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SrcOver
g2d.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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