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WaveformRenderer.swift
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WaveformRenderer.swift
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import Foundation
import CoreGraphics
public extension WaveformRenderer {
/**
Default styling. Exposed publicly simply because it is re-used internally in the included renderes. May be useful for other
if other renderes would like to stick to the default behavior.
*/
func defaultStyle(context: CGContext, with configuration: Waveform.Configuration) {
// draw pixel-perfect by default
context.setLineWidth(1.0 / configuration.scale)
switch configuration.style {
case let .filled(color):
context.setFillColor(color.cgColor)
context.fillPath()
case let .outlined(color, lineWidth):
context.setStrokeColor(color.cgColor)
context.setLineWidth(lineWidth)
context.setLineCap(.round)
context.strokePath()
case let .striped(config):
context.setLineWidth(config.width)
context.setLineCap(config.lineCap)
context.setStrokeColor(config.color.cgColor)
context.strokePath()
case let .gradient(colors):
context.clip()
let colors = NSArray(array: colors.map { (color: DSColor) -> CGColor in color.cgColor }) as CFArray
let colorSpace = CGColorSpaceCreateDeviceRGB()
let gradient = CGGradient(colorsSpace: colorSpace, colors: colors, locations: nil)!
context.drawLinearGradient(gradient,
start: CGPoint(x: 0, y: 0),
end: CGPoint(x: 0, y: configuration.size.height),
options: .drawsAfterEndLocation)
case let .gradientOutlined(colors, lineWidth):
context.setLineWidth(lineWidth)
context.replacePathWithStrokedPath()
context.setLineCap(.round)
context.setLineJoin(.round)
context.clip()
let colors = NSArray(array: colors.map { (color: DSColor) -> CGColor in color.cgColor }) as CFArray
let colorSpace = CGColorSpaceCreateDeviceRGB()
let gradient = CGGradient(colorsSpace: colorSpace, colors: colors, locations: nil)!
context.drawLinearGradient(gradient,
start: CGPoint(x: 0, y: 0),
end: CGPoint(x: 0, y: configuration.size.height),
options: .drawsAfterEndLocation)
}
}
}