126 lines
3.8 KiB
Markdown
126 lines
3.8 KiB
Markdown
# zgui v0.9.4 - dear imgui bindings
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Easy to use, hand-crafted API with default arguments, named parameters and Zig style text formatting. For a test application please see [here](https://github.com/michal-z/zig-gamedev/tree/main/samples/gui_test_wgpu).
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## Features
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* Most public dear imgui API exposed
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* All memory allocations go through user provided Zig allocator
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* [DrawList API](#drawlist-api) for vector graphics, text rendering and custom widgets
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* [Plot API](#plot-api) for advanced data visualizations
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## Getting started
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Copy `zgui` folder to a `libs` subdirectory of the root of your project.
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To get glfw/wgpu rendering backend working also copy `zgpu`, `zglfw` and `zpool` folders (see [zgpu](https://github.com/michal-z/zig-gamedev/tree/main/libs/zgpu) for the details). Alternatively, you can provide your own rendering backend, see: [backend_glfw_wgpu.zig](src/backend_glfw_wgpu.zig) for an example.
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Then in your `build.zig` add:
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```zig
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const zgui = @import("libs/zgui/build.zig");
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// Needed for glfw/wgpu rendering backend
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const zglfw = @import("libs/zglfw/build.zig");
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const zgpu = @import("libs/zgpu/build.zig");
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const zpool = @import("libs/zpool/build.zig");
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pub fn build(b: *std.build.Builder) void {
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...
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const zgui_options = zgui.BuildOptionsStep.init(b, .{ .backend = .glfw_wgpu });
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const zgui_pkg = zgui.getPkg(&.{zgui_options.getPkg()});
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exe.addPackage(zgui_pkg);
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zgui.link(exe, zgui_options);
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// Needed for glfw/wgpu rendering backend
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const zgpu_options = zgpu.BuildOptionsStep.init(b, .{});
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const zgpu_pkg = zgpu.getPkg(&.{ zgpu_options.getPkg(), zpool.pkg, zglfw.pkg });
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exe.addPackage(zglfw.pkg);
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exe.addPackage(zgpu_pkg);
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zglfw.link(exe);
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zgpu.link(exe, zgpu_options);
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}
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```
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Now in your code you may import and use `zgui`:
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```zig
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const zgui = @import("zgui");
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zgui.init(allocator);
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_ = zgui.io.addFontFromFile(content_dir ++ "Roboto-Medium.ttf", 16.0);
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zgui.backend.init(
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window,
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demo.gctx.device,
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@enumToInt(swapchain_format),
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);
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```
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```zig
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// Main loop
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while (...) {
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zgui.backend.newFrame(framebuffer_width, framebuffer_height);
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zgui.bulletText(
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"Average : {d:.3} ms/frame ({d:.1} fps)",
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.{ demo.gctx.stats.average_cpu_time, demo.gctx.stats.fps },
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);
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zgui.bulletText("W, A, S, D : move camera", .{});
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zgui.spacing();
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if (zgui.button("Setup Scene", .{})) {
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// Button pressed.
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}
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if (zgui.dragFloat("Drag 1", .{ .v = &value0 })) {
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// value0 has changed
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}
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if (zgui.dragFloat("Drag 2", .{ .v = &value0, .min = -1.0, .max = 1.0 })) {
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// value1 has changed
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}
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// Setup wgpu render pass here
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zgui.backend.draw(pass);
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}
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```
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### DrawList API
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```zig
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draw_list.addQuad(.{
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.p1 = .{ 170, 420 },
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.p2 = .{ 270, 420 },
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.p3 = .{ 220, 520 },
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.p4 = .{ 120, 520 },
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.col = 0xff_00_00_ff,
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.thickness = 3.0,
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});
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draw_list.addText(.{ 130, 130 }, 0xff_00_00_ff, "The number is: {}", .{7});
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draw_list.addCircleFilled(.{ .p = .{ 200, 600 }, .r = 50, .col = 0xff_ff_ff_ff });
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draw_list.addCircle(.{ .p = .{ 200, 600 }, .r = 30, .col = 0xff_00_00_ff, .thickness = 11 });
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draw_list.addPolyline(
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&.{ .{ 100, 700 }, .{ 200, 600 }, .{ 300, 700 }, .{ 400, 600 } },
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.{ .col = 0xff_00_aa_11, .thickness = 7 },
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);
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```
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### Plot API
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```zig
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if (zgui.plot.beginPlot("Line Plot", .{ .h = -1.0 })) {
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zgui.plot.setupAxis(.x1, .{ .label = "xaxis" });
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zgui.plot.setupAxisLimits(.x1, .{ .min = 0, .max = 5 });
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zgui.plot.setupLegend(.{ .south = true, .west = true }, .{});
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zgui.plot.setupFinish();
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zgui.plot.plotLineValues("y data", i32, .{ .v = &.{ 0, 1, 0, 1, 0, 1 } });
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zgui.plot.plotLine("xy data", f32, .{
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.xv = &.{ 0.1, 0.2, 0.5, 2.5 },
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.yv = &.{ 0.1, 0.3, 0.5, 0.9 },
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});
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zgui.plot.endPlot();
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}
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```
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