//

//  TransformedImageView.m

//  Transformed Image

//

//  Created by jcr on Thu May 02 2002.

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

//

#import "TransformedImageView.h"

#import "NSViewExtensions.h"

#import "NSAffineTransform_Shearing.h"

@interface TransformedImageView (private)  // Methods that I don't want called from outside this class.

- (void) drawImage;  // This should only get called when there's a valid, locked focus

- (void) setUpClipping;  // Protects the bezel  if there is one.

@end

@implementation TransformedImageView

// This subclass of NSImageView is able to draw its image with a given rotation.

// One deficiency that's left as an exercise for the reader to correct, is that TransformedImageView doesn't add a clipping path to protect the image frame (bezel, drop shadow, etc.) when it's drawn. 

- (id)initWithFrame:(NSRect)frameRect

  {

  if (self = [super initWithFrame:frameRect])

    [self setTransform:[NSAffineTransform transform]];

  return self;

  }

- (void) setTransform:(NSAffineTransform *) aTransform

  {

  [aTransform retain];

  [transform release];

  transform = aTransform;

  [self setNeedsDisplay:YES];

  }

- (void)drawRect:(NSRect)rect

  {

  NSCell 

    *cell = [self cell];

  NSImage 

    *myImage = [self image];  // Need to stash this for a moment..

  [cell setImage:nil];

  [super drawRect:rect];  // This gets us an empty bezel.

  [cell setImage:myImage];  // put the image back in the cell

  [self drawImage];     // and then this fills in the transformed image

  }

- (NSImage *) transformedImage  // provides the image in its transformed state, in case you want to save it.

  {

  NSSize 

    imageSize = [self bounds].size;

  NSImage 

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

  NSGraphicsContext

    *context;

  [newImage lockFocus];  

  context = [NSGraphicsContext currentContext];

        // Must use the CG call here because I'm not drawing in an NSView.

  CGContextTranslateCTM([context graphicsPort], imageSize.width/2, imageSize.height/2); // Move the origin to the center.

  [self drawImage];   

  [newImage unlockFocus];  

  return [newImage autorelease]; 

  }

  // Simple accessor

- (NSAffineTransform *) transform  {  return transform; }

  // And just one IBAction.

- (IBAction) takeFrameStyleFrom: sender

  {

  [self setImageFrameStyle:[[sender selectedCell] tag]];

  [self setNeedsDisplay:YES];

  }

@end

@implementation TransformedImageView (private)

- (void) drawImage  // this should only get called when there's a valid, locked focus

  {

  NSImage 

    *myImage = [super image];

  NSRect 

    sourceRect, destinationRect;

  [self setUpClipping];

  [self centerOriginInBounds];  // see NSViewExtensions

  sourceRect.origin = NSZeroPoint; 

  sourceRect.size = [myImage size];

  destinationRect = 

    [self centerRect:sourceRect onPoint:NSZeroPoint];  // The result of this, is that destinationRect ends up centered in the view.

  [transform concat];

  [myImage drawInRect:destinationRect fromRect:sourceRect operation:NSCompositeSourceOver fraction:1.0];

  }

- (void) setUpClipping

  // Adds a rect to the current clip rect if necessary to protect the bezel.

  {

  if ([NSGraphicsContext currentContextDrawingToScreen])  // Make sure we don't clobber the Bezel.

    {

    switch ([self imageFrameStyle])

      {

      case NSImageFrameNone:  // No frame, no need to add the clipping path.

        break;

      case NSImageFrameGrayBezel: //a gray, concave bezel that makes the image look sunken

        [NSBezierPath clipRect:NSInsetRect([self bounds], 4.0, 4.0)];

        return;

      default:

        NSLog(@"Bad ImageFrameStyle!");

      }

    }

  }

@end

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