// DeleteAreaCmd.java

// Deletes all shapes lying entirely in a dragged rectangle.
// by Scot Drysdale on 7/12/06

import java.awt.Color;
import java.awt.Point;

public class DeleteAreaCmd extends Command {
	private Point firstPoint = null;       // starting corner for the Rect
	private Rect currentRect;
	  
	// When the mouse is clicked, remember its position, create a new Rect with
	// the mouse position as its upper left and zero width and height, and make
	// the rect the temporary shape.  The next time clicked, delete all shapes
	// contained in the rectangle.
	public void executeClick(Point p, Drawing dwg)
	{		
		if(firstPoint == null)
		{
			firstPoint = p;
			currentRect = new Rect(p.x, p.y, 0, 0, Color.blue);
			dwg.setTempShape(currentRect);
		}
		else  // Second click, so time to remove things in rectangle
		{
			dwg.removeInRect(currentRect);
			firstPoint = null;
			dwg.setTempShape(null);
		}
	}
	  
	// When the mouse is moved, make a new Rect with the original press position
	// as one corner and the current mouse position as the opposite corner,
	// and have this new Rect replace the current one
	public void executeMove(Point p, Drawing dwg)
	{
	    currentRect = new Rect(Math.min(p.x, firstPoint.x), Math.min(p.y, firstPoint.y),
	                      Math.abs(p.x - firstPoint.x), Math.abs(p.y - firstPoint.y),
	                      Color.blue);
	    dwg.setTempShape(currentRect);
	  }
}