/*

 * QuickTime for Java SDK Sample Code

   Usage subject to restrictions in SDK License Agreement

 * Copyright: © 1996-1999 Apple Computer, Inc.

 */

package ds.actions;

import quicktime.app.actions.*;

import quicktime.qd.*;

import quicktime.*;

import quicktime.std.image.Matrix;

import quicktime.app.image.Transformable;

import quicktime.app.display.Drawable;

import java.awt.Dimension;

import java.awt.event.MouseEvent;

/**

 * A class that provides the implementation of where a dragged object will be scaled according

 * to the amount of pixels from the origin the user drags the mouse.

 */

public class Scaler extends Dragger {

//____________________________ CLASS METHODS

    /**

     * Set some parameters that will create DragActions. 

     * @param modifierKeyMask - if specified will determine which modifier keys must

     * be depressed for the action to be invoked.

     */

    public Scaler (int scaleFactor, int modifierKeyMask) {

        this (scaleFactor, modifierKeyMask, MouseResponder.kModifiersExactMatch, 0);

    }

    /**

     * Set some parameters that will create DragActions. 

     * @param modifierKeyMask - if specified will determine which modifier keys must

     * be depressed for the action to be invoked.

     * @param modifierTestConditions the test conditions under which the modifier mask is tested

     */

    public Scaler (int scaleFactor, int modifierKeyMask, int modifierTestConditions, int addedEventInvoker) {

        super (modifierKeyMask, modifierTestConditions, addedEventInvoker);

        this.scaleFactor = scaleFactor;

    }   

//____________________________ INSTANCE VARIABLES

    private int xOrigin, yOrigin;   

    private int scaleFactor;

//____________________________ INSTANCE METHODS

    /**

     * This method is used by the DragController when the mouse is first pressed down on 

     * the draggable object. If you wish to do anything to your draggable object before it

     * is dragged then you should overide this method. The default implementation does nothing.

     * @param event the mouse down event that may begin the drag action

     * @param space The drawable object is the space within which the event has occured.

     */

    public void mousePressed (MouseEvent event) {

        xOrigin = event.getX();

        yOrigin = event.getY();

    }

    /**

     * This method is called by Dragger when an event is received that meets the conditions for 

     * the object to be dragged.

     * <P>

     * This method will allow the user to alter the size of the object by dragging on it.

     * @param event the mouse drag event that triggered the drag action.

     * @param space The drawable object is the space within which the event has occured.

     */

    public void mouseDragged (MouseEvent event) {

        try {

            Matrix mat = target.getMatrix();

            float x = (event.getX() - xOrigin) / (float)scaleFactor;

            float y = (event.getY() - yOrigin) / (float)scaleFactor;

            xOrigin = event.getX();

            yOrigin = event.getY();

            mat.setSx (mat.getSx() + x);

            mat.setSy (mat.getSy() + y);

            target.setMatrix (mat);

        } catch (QTException e) {

            throw new QTRuntimeException (e);

        }

    }

}