//
//  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.
//

#import "ShadowView.h"

@implementation ShadowView

- (void) enlargeFrame: (int) offset 
{
    NSRect newFrame = NSMakeRect([self frame].origin.x - offset, 
        [self frame].origin.y - offset,
        [self frame].size.width + 2 * offset,
        [self frame].size.height + 2 * offset);
   [self setFrame: newFrame];
   [self setNeedsDisplay: YES];
}

- (void) showShadowHeight: (int) height
  radius: (int) radius
 azimuth: (int) azimuth
      ka: (float) ka
{
   extern void *CGSReadObjectFromCString(char*);
   extern char *CGSUniqueCString(char*);
   extern void *CGSSetGStateAttribute(void*,char*,void*);
   void *graphicsPort;
   NSString *shadowValuesString = [NSString stringWithFormat:
        @"{ Style = Shadow; Height = %d; Radius = %d; Azimuth = %d; Ka = %f; }",
        height, radius, azimuth, ka];

   [NSGraphicsContext saveGraphicsState];
   shadowValues = CGSReadObjectFromCString((char *) [shadowValuesString cString]);
   graphicsPort = [[NSGraphicsContext currentContext] graphicsPort];
   CGSSetGStateAttribute(graphicsPort, CGSUniqueCString("Style"), shadowValues);
}

- (void) hideShadow 
{
   extern void *CGSReleaseGenericObj(void*);
   [NSGraphicsContext restoreGraphicsState];
   CGSReleaseGenericObj(shadowValues);
}

@end