = new JLabel(image);
add(label);
JPanel buttons = new JPanel();
JButton increase = new JButton("+");
JButton decrease = new JButton("-");
buttons.add(increase);
buttons.add(decrease);
increase.addActionListener(new IncreaseSizeListener(label));
decrease.addActionListener(new DecreaseSizeListener(label));
add(buttons, BorderLayout.SOUTH);
}
}
public static class Scalable {
private JLabel label;
private Icon original;
private static double scale = 1;
private Scalable(JLabel label) {
this.label = label;
original = label.getIcon();
}
public JLabel getLabel() {
return label;
}
public double getScale() {
return scale;
}
public void setScale(double scale) {
this.scale = scale;
}
public void incrementScale(double factor) {
setScale(getScale() + factor);
}
public Icon getScaledInstance() {
BufferedImage bi = new BufferedImage(
(int) Math.round(scale * original.getIconWidth()),
(int) Math.round(scale * original.getIconHeight()),
BufferedImage.TYPE_INT_ARGB);
Graphics2D g = bi.createGraphics();
g.scale(scale, scale);
original.paintIcon(null, g, 0, 0);
g.dispose();
return new ImageIcon(bi);
}
}
public class IncreaseSizeListener extends Scalable implements ActionListener {
public IncreaseSizeListener(JLabel label) {
super(label);
}
@Override
public void actionPerformed(ActionEvent e) {
incrementScale(0.05);
getLabel().setIcon(getScaledInstance());
}
}
public class DecreaseSizeListener extends Scalable implements ActionListener {
private DecreaseSizeListener(JLabel label) {
super(label);
}
@Override
public void actionPerformed(ActionEvent e) {
incrementScale(-0.05);
getLabel().setIcon(getScaledInstance());
}
}
}