Graphics2D 画图

package com.poly;

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.GeneralPath;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Random;

public class LoadImageApp {



    BufferedImage img;
    int segmentSize=5;
    int segmentWidth = 400;
    int rowSize=20;
    int rowHeight = 90;
    int titleHeight = 110;
    int noWidth = 100;//序号长度
    int timeAddedWidth = 300;//时间增量长度
    int middleWidth = segmentWidth*(segmentSize+1);//中间部分的长度
    int briefWidth = 400;//摘要长度
    int headDown = 65;
//    int padding  = 20;
//    int halfPadding = padding/2;

    public LoadImageApp() {
        try {
            img = new BufferedImage(noWidth+timeAddedWidth+middleWidth+briefWidth,rowHeight*rowSize,BufferedImage.TYPE_INT_ARGB);
        } catch (Exception e) {
            e.printStackTrace();
        }
        int imgWidth = img.getWidth();
        int imgHeight = img.getHeight();
        Color green = new Color(55,105,86);
        Color grey = new Color(221,221,221);
        Color deepGrey = new Color(221,227,231);
        Color moreGrey = new Color(242,247,250);
        Font font = new Font("微软雅黑", Font.BOLD, 36);


        Graphics2D g2 = img.createGraphics();
        //背景
        g2.setBackground(Color.WHITE);
        g2.clearRect(0,0,img.getWidth(),img.getHeight());



        //head线
        g2.setStroke(createStroke(6));
        g2.setColor(green);
        g2.drawLine(0,titleHeight,imgWidth,titleHeight);
        //head填充
        g2.setColor(deepGrey);
        g2.fillRect(0,0,imgWidth,titleHeight);


        g2.setStroke(createStroke(4));
//        g2.setColor(grey);
        //偶数行填充深灰色
        for(int i=1;i<rowSize;i++){
//            g2.drawLine(halfPadding,(halfPadding+titleHeight)+rowHeight*i,imgWidth-halfPadding,(halfPadding+titleHeight)+rowHeight*i);

            //偶数行不同颜色
            if(i%2==0){
                g2.setColor(moreGrey);
                g2.fillRect(0,titleHeight+rowHeight*(i-1),imgWidth,rowHeight);
            }

            g2.setFont(font);
            g2.setColor(Color.BLACK);
            //序号
            g2.drawString(String.valueOf(i),49,titleHeight+52+rowHeight*(i-1));
            //时间增量
            NumberFormat numberFormat = new DecimalFormat("0.000000000");
            g2.drawString(numberFormat.format(0.000000001*i*10),140,titleHeight+52+rowHeight*(i-1));

            for(int j=0;j<segmentSize+1;j++){
                //箭头
                drawAL(noWidth+timeAddedWidth+segmentWidth/2+(segmentWidth*i),titleHeight+72+rowHeight*(i-1),noWidth+timeAddedWidth+segmentWidth/2+(segmentWidth*(i+1)),titleHeight+72+rowHeight*(i-1),g2);
            }


        }
        //序号和时间增量后的白线
        g2.setColor(Color.WHITE);
        g2.setStroke(createStroke(4));
        g2.drawLine(noWidth+timeAddedWidth,0,noWidth+timeAddedWidth,imgHeight);

        g2.setColor(Color.BLACK);
        g2.setStroke(createStroke(4));
        g2.setFont(font);
        g2.drawString("序号",40,headDown);
        g2.drawString("时间增量",170,headDown);


        for(int i=0;i<segmentSize+1;i++){

            //headIP
            g2.setFont(font);
            g2.setColor(Color.BLACK);
            g2.drawString("192.169.0.1",noWidth+timeAddedWidth+100+segmentWidth*i,headDown);
            //竖线
            g2.setColor(green);
            int x = noWidth+timeAddedWidth+(segmentWidth)/2+segmentWidth*i;
            g2.drawLine(x,titleHeight,x,imgHeight);

        }


//
    }

    public Stroke createStroke(int width){
        BasicStroke stroke = new BasicStroke(width,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);
        return stroke;
    }


    private  void drawAL(int sx, int sy, int ex, int ey, Graphics2D g2) {
        double H = 16; // 箭头高度
        double L = 10; // 底边的一半
        int x3 = 0;
        int y3 = 0;
        int x4 = 0;
        int y4 = 0;
        double awrad = Math.atan(L / H); // 箭头角度
        double arraow_len = Math.sqrt(L * L + H * H); // 箭头的长度
        double[] arrXY_1 = rotateVec(ex - sx, ey - sy, awrad, true, arraow_len);
        double[] arrXY_2 = rotateVec(ex - sx, ey - sy, -awrad, true, arraow_len);
        double x_3 = ex - arrXY_1[0]; // (x3,y3)是第一端点
        double y_3 = ey - arrXY_1[1];
        double x_4 = ex - arrXY_2[0]; // (x4,y4)是第二端点
        double y_4 = ey - arrXY_2[1];

        Double X3 = new Double(x_3);
        x3 = X3.intValue();
        Double Y3 = new Double(y_3);
        y3 = Y3.intValue();
        Double X4 = new Double(x_4);
        x4 = X4.intValue();
        Double Y4 = new Double(y_4);
        y4 = Y4.intValue();
        //起始线
        g2.setStroke(createStroke(4));
        g2.setColor(Color.BLACK);
        g2.drawLine(sx, sy, ex, ey);
        //箭头
//        g2.drawLine(ex, ey, x3, y3);
//        g2.drawLine(ex, ey, x4, y4);
//        三角形箭头
        GeneralPath triangle = new GeneralPath();
        triangle.moveTo(ex, ey);
        triangle.lineTo(x3, y3);
        triangle.lineTo(x4, y4);
        triangle.closePath();
//        实心箭头
        g2.fill(triangle);
        //非实心箭头
        //g2.draw(triangle);

    }
    private static double[] rotateVec(int px, int py, double ang,
                                      boolean isChLen, double newLen) {
        double mathstr[] = new double[2];
        // 矢量旋转函数，参数含义分别是x分量、y分量、旋转角、是否改变长度、新长度
        double vx = px * Math.cos(ang) - py * Math.sin(ang);
        double vy = px * Math.sin(ang) + py * Math.cos(ang);
        if (isChLen) {
            double d = Math.sqrt(vx * vx + vy * vy);
            vx = vx / d * newLen;
            vy = vy / d * newLen;
            mathstr[0] = vx;
            mathstr[1] = vy;
        }
        return mathstr;
    }




    public static void main(String[] args) throws IOException {
        LoadImageApp a = new LoadImageApp();
        ImageIO.write(a.img,"png",new File("/home/Desktop/331.png"));

    }
}