jens@0: /*  This code is based on Apple's "GeekGameBoard" sample code, version 1.0.
jens@0:     http://developer.apple.com/samplecode/GeekGameBoard/
jens@0:     Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.
jens@0: 
jens@0:     Redistribution and use in source and binary forms, with or without modification, are permitted
jens@0:     provided that the following conditions are met:
jens@0: 
jens@0:     * Redistributions of source code must retain the above copyright notice, this list of conditions
jens@0:       and the following disclaimer.
jens@0:     * Redistributions in binary form must reproduce the above copyright notice, this list of
jens@0:       conditions and the following disclaimer in the documentation and/or other materials provided
jens@0:       with the distribution.
jens@0: 
jens@0:     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
jens@0:     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
jens@0:     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
jens@0:     BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
jens@0:     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
jens@0:     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
jens@0:     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
jens@0:     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jens@0: */
jens@0: #import "Piece.h"
jens@0: #import "QuartzUtils.h"
jens@0: 
jens@0: 
jens@0: @implementation Piece
jens@0: 
jens@0: 
jens@0: - (id) initWithImageNamed: (NSString*)imageName
jens@0:                     scale: (CGFloat)scale
jens@0: {
jens@0:     self = [super init];
jens@0:     if (self != nil) {
jens@0:         self.imageName = imageName;
jens@0:         [self setImage: GetCGImageNamed(imageName) scale: scale];
jens@0:         self.zPosition = kPieceZ;
jens@0:     }
jens@0:     return self;
jens@0: }
jens@0: 
jens@0: 
jens@1: - (id) copyWithZone: (NSZone*)zone
jens@0: {
jens@1:     Piece *clone = [super copyWithZone: zone];
jens@1:     clone.imageName = self.imageName;
jens@1:     return clone;
jens@0: }
jens@0: 
jens@0: 
jens@0: - (void) dealloc
jens@0: {
jens@0:     [_imageName release];
jens@0:     [super dealloc];
jens@0: }
jens@0: 
jens@0: 
jens@0: - (NSString*) description
jens@0: {
jens@0:     return [NSString stringWithFormat: @"%@[%@]", 
jens@0:             [self class],
jens@0:             _imageName.lastPathComponent.stringByDeletingPathExtension];
jens@0: }
jens@0: 
jens@0: 
jens@0: @synthesize imageName=_imageName;
jens@0: 
jens@0: 
jens@0: - (void) setImage: (CGImageRef)image scale: (CGFloat)scale
jens@0: {
jens@0:     self.contents = (id) image;
jens@0:     self.contentsGravity = @"resize";
jens@0:     self.minificationFilter = kCAFilterLinear;
jens@0:     int width = CGImageGetWidth(image), height = CGImageGetHeight(image);
jens@0:     if( scale > 0 ) {
jens@0:         if( scale >= 4.0 )
jens@0:             scale /= MAX(width,height);             // interpret scale as target dimensions
jens@0:         width = ceil( width * scale);
jens@0:         height= ceil( height* scale);
jens@0:     }
jens@0:     self.bounds = CGRectMake(0,0,width,height);
jens@0:     self.imageName = nil;
jens@0: }
jens@0: 
jens@0: - (void) setImage: (CGImageRef)image
jens@0: {
jens@0:     CGSize size = self.bounds.size;
jens@0:     [self setImage: image scale: MAX(size.width,size.height)];
jens@0: }
jens@0: 
jens@0: - (void) setImageNamed: (NSString*)name
jens@0: {
jens@0:     [self setImage: GetCGImageNamed(name)];
jens@0:     self.imageName = name;
jens@0: }
jens@0: 
jens@0: 
jens@0: - (BOOL)containsPoint:(CGPoint)p
jens@0: {
jens@0:     // Overrides CGLayer's implementation,
jens@0:     // returning YES only for pixels at which this layer's alpha is at least 0.5.
jens@0:     // This takes into account the opacity, bg color, and background image's alpha channel.
jens@0:     if( ! [super containsPoint: p] )
jens@0:         return NO;
jens@0:     float opacity = self.opacity;
jens@0:     if( opacity < 0.5 )
jens@0:         return NO;
jens@0:     float thresholdAlpha = 0.5 / self.opacity;
jens@0:     
jens@0:     CGColorRef bg = self.backgroundColor;
jens@0:     float alpha = bg ?CGColorGetAlpha(bg) :0.0;
jens@0:     if( alpha < thresholdAlpha ) {
jens@0:         CGImageRef image = (CGImageRef)self.contents;
jens@0:         if( image ) {
jens@0:             // Note: This makes the convenient assumption that the image entirely fills the bounds.
jens@0:             alpha = MAX(alpha, GetPixelAlpha(image, self.bounds.size, p));
jens@0:         }
jens@0:     }
jens@0:     return alpha >= thresholdAlpha;
jens@0: }
jens@0: 
jens@0: 
jens@0: @end