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fix: Is there a way to create Multi colour spectrogram #3

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fix: Is there a way to create Multi colour spectrogram #3

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9 changes: 8 additions & 1 deletion UIImage+Spectrogram/ImageUtils.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ public class ImageUtils {
let timeWidth = magnitudes.count
let frequencyHeight = magnitudes.first!.count

let pixels = magnitudes.map{ $0.map{ RGBA<Float>(gray: 1-$0) } }
let pixels = magnitudes.map{ $0.map{ ImageUtils.colorForMagnitude(1.0 - $0) } }

let flattenedPixels = pixels.flatMap{ $0 }

Expand Down Expand Up @@ -87,4 +87,11 @@ public class ImageUtils {
public static func mixColor(magnitude: Float) -> UIColor {
return UIColor(hue: 0.75, saturation: CGFloat(magnitude), brightness: 1.0, alpha: 1.0)
}

private static func colorForMagnitude(_ mag: Float) -> RGBA<Float> {
let color = UIColor(hue: CGFloat(mag), saturation: 1.0, brightness: 1.0, alpha: 1.0)
var r: CGFloat = 0, g: CGFloat = 0, b: CGFloat = 0, a: CGFloat = 0
color.getRed(&r, green: &g, blue: &b, alpha: &a)
return RGBA<Float>(red: Float(r), green: Float(g), blue: Float(b), alpha: Float(a))
}
}