Java利用AlphaComposite类合并图像

package com.hdwang.test;import javax.swing.*;import javax.swing.event.ChangeEvent;import javax.swing.event.ChangeListener;import java.awt.*;import java.awt.event.*;import java.awt.image.BufferedImage;import java.util.HashMap;import java.util.Hashtable;import java.util.Map;/** * Created by hdwang on 2018/10/11. */public class TestDrawing { public static void main(String[] args) { testComposite(); } /** * 合成测试 */ public static void testComposite() { //创建背景图片（带透明分量的） BufferedImage bg = new BufferedImage(300, 300, BufferedImage.TYPE_INT_ARGB); Graphics2D bgGraphics = (Graphics2D) bg.getGraphics(); bgGraphics.setColor(Color.yellow); //设置颜色 bgGraphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); //边缘抗锯齿 bgGraphics.fillRect(0, 0, bg.getWidth(), bg.getHeight()); //填充矩形 bgGraphics.setColor(Color.BLACK); bgGraphics.setFont(new Font('楷体', Font.ITALIC, 50)); bgGraphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); //文本抗锯齿 bgGraphics.drawString('背景黄色', 50, 150); //画文本 bgGraphics.dispose(); //创建第二张图片 BufferedImage image = new BufferedImage(300, 300, BufferedImage.TYPE_INT_ARGB); Graphics2D imageGraphics = (Graphics2D) image.getGraphics(); imageGraphics.setColor(Color.GREEN); imageGraphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); imageGraphics.fillRoundRect(0, 0, image.getWidth(), image.getHeight(), image.getWidth(), image.getHeight()); imageGraphics.setColor(Color.BLACK); imageGraphics.setFont(new Font('楷体', Font.ITALIC, 50)); imageGraphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); imageGraphics.drawString('前景绿色', 50, 200); imageGraphics.dispose(); JFrame jf = new JFrame(); //窗体 JPanel contentPanel = new JPanel(); //内容面板 contentPanel.setBorder(BorderFactory.createLineBorder(Color.blue)); //设置边框 //contentPanel.setLayout(new BorderLayout()); //添加标签 JLabel label = new JLabel(); label.setText('组合模式：'); contentPanel.add(label); //添加下拉框 JComboBox comboBox = new JComboBox(); comboBox.addItem('默认'); comboBox.addItem('CLEAR'); comboBox.addItem('SRC'); comboBox.addItem('DST'); comboBox.addItem('SRC_OVER'); comboBox.addItem('DST_OVER'); comboBox.addItem('SRC_IN'); comboBox.addItem('DST_IN'); comboBox.addItem('SRC_OUT'); comboBox.addItem('DST_OUT'); comboBox.addItem('SRC_ATOP'); comboBox.addItem('DST_ATOP'); comboBox.addItem('XOR'); contentPanel.add(comboBox); JLabel label2 = new JLabel(); label2.setText('源图非透明度：'); contentPanel.add(label2); //添加滑动条([0-10]=>[0,0.1,0.2,.... 1.0]) JSlider jSlider = new JSlider(0,10,10); jSlider.setMajorTickSpacing(5); // 设置主刻度间隔 jSlider.setMinorTickSpacing(1); // 设置次刻度间隔 jSlider.setPaintTicks(true); // 绘制刻度 jSlider.setPaintLabels(true); // 绘制标签 jSlider.setSnapToTicks(true); // 对其到刻度取值 /* * 给指定的刻度值显示自定义标签 */ Hashtable<Integer, JComponent> hashtable = new Hashtable<Integer, JComponent>(); hashtable.put(0, new JLabel('0')); // 0 刻度位置，显示 '0' hashtable.put(5, new JLabel('0.5')); // 5 刻度位置，显示 '0.5' hashtable.put(10, new JLabel('1')); // 10 刻度位置，显示 '1' jSlider.setLabelTable(hashtable); //将刻度值和自定义标签的对应关系设置到滑块（设置后不再显示默认的刻度值） contentPanel.add(jSlider); jf.setContentPane(contentPanel); //窗体设置内容面板为jp jf.setBounds(200, 200, 500, 500); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jf.setVisible(true); //窗体可见 DrawingPanel drawPanel = new DrawingPanel(); drawPanel.setBounds(0,60,500,415); drawPanel.setPreferredSize(new Dimension(500,415)); drawPanel.setBorder(BorderFactory.createLineBorder(Color.red)); //设置边框 drawPanel.setBg(bg); drawPanel.setImage(image); // drawPanel.setAlphaComposite(AlphaComposite.SrcAtop); contentPanel.add(drawPanel); Map<String,AlphaComposite> compositeMap = new HashMap<>(); compositeMap.put('CLEAR',AlphaComposite.Clear); compositeMap.put('SRC',AlphaComposite.Src); compositeMap.put('DST',AlphaComposite.Dst); compositeMap.put('SRC_OVER',AlphaComposite.SrcOver); compositeMap.put('DST_OVER',AlphaComposite.DstOver); compositeMap.put('SRC_IN',AlphaComposite.SrcIn); compositeMap.put('DST_IN',AlphaComposite.DstIn); compositeMap.put('SRC_OUT',AlphaComposite.SrcOut); compositeMap.put('DST_OUT',AlphaComposite.DstOut); compositeMap.put('SRC_ATOP',AlphaComposite.SrcAtop); compositeMap.put('DST_ATOP',AlphaComposite.DstAtop); compositeMap.put('XOR',AlphaComposite.Xor); //下拉框选中事件 comboBox.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent e) {if(e.getStateChange() == ItemEvent.SELECTED){ String selected = e.getItem().toString(); System.out.println(selected); drawPanel.setAlphaComposite(compositeMap.get(selected)); drawPanel.repaint(); //重画} } }); //滑动条改变事件 jSlider.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) {int val = jSlider.getValue();float alpha = (float) (val / 10.0);System.out.println('alpha:'+alpha);drawPanel.setAlpha(alpha);drawPanel.repaint(); //重画 } }); //窗体改变事件 jf.addWindowStateListener(new WindowStateListener() { @Override public void windowStateChanged(WindowEvent e) {System.out.println('window state:'+e.paramString()); } }); } static class DrawingPanel extends JPanel{ BufferedImage bg; BufferedImage image; AlphaComposite alphaComposite; float alpha = 1.0f; //源图非透明度（新加的图） public BufferedImage getBg() { return bg; } public void setBg(BufferedImage bg) { this.bg = bg; } public BufferedImage getImage() { return image; } public void setImage(BufferedImage image) { this.image = image; } public AlphaComposite getAlphaComposite() { return alphaComposite; } public void setAlphaComposite(AlphaComposite alphaComposite) { this.alphaComposite = alphaComposite; } public float getAlpha() { return alpha; } public void setAlpha(float alpha) { this.alpha = alpha; } /** * 重写paint方法 * @param g */ @Override public void paint(Graphics g){ //调用的super.paint(g),让父类做一些事前的工作，如刷新屏幕 super.paint(g); //在面板上画画 Graphics2D g2d = (Graphics2D)g; g2d.setComposite(AlphaComposite.Src); g2d.drawImage(bg,100,100,null); //背景图 if(alphaComposite!=null) {g2d.setComposite(alphaComposite.derive(alpha)); }else{//默认SrcOverg2d.setComposite(AlphaComposite.SrcOver.derive(alpha)); } g2d.drawImage(image,100,100,null); //叠加图 //g2d.setColor(Color.GREEN); //g2d.fillRoundRect(100,100,image.getWidth(),image.getHeight(),image.getWidth(),image.getHeight()); //叠加图层 g2d.dispose(); } }}

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