teaching machines

CS 491 Lecture 3 – iPopper cont’d

September 10, 2013 by Chris Johnson. Filed under cs491 mobile, fall 2013, lectures.

Agenda

• groups
• modeling the bubbles
• redrawing
• handling touches
• multitouch
• audio
• NSMutableArray
• properties

Code

PopperView.m

//
//  PopperView.m
//  iPopper
//
//  Created by Christopher R. Johnson on 9/5/13.
//  Copyright (c) 2013 UWEC. All rights reserved.
//

#import <AVFoundation/AVFoundation.h>
#import "PopperView.h"

@interface PopperView () {
    UIImage *images[2];
    BOOL *isPopped;
}

@property int nrows;
@property int ncols;
@property NSMutableArray *players;
@end

@implementation PopperView
@synthesize nrows = _nrows;
@synthesize ncols = _ncols;
@synthesize players = _players;

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        // do initialization of instance variables
        [self setBackgroundColor:[UIColor redColor]];
        images[0] = [UIImage imageNamed:@"unpopped"];
        images[1] = [UIImage imageNamed:@"popped"];
        
        self.nrows = ceil(self.bounds.size.height / images[0].size.height);
        self.ncols = ceil(self.bounds.size.width / images[0].size.width);
        isPopped = (BOOL *) malloc(self.nrows * self.ncols * sizeof(BOOL));
        for (int r = 0; r < self.nrows; ++r) {
            for (int c = 0; c < self.ncols; ++c) {
                isPopped[c + r * self.ncols] = NO;
            }
        }
        
        self.players = [[NSMutableArray alloc] init];
        self.multipleTouchEnabled = YES;
    }
    return self;
}

- (void)drawRect:(CGRect)dirtyRect {
    CGContextRef canvas = UIGraphicsGetCurrentContext();
    
    for (int r = 0; r < self.nrows; ++r) {
        for (int c = 0; c < self.ncols; ++c) {
            CGRect drawIntoRect = CGRectMake(c * images[0].size.width, r * images[0].size.height, images[0].size.width, images[0].size.height);
            int i = isPopped[c + r * self.ncols] ? 1 : 0;
            CGContextDrawImage(canvas, drawIntoRect, [images[i] CGImage]);
        }
    }
}

- (void)popAtPoint:(CGPoint)point {
    int r = point.y / images[0].size.height;
    int c = point.x / images[0].size.width;
    if (!isPopped[c + r * self.ncols]) {
        isPopped[c + r * self.ncols] = YES;
        [self setNeedsDisplay];
        
        int i = arc4random_uniform(3) + 1;
        NSString *clipName = [NSString stringWithFormat:@"pop%d", i];
        NSString *path = [[NSBundle mainBundle] pathForResource:clipName ofType:@"mp3"];
        NSURL *url = [[NSURL alloc] initFileURLWithPath:path];
        AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
        [audioPlayer play];
        [self.players addObject:audioPlayer];
    }
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    for (UITouch *touch in touches) {
        [self popAtPoint:[touch locationInView:self]];
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    for (UITouch *touch in touches) {
        [self popAtPoint:[touch locationInView:self]];
    }
}

@end

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