//
//  ShadowView.m
//
//  Created by Andrew Zamler-Carhart on Tue Jul 02 2002.
//  mailto:andrew@zamler-carhart.com
//  Copyright (c) 2002 Andrew Zamler-Carhart.
//
//  Thanks to John C. Randolph and Tom Waters.
//
//  To experiment with the values to showShadowHeight:radius:azimuth:ka,
//  you may wish to try Tom Waters' program TestShadow, available at
//  http://www.whidbeysoft.com/downloads/TestShadow.tar.gz
//

#import <Cocoa/Cocoa.h>

@interface ShadowView : NSView 
{
   void *shadowValues;
}

// This method will enlarge the view's frame by offset in all directions,
// thus preventing the shadow from being clipped by the view's bounding rect.
// The offset variable should be roughly the sum of height and radius passed to the next method.
// Drawing should be offset by this amount. (Perhaps a coordinate transform would be in order?)
- (void) enlargeFrame: (int) offset;

// Causes all drawing to be done using a drop shadow.
// Each call to this method must be followed by a call to hideShadow.
- (void) showShadowHeight: (int) height // the offset of the drop shadow from what is drawn
  radius: (int) radius // how much the shadow is blurred
 azimuth: (int) azimuth // the angle that the light appears to come from
      ka: (float) ka; // 0.0 is a black shadow, 1.0 is no shadow

// Turns off the drop shadow.
// Must be called after calling the above method.
- (void) hideShadow;

@end