GeekGameBoard: Source/Piece.m@af9b2b929b03

     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.imageName = imageName;

    36         [self setImage: GetCGImageNamed(imageName) scale: scale];

    37         self.zPosition = kPieceZ;

    38     }

    39     return self;

    40 }

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

    44 {

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

    46     clone.imageName = self.imageName;

    47     return clone;

    48 }

    51 - (void) dealloc

    52 {

    53     [_imageName release];

    54     [super dealloc];

    55 }

    58 - (NSString*) description

    59 {

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

    61             [self class],

    62             _imageName.lastPathComponent.stringByDeletingPathExtension];

    63 }

    66 @synthesize imageName=_imageName;

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

    70 {

    71     self.contents = (id) image;

    72     self.contentsGravity = @"resize";

    73     self.minificationFilter = kCAFilterLinear;

    74     int width = CGImageGetWidth(image), height = CGImageGetHeight(image);

    75     if( scale > 0 ) {

    76         if( scale >= 4.0 )

    77             scale /= MAX(width,height);             // interpret scale as target dimensions

    78         width = ceil( width * scale);

    79         height= ceil( height* scale);

    80     }

    81     self.bounds = CGRectMake(0,0,width,height);

    82     self.imageName = nil;

    83 }

    85 - (void) setImage: (CGImageRef)image

    86 {

    87     CGSize size = self.bounds.size;

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

    89 }

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

    92 {

    93     [self setImage: GetCGImageNamed(name)];

    94     self.imageName = name;

    95 }

    98 - (BOOL)containsPoint:(CGPoint)p

    99 {

   100     // Overrides CGLayer's implementation,

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

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

   103     if( ! [super containsPoint: p] )

   104         return NO;

   105     float opacity = self.opacity;

   106     if( opacity < 0.5 )

   107         return NO;

   108     float thresholdAlpha = 0.5 / self.opacity;

   110     CGColorRef bg = self.backgroundColor;

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

   112     if( alpha < thresholdAlpha ) {

   113         CGImageRef image = (CGImageRef)self.contents;

   114         if( image ) {

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

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

   117         }

   118     }

   119     return alpha >= thresholdAlpha;

   120 }

   123 @end

author	Jens Alfke <jens@mooseyard.com>
	Wed Mar 12 15:51:32 2008 -0700 (2008-03-12)
changeset 6	af9b2b929b03
parent 0	e9f7ba4718e1
child 9	a59acc683080
permissions	-rw-r--r--