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/* This code is based on Apple's "GeekGameBoard" sample code, version 1.0.
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http://developer.apple.com/samplecode/GeekGameBoard/
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Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted
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provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list of conditions
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and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this list of
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conditions and the following disclaimer in the documentation and/or other materials provided
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with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
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BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#import "Piece.h"
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#import "QuartzUtils.h"
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@implementation Piece
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- (id) initWithImageNamed: (NSString*)imageName
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scale: (CGFloat)scale
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{
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self = [super init];
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if (self != nil) {
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self.imageName = imageName;
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[self setImage: GetCGImageNamed(imageName) scale: scale];
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self.zPosition = kPieceZ;
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}
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return self;
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}
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- (id) copyWithZone: (NSZone*)zone
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{
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Piece *clone = [super copyWithZone: zone];
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clone.imageName = self.imageName;
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return clone;
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}
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- (void) dealloc
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{
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[_imageName release];
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[super dealloc];
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}
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- (NSString*) description
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{
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return [NSString stringWithFormat: @"%@[%@]",
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[self class],
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_imageName.lastPathComponent.stringByDeletingPathExtension];
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}
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@synthesize imageName=_imageName;
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- (void) setImage: (CGImageRef)image scale: (CGFloat)scale
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{
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self.contents = (id) image;
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self.contentsGravity = @"resize";
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self.minificationFilter = kCAFilterLinear;
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int width = CGImageGetWidth(image), height = CGImageGetHeight(image);
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if( scale > 0 ) {
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if( scale >= 4.0 )
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scale /= MAX(width,height); // interpret scale as target dimensions
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width = ceil( width * scale);
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height= ceil( height* scale);
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}
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self.bounds = CGRectMake(0,0,width,height);
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self.imageName = nil;
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}
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- (void) setImage: (CGImageRef)image
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{
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CGSize size = self.bounds.size;
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[self setImage: image scale: MAX(size.width,size.height)];
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}
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- (void) setImageNamed: (NSString*)name
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{
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[self setImage: GetCGImageNamed(name)];
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self.imageName = name;
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}
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- (BOOL)containsPoint:(CGPoint)p
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{
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// Overrides CGLayer's implementation,
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// returning YES only for pixels at which this layer's alpha is at least 0.5.
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// This takes into account the opacity, bg color, and background image's alpha channel.
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if( ! [super containsPoint: p] )
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return NO;
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float opacity = self.opacity;
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if( opacity < 0.5 )
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return NO;
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float thresholdAlpha = 0.5 / self.opacity;
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CGColorRef bg = self.backgroundColor;
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float alpha = bg ?CGColorGetAlpha(bg) :0.0;
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if( alpha < thresholdAlpha ) {
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CGImageRef image = (CGImageRef)self.contents;
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if( image ) {
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// Note: This makes the convenient assumption that the image entirely fills the bounds.
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alpha = MAX(alpha, GetPixelAlpha(image, self.bounds.size, p));
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}
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}
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return alpha >= thresholdAlpha;
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}
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@end
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