xygrapher

import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public abstract class XYGrapher extends Frame implements WindowListener{
	private int xpixelStart;
	private int ypixelStart;
	private int pixelshigh;
	private int pixelswide;
	abstract protected Coordinate xyStart(); // Where the graph will start (LLC)
	abstract protected double xRange(); // Width + height of graphing area
	abstract protected double yRange();
	abstract protected Coordinate getPoint(int pointNum);
	
	public void init(){
		this.setVisible(true);
	}
	
	public void windowClosed(WindowEvent e){
		//System.exit(0);
	}
	
	public void windowClosing(WindowEvent e){
		//System.exit(0);
	}
	
	public void drawGraph(int xPixelStart, 
			int yPixelStart, int pixelsWide, 
			int pixelsHigh){
		/*xpixelStart = xPixelStart;
		ypixelStart = yPixelStart;
		pixelswide = pixelsWide;
		pixelshigh = pixelsHigh;
		
		int yPixelStart = ypixelStart;
		int xPixelStart = xpixelStart;
		int pixelsWide = pixelswide;
		int pixelsHigh = pixelshigh;*/
		yPixelStart = yPixelStart + 10;
		this.setSize(pixelsWide + xPixelStart, pixelsHigh+ yPixelStart);
		pixelsWide = pixelsWide + xPixelStart;
		pixelsHigh = pixelsHigh + yPixelStart;
		this.setVisible(true);               // Make a new applet pWxpH
		Coordinate point = getPoint(0);      // Get the first point
		int pointNum = 0;    
		Graphics gr = getGraphics();
		double xRange = xRange();            // Range of x and y on the graph
		double yRange = yRange();
		double xStart = xyStart().getX();    // Starting value of x and y in
		double yStart = xyStart().getY();    // lower left hand corner
		
		gr.setColor(Color.green);
		if((xStart < 0) && (xStart + xRange > 0)){ //Graph the yAxis if possible
			gr.drawLine( // y axis
					getInt(xPixelStart-(xStart*(pixelsWide/xRange))), 
					getInt(yPixelStart - 10),
					getInt(xPixelStart-(xStart*(pixelsWide/xRange))), 
					getInt(yPixelStart + pixelsHigh));
		}
		if((yStart < 0) && (yStart + yRange > 0)){ //Graph the xAxis if possible
			gr.drawLine(
					getInt(xPixelStart),
					getInt(yPixelStart + (yStart+yRange)*(pixelsHigh/yRange)), 
					getInt(xPixelStart + pixelsWide), 
					getInt(yPixelStart + (yStart+yRange)*(pixelsHigh/yRange)));
		}
		gr.setColor(Color.black);
		
		int lastx = 0; // initialize last coordinates
		int lasty = 0;
		
		while(point != null){               // As long as the point exists...
			double X = point.getX();        // X = x coord
			double Y = point.getY();        // Y = y coord
			int xPixel = getInt(            // map x to xPixel
					xPixelStart + (X-xStart)*(pixelsWide/xRange));
			int yPixel = getInt(            // map y to yPixel
					yPixelStart + (yStart+yRange-Y)*(pixelsHigh/yRange));
			//gr.drawLine(xPixel,yPixel,xPixel+1,yPixel+1); //Draw the point
			if(pointNum != 0){              // if not first point, draw line
				gr.drawLine(lastx, lasty, xPixel, yPixel); 
			}
						
			pointNum++;   //update pointNum
			point = getPoint(pointNum);
			lastx = xPixel;
			lasty = yPixel;
		}
	}
	private int getInt(double doub){
		int count = 0;
		while(doub > 1){
			count++;
			doub--;
		}
		return count;
	}
}