// AdjustablePlot2D.java
//

import java.awt.*;

public class AdjustablePlot2D extends Plot2D {
	private Button add_point_button;
	private boolean adding_a_point=false;
	private int dragging_a_point=-1; // number of point you are dragging
	private int near_a_point=-1;	// number of point your near
	private Point new_point=null;

	public boolean mouseDown(Event event,int x,int y) {
		if(near_a_point!=-1) {
			dragging_a_point=near_a_point;
		}

		return(true);
	}

	public boolean mouseDrag(Event event,int x,int y) {
		Point2D p2d;
		Point p;
		DataSet2D ds;

		if(dragging_a_point>-1) {
			ds=(DataSet2D) data_sets.elementAt(0);
			p=new Point(x,y);
			p2d=ConvertPoint(p);
			try {
				if(ds.GetSortOrder()==DataSet2D.SORT_X) {
					ds.GetElement(dragging_a_point).y=p2d.y;
				} else if(ds.GetSortOrder()==DataSet2D.SORT_Y) {
					ds.GetElement(dragging_a_point).x=p2d.x;
				} else {
					ds.GetElement(dragging_a_point).x=p2d.x;
					ds.GetElement(dragging_a_point).y=p2d.y;
				}
			}
			catch (DataSet.DataException e) {
				System.out.println(e.toString());
			}
			repaint();
		}
		return(true);
	}

	public boolean mouseMove(Event event,int x,int y) {
		int i;
		DataSet2D ds;
		Point p;
		double dist_sqr,min_dist_sqr=0;
		int old_point;

		// Check to see if we are near a point to adjust.
		old_point=near_a_point;
		ds=(DataSet2D) data_sets.elementAt(0);
		for(i=0; i<ds.GetNumDataPoints(); i++) {
			try {
				p=ConvertPoint(ds.GetElement(i));
				dist_sqr=(p.x-x)*(p.x-x)+(p.y-y)*(p.y-y);
				if((i==0) || (dist_sqr<min_dist_sqr)) {
					min_dist_sqr=dist_sqr;
					near_a_point=i;
				}
			}
			catch (DataSet.DataException e) {
				System.out.println(e.toString());
			}
		}
		if(min_dist_sqr>100) {
			near_a_point=-1;
		}
		if(near_a_point!=old_point) {
			repaint();
		}

		return(true);
	}

	public boolean mouseUp(Event event,int x,int y) {
		dragging_a_point=-1;
		return(true);
	}

	public boolean action(Event event,Object arg) {
		if(event.target==add_point_button) {
		} else super.action(event,arg);
		return(true);
	}

	public void paint(Graphics g) {
		super.paint(g);

		// Draw other stuff to indicate what point is being adjusted
		if(near_a_point>-1) {
			DataSet2D ds;
			Point p;

			ds=(DataSet2D) data_sets.elementAt(0);
			try {
				p=ConvertPoint(ds.GetElement(near_a_point));
				g.setColor(Color.magenta);
				g.fillOval(p.x-2,p.y-2,5,5);
			}
			catch (DataSet.DataException e) {
				System.out.println(e.toString());
				return;
			}
		}
	}
}