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SKTextureGradient
//
// SKTextureGradient.swift
// Linear gradient texture
// Based on: https://gist.github.com/Tantas/7fc01803d6b559da48d6, https://gist.github.com/craiggrummitt/ad855e358004b5480960
//
// Created by Maxim on 1/1/16.
// Copyright © 2016 Maxim Bilan. All rights reserved.
//
import SpriteKit
public enum GradientDirection {
case Up
case Left
case UpLeft
case UpRight
}
public extension SKTexture {
convenience init(size: CGSize, color1: CIColor, color2: CIColor, direction: GradientDirection = .Up) {
let context = CIContext(options: nil)
let filter = CIFilter(name: "CILinearGradient")
var startVector: CIVector
var endVector: CIVector
filter!.setDefaults()
switch direction {
case .Up:
startVector = CIVector(x: size.width * 0.5, y: 0)
endVector = CIVector(x: size.width * 0.5, y: size.height)
case .Left:
startVector = CIVector(x: size.width, y: size.height * 0.5)
endVector = CIVector(x: 0, y: size.height * 0.5)
case .UpLeft:
startVector = CIVector(x: size.width, y: 0)
endVector = CIVector(x: 0, y: size.height)
case .UpRight:
startVector = CIVector(x: 0, y: 0)
endVector = CIVector(x: size.width, y: size.height)
}
filter!.setValue(startVector, forKey: "inputPoint0")
filter!.setValue(endVector, forKey: "inputPoint1")
filter!.setValue(color1, forKey: "inputColor0")
filter!.setValue(color2, forKey: "inputColor1")
let image = context.createCGImage(filter!.outputImage!, fromRect: CGRect(x: 0, y: 0, width: size.width, height: size.height))
self.init(CGImage: image)
}
}
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