java drawing merge image AlphaComposite mode test

package com.hdwang.test; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.awt.image.BufferedImage; import java.util.HashMap; 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()); JLabel label = new JLabel(); label.setText("组合模式："); contentPanel.add(label); 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); 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(0,35,500,440); drawPanel.setPreferredSize(new Dimension(500,440)); drawPanel.setBorder(BorderFactory.createLineBorder(Color.red)); //设置边框 drawPanel.setBg(bg); drawPanel.setImage(image); // drawPanel.setAlphaComposite(AlphaComposite.SrcAtop); contentPanel.add(drawPanel); Map 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 } } }); //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; 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; } /** * 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); }else{ //默认SrcOver g2d.setComposite(AlphaComposite.SrcOver); } 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(); } } }