Hey @Benny121221, this is an excellent improvement! By adding support for Y offsets you enabled a whole new type of plot type (a waterfall plot).

This one-liner is super useful for creating waterfall plots from a series of Y values.

double[] yOffsets = Enumerable.Range(0, pointCount).Select(count => ys.Take(count).Sum()).ToArray();

What do you think about adding a little function which runs that line under the hood to create the waterfall plot so the user doesn't have to? Something like this (where most of the arguments taken are simply passed to PlotBar):

plt.PlotWaterfall(xs, ys);

Such a method could accept arguments (preferably not delegates though) to customize coloring, and not require modification of the PlotBar method. Perhaps something like:

plt.PlotWaterfall(xs, ys, Color.Green, Color.Red);

What do you think about adding a little function which runs that line under the hood to create the waterfall plot so the user doesn't have to? Something like this (where most of the arguments taken are simply passed to PlotBar):

plt.PlotWaterfall(xs, ys);

I like it, I am busy today but I'll certainly work on this when i get home or in the coming days.

I like it, I am busy today but I'll certainly work on this when i get home or in the coming days.

Sounds like a plan!

I added your suggestions, it looks like this:

The demo code is the following:

// generate random data to plot

Random rand = new Random(0);
int pointCount = 12;
double[] xs = DataGen.Consecutive(pointCount);
double[] ys = DataGen.RandomNormal(rand, pointCount, 5, 10);

System.Drawing.Color profitColor = System.Drawing.Color.Green;
System.Drawing.Color lossColor = System.Drawing.Color.Red;
string[] monthNames = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };

plt.PlotWaterfall(xs, ys, fillColor: profitColor, negativeColor: lossColor);
plt.Title("Y1 Profits");
plt.XLabel("Month");
plt.XTicks(monthNames);
plt.YLabel("Million USD");

The negativeColor parameter has been added to PlotBar as well, and a user can still manually set yOffsets with PlotBar should they wish.