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);
    }
}