package mygraphs;

import java.awt.*;
import javax.swing.*;
import java.util.Vector;
import java.util.Enumeration;
import parameters.ParameterSet;
import parameters.Parameter;

class CamGraphCanvas extends JComponent {
	Vector		paramSets = new Vector();
	ParameterSet	prototype;
	boolean	offScrUpToDate = false;
	Image		offScrImage = null;
	double	[]	cosThetas;
	double	[]	sinThetas;
	double		minPlotScore = 0.2;

	CamGraphCanvas() { setParameters(null); }
	
	CamGraphCanvas(ParameterSet params) {
		setParameters(params);
	}
	
	public void setParameters(ParameterSet params) {
		prototype = params;
		if(prototype == null) return;		// Will be set later presumably
		cosThetas = new double[prototype.numParams];
		sinThetas = new double[prototype.numParams];
		for(int i = 0; i < prototype.numParams; i++) {
			double theta = 2.0*3.14159*i/(double) prototype.numParams;
			cosThetas[i] = Math.cos(theta);
			sinThetas[i] = Math.sin(theta);
		}
	}

	public void addPoint(ParameterSet params) {
		paramSets.addElement(params);
		offScrUpToDate = false;
	}

	public void removePoint(ParameterSet params) {
		paramSets.removeElement(params);
		offScrUpToDate = false;
	}

	public void clearPoints() { paramSets.removeAllElements();  offScrUpToDate = false;}

	public void update(Graphics g) { paint(g); }
	
	public void paint(Graphics g) { 
		paintOffScreen();  
		g.drawImage(offScrImage, 0, 0, this); 
	}
	
	public void print(Graphics g) {
		plotGraph(g);
	}
	
	private void paintOffScreen() {
		Rectangle area = getBounds();
		if(offScrImage == null || offScrImage.getWidth(this) != area.width ||
					offScrImage.getHeight(this) != area.height) {
			offScrImage = createImage(area.width, area.height);
			offScrUpToDate = false;
		}
		
		if(offScrUpToDate) return;
		
		Graphics og = offScrImage.getGraphics();
		og.setColor(Color.white);
		og.fillRect(0, 0, area.width, area.height);
		
		plotGraph(og);
		og.dispose();
	}
	
	private void plotGraph(Graphics g) {		
		/* Draw the data */
		Dimension area = getSize();
		Enumeration enum = paramSets.elements();

		g.setColor(Color.black);
		g.drawLine(0,0,area.width-1,0);
		g.drawLine(area.width-1, 0, area.width-1, area.height);
		g.drawLine(area.width-1, area.height, 0, area.height);
		g.drawLine(0, area.height, 0, 0);
		int xcen = (int)(area.width/2);
		int ycen = (int)(area.height/2);
		int rad = xcen;
		if(rad > ycen) rad = ycen;
		rad = (int)(0.8*rad);

		plotGrid(g, xcen, ycen, rad);

		while(enum.hasMoreElements()) {
			ParameterSet set = (ParameterSet)enum.nextElement();
			set.draw(g, xcen, ycen, rad, cosThetas, sinThetas);
		}
		offScrUpToDate = true;
	}

	private void plotGrid(Graphics g, int xcen, int ycen, int rad) {
		g.setColor(Color.lightGray);
		String label;
		int radius=rad;
		int	num_params = prototype.numParams;
		int xto = xcoord(num_params - 1,xcen, radius);
		int yto = ycoord(num_params - 1,ycen, radius);
		int xfrom,yfrom,i;
		for(i = 0; i < num_params; i++) { // draw the outer circle
			xfrom=xto;	yfrom=yto;
			xto=xcoord(i,xcen, radius);
			yto=ycoord(i,ycen, radius);
			g.drawLine(xfrom,yfrom,xto,yto);
		}
		radius = rad/4;
		xto = xcoord(num_params - 1,xcen, radius);
		yto = ycoord(num_params - 1,ycen, radius);
		for(i = 0; i < num_params; i++) { // draw the inner circle
			xfrom=xto;	yfrom=yto;
			xto=xcoord(i,xcen, radius);
			yto=ycoord(i,ycen, radius);
			g.drawLine(xfrom,yfrom,xto,yto);
		}
		radius = (int)(1.06*rad);
		for(i = 0; i < num_params; i++) { // draw the radial rays
			g.drawLine(xcen,ycen,xcoord(i,xcen,radius),ycoord(i,ycen, radius));			
		}

		g.setColor(Color.pink);
		radius = (int )(rad/0.9);
		for(i = 0; i < num_params; i++)  {// write the parameter names
			if(prototype.params[i].variationMode == Parameter.LOGARITHMIC) 
				label="ln ";
			else label="";
			g.drawString((label+prototype.params[i].name),xcoord(i,xcen,radius),ycoord(i,ycen, radius));
		}
	}

	private int xcoord(int i, int xcen, int radius) {
		return ((int )(xcen + radius*cosThetas[i]));
	}
		
	private int ycoord(int i, int ycen, int radius) {
		return ((int )(ycen + radius*sinThetas[i]));
	}
		

}