shape.java

包含多个java程序

//Shape.java
import java.util.*;
import java.awt.*;

/**
 * Shape
 * @author  
 * @version 1.0 05/24/03
 *
 * Graphic is a compositer pattern,Picture is the note,and all others are leaves
 *
 */

abstract class Graphic
{
	abstract public	void	draw(Graphics g);
}

/**
 * Picture is the note
 */
class  Picture extends Graphic
{
	private ArrayList gList = new ArrayList(1);
	private int curNumber;

	public	void	add(Graphic g) {
		// First remove the objects after index curNumber,which is due to undo operation
		if(gList.size() > curNumber)
			for(int i=gList.size()-1; i>=curNumber; --i)
				gList.remove(i);
		gList.add(g);
		++curNumber;
	}
	
	public	Graphic	getLast() {
		if(curNumber>0)
			return (Graphic)gList.get(curNumber-1);
		else
			return null;
	}
	// This is just for redo operation
	public	void	add() {
		if( gList.size()>curNumber )
			++curNumber;
	}
	// This is just for undo operation
	public	void	remove() {
		if( curNumber>0 )
			--curNumber;
	}

	public	void	clear() {	
		gList.clear();
		curNumber = 0;
	}

	public	void	draw(Graphics g) {
		for(int i=0; i<curNumber; ++i)
			((Graphic)gList.get(i)).draw(g);
	}
} 

/**
 * AShape is the base class of leaves: Line, Rect, FillRect, Oval, FilOval
 *
 * Every shape is built by two steps: setFirstPoint, setSecondPoint,
 * which will be called by Tool,a builder pattern
 */
abstract class AShape extends Graphic implements Cloneable 
{
	protected	int x1, y1, x2, y2;
	protected	Color	c = null;

	public	AShape() {c = Color.black;} 
	public	AShape(Color c) {this.c = c;} 

	public	void	setColor(Color c) {this.c = c;}
	public	Color	getColor() {return c;}

	public	void	setFirstPoint(int x, int y) {
		x2=x1 = x; y2=y1 =y;
	}
	public	void	setSecondPoint(int x, int y) {
		x2 = x; y2 =y;
	}

	public Object clone() {
		Object obj = null;
		try{
				obj = super.clone();
			} catch (CloneNotSupportedException e) {}
		return obj;
	}
}

/**
 * The following classes are different just in the draw operation
 */
 
class Line extends AShape
{
	public	Line() {} 
	public	Line(Color c) {super(c);} 

	public	void	draw(Graphics g) {
		g.setColor(c);
		g.drawLine(x1, y1, x2, y2);
	}
}

class Rect extends AShape
{
	public	Rect() {} 
	public	Rect(Color c) {super(c);} 

	public	void	draw(Graphics g) {
		g.setColor(c);
		g.drawRect(x2>x1?x1:x2, y2>y1?y1:y2, Math.abs(x2-x1)+1, Math.abs(y2-y1)+1);
	}
}
class FillRect extends AShape
{
	public	FillRect() {} 
	public	FillRect(Color c) {super(c);} 

	public	void	draw(Graphics g) {
		g.setColor(c);
		g.fillRect(x2>x1?x1:x2, y2>y1?y1:y2, Math.abs(x2-x1)+1, Math.abs(y2-y1)+1);
	}
}

class Oval extends AShape
{
	public	Oval() {} 
	public	Oval(Color c) {super(c);} 

	public	void	draw(Graphics g) {
		g.setColor(c);
		g.drawOval(x2>x1?x1:x2, y2>y1?y1:y2, Math.abs(x2-x1)+1, Math.abs(y2-y1)+1);
	}
}
class FillOval extends AShape
{
	public	FillOval() {} 
	public	FillOval(Color c) {super(c);} 

	public	void	draw(Graphics g) {
		g.setColor(c);
		g.fillOval(x2>x1?x1:x2, y2>y1?y1:y2, Math.abs(x2-x1)+1, Math.abs(y2-y1)+1);
	}
}