Java——图形程序设计3之利用Graphics绘制图形和绘制g2d图型

//绘制曲线
package assignment2;
import java.awt.*;
import javax.swing.*;


public class DrawingGraphics extends JFrame{
        public DrawingGraphics(){
            super("Drawing curve of the function");
            setSize(1000,1000);
            setVisible(true);
        }

        public void paint(Graphics g)
        {
            super.paint(g);
            int mid = 500;
            g.setColor(Color.black);
            g.drawLine(150,mid,850,mid);
            g.drawLine(mid,80,mid,850);

            int interval = 70;
            for(int i = 1; i < 10; i++)
            {
                g.drawLine(150+i*interval,mid-10,150+i*interval,mid);
                g.drawString(((-2.5 + 0.5*i) + ""),145+i*interval,mid+15);

            }
            for(int i = 1; i <= 10; i++)
            {
                g.drawLine(mid+10,80+i*interval,mid,80+i*interval);
                g.drawString((12-2*i) + "", mid - 15, 85+i*interval);
            }
            int xValues0[] = {mid-10,mid+10,mid};
            int yValues0[] = {80,80,60};
            int xValues1[] = {850,850,870};
            int yValues1[] = {mid+10,mid-10,mid};
            Polygon polygon0 = new Polygon(xValues0,yValues0,3);
            Polygon polygon1 = new Polygon(xValues1,yValues1,3);
            g.fillPolygon(polygon0);
            g.fillPolygon(polygon1);

            g.setColor(Color.red);
            int xValues2[] = new int[100];
            int yValues2[] = new int[100];
            int j = 0;
            for(double i = -2; i <= 2; i += 0.1)
            {
                xValues2[j] = (int)(i*140+mid);
                yValues2[j] = (int)(mid - (Math.pow(Math.E, i))*35);
                j++;
            }

            for(int i = 0; i+1 < j; i += 2)
                g.drawLine(xValues2[i],yValues2[i], xValues2[i+1], yValues2[i+1]);

            g.setColor(Color.blue);
            j = 0;
            for(double i = -2; i <= 2; i+= 0.1)
            {
                xValues2[j] = (int)(i*140+mid);
                yValues2[j] = (int)(mid - (i*i+1)*35);
                j++;
            }
            for(int i = 0; i+1 < j; i += 2)
                g.drawLine(xValues2[i],yValues2[i], xValues2[i+1], yValues2[i+1]);

            g.setColor(Color.gray);
            j = 0;
            for(double i = -2; i <= 2; i+= 0.1)
            {
                xValues2[j] = (int)(i*140+mid);
                yValues2[j] = (int)(mid - (i*i*i+1)*35);
                j++;
            }
            for(int i = 0; i+1 < j; i += 2)
                g.drawLine(xValues2[i],yValues2[i], xValues2[i+1], yValues2[i+1]);

            g.setColor(Color.black);
            g.drawRect(650, 650, 120, 150);
            g.drawString("e", 720, 680);
            g.drawString("x", 725, 670);
            g.drawString("x + 1", 720, 730);
            g.drawString("2", 725, 720);
            g.drawString("x + 1", 720, 780);
            g.drawString("3", 725, 770);
            g.setColor(Color.red);
            g.drawLine(660, 675, 710, 675);
            g.setColor(Color.blue);
            g.drawLine(660, 725, 710, 725);
            g.setColor(Color.gray);
            g.drawLine(660, 775, 710, 775);


        }

        public static void main(String args[])
        {
            DrawingGraphics application = new DrawingGraphics();
            application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        }
}

//绘制g2D图形
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
public class Main
{
    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                JFrame frame = new DrawFrame();
                frame.setTitle("Draw2D");
                frame.setSize(600,600);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}


class DrawFrame extends JFrame
{
    public DrawFrame()
    {
        add(new DrawComponent());
        pack();
    }
}

class DrawComponent extends JComponent
{
    private static final int DEAFAULT_WIDTH = 500;
    private static final int DEAFAULT_HEIGHT = 500;

    public void paintComponent(Graphics g)
    {
        Graphics2D g2 = (Graphics2D)g;
        //draw a rectangle
        double X = 100;
        double Y = 100;
        double w = 300;
        double h = 200;

        Rectangle2D re = new Rectangle2D.Double(X,Y,w,h);
        g2.draw(re);

        //draw ellipse
        Ellipse2D e = new Ellipse2D.Double(X,Y,w,h);
        g2.draw(e); 

        //draw ellipse 
         e.setFrame(re);
         g2.draw(e);        


        //draw Circle
         double rx = re.getCenterX();
         double ry = re.getCenterY();
         double radius = 200;

         Ellipse2D c = new Ellipse2D.Double();
         c.setFrameFromCenter(rx,ry,rx + radius,ry + radius);
         g2.draw(c);

    }
    public Dimension getPreferredSize(){return new Dimension(DEAFAULT_WIDTH,DEAFAULT_HEIGHT);}
}

import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
public class Main
{
    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                JFrame frame = new DrawFrame();
                frame.setTitle("Draw2D");
                frame.setSize(600,600);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}


class DrawFrame extends JFrame
{
    public DrawFrame()
    {
        add(new DrawComponent());
        pack();
    }
}

class DrawComponent extends JComponent
{
    private static final int DEAFAULT_WIDTH = 500;
    private static final int DEAFAULT_HEIGHT = 500;

    public void paintComponent(Graphics g)
    {
        Graphics2D g2 = (Graphics2D)g;
        //draw a rectangle
        double X = 100;
        double Y = 100;
        double w = 300;
        double h = 200;
        g2.setPaint(Color.RED);
        Rectangle2D re = new Rectangle2D.Double(X,Y,w,h);
        //g2.draw(re);
        g2.fill(re);  
        //draw ellipse
        g2.setPaint(Color.YELLOW);
        Ellipse2D e = new Ellipse2D.Double(X,Y,w,h);
        g2.fill(e); 


        //draw ellipse 
         e.setFrame(re);
         g2.draw(e);        

        //draw Circle
         double rx = re.getCenterX();
         double ry = re.getCenterY();
         double radius = 100;
         g2.setPaint(Color.GREEN);
         Ellipse2D c = new Ellipse2D.Double();
         c.setFrameFromCenter(rx,ry,rx + radius,ry + radius);
         g2.fill(c);

    }
    public Dimension getPreferredSize(){return new Dimension(DEAFAULT_WIDTH,DEAFAULT_HEIGHT);}
}