java绘图合并图像AlphaComposite模式测试

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<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
                }
            }
        });

        //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();
        }
    }
}