44 lines
1.3 KiB
Swift
44 lines
1.3 KiB
Swift
//
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// DataRepresentable.swift
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//
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//
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// Created by Alexey Pichukov on 19.08.2020.
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//
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// Modified by Marcus Kida for Mastodon on 30.01.2023.
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import Foundation
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import CoreGraphics
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protocol DataRepresentable {
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func points(forData data: [Double], frame: CGRect, offset: Double, lineWidth: CGFloat) -> [CGPoint]
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func lineWidth(visualType: ChartVisualType) -> CGFloat
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}
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extension DataRepresentable {
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func points(forData data: [Double], frame: CGRect, offset: Double, lineWidth: CGFloat) -> [CGPoint] {
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var vector = Math.stretchOut(Math.norm(data))
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if offset != 0 {
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vector = Math.stretchIn(vector, offset: offset)
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}
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var points: [CGPoint] = []
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for i in 0..<vector.count {
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let x = frame.size.width / CGFloat(vector.count - 1) * CGFloat(i)
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let y = (frame.size.height - lineWidth) * CGFloat(vector[i]) + lineWidth / 2
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points.append(CGPoint(x: x, y: y))
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}
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return points
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}
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func lineWidth(visualType: ChartVisualType) -> CGFloat {
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switch visualType {
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case .outline(_, let lineWidth):
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return lineWidth
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case .filled(_, let lineWidth):
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return lineWidth
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case .customFilled(_, let lineWidth, _):
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return lineWidth
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}
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}
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}
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