Category:Heat Map: Difference between revisions

namespace TPG.GeoFramework.HeatMapLayer
{
    /// <summary>
    /// View model for general heat maps
    /// </summary>
    public interface IHeatMapLayerViewModel:IGeoLayerViewModel
    {
        /// <summary>
        /// Heat map data is organized in HeatMapGroups. Each group contains clusters of heat map data.
        /// Separate settings and color palettes can be set for each group.
        /// Note that the heat map property setters are applied to both default settings and to all groups.
        /// For detailed, individual group settings control, access elements in the HeatMapGroups directly
        /// </summary>
        ObservableCollection<HeatMapGroup> HeatMapGroups { get; }
        
        /// <summary>
        /// HeatMapSettings contain global settings and a default group setting that
        /// is used when no settings are available for a heat map group.
        /// </summary>
        HeatMapSettings HeatMapSettings { get; }
        
        /// <summary>
        /// Sets kernel radius unit (meters or pixels)
        /// </summary>
        KernelRadiusUnitEnum KernelRadiusUnit { get; set; }

        /// <summary>
        /// Kernel radius, unit controlled by KernelRadiusUnit
        /// </summary>
        UInt32 KernelRadius { get; set; }

        /// <summary>
        /// Sets kernel shape. The kernel shape controls how values are smoothed in the HeatMap.
        /// See https://en.wikipedia.org/wiki/Kernel_(statistics)#Kernel_functions_in_common_use
        /// </summary>
        KernelShapeEnum KernelShape { get; set; }

        /// <summary>
        /// Max pixel radius used when applying kernel. This is relevant when setting the kernel unit to "meters"
        /// and is used to limit demanding calculations
        /// </summary>
        double MaxPixelRadius { get; set; }
        
        /// <summary>
        /// Multiplier is applied to all values prior to applying the kernel
        /// </summary>
        double ValueScale { get; set; }
        
        /// <summary>
        /// Smaller grid cell sizes yield higher quality heat maps. Larger grid cell sizes are quicker. Typical range is 1-10. 
        /// </summary>
        int GridCellSize { get; set; }
    }
}

public static HeatMapGroup CreateTestGroup(string fileName)
{
    PositionGroupCollection testData;
    using (var stream = File.Open(fileName, FileMode.Open))
        testData = PositionGroupCollection.Parser.ParseFrom(stream);

    var result = new HeatMapGroup
    {
        Settings = new HeatMapGroupSettings {KernelShape = KernelShapeEnum.Triweight},
        Name = !string.IsNullOrWhiteSpace(testData.Name) ? testData.Name : NameFromFileName(fileName)
    };

    foreach (var item in testData.PositionGroups)
    {
        var hdi = new HeatMapItemData
        {
            Id = item.Name,
            GeoData = new HeatMapGeoData(item.Positions.Select(a => new GeoPos(a.Lat, a.Lon)).ToArray())
        };
        result.Add(hdi.Id, hdi);
    }
    return result;
}