FlexMonkey

extension CGRect
{
    func aspectFitInRect(target target: CGRect) -> CGRect
    {
        let scale: CGFloat =
        {
            let scale = target.width / self.width
            
            return self.height * scale <= target.height ?
                scale :

FlexMonkey

extension UIBezierPath
{
    func interpolatePointsWithHermite(interpolationPoints : [CGPoint])
    {
        let n = interpolationPoints.count - 1
        
        for var ii = 0; ii < n; ++ii
        {
            var currentPoint = interpolationPoints[ii]
            

FlexMonkey

extension CGPoint
{
    func distanceTo(point: CGPoint) -> CGFloat
    {
        return hypot(self.x - point.x, self.y - point.y)
    }
}

FlexMonkey

class ThresholdFilter: CIFilter
{
    var inputImage : CIImage?
    var threshold: CGFloat = 0.75
    
    let thresholdKernel = CIColorKernel(string:
        "kernel vec4 thresholdFilter(__sample image, float threshold)" +
        "{" +
            "   float luma = (image.r * 0.2126) + (image.g * 0.7152) + (image.b * 0.0722);" +
            

FlexMonkey

import UIKit

typealias RGBA = (red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat)

extension UIColor
{
    func multiply(value: CGFloat) -> UIColor
    {
        let newRed = getRGBA().red * value
        let newGreen = getRGBA().green * value

FlexMonkey

extension CIVector
{
    func toArray() -> [CGFloat]
    {
        var returnArray = [CGFloat]()
        
        for i in 0 ..< self.count
        {
            returnArray.append(self.valueAtIndex(i))
        }

FlexMonkey

extension CGRect
{
    
    /// Return corners in order of top left, top right, bottom left, bottom right
    var corners: [CGPoint]
    {
        return [
            CGPoint(x: minX, y: minY),
            CGPoint(x: maxX, y: minY),
            CGPoint(x: minX, y: maxY),

FlexMonkey

func UIImageEqualToImage(image1: UIImage, _ image2: UIImage, ciContext: CIContext? = nil) -> Bool
{
    guard let
        ciImage1 = CIImage(image: image1),
        ciImage2 = CIImage(image: image2) where image1.size == image2.size else
    {
        return false
    }
 
    let ctx = ciContext ?? CIContext()

FlexMonkey

// Could benefit from some defensive coding :)

import Photos

let url = info[UIImagePickerControllerReferenceURL] as! NSURL
 
let fetchResult = PHAsset.fetchAssetsWithALAssetURLs([url], options: nil)
        
let asset = fetchResult.firstObject as! PHAsset

FlexMonkey

extension CGFloat
{
    func saturate() -> CGFloat
    {
        return self < 0 ? 0 : self > 1 ? 1 : self
    }
    
    func smootherStep() -> CGFloat
    {
        let x = self.saturate()