public Guid UpdateHeatmapOverlayHeatPoints(Guid token, HeatPoint[] heatPoints)
{
foreach (HeatPoint h in heatPoints) h.Intensity = HeatmapSettings.DEFAULT_INTENSITY;
var cacheObject = HeatmapSettingsCache.Instance.Retrieve(token);
cacheObject.HeatPoints = new HeatPointList(heatPoints);
return HeatmapSettingsCache.Instance.Store(token, cacheObject);
}
public void ScaleTests()
{
HeatPoint h1 = new HeatPoint(39, -104);
HeatPoint h2 = new HeatPoint(38, -105);
Assert.AreEqual(69*2, HeatPoint.GetPixelHeight(h1, h2, 2));
Assert.AreEqual(107, HeatPoint.GetPixelWidth(h1, h2, 2));
}
private void AppendToStringBuilder(StringBuilder sb, HeatPoint hp)
{
sb.Append("[");
sb.Append(hp.X.ToString());
sb.Append("x");
sb.Append(hp.Y.ToString());
sb.Append("]");
sb.Append(",");
}
public void IntensityAssignmentIsConsistent()
{
HeatPoint hp = new HeatPoint(39, 104, 50);
for (var i = 0; i <=100; i++)
{
hp.Intensity = i;
Assert.AreEqual(i, hp.Intensity);
}
}
public Guid GenerateHeatMapOverlayToken(HeatPoint[] heatPoints, HeatmapSettings settings)
{
//until javascript sets the intensity on each point, it comes through as 0, which renders transparent
//this sets the intensity to the default intensity so the heat points render with color
foreach (HeatPoint h in heatPoints) h.Intensity = HeatmapSettings.DEFAULT_INTENSITY;
// for now, force each of the tile images to have a border with the Border = true setting
if (null == settings) settings = new HeatmapSettings() {Border = true};
var cacheObject = new HeatmapSettingsCache.SettingsCacheObject(settings, new HeatPointList(heatPoints));
return HeatmapSettingsCache.Instance.Store(cacheObject);
}
public void PixelWidthTest()
{
HeatPoint h1 = new HeatPoint(39, -104);
HeatPoint h2 = new HeatPoint(38, -105);
double width = HeatPoint.GetPixelWidth(h1, h2, 1);
Assert.AreEqual(53, width);
h1 = new HeatPoint(39, -104);
h2 = new HeatPoint(39, -104);
Assert.AreEqual(0, HeatPoint.GetPixelWidth(h1, h2, 1));
h1 = new HeatPoint(39, -104);
h2 = new HeatPoint(39, -106);
Assert.AreEqual(53.5*2, HeatPoint.GetPixelWidth(h1, h2, 1));
}
public void PixelHeightTest()
{
HeatPoint h1 = new HeatPoint(39, -104);
HeatPoint h2 = new HeatPoint(38, -105);
double height = HeatPoint.GetPixelHeight(h1, h2, 1);
Assert.AreEqual(69, height);
h1 = new HeatPoint(39, -104);
h2 = new HeatPoint(39, -104);
Assert.AreEqual(0, HeatPoint.GetPixelHeight(h1, h2, 1));
h1 = new HeatPoint(39, -104);
h2 = new HeatPoint(37, -104);
Assert.AreEqual(69*2, HeatPoint.GetPixelHeight(h1, h2, 1));
}
private void DrawHeatPoint(Graphics canvas, HeatPoint heatPoint, int radius)
{
// Create points generic list of points to hold circumference points
List<Point> CircumferencePointsList = new List<Point>();
// Create an empty point to predefine the point struct used in the circumference loop
Point CircumferencePoint;
// Create an empty array that will be populated with points from the generic list
Point[] CircumferencePointsArray;
// Calculate ratio to scale byte intensity range from 0-255 to 0-1
float fRatio = 1F / Byte.MaxValue;
// Precalulate half of byte max value
byte bHalf = Byte.MaxValue / 2;
// Flip intensity on it's center value from low-high to high-low
int iIntensity = (byte)(heatPoint.Intensity - ((heatPoint.Intensity - bHalf) * 2));
// Store scaled and flipped intensity value for use with gradient center location
float fIntensity = iIntensity * fRatio;
// Loop through all angles of a circle
// Define loop variable as a double to prevent casting in each iteration
// Iterate through loop on 10 degree deltas, this can change to improve performance
for (double i = 0; i <= 360; i += 10)
{
// Replace last iteration point with new empty point struct
CircumferencePoint = new Point();
// Plot new point on the circumference of a circle of the defined radius
// Using the point coordinates, radius, and angle
// Calculate the position of this iterations point on the circle
CircumferencePoint.X = Convert.ToInt32(heatPoint.X + radius * Math.Cos(ConvertDegreesToRadians(i)));
CircumferencePoint.Y = Convert.ToInt32(heatPoint.Y + radius * Math.Sin(ConvertDegreesToRadians(i)));
// Add newly plotted circumference point to generic point list
CircumferencePointsList.Add(CircumferencePoint);
}
// Populate empty points system array from generic points array list
// Do this to satisfy the datatype of the PathGradientBrush and FillPolygon methods
CircumferencePointsArray = CircumferencePointsList.ToArray();
// Create new PathGradientBrush to create a radial gradient using the circumference points
PathGradientBrush GradientShaper = new PathGradientBrush(CircumferencePointsArray);
// Create new color blend to tell the PathGradientBrush what colors to use and where to put them
ColorBlend GradientSpecifications = new ColorBlend(3);
// Define positions of gradient colors, use intesity to adjust the middle color to
// show more mask or less mask
GradientSpecifications.Positions = new float[3] { 0, fIntensity, 1 };
// Define gradient colors and their alpha values, adjust alpha of gradient colors to match intensity
GradientSpecifications.Colors = new Color[3] { Color.FromArgb(0, Color.White), Color.FromArgb(heatPoint.Intensity, Color.Black), Color.FromArgb(heatPoint.Intensity, Color.Black) };
// Pass off color blend to PathGradientBrush to instruct it how to generate the gradient
GradientShaper.InterpolationColors = GradientSpecifications;
// Draw polygon (circle) using our point array and gradient brush
canvas.FillPolygon(GradientShaper, CircumferencePointsArray);
}
public static int GetPixelWidth(HeatPoint h1, HeatPoint h2, double scale)
{
return (int)( scale * GetDistance(h1.Latitude, h1.Latitude, h2.Longitude, h1.Longitude));
}
public static int GetPixelWidth(HeatPoint h1, HeatPoint h2)
{
return GetPixelWidth(h1, h2, 1);
}
public static int GetPixelHeight(HeatPoint h1, HeatPoint h2)
{
return GetPixelHeight(h1, h2, 1);
}