View Limit: Improve pan/zoom behavior (4.1 vs 4.0)

[at2software]

The AxisBounds() method from v4.0.48 seems to have been replaced by SetViewLimits() in v4.1.x. However, upon dragging, the new method now automatically scales / zooms. If exaggerated, this might result in an invalid axis in below example.

Can the old AxisBounds() behaviour be mimicked in v4.1.x?

We have this code in v4.0.48

double[] data = new double[35];
Random rand = new Random(0);
for (int i = 1; i < data.Length; i++)
	data[i] = data[i - 1] + rand.NextDouble() - .5;

plot1.plt.PlotSignal(data);
plot1.plt.AxisBounds(minY: 0);
plot1.Render();

And adapted the last 3 lines to v4.1.16 like this:

plot1.Plot.AddSignal(data);
plot1.Plot.SetViewLimits(yMin: 0);
plot1.Render();

In v4.0.48, the plot can be dragged upwards, as long as there is allowed space available, but stops at y=0.
SetViewLimits from v4.1.16 behaves similarly, but when the y=0 limit is hit, the graph gets scaled vertically (and, if exaggerated, the y-axis seems to be broken or flipped / inverted).

Here's a screencap of the behaviours:

2021-07-07_14_05_14_axpt.mp4

[swharden]

Thanks for reporting this @at2software! Your description and videos were excellent

I was able to recreate the issue with a (failing) test, then correct it. This will be fixed in the next NuGet release 👍🚀

double[] values = DataGen.RandomWalk(new Random(0), 100);
formsPlot1.Plot.AddSignal(values);
formsPlot1.Plot.SetViewLimits(yMin: 0);

before	after

[at2software]

Great, thanks a lot!