PHPixelHeartAnimation.m

//
// Copyright 2013 Jeff Verkoeyen
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#import "PHPixelHeartAnimation.h"

@implementation PHPixelHeartAnimation {
  PHSpritesheet* _spritesheet;
  PHSpriteAnimation* _animation;
}

- (id)init {
  if ((self = [super init])) {
    _spritesheet = [[PHSpritesheet alloc] initWithName:@"pixelheart" spriteSize:CGSizeMake(26, 23)];
    _animation = [[PHSpriteAnimation alloc] initWithSpritesheet:_spritesheet];
    [_animation addStillFrameAtX:0 y:0];
    _animation.repeats = YES;
    _animation.bounces = NO;
  }
  return self;
}

- (void)renderBitmapInContext:(CGContextRef)cx size:(CGSize)size {
  CGContextSaveGState(cx);
  CGSize spriteSize = _spritesheet.spriteSize;

  CGFloat value = self.bassDegrader.value;
  CGImageRef imageRef = [_animation imageRefAtCurrentTick];
  CGRect heartFrame = CGRectMake(floorf((size.width - spriteSize.width) / 2),
                                 floorf((size.height - spriteSize.height) / 2),
                                 spriteSize.width,
                                 spriteSize.height);

  heartFrame = CGRectInset(heartFrame, (1 - value) * 10 - 5, (1 - value) * 10 - 5);
  CGContextDrawImage(cx, heartFrame, imageRef);
  CGImageRelease(imageRef);

  CGContextRestoreGState(cx);
}

- (void)renderPreviewInContext:(CGContextRef)cx size:(CGSize)size {
  [self.bassDegrader tickWithPeak:0.5];
  [self renderBitmapInContext:cx size:size];
}

- (NSString *)tooltipName {
  return @"Pixel Heart";
}

- (NSArray *)categories {
  return @[
    PHAnimationCategoryPixelHeart
  ];
}

@end