bar.java

自己写的轮询提问的小程序 新手刚学 多多指教 合乎哈

/*
Bar is just a simple bar as in bar graph.
Copyright (C) 2005-2006  Igor Partola, Michael J. Krikonis, Clark University

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

package SharedClasses;

import java.beans.*;
import java.io.Serializable;
import java.awt.*;
import javax.swing.*;
import java.awt.font.*;
import java.awt.geom.*;

public class Bar extends JComponent implements Serializable {
    private int VoteCount = 0;
    private int GreatestVote = 0;
    private int TotalVoteCount = 0;
    private Color BarColor = Color.RED;
    private String Name = "";
    private boolean DisplayPercentage = false;
    
    private int X = 0;
    private int Y = 0;
    private int Width = 0;
    private int MaxHeight = 0;
    
    private Font TextFont = new Font("Tahoma", Font.PLAIN, 11);
    
    public Bar() {
        this(Color.RED, "");
    }
    
    public Bar(Color c, String s) {
        super();
        BarColor = c;
        Name = s;
        setBounds(X, Y, 50, 60);

        repaint();
    }
    
    public void setFont(Font f) {
        TextFont = f;
        repaint();
    }
    
    public void paint(Graphics g) {
        super.paint(g);
        int Height = 0;
        int p = 0;
        
        g.setFont(TextFont);
        
        if (GreatestVote > 0) Height = MaxHeight * VoteCount / GreatestVote;
        
        g.setColor(BarColor);
        g.fillRect(X, Y - Height, Width, Height + 1);
        
        g.setColor(Color.BLACK);
        
        g.drawRect(0, 0, this.getSize().width - 1, this.getSize().height - 1);
        
        if (!DisplayPercentage) 
            paintHorizontallyCenteredText((Graphics2D) g, Integer.toString(VoteCount), X + 24*Width/50, Y - Height - 5);            
        else {
            if (TotalVoteCount == 0) p = 0;
            else p = (int) (100*VoteCount/TotalVoteCount);

            paintHorizontallyCenteredText((Graphics2D) g, Integer.toString(p) + "%", X + 24*Width/50, Y - Height - 5);
        }
        paintHorizontallyCenteredText((Graphics2D) g, Name, X + 25*Width/50, Y + 25);
    }
    
    public void setBounds(int x, int y, int width, int height) {
        int w = width;
        int h = height;
        
        if (width < 20) w = 20;
        if (height < 60) h = 60;
        
        super.setBounds(x, y, w, h);
        X = w/10;
        MaxHeight = h - 50;
        Y = h - 30;
        Width = 8*w/10;
        
  
        repaint();
     }
        
    public void setColor(Color c) {
        BarColor = c;
        repaint();
    }
    
    public void setLabel(String s) {
        int i = s.length();
        int numOfLetters = Width/7;
        if (i > numOfLetters) i = numOfLetters;

        Name = s.substring(0, i);
        repaint();
    }
    
    public void setVoteCount(int v, int gv, int tvc) {
        VoteCount = v;
        GreatestVote = gv;
        TotalVoteCount = tvc;
        repaint();
    }
    
    public void setDisplayPercentage(boolean b) {
        DisplayPercentage = b;
        repaint();
    }
    
    private void paintHorizontallyCenteredText(Graphics2D g2, String s, float centerX, float baselineY) {
        FontRenderContext frc = g2.getFontRenderContext();
        Rectangle2D bounds = g2.getFont().getStringBounds(s, frc);
        float width = (float) bounds.getWidth();
        g2.drawString(s, centerX - width / 2, baselineY);
    }

}