Added plotLines() and plotHistogram()

[Logickin-Lambda]

Because of the issue Add vanilla PlotLines binding by taylorh140 while I have use cases with the native plot functions, I have studied the library to see how to enable these functions. With extended the zgui.cpp and gui.zig, I have successfully enable these to functions as shown:

The inconsistent plot size is intentional because I was also trying to change the properties passed with a newly created struct named PlotNative used for the two plot functions; thus, the function call should aligns the conventions of other existing function as shown:

// plotLines(label: [*:0]const u8, args: PlotNative)
// plotHistogram(label: [*:0]const u8, args: PlotNative)

zgui.plotLines("First Plot", .{ .v = &samples, .v_count = samples.len, .graph_size = .{ 0, 80 }, .overlay = "testing" });
zgui.plotLines("First small", .{ .v = &sample_small, .v_count = 7, .graph_size = .{ 240, 80 } });
zgui.plotHistogram("First Hist", .{ .v = &samples, .v_count = 100, .graph_size = .{ 0, 80 }, .overlay = "Another Label" });
zgui.plotHistogram("Hist small", .{ .v = &sample_small, .v_count = sample_small.len, .scale_min = 0, .graph_size = .{ 120, 80 } });

However, this is my first contribution, so please let me know if I have done a pull request properly.

[Copilot]

Pull Request Overview

This PR adds support for ImGui's PlotLines and PlotHistogram functions to the zgui wrapper library. The implementation provides Zig bindings for native plot functionality that was previously unavailable.

• Added C++ wrapper functions zguiPlotLines and zguiPlotHistogram in zgui.cpp
• Created Zig bindings with a PlotNative struct for consistent parameter passing
• Exposed public plotLines and plotHistogram functions following library conventions

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/zgui.cpp	Added C++ wrapper functions for ImGui::PlotLines and ImGui::PlotHistogram
src/gui.zig	Added PlotNative struct and Zig bindings for the new plot functions

Comments suppressed due to low confidence (3)

src/gui.zig:1833

• The field name 'v' is unclear and non-descriptive. Consider renaming it to 'values' to improve code readability and match the corresponding C++ parameter name.

    v: [*]f32,

src/gui.zig:1834

• The field name 'v_count' should be renamed to 'values_count' for consistency with the 'values' field name and to improve clarity.

    v_count: c_int,

src/gui.zig:1835

• The field name 'v_offset' should be renamed to 'values_offset' for consistency with other field names and to improve clarity.

    v_offset: c_int = 0,

[Copilot]

[nitpick] The struct name 'PlotNative' is ambiguous and doesn't clearly indicate its purpose. Consider renaming it to 'PlotArgs' or 'PlotOptions' to better reflect that it contains plotting parameters.

Suggested change

	const PlotNative = struct {
	const PlotArgs = struct {

[hazeycode]

The bot is right. Let's use PlotArgs here for consistency.

[hazeycode]

Please revert this

[Logickin-Lambda]

Sure, seems I have missed that out when I was testing the library.

[Logickin-Lambda]

Done, I have made some changes according to the requests.

[hazeycode]

Thanks!

[Logickin-Lambda]

No worries, and thank you for maintaining the libraries too! Along with other libraries in the zig-gamedev, this really solves my huge headache on setting up the backend for imgui.