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

abstract class Shape01 {
	int x, y, w, h;
	boolean f = false;
	Color c = null;

	public Shape01(int x, int y, int w, int h, boolean f, Color c) {
		this.x = x;
		this.y = y;
		this.w = w;
		this.h = h;
		this.f = f;
		this.c = c;
	}

	abstract void draw(Graphics g);
}

class Rect01 extends Shape01 {
	Rect01(int x, int y, int w, int h, boolean f, Color c){
		super(x, y, w, h, f, c);
	}
	@Override
	void draw(Graphics g){
		g.setColor(c);
		if(f){
			g.fillRect(x, y, w, h);
		}else{
			g.drawRect(x, y, w, h);
		}
	}
}

class Oval01 extends Shape01 {
	Oval01(int x, int y, int w, int h, boolean f, Color c){
		super(x, y, w, h, f, c);
	}
	@Override
	void draw(Graphics g){
		g.setColor(c);
		if(f){
			g.fillOval(x, y, w, h);
		}else{
			g.drawOval(x, y, w, h);
		}
	}
}

class Triu01 extends Shape01 {
	Triu01(int x, int y, int w, int h, boolean f, Color c){
		super(x, y, w, h, f, c);
	}
	@Override
	void draw(Graphics g){
		g.setColor(c);
		if(f){
			g.fillPolygon(new int[]{x, x + w / 2, x + w}, new int[]{y + h, y, y + h}, 3);
		}else{
			g.drawPolygon(new int[]{x, x + w / 2, x + w}, new int[]{y + h, y, y + h}, 3);
		}
	}
}

class Trid01 extends Shape01 {
	Trid01(int x, int y, int w, int h, boolean f, Color c){
		super(x, y, w, h, f, c);
	}
	@Override
	void draw(Graphics g){
		g.setColor(c);
		if(f){
			g.fillPolygon(new int[]{x, x + w / 2, x + w}, new int[]{y, y + h, y}, 3);
		}else{
			g.drawPolygon(new int[]{x, x + w / 2, x + w}, new int[]{y, y + h, y}, 3);
		}
	}
}

public class ShapeDraw01 {
	private JFrame frame = new JFrame("図形描画ソフト");
	private JPanel pane = (JPanel)frame.getContentPane();
	private JPanel panel = new JPanel();
	private ButtonGroup shapegrp = new ButtonGroup();
	private JRadioButton rect = new JRadioButton("■", true);
	private JRadioButton oval = new JRadioButton("●");
	private JRadioButton triu = new JRadioButton("▲");
	private JRadioButton trid = new JRadioButton("▼");
	private JButton button = new JButton("色の選択");
	private JPanel samp = new JPanel();
	private JCheckBox fill = new JCheckBox("塗りつぶし");
	private JButton clear = new JButton("消去");
	private int sx, sy, cx, cy;
	private Color color = Color.BLACK;;
	private Shape01 shape = null;
	private boolean dragg = false;
	LinkedList<Shape01> shapelist = new LinkedList<Shape01>();
	private Canvas canvas = new Canvas(){
		@Override
		public void update(Graphics g){
			paint(g);
		}

		@Override
		public void paint(Graphics g){
			Rectangle rec = g.getClipBounds();
			Image img = createImage(rec.width, rec.height);
			Graphics ofg = img.getGraphics();
			for(Shape01 s: shapelist){
				s.draw(ofg);
			}
			ofg.setColor(color);
			int x, y, w, h;
			if(sx <= cx){x = sx; w = cx - sx;}
			else{x = cx;w = sx - cx;}
			if(sy <= cy){y = sy; h = cy - sy;}
			else{y = cy;h = sy - cy;}
			if(rect.isSelected()){
				shape = new Rect01(x, y, w, h, fill.isSelected(), color);
			}else if(oval.isSelected()){
				shape = new Oval01(x, y, w, h, fill.isSelected(), color);
			}else if(triu.isSelected()){
				shape = new Triu01(x, y, w, h, fill.isSelected(), color);
			}else if(trid.isSelected()){
				shape = new Trid01(x, y, w, h, fill.isSelected(), color);
			}
			if(dragg) shape.draw(ofg);
			g.drawImage(img, 0, 0, this);
		}
	};
	
	public ShapeDraw01(){
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		panel.add(new JLabel("図形の選択"));
		shapegrp.add(rect);
		shapegrp.add(oval);
		shapegrp.add(triu);
		shapegrp.add(trid);
		panel.add(rect);
		panel.add(oval);
		panel.add(triu);
		panel.add(trid);
		button.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ev){
				color = JColorChooser.showDialog(button, "色を選択して下さい", Color.WHITE);
				samp.setBackground(color);
				canvas.repaint();
			}
		});
		panel.add(button);
		samp.add(new JLabel("   "));
		samp.setBackground(color);
		panel.add(samp);
		panel.add(fill);
		clear.addActionListener(new ActionListener(){
			@Override
			public void actionPerformed(ActionEvent ev){
				shapelist.removeLast();
				canvas.repaint();
			}
		});
		panel.add(clear);
		pane.add(panel, BorderLayout.NORTH);
		canvas.setBackground(Color.WHITE);
		canvas.setSize(400, 400);
		canvas.addMouseListener(new MouseAdapter(){
			@Override
			public void mousePressed(MouseEvent ev){
				sx = ev.getX();
				sy = ev.getY();
				dragg = true;
			}
			@Override
			public void mouseReleased(MouseEvent ev){
				shapelist.add(shape);
				dragg = false;
			}
		});
		canvas.addMouseMotionListener(new MouseMotionAdapter(){
			@Override
			public void mouseDragged(MouseEvent ev){
				cx = ev.getX();
				cy = ev.getY();
				canvas.repaint();
			}
		});
		pane.add(canvas);
		frame.pack();
		frame.setVisible(true);
	}
	
	public static void main(String[] args){
		G106WinLF.set();
		new ShapeDraw01();
	}
}