GeekGameBoard: Source/Piece.m@73f8c889f053

     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) init

    31 {

    32     self = [super init];

    33     if (self != nil) {

    34         self.zPosition = kPieceZ;

    35     }

    36     return self;

    37 }

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

    42                     scale: (CGFloat)scale

    43 {

    44     self = [self init];

    45     if (self != nil) {

    46         [self setImageNamed: imageName scale: scale];

    47     }

    48     return self;

    49 }

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

    53 {

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

    55     clone.imageName = self.imageName;

    56     return clone;

    57 }

    60 - (void) dealloc

    61 {

    62     [_imageName release];

    63     [super dealloc];

    64 }

    67 - (NSString*) description

    68 {

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

    70             [self class],

    71             _imageName.lastPathComponent.stringByDeletingPathExtension];

    72 }

    75 @synthesize imageName=_imageName;

    78 - (void) _setImage: (CGImageRef)image

    79 {

    80     self.contents = (id) image;

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

    82     self.contentsGravity = kCAGravityResizeAspect;

    83     self.minificationFilter = kCAFilterLinear;

    84     self.imageName = nil;

    85 }

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

    89 {

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

    91 }

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

    94 {

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

    96     self.imageName = imageName;

    97 }

    99 - (void) setImage: (CGImageRef)image

   100 {

   101     CGSize size = self.bounds.size;

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

   103 }

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

   106 {

   107     [self setImage: GetCGImageNamed(name)];

   108     self.imageName = name;

   109 }

   112 - (BOOL)containsPoint:(CGPoint)p

   113 {

   114     // Overrides CGLayer's implementation,

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

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

   117     if( ! [super containsPoint: p] )

   118         return NO;

   119     float opacity = self.opacity;

   120     if( opacity < 0.5 )

   121         return NO;

   122     float thresholdAlpha = 0.5 / self.opacity;

   124     CGColorRef bg = self.backgroundColor;

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

   126     if( alpha < thresholdAlpha ) {

   127         CGImageRef image = (CGImageRef)self.contents;

   128         if( image ) {

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

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

   131         }

   132     }

   133     return alpha >= thresholdAlpha;

   134 }

   137 #if ! TARGET_OS_IPHONE

   139 // An image from another app can be dragged onto a Piece to change its background pattern.

   141 - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender

   142 {

   143     if( CanGetCGImageFromPasteboard([sender draggingPasteboard]) )

   144         return NSDragOperationCopy;

   145     else

   146         return NSDragOperationNone;

   147 }

   149 - (BOOL)performDragOperation:(id <NSDraggingInfo>)sender

   150 {

   151     CGImageRef image = GetCGImageFromPasteboard([sender draggingPasteboard],sender);

   152     if( image ) {

   153         [self setValue: (id)image ofStyleProperty: @"contents"];

   154         return YES;

   155     } else

   156         return NO;

   157 }

   159 #endif

   162 @end

author	Jens Alfke <jens@mooseyard.com>
	Wed Jul 09 17:07:45 2008 -0700 (2008-07-09)
changeset 15	73f8c889f053
parent 9	a59acc683080
permissions	-rw-r--r--