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/*
LevelMeterView.swift
Nikhil Singh, Dr. Richard Boulanger
Adapted from the Csound iOS Examples by Steven Yi and Victor Lazzarini
This file is part of Csound iOS SwiftExamples.
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 UIKit
class LevelMeterView: UIView {
private var lastY: CGFloat = -100
private var count = 0
fileprivate var count2 = 0
fileprivate var channelValue: Float = 0
fileprivate var channelPtr: UnsafeMutablePointer<Float>?
fileprivate var ksmps = 0
fileprivate var sr = 0
var channelName = ""
override func draw(_ rect: CGRect) {
let clipPath = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: 10, height: 10))
clipPath.addClip()
let context = UIGraphicsGetCurrentContext()
let colorSpace = CGColorSpaceCreateDeviceRGB()
context?.translateBy(x: 0, y: rect.size.height)
context?.scaleBy(x: 1, y: -1) // Invert Y Axis
let grayComponents: [CGFloat] = [0.7, 0.7, 0.7, 1.0]
let grayColor = CGColor(colorSpace: colorSpace, components: grayComponents)
context?.setFillColor(grayColor!)
context?.fill(self.bounds)
let width = rect.maxX
let height = rect.maxY
let squareWidth = width - 10
let squareHeight = height/30.0
// Define colors
let greenComponents: [CGFloat] = [0, 1, 0, 1]
let yellowComponents: [CGFloat] = [221.0/250.0, 223.0/250.0, 14.0/250.0, 1.0]
let redComponents: [CGFloat] = [1, 0, 0, 1]
let greenColor = CGColor(colorSpace: colorSpace, components: greenComponents)
let yellowColor = CGColor(colorSpace: colorSpace, components: yellowComponents)
let redColor = CGColor(colorSpace: colorSpace, components: redComponents)
let x: CGFloat = 12
if lastY < (height * 0.7) {
context?.setFillColor(greenColor!)
} else if lastY < (height * 0.9) {
context?.setFillColor(yellowColor!)
} else {
context?.setFillColor(redColor!)
}
context?.move(to: CGPoint(x: x, y: lastY))
context?.addLine(to: CGPoint(x: x, y: lastY + squareHeight))
context?.addLine(to: CGPoint(x: x + squareWidth - 12.0, y: lastY + squareHeight))
context?.addLine(to: CGPoint(x: x + squareWidth - 12.0, y: lastY))
context?.fillPath()
var y: CGFloat = 12
while y < (height * CGFloat(channelValue)) {
if (y < (height * 0.7)) {
context?.setFillColor(greenColor!)
} else if ((y < height * 0.9)) {
context?.setFillColor(yellowColor!)
} else {
context?.setFillColor(redColor!)
}
y += squareHeight + 5
context?.move(to: CGPoint(x: x, y: y))
context?.addLine(to: CGPoint(x: x, y: y + squareHeight))
context?.addLine(to: CGPoint(x: x + squareWidth - 12.0, y: y + squareHeight))
context?.addLine(to: CGPoint(x: x + squareWidth - 12.0, y: y))
context?.fillPath()
}
if y > lastY {
lastY = y
}
if count % 100 == 0 {
lastY = -squareHeight
}
count += 1
}
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
func add(to csoundObj: CsoundObj, for channel: String) {
csoundObj.addBinding(self)
channelName = channel
}
func cleanup() {
channelValue = 0
lastY = -100
setNeedsDisplay()
}
}
extension LevelMeterView: CsoundBinding {
func setup(_ csoundObj: CsoundObj!) {
channelPtr = csoundObj.getOutputChannelPtr(channelName, channelType: CSOUND_AUDIO_CHANNEL)
let cs = csoundObj.getCsound()
sr = Int(csoundGetSr(cs))
ksmps = Int(csoundGetKsmps(cs))
}
func updateValuesFromCsound() {
if channelPtr != nil {
channelValue = fabsf((channelPtr?.pointee)!)
}
if count2 % ((sr/ksmps)/20) == 0 {
DispatchQueue.main.async { [unowned self] in
self.setNeedsDisplay()
}
}
count2 += 1
if count2 > Int.max {
count2 -= Int.max
}
}
}
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