gauge.java.svn-base

這是一個JAVA語言寫的多代理人程式用來模擬飛機起飛或是降落的程式

package gui;

import java.awt.Graphics;
import java.awt.Font;
import java.awt.Color;
import java.util.*;
import javax.swing.*;

public class Gauge extends JPanel
{
	private final int NUMBER_OF_TICKS = 10;
	private final int TEXT_OFFSET_X = -7;
	private final int TEXT_OFFSET_Y = 5;
	private final double TEXT_POSITION = .7; //how far in the gauge the text labels are as a percentage of the radius
	private String title;
	private int radius;
	private double minimum;
	private double maximum;
	private double radiansNotUsed;
	private double orientation;    //where in radians is the bottom
	private double value;
	private int xOffset;
	private int yOffset;

	private int centerX;
	private int centerY;
	private double zero;           //in radians

	public Gauge( String titleTemp, int radiusTemp, double minimumTemp, double maximumTemp, double radiansNotUsedTemp, double orientationTemp, int xOffsetTemp, int yOffsetTemp, double startValue )
	{
		title = titleTemp;
		radius = radiusTemp;
		minimum = minimumTemp;
		maximum = maximumTemp;
		radiansNotUsed = radiansNotUsedTemp;
		orientation = orientationTemp;
		xOffset = xOffsetTemp;
		yOffset = yOffsetTemp;
		value = startValue;

		centerX = xOffset + radius;
		centerY = yOffset + radius;
		zero = orientation - radiansNotUsed / 2;

		setBackground( Color.BLACK );
	}

	public void setValue( double valueTemp )
	{
		value = valueTemp;
		repaint();
	}

	protected void paintComponent( Graphics g )
	{
		super.paintComponent( g );
		g.setColor( Color.WHITE );

		double radianValue = zero - ( ( 2.0 * Math.PI - radiansNotUsed ) * value / ( maximum - minimum ) );
		g.fillOval( xOffset, yOffset, 2 * radius, 2 * radius );
		g.setColor( Color.BLACK );
		g.setFont( new Font( "Helvetica", Font.PLAIN, 10 ) );
		for( int i = 0; i <= NUMBER_OF_TICKS; i++ )
		{
			g.drawLine( (int) ( centerX + .9 * radius * Math.cos( zero - i * ( 2.0 * Math.PI - radiansNotUsed ) / NUMBER_OF_TICKS ) ), (int) ( centerY - .9 * radius * Math.sin( zero - i * ( 2.0 * Math.PI - radiansNotUsed ) / NUMBER_OF_TICKS ) ), (int) ( centerX + radius * Math.cos( zero - i * ( 2.0 * Math.PI - radiansNotUsed ) / NUMBER_OF_TICKS ) ), (int) ( centerY - radius * Math.sin( zero - i * ( 2.0 * Math.PI - radiansNotUsed ) / NUMBER_OF_TICKS ) ) ); 
			g.drawString( Integer.toString( (int) ( minimum + ( ( maximum - minimum ) * i / NUMBER_OF_TICKS ) ) ), TEXT_OFFSET_X + (int) ( centerX + TEXT_POSITION * radius * Math.cos( zero - i * ( 2.0 * Math.PI - radiansNotUsed ) / NUMBER_OF_TICKS ) ), TEXT_OFFSET_Y + (int) ( centerY - TEXT_POSITION * radius * Math.sin( zero - i * ( 2.0 * Math.PI - radiansNotUsed ) / NUMBER_OF_TICKS ) ) );
		}
		g.drawLine( centerX, centerY, (int) ( centerX + radius * Math.cos( radianValue ) ), (int) ( centerY - radius * Math.sin( radianValue ) ) );
		g.drawString( title, centerX - 20, centerY - 5 );
	}
}