drawpanel.java

java画图板

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

/**the class used to show the image*/
public class DrawPanel extends JPanel {
	
	/**store each shape*/
	public Vector<ImageInfo> store;
	
	/**the creation function*/
	DrawPanel()
	{
		store = new Vector<ImageInfo>();
	}
	
	/**add a pencial path*/
	public void add(GeneralPath g, Color c, Integer t)
	{
		store.add(new ImageInfo(g, c, t));
	}
	
	/**add a general shape*/
	public void add(Shape s, Color c, Integer f, Integer t)
	{
		store.add(new ImageInfo(s, c, f, t));
	}

	/**add a new Image*/
	public void add(ImageInfo o)
	{
		store.add(o);
	}
	
	/**clear the Image*/
	public void clear()
	{
		store.clear();
	}
	
	/**set the index element*/
	public void setElementAt(int index, Shape s, Color c, Integer f, Integer t)
	{
		store.setElementAt(new ImageInfo(s, c, f, t), index);
	}

	/**set the index element*/
	public void setElementAt(int index, ImageInfo i)
	{
		store.setElementAt(i, index);
	}

	/**remove the index element*/
	public void removeElementAt(int index)
	{
		store.removeElement(index);
	}
	
	/**remove the index element*/
	public void remove(int index)
	{
		store.remove(index);
	}
	
	/**return the index shape*/
	public ImageInfo getObj(int index)
	{
		return store.get(index);
	}
	
	/**return the number of shapes*/
	public int length()
	{
		return (int)(store.size());
	}

	/**return the number of object who is selected*/
	public int check(int x, int y)
	{
		for(int i = 0; i < store.size(); i++)
		{
			if(store.elementAt(i).fill == 0 || store.elementAt(i).fill == 1)
			{
				if(store.elementAt(i).shape.contains(x, y))
					return i;
			}else if(store.elementAt(i).fill == 2){//System.exit(0);
				int x1 = store.elementAt(i).shape.getBounds().x;
				int w = store.elementAt(i).shape.getBounds().width;
				int y1 = store.elementAt(i).shape.getBounds().y;
				int h = store.elementAt(i).shape.getBounds().height;
				if(x >= x1 && x <= x1+w && y >= y1 && y <= y1+h )
					return i;
			}else if(store.elementAt(i).fill == 3){
				int x1 = store.elementAt(i).shape.getBounds().x;
				int w = store.elementAt(i).shape.getBounds().width;
				int y1 = store.elementAt(i).shape.getBounds().y;
				int h = store.elementAt(i).shape.getBounds().height;
				if(x >= x1 && x <= x1+w && y >= y1 && y <= y1+h )
					return i;
			}else if(store.elementAt(i).fill == 4){
				if(x >= store.elementAt(i).x && x <= store.elementAt(i).x+store.elementAt(i).font.getSize()*store.elementAt(i).chat.length()*0.6 && y <= store.elementAt(i).y && y >= store.elementAt(i).y-store.elementAt(i).font.getSize()*0.7)
					return i;
			}
		}
		return -1;
	}
	
	/**the repaint function*/
	public void paintComponent(Graphics g) {
		super.paintComponent(g); //use father class
		Graphics2D g2D = (Graphics2D)g;
		for(int i = 0; i < store.size(); i++)
		{ 
			g2D.setColor(store.elementAt(i).color);		//set color
			if(store.elementAt(i).fill == 0)	//draw or fill
			{
				g2D.setStroke(new BasicStroke(store.elementAt(i).thick, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_ROUND)); //设置新的画刷
				g2D.draw(store.elementAt(i).shape);
			}else if(store.elementAt(i).fill == 1){
				g2D.fill(store.elementAt(i).shape);
			}else if(store.elementAt(i).fill == 2){
				g2D.setStroke(new BasicStroke(store.elementAt(i).thick, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_ROUND)); //设置新的画刷
				g2D.draw(store.elementAt(i).shape);
			}else if(store.elementAt(i).fill ==3){
				g2D.setStroke(new BasicStroke(store.elementAt(i).thick, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_ROUND)); //设置新的画刷
				g2D.draw(store.elementAt(i).shape);
			}else if(store.elementAt(i).fill == 4){
				g2D.setFont(store.elementAt(i).font);
				g2D.drawString(store.elementAt(i).chat,	store.elementAt(i).x, store.elementAt(i).y);
			}
		}
	}
}