添加项目文件。

Live-Charts-master/Core/SeriesAlgorithms/HeatAlgorithm.cs

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+//The MIT License(MIT)
+
+//Copyright(c) 2016 Alberto Rodriguez & LiveCharts Contributors
+
+//Permission is hereby granted, free of charge, to any person obtaining a copy
+//of this software and associated documentation files (the "Software"), to deal
+//in the Software without restriction, including without limitation the rights
+//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//copies of the Software, and to permit persons to whom the Software is
+//furnished to do so, subject to the following conditions:
+
+//The above copyright notice and this permission notice shall be included in all
+//copies or substantial portions of the Software.
+
+//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//SOFTWARE.5
+
+using System.Collections.Generic;
+using System.Linq;
+using LiveCharts.Defaults;
+using LiveCharts.Definitions.Points;
+using LiveCharts.Definitions.Series;
+using LiveCharts.Dtos;
+using LiveCharts.Helpers;
+
+namespace LiveCharts.SeriesAlgorithms
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <seealso cref="LiveCharts.SeriesAlgorithm" />
+    /// <seealso cref="LiveCharts.Definitions.Series.ICartesianSeries" />
+    public class HeatAlgorithm : SeriesAlgorithm, ICartesianSeries
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="HeatAlgorithm"/> class.
+        /// </summary>
+        /// <param name="view">The view.</param>
+        public HeatAlgorithm(ISeriesView view) : base(view)
+        {
+            PreferredSelectionMode = TooltipSelectionMode.OnlySender;
+        }
+
+        /// <summary>
+        /// Updates this instance.
+        /// </summary>
+        /// <exception cref="LiveCharts.Helpers.LiveChartsException">There is no a valid gradient to create a heat series.</exception>
+        public override void Update()
+        {
+            var heatSeries = (IHeatSeriesView)View;
+
+            var uw = new CorePoint(
+                0 * ChartFunctions.GetUnitWidth(AxisOrientation.X, Chart, View.ScalesXAt) / 2,
+                -ChartFunctions.GetUnitWidth(AxisOrientation.Y, Chart, View.ScalesYAt));
+
+            // ReSharper disable once CompareOfFloatsByEqualityOperator
+            var wd = CurrentXAxis.TopLimit - CurrentXAxis.BotLimit == 0
+                ? double.MaxValue
+                : CurrentXAxis.TopLimit - CurrentXAxis.BotLimit;
+            // ReSharper disable once CompareOfFloatsByEqualityOperator
+            var hd = CurrentYAxis.TopLimit - CurrentYAxis.BotLimit == 0
+                ? double.MaxValue
+                : CurrentYAxis.TopLimit - CurrentYAxis.BotLimit;
+            var w = Chart.DrawMargin.Width / wd;
+            var h = Chart.DrawMargin.Height / hd;
+
+            //lets force the gradients to always have an 'interpol-able' model
+
+            if (!heatSeries.Stops.Any())
+                throw new LiveChartsException("There is no a valid gradient to create a heat series.");
+
+            var correctedGradients = heatSeries.Stops.Select(x => new CoreGradientStop
+            {
+                Color = x.Color,
+                Offset = x.Offset < 0 ? 0 : (x.Offset > 1 ? 1 : x.Offset)
+            }).ToList();
+            var min = correctedGradients[0];
+            min.Offset = 0;
+            correctedGradients.Insert(0, min);
+            var max = correctedGradients[correctedGradients.Count - 1];
+            max.Offset = 1;
+            correctedGradients.Add(max);
+
+            foreach (var chartPoint in View.ActualValues.GetPoints(View))
+            {
+                chartPoint.ChartLocation = ChartFunctions.ToDrawMargin(
+                    chartPoint, View.ScalesXAt, View.ScalesYAt, Chart) + uw;
+
+                chartPoint.SeriesView = View;
+
+                chartPoint.View = View.GetPointView(chartPoint,
+                    View.DataLabels ? View.GetLabelPointFormatter()(chartPoint) : null);
+
+                var heatView = (IHeatPointView)chartPoint.View;
+
+                heatView.ColorComponents = ColorInterpolation(correctedGradients,
+                    (chartPoint.Weight - Chart.WLimit.Min)/(Chart.WLimit.Max - Chart.WLimit.Min));
+
+                heatView.Width = w;
+                heatView.Height = h;
+
+                chartPoint.View.DrawOrMove(null, chartPoint, 0, Chart);
+            }
+        }
+
+        /// <summary>
+        /// Gets the minimum x.
+        /// </summary>
+        /// <param name="axis">The axis.</param>
+        /// <returns></returns>
+        public double GetMinX(AxisCore axis)
+        {
+            return AxisLimits.StretchMin(axis);
+        }
+
+        /// <summary>
+        /// Gets the maximum x.
+        /// </summary>
+        /// <param name="axis">The axis.</param>
+        /// <returns></returns>
+        public double GetMaxX(AxisCore axis)
+        {
+            return AxisLimits.StretchMax(axis) + 1;
+        }
+
+        /// <summary>
+        /// Gets the minimum y.
+        /// </summary>
+        /// <param name="axis">The axis.</param>
+        /// <returns></returns>
+        public double GetMinY(AxisCore axis)
+        {
+            return AxisLimits.StretchMin(axis);
+        }
+
+        /// <summary>
+        /// Gets the maximum y.
+        /// </summary>
+        /// <param name="axis">The axis.</param>
+        /// <returns></returns>
+        public double GetMaxY(AxisCore axis)
+        {
+            return AxisLimits.StretchMax(axis) + 1;
+        }
+
+        private static CoreColor ColorInterpolation(IList<CoreGradientStop> gradients, double weight)
+        {
+            CoreColor from = new CoreColor(0, 0, 0, 0), to = new CoreColor(0, 0, 0, 0);
+            double fromOffset = 0, toOffset = 0;
+
+            for (var i = 0; i < gradients.Count; i++)
+            {
+                // ReSharper disable once InvertIf
+                if (double.IsNaN(weight) || gradients[i].Offset <= weight && gradients[i + 1].Offset >= weight)
+                {
+                    from = gradients[i].Color;
+                    to = gradients[i + 1].Color;
+
+                    fromOffset = gradients[i].Offset;
+                    toOffset = gradients[i + 1].Offset;
+
+                    break;
+                }
+            }
+
+            return new CoreColor(
+                InterpolateColorComponent(from.A, to.A, fromOffset, toOffset, weight),
+                InterpolateColorComponent(from.R, to.R, fromOffset, toOffset, weight),
+                InterpolateColorComponent(from.G, to.G, fromOffset, toOffset, weight),
+                InterpolateColorComponent(from.B, to.B, fromOffset, toOffset, weight));
+        }
+
+        private static byte InterpolateColorComponent(byte fromComponent, byte toComponent,
+            double fromOffset, double toOffset, double value)
+        {
+            if (fromComponent == toComponent)
+            {
+                return fromComponent;
+            }
+            else
+            {
+                var deltaX = toOffset - fromOffset;
+                // ReSharper disable once CompareOfFloatsByEqualityOperator
+                var m = (toComponent - fromComponent) / (deltaX == 0 ? double.MinValue : deltaX);
+
+                return (byte)(m * (value - fromOffset) + fromComponent);
+            }
+        }
+    }
+}