how to generate heat maps given the points

Question

I want to generate a heat map in windows form. I have a set of points as the input. How to go about doing this in the simplest way? Thanks.

Answer 1

Divide the surface up into a grid of cells, and count the points inside each cell.

Given the count of points, calculate a color for each cell

Answer 2

This worked well for me.

public Color HeatMap(float value, float max)
    {
        int r, g, b;
        float val = value / max; // Assuming that range starts from 0
        if (val > 1)
            val = 1;
        if (val > 0.5f)
        {
            val = (val - 0.5f) * 2;
            r = Convert.ToByte(255 * val);
            g = Convert.ToByte(255 * (1 - val));
            b = 0;
        }
        else
        {
            val = val * 2;
            r = 0;
            g = Convert.ToByte(255 * val);
            b = Convert.ToByte(255 * (1 - val));
        }
        return Color.FromArgb(255, r, g, b);
    }