public HeatMap()
{
Points = new List <PointWithValue>();
Limits = new HeatMapLimits {
xMin = 0, xMax = 0, yMin = 0, yMax = 0
};
SetDefaultColors();
}
public Bitmap Draw()
{
Bitmap result = new Bitmap(Width, Height);
if (Limits.xMax == 0 && Limits.xMin == 0 && Limits.yMax == 0 && Limits.yMin == 0)
{
this.Limits = new HeatMapLimits {
xMin = 0, xMax = Width, yMin = 0, yMax = Height
};
}
var pointsWithDistance = new List <PointWithDistance>(Points.Count);
for (var i = 0; i < Points.Count; i++)
{
pointsWithDistance.Add(new PointWithDistance());
}
int x = Limits.xMin;
int y = Limits.yMin;
int w = Width;
int wy = w * y;
int pointsLimit = Points.Count;
int xStart = Limits.xMin;
int xEnd = Limits.xMax;
int yEnd = Limits.yMax;
bool isEmpty = true;
while (y < yEnd)
{
var val = GetPointValue(pointsLimit, new PointWithValue()
{
X = x, Y = y
}, pointsWithDistance);
if (val != -255)
{
isEmpty = false;
int imgX = x - Limits.xMin;
int imgY = y - Limits.yMin;
if (imgX < Width && imgY < Height && imgX >= 0 && imgY >= 0)
{
var col = GetRGBColor(val);
var imgCol = Color.FromArgb(col.A, col.R, col.G, col.B);
result.SetPixel(imgX, imgY, imgCol);
}
}
x = x + 1;
if (x > xEnd)
{
x = xStart;
y = y + 1;
wy = w * y;
}
}
if (isEmpty)
{
return(null);
}
return(result);
}