// CS 134 demo.  Second stage in constructing a program
// to drag a box around on the screen.

import objectdraw.*;
import java.awt.*;

public class MouseDrag extends WindowController {

    // Starting position for box
    private static final int START_LEFT = 200,  
                             START_TOP = 100, 
              
                             // dimensions of the box
                             BOX_HEIGHT = 30,   
                             BOX_WIDTH = 30;
              
    private FilledRect box;  // box to be dragged

    // point where mouse was last seen
    private Location lastPoint;       
    
    // make the box
    public void begin()
    {
        box = new FilledRect(START_LEFT, START_TOP,
                             BOX_WIDTH, BOX_HEIGHT,
                             canvas);
    }
    
    // Save starting point 
    public void onMousePress(Location point)
    {
        lastPoint = point;
    }
    
    // if mouse is in box, then drag the box
    public void onMouseDrag(Location point)
    {
        if ( box.contains( lastPoint) )
        {
            box.move( point.getX() - lastPoint.getX(),
                      point.getY() - lastPoint.getY() );
            lastPoint = point;
        }
    }
    
}