java 2d画图示例分享(用java画图)

Java 2D API通过扩展抽象窗口工具箱（AWT），为Java程序提供了二维图像，文本和图形的功能。这个复杂的渲染包支持线形图像，文本和图形，为富用户界面，复杂绘图程序和图像处理器开发者提供灵活的，功能强大的框架。Java 2D对象出现在一个平面中，称为用户坐标系空间，和设备坐标系空间。当对象在屏幕或打印机中渲染时，用户空间坐标系被转换成设备空间坐标系。

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Random;

import javax.imageio.*;
import javax.imageio.stream.ImageOutputStream;

public class test {
    public static void main(String[] args) throws IOException {
        int width = 800;
        int height = 800;

        BufferedImage image = new BufferedImage(
                width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = image.createGraphics();
        g2d.setColor(Color.white);
        g2d.fillRect(0, 0, width, height);
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        Random random = new Random();
        int wo = 0;
        int ho = 0;
        for (int i = 0; i < 10; i++) {
         int x = random.nextInt(width);
         int y = random.nextInt(height);
            g2d.setColor(new Color(random.nextInt(256),
                    random.nextInt(256), random.nextInt(256)));
            g2d.setStroke(new BasicStroke(1));
            g2d.drawString("node"+i, x, y);
            g2d.drawArc(x, y, 20, 20, 0, 360);
            if(i!=0){
             g2d.drawLine(wo, ho, x, y);
            }
            wo = x;
            ho = y;
        }
        g2d.dispose();
       

        ImageWriter writer = null;
        ImageTypeSpecifier type =
            ImageTypeSpecifier.createFromRenderedImage(image);
        Iterator iter = ImageIO.getImageWriters(type, "jpg");
        if (iter.hasNext()) {
            writer = (ImageWriter)iter.next();
        }
        if (writer == null) {
            return;
        }
        IIOImage iioImage = new IIOImage(image, null, null);
        ImageWriteParam param = writer.getDefaultWriteParam();

        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionQuality((float) ((10) / 10.0));
        ImageOutputStream outputStream =
          ImageIO.createImageOutputStream(new File("C:/test.jpg"));
        writer.setOutput(outputStream);
        writer.write(null, iioImage, param);
    }
}