如何淡出一个图像并淡入另一个图像（Java）？
我希望这样做，以便当一个图像淡出时，另一个图像渐渐消失。我有两个BufferedImages ，我正在使用AWT。
编辑：
package com.cgp.buildtown; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Cursor; import java.awt.Font; import java.awt.FontFormatException; import java.awt.Graphics; import java.awt.GraphicsEnvironment; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.border.EmptyBorder; public class Intro extends JPanel implements Runnable, MouseListener, MouseMotionListener { private static final long serialVersionUID = 1L; private Thread thread; private BufferedImage bg, bgsel, bg2, bg2sel; private JTextField tf = new JTextField(); private Font font; private int mousex, mousey; private boolean buttonClicked = false; public Intro() { super(); loadImages(); addMouseListener(this); addMouseMotionListener(this); setLayout(new BorderLayout()); setBorder(new EmptyBorder(100, 110, 150, 110)); tf.setHorizontalAlignment(JTextField.CENTER); tf.setFont(loadFont(50f)); tf.setBackground(new Color(255, 255, 205)); tf.setBorder(null); tf.setForeground(Color.BLACK); add(tf, BorderLayout.SOUTH); } private Font loadFont(Float f) { try { font = Font.createFont(Font.TRUETYPE_FONT, new File("res/komikatext.ttf")); GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); ge.registerFont(font); } catch (FontFormatException | IOException e) { e.printStackTrace(); } return font.deriveFont(f); } private void loadImages() { try { bg = ImageIO.read(new File("res/introbg1.png")); bgsel = ImageIO.read(new File("res/introbg1selected.png")); bg2 = ImageIO.read(new File("res/introbg2.png")); bg2sel = ImageIO.read(new File("res/introbg2selected.png")); } catch (IOException e) { e.printStackTrace(); } } public void addNotify() { super.addNotify(); thread = new Thread(this); thread.start(); } public void run() { while (true) { repaint(); if (!buttonClicked) { if (mousex >= 350 && mousex = 450 && mousey 0) setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); else setCursor(Cursor.getDefaultCursor()); } else { if (mousex >= 300 && mousex = 450 && mousey 0) setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); else setCursor(Cursor.getDefaultCursor()); } try { Thread.sleep(40); } catch (InterruptedException e) { e.printStackTrace(); } } } public void paintComponent(Graphics g) { super.paintComponent(g); if (!buttonClicked) { g.drawImage(bg, 0, 0, null); if (mousex >= 350 && mousex = 450 && mousey 0) g.drawImage(bgsel, 350, 450, null); } else if (buttonClicked) { g.drawImage(bg2, 0, 0, null); if (mousex >= 300 && mousex = 450 && mousey 0) g.drawImage(bg2sel, 300, 450, null); } } @SuppressWarnings("deprecation") public void mouseClicked(MouseEvent e) { if (mousex >= 350 && mousex = 450 && mousey 0 && !buttonClicked) { tf.setText(tf.getText() + "'s Town"); buttonClicked = true; } else if (mousex >= 350 && mousex = 450 && mousey 0 && buttonClicked) { BuildTown.replace(); thread.stop(); } } public void mouseMoved(MouseEvent e) { mousex = e.getX(); mousey = e.getY(); } public void mousePressed(MouseEvent e) { } public void mouseReleased(MouseEvent e) { } public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { } public void mouseDragged(MouseEvent e) { } }
您可以使用Trident插入您在类中定义的属性。 然后在绘画期间，您可以在AlphaComposite中将此属性用作alpha。 在这里您可以找到AlphaComposite的一些示例。
编辑：可能这可以帮助你：
//define a property to animate float opacity; //define timeline for animation Timeline timeline = new Timeline(this); timeline.addPropertyToInterpolate("opacity", 1.0f, 0.0f); timeline.play(); //inside painting ... Graphics2D g2d = (Graphics2D) g.create(); g2d.setComposite(AlphaComposite.SrcOver.derive(this.opacity)); g2d.drawImage(img1...); g2d.setComposite(AlphaComposite.SrcOver.derive(1.0 - this.opacity)); g2d.drawImage(img1...); g2d.dispose(); ...