// MoveCmd.java
// Command class to perform a move command.

// Written by THC for CS 5 HW 3.  
// Modified by Scot Drysdale for VoronoiTool on 5/17/06

import java.awt.*;

public class MoveCmd extends Command
{
	private Point lastPoint;    // the mouse position last time
	private Shape s;            // which Shape is being moved

	// When the mouse is pressed, find the closest close Shape in the drawing
	// to the mouse position.  If there is such a Shape, then
	// remember the Shape and the mouse position.
  public void executePress(Point p, Drawing dwg)
  {
    s = dwg.getCloseShape(p); 			// find close Shape to p
    if (s != null)                    // was there a Shape containing p?
      lastPoint = p;                  // yes, remember where p is
  }
  
  // When the mouse is dragged, if we had found a Shape when the mouse was
  // pressed, move the Shape by the difference between the current position of
  // the mouse and where it was last time.  Then update so that the current mouse
  // position will be remembered for next time.
  public void executeDrag(Point p, Drawing dwg)
  {
    if (s != null)              // did we find a Shape when the mouse was pressed?
    {
      s.move(p.x - lastPoint.x, p.y - lastPoint.y, lastPoint); // yes, so move it...
      lastPoint = p;            // ...and remember current mouse position
    }
  }
}