ImageView.m
/* |
File: ImageView.m |
Abstract: ImageView.m class implementation |
Version: <1.0> |
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*/ |
#import "ImageDoc.h" |
#import "ImageView.h" |
#import <Quartz/Quartz.h> |
static const float kMargin = 10; |
@implementation ImageView |
- (void) dealloc |
{ |
[[NSNotificationCenter defaultCenter] removeObserver:self]; |
} |
- (id) initWithFrame:(NSRect)frameRect |
{ |
self = [super initWithFrame:frameRect]; |
[[NSNotificationCenter defaultCenter] |
addObserver: self selector: @selector(newScreenProfile:) |
name: NSWindowDidChangeScreenProfileNotification object:nil]; |
return self; |
} |
// This view completely covers its frame rectangle when drawing so return YES. |
// |
- (BOOL) isOpaque |
{ |
return YES; |
} |
// Return a image transformation matrix that will fit the image in the view |
// |
- (CGAffineTransform) imageTransformToFitView |
{ |
CGRect imageRect = {{0,0}, [mImageDoc imageSize]}; |
CGAffineTransform ctm = [mImageDoc imageTransform]; |
CGSize ctmdSize = CGRectApplyAffineTransform(imageRect, ctm).size; |
NSSize destSize = NSInsetRect([self bounds], kMargin, kMargin).size; |
// scale to fit in view rect |
CGFloat scale = MIN(destSize.width/ctmdSize.width, destSize.height/ctmdSize.height); |
ctm = CGAffineTransformConcat(ctm, CGAffineTransformMakeScale(scale,scale)); |
return ctm; |
} |
- (void) drawImage |
{ |
NSRect viewBounds = [self bounds]; |
CGRect imageRect = {{0,0}, [mImageDoc imageSize]}; |
// get transform matrix to fit image to view |
CGAffineTransform ctm = [self imageTransformToFitView]; |
// center in view rect |
CGSize ctmdSize = CGRectApplyAffineTransform(imageRect, ctm).size; |
ctm.tx += viewBounds.origin.x + (viewBounds.size.width - ctmdSize.width)/2; |
ctm.ty += viewBounds.origin.y + (viewBounds.size.height - ctmdSize.height)/2; |
CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort]; |
if (context==nil) |
return; |
// Concatenate the current graphics state's transformation matrix (the CTM) |
// with the affine transform `ctm' |
CGContextConcatCTM(context, ctm); |
// use low quality interpolation while live resizing |
CGInterpolationQuality q = [self inLiveResize] ? NSImageInterpolationNone : NSImageInterpolationHigh; |
CGContextSetInterpolationQuality(context, q); |
// now draw using updated transform |
[mImageDoc drawImage:context imageRect:imageRect]; |
} |
- (void) drawCIImage |
{ |
CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort]; |
if (context==nil) |
return; |
// scale to fit in view rect |
CIImage* image = [mImageDoc currentCIImageWithTransform:[self imageTransformToFitView]]; |
if (image==nil) |
return; |
// center in view rect |
NSRect viewBounds = [self bounds]; |
CGRect sRect = [image extent]; |
CGRect dRect = sRect; |
dRect.origin.x = viewBounds.origin.x + (viewBounds.size.width - sRect.size.width)/2; |
dRect.origin.y = viewBounds.origin.y + (viewBounds.size.height - sRect.size.height)/2; |
CIContext* ciContext = [CIContext contextWithCGContext:context options:nil]; |
[ciContext drawImage:image inRect:dRect fromRect:sRect]; |
} |
- (void) drawRect:(NSRect)rect |
{ |
// drawBackground |
[[NSColor colorWithCalibratedRed:0.75 green:0.75 blue:0.75 alpha:1.0] set]; |
[NSBezierPath fillRect:[self bounds]]; |
if ([mImageDoc switchState]) |
[self drawCIImage]; |
else |
[self drawImage]; |
} |
// Force a high quality update after live resizing |
- (void) viewDidEndLiveResize |
{ |
if ([mImageDoc switchState]==NO) |
[self setNeedsDisplay:YES]; |
} |
- (void) newScreenProfile:(NSNotification*)n |
{ |
} |
@end |
Copyright © 2012 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2012-06-20