java 用Graphic2D绘图简单例子

package graphic2d;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;

import javax.imageio.ImageIO;

public class Graphic2DTest {

	public static void draw() throws IOException{
		//绘制宽=480，长=640的图板
		int width=480,hight=720;
		BufferedImage image = new BufferedImage(width,hight,BufferedImage.TYPE_INT_RGB);
		//获取图形上下文,graphics想象成一个画笔
		Graphics2D graphics = (Graphics2D)image.getGraphics();
		
		//消除线条锯齿
		graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		
		//对指定的矩形区域填充颜色
		graphics.setColor(Color.ORANGE);	//GREEN:绿色；  红色：RED;   灰色：GRAY
		graphics.fillRect(0, 0, 240, 720);
		//对指定的矩形区域填充颜色
		graphics.setColor(Color.PINK);	
		graphics.fillRect(240, 0, 240, 720);
		
		//生成随机数
		Random random = new Random();
		/*
		 * 画线 x,y是坐标，定义线段的两个坐标点
		 */
		graphics.setColor(Color.BLACK);
		int x=100,y=100,x1=100,y1=y;
		graphics.drawLine(x,y,x+x1,y1);
		/*
		 *画出一个折线
		 */
		int[] xPoints = {100,100,250,250};
		int[] yPoints = {180,150,150,180};
		graphics.drawPolyline(xPoints, yPoints, 4);
		/*
		 * 画出一个闭合多边形(三角形)
		 */
		int[] xPoints1 = {100,100,200};
		int[] yPoints1 = {240,320,280};
		graphics.drawPolygon(xPoints1, yPoints1, 3);
		/*
		 * 画出一个闭合多边形(菱形)
		 */
		int[] xPoints2 = {240,300,360,300};
		int[] yPoints2 = {280,240,280,320};
		graphics.drawPolygon(xPoints2, yPoints2, 4);
		graphics.setColor(Color.ORANGE);
		graphics.fillPolygon(xPoints2, yPoints2, 4);
		/*
		 *绘制一个椭圆形 
		 */
		graphics.setColor(Color.GREEN);
		int xOval=100,yOval=360;
		graphics.drawOval(xOval, yOval, 100, 100);

		/*
		 *绘制一个矩形
		 */
		//graphics.setColor(Color.GRAY);//--设置矩形边框颜色 。GREEN:绿色；  红色：RED;   灰色：GRAY
		int xRect=240,yRect=360;
		graphics.drawRect(xRect, yRect, 200, 100);

		//设置文字颜色
		graphics.setColor(new Color( 20+random.nextInt(100),  20+random.nextInt(100),  20+random.nextInt(100) ));
		//设置文字内容、位置
		graphics.drawString("直线",100+50,100-5);
		graphics.drawString("折线", 200, 150-5);
		graphics.drawString("空心三角形", 110, 280);
		graphics.drawString("实心菱形", 300-20, 280);
		graphics.drawString("椭圆形", 100+50, 360+50);
		graphics.drawString("矩形", 240+50, 360+50);
		//graphics.drawString("错误的背景颜色", 100, 540);
		
		//graphics.setPaintMode();
		//graphics.translate(400, 600);
		
		graphics.dispose();//释放此图形的上下文并释放它所使用的所有系统资源
		FileOutputStream out=new FileOutputStream("d:/1.jpeg");
		ImageIO.write(image,"JPEG",out);
		
		out.flush();
		out.close();
		//super.doGet(request, response);

	}
	
	
	
	
	
	
	public static void main(String[] args) {
		try {
			draw();
		} catch (IOException e) {
			
			e.printStackTrace();
		}

	}

}

 

 

转自网络