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jpjf.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<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() {
            @Overridepublic 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() {
 
            @Overridepublic 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         */@Overridepublic  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();
        }
    }
}