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

public class NestedSquaresV2Events extends FrameWindowController {
    
    private static final double UPPER_LEFT_X = 10;
    private static final double UPPER_LEFT_Y = 10;
    private static final double SIDE_SIZE = 300;

    private NestedSquaresV2 mySquares;
    
    private Location lastPoint;

    private boolean grabbed = false;

    public void begin() {
        mySquares = new NestedSquaresV2(UPPER_LEFT_X, UPPER_LEFT_Y,
            SIDE_SIZE, canvas);

        System.out.println("There are " + mySquares.countSquares() +
            " squares in this NestedSquares object");
    }

    public void onMousePress(Location point) {
        mySquares.centerOnPoint(point);
        if (mySquares.contains(point)) {
            grabbed = true;
            lastPoint = point;
        }
    }
    
    public void onMouseRelease(Location point) {
        grabbed = false;
    }

    public void onMouseDrag(Location point) {
        if (grabbed) {
            mySquares.move(point.getX() - lastPoint.getX(), 
                point.getY() - lastPoint.getY());
            lastPoint = point;
        }
    }

}