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/*
LevelMeterView.m:
Copyright (C) 2014 Thomas Hass, Aurelius Prochazka
This file is part of Csound iOS Examples.
The Csound for iOS Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA
*/
#import "LevelMeterView.h"
@interface LevelMeterView () {
float channelValue;
float *channelPtr;
CGFloat lastY;
NSInteger ksmps, sr;
}
@property (nonatomic, strong) NSString *channelName;
@end
@implementation LevelMeterView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
channelValue = 0.0f;
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
channelValue = 0.0f;
lastY = -100;
}
return self;
}
- (void)addToCsoundObj:(CsoundObj *)csoundObj forChannelName:(NSString *)channelName_
{
[csoundObj addBinding:self];
self.channelName = channelName_;
}
- (void)drawRect:(CGRect)rect
{
// Round the corners
UIBezierPath *clipPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds
byRoundingCorners:UIRectCornerAllCorners
cornerRadii:CGSizeMake(10.0, 10.0)];
[clipPath addClip];
// Get the context
CGContextRef context = UIGraphicsGetCurrentContext();
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
// Flip coordinate system
CGContextTranslateCTM(context, 0, rect.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
// Draw background
CGFloat grayComponents[] = {0.7f, 0.7f, 0.7f, 1.0f};
CGColorRef grayColor = CGColorCreate(colorSpace, grayComponents);
CGContextSetFillColorWithColor(context, grayColor);
CGContextFillRect(context, self.bounds);
CGColorRelease(grayColor);
// Draw rects
CGFloat width = CGRectGetMaxX(rect);
CGFloat height = CGRectGetMaxY(rect);
CGFloat squareWidth = width - 10;
CGFloat squareHeight = height/30.0f;;
CGFloat greenComponents[] = {0.0f, 1.0f, 0.0f, 1.0f};
CGFloat yellowComponents[] = {221.0f/250.0f, 223.0f/250.0f, 14.0f/250.0f, 1.0f};
CGFloat redComponents[] = {1.0f, 0.0f, 0.0f, 1.0f};
CGColorRef greenColor = CGColorCreate(colorSpace, greenComponents);
CGColorRef yellowColor = CGColorCreate(colorSpace, yellowComponents);
CGColorRef redColor = CGColorCreate(colorSpace, redComponents);
CGFloat x = 12.0f;
// Draw the peak rect.
if (lastY < (height * 0.7f)) {
CGContextSetFillColorWithColor(context, greenColor);
} else if (lastY < (height * 0.9f)) {
CGContextSetFillColorWithColor(context, yellowColor);
} else {
CGContextSetFillColorWithColor(context, redColor);
}
CGContextMoveToPoint(context, x, lastY);
CGContextAddLineToPoint(context, x, lastY + squareHeight);
CGContextAddLineToPoint(context, x + squareWidth - 12.0f, lastY + squareHeight);
CGContextAddLineToPoint(context, x + squareWidth - 12.0f, lastY);
CGContextFillPath(context);
// Draw the rest of the rects.
for (int y = 12.0f; y < height * channelValue - 12.0f; y += squareHeight + 5.0f) {
if (y < (height * 0.7f)) {
CGContextSetFillColorWithColor(context, greenColor);
} else if ((y < height * 0.9f)) {
CGContextSetFillColorWithColor(context, yellowColor);
} else {
CGContextSetFillColorWithColor(context, redColor);
}
CGContextMoveToPoint(context, x, y);
CGContextAddLineToPoint(context, x, y + squareHeight);
CGContextAddLineToPoint(context, x + squareWidth - 12.0f, y + squareHeight);
CGContextAddLineToPoint(context, x + squareWidth - 12.0f, y);
CGContextFillPath(context);
if (y > lastY) {
lastY = y;
}
}
CGColorRelease(greenColor);
CGColorRelease(yellowColor);
CGColorRelease(redColor);
CGColorSpaceRelease(colorSpace);
// Reset lastY periodically.
static NSInteger count = 0;
if (count % 100 == 0) {
lastY = -squareHeight;
}
count++;
}
#pragma mark - Csound Binding
-(void)setup:(CsoundObj *)csoundObj
{
channelPtr = [csoundObj getOutputChannelPtr:self.channelName channelType:CSOUND_AUDIO_CHANNEL];
CSOUND *cs = [csoundObj getCsound];
sr = csoundGetSr(cs);
ksmps = csoundGetKsmps(cs);
}
-(void)updateValuesFromCsound
{
channelValue = fabs(*channelPtr);
static NSInteger count = 0;
if (count % ((sr/ksmps)/20) == 0) {
[self performSelectorOnMainThread:@selector(setNeedsDisplay) withObject:nil waitUntilDone:NO];
}
count++;
if (count > INT_MAX) {
count -= INT_MAX;
}
}
- (void)cleanup
{
channelValue = 0;
lastY = -100;
[self setNeedsDisplay];
}
@end
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