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/*
ControlXYGrid.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 ControlXYGrid: UIControl {
private var borderWidth: CGFloat = 10
private var circleRect = CGRect() // Rect for position indicator circle
private var shouldTrack = false
fileprivate var xValue: Float = 0
fileprivate var yValue: Float = 0
fileprivate var xChannelValue: Float = 0
fileprivate var yChannelValue: Float = 0
fileprivate var xChannelPtr: UnsafeMutablePointer<Float>?
fileprivate var yChannelPtr: UnsafeMutablePointer<Float>?
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = .clear
circleRect = CGRect(x: borderWidth, y: frame.size.height - 30.0 - borderWidth, width: 30.0, height: 30.0)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
backgroundColor = .clear
circleRect = CGRect(x: borderWidth, y: frame.size.height - 30.0 - borderWidth, width: 30.0, height: 30.0)
}
func setXValue(_ value: CGFloat) {
let maxX = frame.size.width - borderWidth - circleRect.size.width
let xPosition: CGFloat = value * (maxX - borderWidth)
circleRect.origin.x = xPosition * borderWidth
setNeedsDisplay()
sendActions(for: .valueChanged)
}
func setYValue(_ value: CGFloat) {
xValue = Float(value)
let maxY = frame.size.height - borderWidth - circleRect.size.height
let yPosition = value * (maxY - borderWidth)
circleRect.origin.y = yPosition
setNeedsDisplay()
sendActions(for: .valueChanged)
}
func setCircleDiameter(_ diameter: CGFloat) {
circleRect = CGRect(x: borderWidth, y: frame.size.height - diameter - borderWidth, width: diameter, height: diameter)
setNeedsDisplay()
}
// MARK: UIControl Overrides
override func beginTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
var location = touch.location(in: self)
location.x -= circleRect.size.width/2.0
location.y -= circleRect.size.height/2.0
let maxX = frame.size.width - borderWidth - circleRect.size.width
let maxY = frame.size.height - borderWidth - circleRect.size.height
let minX = borderWidth, minY = borderWidth
location.x = location.x < minX ? minX : location.x
location.y = location.y < minY ? minY : location.y
location.x = location.x > maxX ? maxX : location.x
location.y = location.y > maxY ? maxY : location.y
circleRect.origin.x = location.x
circleRect.origin.y = location.y
xValue = Float(location.x/maxX)
yValue = Float(1 - location.y/maxY)
shouldTrack = true
setNeedsDisplay()
sendActions(for: .valueChanged)
return true
}
override func continueTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
var location = touch.location(in: self)
if shouldTrack {
location.x -= circleRect.size.width/2.0
location.y -= circleRect.size.height/2.0
let maxX = frame.size.width - borderWidth - circleRect.size.width
let maxY = frame.size.height - borderWidth - circleRect.size.height
let minX = borderWidth, minY = borderWidth
location.x = location.x < minX ? minX : location.x
location.y = location.y < minY ? minY : location.y
location.x = location.x > maxX ? maxX : location.x
location.y = location.y > maxY ? maxY : location.y
circleRect.origin.x = location.x
circleRect.origin.y = location.y
xValue = Float(location.x/maxX)
yValue = Float(1 - location.y/maxY)
}
setNeedsDisplay()
sendActions(for: .valueChanged)
return true
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
shouldTrack = false
}
override func draw(_ rect: CGRect) {
let clipPath = UIBezierPath(roundedRect: bounds, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: 10, height: 10))
clipPath.addClip()
let context = UIGraphicsGetCurrentContext()
UIColor.black.set()
context?.setLineWidth(borderWidth * 2.0)
context?.setLineJoin(.round)
let borderPath = CGMutablePath()
borderPath.move(to: CGPoint(x: 0, y: 0))
borderPath.addLine(to: CGPoint(x: 0, y: rect.size.height))
borderPath.addLine(to: CGPoint(x: rect.size.width, y: rect.size.height))
borderPath.addLine(to: CGPoint(x: rect.size.width, y: 0))
borderPath.addLine(to: CGPoint(x: 0, y: 0))
context?.addPath(borderPath)
context?.drawPath(using: .stroke)
context?.addEllipse(in: circleRect)
context?.fillEllipse(in: circleRect)
}
func cleanup() {
removeTarget(self, action: #selector(updateChannelValues(_:)), for: .valueChanged)
}
}
extension ControlXYGrid: CsoundBinding {
func setup(_ csoundObj: CsoundObj!) {
xChannelPtr = csoundObj.getInputChannelPtr("mix", channelType: CSOUND_CONTROL_CHANNEL)
yChannelPtr = csoundObj.getInputChannelPtr("pitch", channelType: CSOUND_CONTROL_CHANNEL)
xChannelValue = xValue
yChannelValue = yValue
addTarget(self, action: #selector(updateChannelValues(_:)), for: .valueChanged)
}
@objc func updateChannelValues(_ sender: AnyObject) {
if sender is ControlXYGrid {
let XYGrid = sender as! ControlXYGrid
xChannelValue = XYGrid.xValue
yChannelValue = XYGrid.yValue
}
}
func updateValuesToCsound() {
xChannelPtr?.pointee = xChannelValue
yChannelPtr?.pointee = yChannelValue
}
}
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