import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

import javax.vecmath.*;

public class Device extends JComponent implements WireMesh {
	private int width;
	private int height;
	private float scale;

	private Vector3f viewPosition = new Vector3f ( 5, 5, 5 );
	private Vector3f viewNormal = new Vector3f ( -1, -1, -1);
	private Vector3f viewUp = new Vector3f ( 0, 0, 1);
	private Vector3f up;
	private Vector3f right;
	private float up0;
	private float right0;
	private Graphics g;
	private ParametricCurve model;
	private Vector3f i = new Vector3f ( 1, 0, 0 );
	private Vector3f j = new Vector3f ( 0, 1, 0 );
	private Vector3f k = new Vector3f ( 0, 0, 2 );
	private Vector3f zero = new Vector3f ( 0, 0, 0 );
	private boolean debug = false;

	public Device ( int h, int w, float s ){
		width = w;
		height = h;
		scale = s;
		fixView();
	}

	public Device ( int h, int w ) {
		this ( h, w, 1.0f );
	}

	public Device() {
		this ( 550, 850 );
	}

	private void fixView() {
		viewNormal.normalize();
		up = new Vector3f(viewUp);
		up.scaleAdd ( - up.dot( viewNormal), viewNormal, up );
		up.normalize();
		right = new Vector3f();
		right.cross ( viewNormal, up );
		right0 = right.dot ( viewPosition );
		up0 = up.dot ( viewPosition );
	}

	public void devLine ( float x1, float y1, float x2, float y2 ) {
		g.drawLine ( (int) (x1*scale + width/2.0),
			(int) (-y1*scale + height/2.0),
			(int) (x2*scale + width/2.0),
			(int) (-y2*scale + height/2.0) );

		if ( debug ) {
			System.out.println  ( (int) (x1*scale + width/2.0) + " " 
				+ (int) (-y1*scale + height/2.0) + " " 
				+ (int) (x2*scale + width/2.0) + " " 
				+ (int) (-y2*scale + height/2.0) );
			
		}
	}

	public Vector2f worldToView ( Vector3f v1 ) {
		return new Vector2f ( v1.dot ( right ) - right0,
			v1.dot ( up ) - up0 );
	}

	public Vector3f modelToWorld ( Vector3f v1 ) {
		return v1;
	}

	public Dimension getSize() {
		return new Dimension ( width, height );
	}

	public void lineVector3f ( Vector3f a, Vector3f b ) {
		Vector2f v1 = worldToView ( modelToWorld ( a ) );
		Vector2f v2 = worldToView ( modelToWorld ( b ) );
		devLine ( v1.x, v1.y, v2.x, v2.y );
	}

	public void paint ( Graphics gIn ) {
		g = gIn;
		g.setColor ( Color.black );
		model.draw(this);
		//debug = true;
		//System.out.println ( "New Paint" );
		g.setColor ( Color.blue );
		lineVector3f ( zero, i );
		lineVector3f ( zero, j );
		lineVector3f ( zero, k );
		//debug = false;
	}

	public void setModel ( ParametricCurve m ) {
		model = m;
	}

	public static void main ( String[] args ) {
		try {
			UIManager.setLookAndFeel (
				UIManager.getCrossPlatformLookAndFeelClassName() );
		} catch ( Exception exc ) {
			System.out.println ( "Error loading L&F: " + exc );
		}

		WindowListener l = new WindowAdapter() {
			public void windowClosing(WindowEvent e) { System.exit(0); }
		};

		JFrame frame = new JFrame ( "Sci Vis" );
		frame.addWindowListener(l);

		Function3f fun = new Helix(1, 1);
		ParametricCurve p = new ParametricCurve ( 0, 3, 0.25f, fun );

		Device d = new Device( 600, 600, 100);
		d.setModel ( p );
		frame.getContentPane().add(d, BorderLayout.CENTER);
		frame.setSize ( d.getSize() );
		frame.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
		frame.show();

		frame.validate();
		frame.repaint();
		d.requestDefaultFocus();
	}
}