java graphics2d 画圆_Java 使用Graphics2D 进行画图

import javax.imageio.ImageIO;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileOutputStream;

public class DrawByOpencv {

private static String source = “C:/Users/A/Desktop/desk/111.jpg”;

private static String target = “C:/Users/A/Desktop/desk/222.jpg”;

//画线条

private static void drawLine() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

//drawLine(int x1,int y1,int x2,int y2)

g2d.drawLine(100, 100, 100, 500);//画一条线段

// g2d.drawLine(100, 100, 100, 100);//画一个点。

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//画普通矩形

private static void drawRect() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

g2d.drawRect(200, 200, 300, 200);//画线框drawRect(int x,int y,int width,int height)

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//画圆角矩形

private static void drawRoundRect() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

g2d.drawRoundRect(200, 200, 300, 100, 20, 20);

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//画三维矩形

private static void draw3DRect() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

g2d.draw3DRect(80, 100, 40, 25, true);//画一个线框

g2d.fill3DRect(20, 70, 20, 30, true);//画一个着色块

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//画椭圆形

private static void drawOval() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

g2d.drawOval(10, 10, 60, 120);//画椭圆

g2d.setColor(Color.cyan);

g2d.fillOval(100, 30, 60, 60);//涂圆块

g2d.setColor(Color.magenta);

g2d.fillOval(15, 140, 100, 50);//涂椭圆

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//画圆弧

private static void drawArc() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

g2d.drawArc(10, 40, 90, 50, 0, 180);//画圆弧线

g2d.drawArc(100, 40, 90, 50, 180, 180);//画圆弧线

g2d.setColor(Color.yellow);

g2d.fillArc(10, 100, 40, 40, 0, -270);//填充缺右上角的四分之三的椭圆

g2d.setColor(Color.green);

g2d.fillArc(60, 110, 110, 60, -90, -270);//填充缺左下角的四分之三的椭圆

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//画多边形

private static void drawPolygon() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

int px1[] = {50, 90, 10, 50};//首末点相重,才能画多边形

int py1[] = {10, 50, 50, 10};

int px2[] = {140, 180, 170, 180, 140, 100, 110, 140};

int py2[] = {5, 25, 35, 45, 65, 35, 25, 5};

g2d.setColor(Color.blue);

g2d.fillPolygon(px1, py1, 4);

g2d.setColor(Color.red);

g2d.drawPolygon(px2, py2, 8);

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//擦除矩形块

private static void clearRect() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

g2d.setColor(Color.blue);

g2d.fillOval(50, 50, 100, 100);

g2d.clearRect(70, 70, 40, 55);

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//限定作图显示区域

private static void clipRect() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.setColor(Color.red);

g2d.clipRect(0, 0, 100, 50);

g2d.clipRect(50, 25, 100, 50);

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

//复制图形

private static void copyArea() throws Exception {

BufferedImage image = ImageIO.read(new File(source));

Graphics2D g2d = (Graphics2D) image.getGraphics();

g2d.setStroke(new BasicStroke(5));//BasicStroke(线条粗细)

g2d.drawRect(10, 10, 60, 90);

g2d.fillRect(90, 10, 60, 90);

g2d.copyArea(40, 50, 60, 70, -20, 80);

g2d.copyArea(110, 50, 60, 60, 10, 80);

FileOutputStream out = new FileOutputStream(target);

ImageIO.write(image, “jpeg”, out);

}

public static void main(String[] args) throws Exception {

drawRoundRect();

}

}