1092 java概論

題目說明

利用 AWT 或 Swing 視窗介面寫出一個有選單的視窗程式，選單有紅、藍、綠三個選項，選了之後會畫出現底色為某顏色的六邊形。
紅藍綠 三個 swing button

參考解法

修改自java simple painter

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import javax.swing.JColorChooser;

public class hw2 extends Frame implements MouseListener, MouseMotionListener, ItemListener, ActionListener
{
    static hw2 frm = new hw2();
    static int x1, y1, x2, y2;
    static int stroke = 1;
    static Color color = Color.black;
    static int lines = 0;
    static Button line[];
    Graphics2D g;
    public static void main(String args[])
    {
        frm.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent e) { 
                 System.exit(0); 
            } 
        });	

        frm.setTitle("simple painter");
        frm.setSize(2000, 1000);
        frm.setLayout(null);
        set();
        frm.addMouseListener(frm);
        frm.addMouseMotionListener(frm);
        frm.setVisible(true);
    }

    public static void set()
    {
        Label lb = new Label("color");
        lb.setBounds(20, 30, 60, 20);
        frm.add(lb);
        line = new Button[3];
        line[0] = new Button("red");
        line[0].setBounds(80, 30, 50, 20);
        line[0].addActionListener(frm);
        line[1] = new Button("blue");
        line[1].setBounds(140, 30, 50, 20);
        line[1].addActionListener(frm);
        line[2] = new Button("green");
        line[2].setBounds(200, 30, 50, 20);
        line[2].addActionListener(frm);
        frm.add(line[0]);
        frm.add(line[1]);
        frm.add(line[2]);

    }

    public void mouseMoved(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mouseClicked(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}

    public void mousePressed(MouseEvent e)
    {
        x1 = e.getX();
        y1 = e.getY();

        if (lines == 0)
        {
            g.setColor(Color.red);
        }
        if (lines == 1)
        {
            g.setColor(Color.blue);
        }
        if (lines == 2)
        {
            g.setColor(Color.green);
        }

        double r=Math.pow(Math.pow(x2-x1, 2)+Math.pow(y2-y1, 2),0.5)/2;

	    update(g);
	  
	    int x[] = new int [6];
	    int y[] = new int [6];
  
	    Polygon a = new Polygon();
  
	    for(int i=0;i<6;++i)
        {
	    	 x[i]=(int)(x1+ r*Math.cos(360/6 * (i+1) * Math.PI / 180));
	    	 y[i]=(int)(y1+ r*Math.sin(360/6 * (i+1) * Math.PI / 180));
	    	 a.addPoint(x[i], y[i]);
	    }
	    g.drawPolygon(a);
	    g.fillPolygon(x,y,6);
    }

    public void mouseDragged(MouseEvent e) {}
    public void itemStateChanged(ItemEvent e) {}
    public void clear(Graphics2D g) {}

    public void choosered()
    {
        lines = 0;
    }

    public void chooseblue()
    {
        lines = 1;
    }

    public void choosegreen()
    {
        lines = 2;
    }

    public void actionPerformed(ActionEvent e)
    {
        Button b = (Button)e.getSource();
        g = (Graphics2D)getGraphics();     

        if (b == line[0]) 
            choosered();

        if (b == line[1]) 
            chooseblue();

        if (b == line[2])
            choosegreen();
    }
}