Andras Samu
ac7680320f
now it is possible to add background lines precisely as charts are displayed at correct size also rewrote basics to conform with Shapes and Animatable protocol
42 lines
1.2 KiB
Swift
42 lines
1.2 KiB
Swift
import SwiftUI
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extension CGPoint {
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/// Calculate X and Y delta for each data point, based on data min/max and enclosing frame.
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/// - Parameters:
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/// - frame: Rectangle of enclosing frame
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/// - data: array of `Double`
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/// - Returns: X and Y delta as a `CGPoint`
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static func getStep(frame: CGRect, data: [Double]) -> CGPoint {
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let padding: CGFloat = 0
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// stepWidth
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var stepWidth: CGFloat = 0.0
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if data.count < 2 {
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stepWidth = 0.0
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}
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stepWidth = frame.size.width / CGFloat(data.count - 1)
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// stepHeight
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var stepHeight: CGFloat = 0.0
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var min: Double?
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var max: Double?
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if let minPoint = data.min(), let maxPoint = data.max(), minPoint != maxPoint {
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min = minPoint
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max = maxPoint
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} else {
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return .zero
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}
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if let min = min, let max = max, min != max {
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if min <= 0 {
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stepHeight = (frame.size.height - padding) / CGFloat(max - min)
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} else {
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stepHeight = (frame.size.height - padding) / CGFloat(max + min)
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}
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}
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return CGPoint(x: stepWidth, y: stepHeight)
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}
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}
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