C4 Advent Calendar #3 AudioPlayerSample _1 #BLOG

C4WorkSpace.m

//
//  C4WorkSpace.m
//  AudioPlayerSample
//
//  Created by SOMTD on 2013/12/03.
//

@implementation C4WorkSpace {
    C4Sample *sample;
    
    //UI(rate)
    C4Slider *rateSlider;
    C4Label  *rateLabel;
    
    //UI(pan)
    C4Slider *panSlider;
    C4Label  *panLabel;
    
    //UI(volume)
    C4Slider *volumeSlider;
    C4Label  *volumeLabel;
}

-(void)setup {
    sample = [C4Sample sampleNamed:@"C4Loop.aif"];
    sample.loops = YES;
    sample.rate = 1.0;
    sample.pan  = 0.0;
    sample.volume = 0.5;
    [sample play];
    
    [self setupUI];
}

-(void)changeRate:(C4Slider *)aSlider {
    sample.rate = aSlider.value + 0.5;
    rateLabel.text = [NSString stringWithFormat:@"Current rate is: %4.2f", sample.rate];
}

-(void)changePan:(C4Slider *)aSlider {
    sample.pan = (aSlider.value * 2) - 1;
    panLabel.text = [NSString stringWithFormat:@"Current pan is: %4.2f", sample.pan];
}

-(void)changeVolume:(C4Slider *)aSlider {
    sample.volume = aSlider.value;
    volumeLabel.text = [NSString stringWithFormat:@"Current volume is: %4.2f", sample.volume];
}

-(void)setupUI {
    //UI(rate)
    rateSlider = [C4Slider slider:CGRectMake(0, 0, 300, 44)];
    rateSlider.center = CGPointMake(self.canvas.width/2, self.canvas.height/4);
    rateSlider.value = sample.rate - 0.5;
    
    NSString *rateText = [NSString stringWithFormat:@"Current rate is: %4.2f", sample.rate];
    rateLabel = [C4Label labelWithText:rateText];
    CGPoint rateLabelCenter = rateSlider.center;
    rateLabelCenter.y -= rateSlider.height / 2 + rateLabel.height;
    rateLabel.center = rateLabelCenter;
    rateLabel.textColor = C4BLUE;
    rateLabel.font = [C4Font fontWithName:@"ArialRoundedMTBold" size:22.0f];
    
    //UI(pan)
    panSlider = [C4Slider slider:CGRectMake(0, 0, 300, 44)];
    panSlider.center = CGPointMake(self.canvas.width/2, self.canvas.height/2);
    panSlider.value = (sample.pan + 1) / 2;
    
    NSString *panText = [NSString stringWithFormat:@"  Current pan is: %4.2f  ", sample.pan];
    panLabel = [C4Label labelWithText:panText];
    CGPoint panLabelCenter = panSlider.center;
    panLabelCenter.y -= panSlider.height / 2 + panLabel.height;
    panLabel.center = panLabelCenter;
    panLabel.textColor = C4RED;
    panLabel.font = [C4Font fontWithName:@"ArialRoundedMTBold" size:22.0f];
    
    //UI(volume)
    volumeSlider = [C4Slider slider:CGRectMake(0, 0, 300, 44)];
    volumeSlider.center = CGPointMake(self.canvas.width/2, self.canvas.height*3/4);
    volumeSlider.value = sample.volume;
    
    NSString *volumeText = [NSString stringWithFormat:@"Current volume is: %4.2f", sample.volume];
    volumeLabel = [C4Label labelWithText:volumeText];
    CGPoint volumeLabelCenter = volumeSlider.center;
    volumeLabelCenter.y -= volumeSlider.height / 2 + volumeLabel.height;
    volumeLabel.center = volumeLabelCenter;
    volumeLabel.textColor = C4GREY;
    volumeLabel.font = [C4Font fontWithName:@"ArialRoundedMTBold" size:22.0f];
    
    [rateSlider   runMethod:@"changeRate:"   target:self forEvent:VALUECHANGED];
    [panSlider    runMethod:@"changePan:"    target:self forEvent:VALUECHANGED];
    [volumeSlider runMethod:@"changeVolume:" target:self forEvent:VALUECHANGED];
    
    [self.canvas addSubview:rateSlider];
    [self.canvas addLabel:rateLabel];
    [self.canvas addSubview:panSlider];
    [self.canvas addLabel:panLabel];
    [self.canvas addSubview:volumeSlider];
    [self.canvas addLabel:volumeLabel];
    
}
@end