libvaxis/examples/pathological.zig

const std = @import("std");
const vaxis = @import("vaxis");
const Cell = vaxis.Cell;

const log = std.log.scoped(.main);

const Event = union(enum) {
    winsize: vaxis.Winsize,
};

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    const alloc = gpa.allocator();
    var vx = try vaxis.init(alloc, .{});
    defer vx.deinit(alloc);

    var loop: vaxis.Loop(Event) = .{ .vaxis = &vx };

    try loop.run();
    defer loop.stop();
    try vx.enterAltScreen();
    try vx.queryTerminal();

    while (true) {
        const event = loop.nextEvent();
        switch (event) {
            .winsize => |ws| {
                try vx.resize(alloc, ws);
                break;
            },
        }
    }

    const timer_start = std.time.microTimestamp();
    var iter: usize = 0;
    while (iter < 10_000) : (iter += 1) {
        const win = vx.window();
        const child = win.initChild(0, 0, .{ .limit = 20 }, .{ .limit = 20 });
        win.clear();
        var row: usize = 0;
        while (row < child.height) : (row += 1) {
            var col: usize = 0;
            while (col < child.width) : (col += 1) {
                child.writeCell(col, row, .{
                    .char = .{
                        .grapheme = " ",
                        .width = 1,
                    },
                    .style = .{
                        .bg = .{ .index = @truncate(col + iter) },
                    },
                });
            }
        }
        try vx.render();
    }
    try vx.exitAltScreen();
    const took = std.time.microTimestamp() - timer_start;
    const stdout = std.io.getStdOut().writer();
    try stdout.print("\r\ntook {d}ms to render 10,000 times\r\n", .{@divTrunc(took, std.time.us_per_ms)});
}