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GarySabo's questions

Martin Hope
GarySabo
Asked: 2023-09-27 00:01:53 +0800 CST
  • 6

与这个问题密切相关的是，线性梯度代码运行良好，但它总是与其数据相关联，因此例如下面的代码，如果您有一系列从 70 到 110 的心率，则较低的心率始终为灰色，较高的心率始终为灰色紫色，但 90 到 195 的数组也是如此。如何映射停靠点以使颜色与心率区域相对应？换句话说，心率从 70-110 只会显示蓝色到橙色？

 Chart {
            ForEach(smoothHeartRatesEMA(customHeartRates, decayFactor: 0.3)) { heartRate in
                LineMark(
                    x: .value("Sample Time", heartRate.startDate, unit: .nanosecond), //changed these to .nanosecond to fix Nike Run Club bug (some how Nike Run Club gets more frequent HR samples than other apps?)
                    y: .value("Heart Rate", heartRate.doubleValue)
                )
                .lineStyle(StrokeStyle(lineWidth: 3.0))
                .foregroundStyle(
                    .linearGradient(
                        stops: [
                            .init(color: Color.gray, location: 0.0),
                            .init(color:  TrackerConstants.AppleFitnessBlue, location: 0.16),
                            .init(color: TrackerConstants.AppleFitnessYellow, location: 0.33),
                            .init(color: TrackerConstants.AppleFitnessOrange, location: 0.5),
                            .init(color: TrackerConstants.AppleFitnessRed, location: 0.66),
                            .init(color: TrackerConstants.AppleFitnessPurple, location: 1.0) //how do I get these to allign with a range of e.g. 170-210.  I.e. if no heart rate is above 170bpm, the line is never purple?
                        ],
                        startPoint: .bottom,
                        endPoint: .top)
                         )
            }
        }
        .chartYScale(domain: 50...210)
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