Add vanilla PlotLines binding

[taylorh140]

I couldn't figure out how to call this function from the imgui gui side.

[taylorh140]

I just used the plot library instead

[Logickin-Lambda]

@taylorh140 Are they really the same? This is because I just want to plot some waves rather than plotting a chart, but I am not sure how much additional overheads with using this library instead of using the built-in PlotLines.

I think this issues should be opened because it doesn't really address the missing PlotLines function compared to the original imgui library, but a workaround that works similarly yet possibly not exact. Unless I am wrong about the built-in Plot Library.

[taylorh140]

@Logickin-Lambda
I think they use the same drawing primitives to build up the plot. However, the basic ones are possibly a bit more efficient, since they have less features. But if you want to know you'll have to benchmark them for your system. ( ദ്ദി ˙ᗜ˙ )

[Logickin-Lambda]

@taylorh140 Yeah, I think it is the time to pull out a test for it. Considering with the current solution:

        // The Vanilla "PlotLines" function doesn't exist in zgui, use the implot as a temporary solutions
        zgui.plot.pushStyleVar2f(.{ .idx = .plot_padding, .v = .{ 0, 0 } });
        if (zgui.plot.beginPlot("Samples", .{ .h = 240, .w = 100, .flags = DefaultPlotFlag })) { // setting size to -1 enables auto sizing
            zgui.plot.setupAxis(.x1, .{ .flags = DefaultAxisFlag });
            zgui.plot.setupAxis(.y1, .{ .flags = DefaultAxisFlag });
            zgui.plot.setupAxisLimits(.x1, .{ .min = -1, .max = 1 });
            zgui.plot.setupAxisLimits(.y1, .{ .min = 0, .max = 100 });

            // Trying to plot a vertical wave since it is more useful for my use case
            zgui.plot.plotLine("vertical sample", f32, .{ .xv = &samples, .yv = &time });
            zgui.plot.endPlot();
        }
        zgui.plot.popStyleVar(.{});

Comparing to this theoretical PlotLines function for zig:

zgui.plotLines("Samples," samples, 100);

The later is much more simpler and without all the flag configuration for every iterations and the implementation is less noisy, which is good for showing some waveform on a synth or doing simple and plain oscilloscopes; however, if you see my former example, I did intended to print a vertical chart drawing the wave from top to bottom, so there is a chance that I have to use ImPlot instead of the native function which it seemingly only offers drawing chart from left to right.

I might try to fork this repo and try to add that function for testing, but there is no guarantee I will do this shortly because I am still very new in this library and imgui in general which I need some time to understand how it works.