//

//  RGBAppController.m

//  RGB Image

//

//  Created by jcr on Thu Feb 21 2002.

//  Copyright (c) 2002  Apple Computer, Inc. All rights reserved.

static NSString *imageKey = @"image";

static NSString *combinedImageKey = @"combinedImage";

static NSString *showsRedKey = @"showsRed";

static NSString *showsGreenKey = @"showsGreen";

static NSString *showsBlueKey = @"showsBlue";

static NSString *showsAlphaKey = @"showsAlpha";

@implementation RGBAppController

+ (void) initialize

    {

    // ValueTransformers need to be created before the nib loads.

    [NSValueTransformer setValueTransformer:[RGBTransformer transformerWithColor:[NSColor redColor]] forName:@"redTransformer"];

    [NSValueTransformer setValueTransformer:[RGBTransformer transformerWithColor:[NSColor greenColor]] forName:@"greenTransformer"];

    [NSValueTransformer setValueTransformer:[RGBTransformer transformerWithColor:[NSColor blueColor]] forName:@"blueTransformer"];

    [NSValueTransformer setValueTransformer:[RGBTransformer transformerWithColor:[NSColor blackColor] operation:NSCompositeSourceAtop] forName:@"alphaTransformer"];

    // Make sure that anything bound to "combinedImage" updates when the image or the checkboxes are changed.

    [self setKeys:[NSArray arrayWithObjects: imageKey, showsRedKey, showsGreenKey, showsBlueKey, showsAlphaKey, nil] triggerChangeNotificationsForDependentKey:combinedImageKey];

    }

- (void) awakeFromNib // Set all these values with key-value coding, so that the checkboxes notice the change.

    {

    [self setValue:[NSNumber numberWithBool:YES] forKey:showsRedKey];

    [self setValue:[NSNumber numberWithBool:YES] forKey:showsGreenKey];

    [self setValue:[NSNumber numberWithBool:YES] forKey:showsBlueKey];

    [self setValue:[NSNumber numberWithBool:YES] forKey:showsAlphaKey];

    }

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification

    {

    [self showTheMandrill:nil];  // Just so that we're not looking at a blank when we start.

    }

- (IBAction) showTheMandrill:sender  // Load up a test image.

    {

    [self setValue:[NSImage imageNamed:@"mandrill"] forKey:imageKey];

    }

- (IBAction)imageChanged:(id)sender

    {

    [self setValue:[sender image] forKey:imageKey];  // Again, using KVC ensures that the observers notice.

    [[sender cell] setHighlighted:NO];

    }

- (NSImage *) image { return image; }

- (void) setImage:(NSImage *) anImage  // Standard paranoid accessor method.

    {

    if (anImage != image)

      {

        [anImage retain]; 

        [image release];

        image = anImage;

        }

    }

- (NSImage *) RGBImage  // image consisting of the selected components, not including alpha.

    {

    NSImage 

        *rgbImage = [[[NSImage alloc] initWithSize:[image size]] autorelease];

  [rgbImage lockFocus];

        if (showsRed)   

            [[image transformedValueWithTransformer:[NSValueTransformer valueTransformerForName:@"redTransformer"]] 

            compositeToPoint:NSZeroPoint operation:NSCompositePlusLighter];

        if (showsGreen)     

            [[image transformedValueWithTransformer:[NSValueTransformer valueTransformerForName:@"greenTransformer"]] 

                compositeToPoint:NSZeroPoint operation:NSCompositePlusLighter];

        if (showsBlue)  

            [[image transformedValueWithTransformer:[NSValueTransformer valueTransformerForName:@"blueTransformer"]] 

            compositeToPoint:NSZeroPoint operation:NSCompositePlusLighter];

    [rgbImage unlockFocus];

    return rgbImage;

    }

- (NSImage *) combinedImage  // Reconstitute the image from the selected components

    {

    if (image) // Must have an image to have a combinedImage.

        {

        NSSize 

            imageSize = [image size];

        NSImage 

            *newImage = [[NSImage alloc] initWithSize:imageSize];

        NSRect 

            imageRect = NSMakeRect(0, 0, imageSize.width, imageSize.height);

        [newImage lockFocus];

            if (showsAlpha)  

                {

                [[NSColor clearColor] set];

                NSRectFill(imageRect);

                [[[NSValueTransformer valueTransformerForName:@"alphaTransformer"] transformedValue:image] 

                    compositeToPoint:NSZeroPoint operation:NSCompositeCopy];

                }

            else  // Not using alpha, so give something to draw the RGB image over.

                {

                [[NSColor whiteColor] set];

                NSRectFill(imageRect);

                }

            [[self RGBImage] compositeToPoint:NSZeroPoint operation:NSCompositeSourceAtop];

        [newImage unlockFocus];

        return [newImage autorelease];

        }

    return nil;

    }

- (void) setCombinedImage:(NSImage *) anImage {}  // This is just here so that key-value coding won't complain.

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication { return YES; }

@end

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