GeekGameBoard: Source/Piece.m@6c78cc6bd7a6

     1 /*  This code is based on Apple's "GeekGameBoard" sample code, version 1.0.

     2     http://developer.apple.com/samplecode/GeekGameBoard/

     3     Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.

     5     Redistribution and use in source and binary forms, with or without modification, are permitted

     6     provided that the following conditions are met:

     8     * Redistributions of source code must retain the above copyright notice, this list of conditions

     9       and the following disclaimer.

    10     * Redistributions in binary form must reproduce the above copyright notice, this list of

    11       conditions and the following disclaimer in the documentation and/or other materials provided

    12       with the distribution.

    14     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR

    15     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

    16     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-

    17     BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    18     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    19     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    20     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF

    21     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    22 */

    23 #import "Piece.h"

    24 #import "QuartzUtils.h"

    27 @implementation Piece

    30 - (id) initWithImageNamed: (NSString*)imageName

    31                     scale: (CGFloat)scale

    32 {

    33     self = [super init];

    34     if (self != nil) {

    35         [self setImageNamed: imageName scale: scale];

    36         self.zPosition = kPieceZ;

    37     }

    38     return self;

    39 }

    42 - (id) copyWithZone: (NSZone*)zone

    43 {

    44     Piece *clone = [super copyWithZone: zone];

    45     clone.imageName = self.imageName;

    46     return clone;

    47 }

    50 - (void) dealloc

    51 {

    52     [_imageName release];

    53     [super dealloc];

    54 }

    57 - (NSString*) description

    58 {

    59     return [NSString stringWithFormat: @"%@[%@]",

    60             [self class],

    61             _imageName.lastPathComponent.stringByDeletingPathExtension];

    62 }

    65 @synthesize imageName=_imageName;

    68 - (void) _setImage: (CGImageRef)image

    69 {

    70     self.contents = (id) image;

    71     self.bounds = CGRectMake(0,0,CGImageGetWidth(image),CGImageGetHeight(image));

    72     self.contentsGravity = kCAGravityResizeAspect;

    73     self.minificationFilter = kCAFilterLinear;

    74     self.imageName = nil;

    75 }

    78 - (void) setImage: (CGImageRef)image scale: (CGFloat)scale

    79 {

    80     [self _setImage: CreateScaledImage(image,scale)];

    81 }

    83 - (void) setImageNamed: (NSString*)imageName scale: (CGFloat)scale

    84 {

    85     [self _setImage: GetScaledImageNamed(imageName,scale)];

    86     self.imageName = imageName;

    87 }

    89 - (void) setImage: (CGImageRef)image

    90 {

    91     CGSize size = self.bounds.size;

    92     [self setImage: image scale: MAX(size.width,size.height)];

    93 }

    95 - (void) setImageNamed: (NSString*)name

    96 {

    97     [self setImage: GetCGImageNamed(name)];

    98     self.imageName = name;

    99 }

   102 - (BOOL)containsPoint:(CGPoint)p

   103 {

   104     // Overrides CGLayer's implementation,

   105     // returning YES only for pixels at which this layer's alpha is at least 0.5.

   106     // This takes into account the opacity, bg color, and background image's alpha channel.

   107     if( ! [super containsPoint: p] )

   108         return NO;

   109     float opacity = self.opacity;

   110     if( opacity < 0.5 )

   111         return NO;

   112     float thresholdAlpha = 0.5 / self.opacity;

   114     CGColorRef bg = self.backgroundColor;

   115     float alpha = bg ?CGColorGetAlpha(bg) :0.0;

   116     if( alpha < thresholdAlpha ) {

   117         CGImageRef image = (CGImageRef)self.contents;

   118         if( image ) {

   119             // Note: This makes the convenient assumption that the image entirely fills the bounds.

   120             alpha = MAX(alpha, GetPixelAlpha(image, self.bounds.size, p));

   121         }

   122     }

   123     return alpha >= thresholdAlpha;

   124 }

   127 @end

author	Jens Alfke <jens@mooseyard.com>
	Thu Jul 03 17:44:30 2008 -0700 (2008-07-03)
changeset 10	6c78cc6bd7a6
parent 1	3eb7be1dd7b6
child 11	436cbdf56810
permissions	-rw-r--r--