119 lines
3.4 KiB
Zig
119 lines
3.4 KiB
Zig
const std = @import("std");
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const vaxis = @import("vaxis");
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const Cell = vaxis.Cell;
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const Event = union(enum) {
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key_press: vaxis.Key,
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winsize: vaxis.Winsize,
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};
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pub const panic = vaxis.panic_handler;
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer {
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const deinit_status = gpa.deinit();
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//fail test; can't try in defer as defer is executed after we return
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if (deinit_status == .leak) {
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std.log.err("memory leak", .{});
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}
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}
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const alloc = gpa.allocator();
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var tty = try vaxis.Tty.init();
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defer tty.deinit();
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var vx = try vaxis.init(alloc, .{});
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defer vx.deinit(alloc, tty.anyWriter());
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var loop: vaxis.Loop(Event) = .{ .tty = &tty, .vaxis = &vx };
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try loop.init();
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try loop.start();
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defer loop.stop();
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try vx.enterAltScreen(tty.anyWriter());
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try vx.queryTerminal(tty.anyWriter(), 1 * std.time.ns_per_s);
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try vx.queryColor(tty.anyWriter(), .fg);
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try vx.queryColor(tty.anyWriter(), .bg);
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var pct: u8 = 0;
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var dir: enum {
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up,
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down,
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} = .up;
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const fg = [_]u8{ 192, 202, 245 };
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const bg = [_]u8{ 26, 27, 38 };
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// block until we get a resize
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while (true) {
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const event = loop.nextEvent();
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switch (event) {
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.key_press => |key| if (key.matches('c', .{ .ctrl = true })) return,
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.winsize => |ws| {
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try vx.resize(alloc, tty.anyWriter(), ws);
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break;
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},
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}
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}
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while (true) {
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while (loop.tryEvent()) |event| {
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switch (event) {
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.key_press => |key| if (key.matches('c', .{ .ctrl = true })) return,
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.winsize => |ws| try vx.resize(alloc, tty.anyWriter(), ws),
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}
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}
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const win = vx.window();
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win.clear();
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const color = try blendColors(bg, fg, pct);
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const style: vaxis.Style = .{ .fg = color };
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const segment: vaxis.Segment = .{
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.text = vaxis.logo,
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.style = style,
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};
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const center = vaxis.widgets.alignment.center(win, 28, 4);
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_ = try center.printSegment(segment, .{ .wrap = .grapheme });
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try vx.render(tty.anyWriter());
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std.time.sleep(16 * std.time.ns_per_ms);
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switch (dir) {
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.up => {
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pct += 1;
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if (pct == 100) dir = .down;
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},
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.down => {
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pct -= 1;
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if (pct == 0) dir = .up;
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},
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}
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}
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}
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/// blend two rgb colors. pct is an integer percentage for te portion of 'b' in
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/// 'a'
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fn blendColors(a: [3]u8, b: [3]u8, pct: u8) !vaxis.Color {
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// const r_a = (a[0] * (100 -| pct)) / 100;
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const r_a = (@as(u16, a[0]) * @as(u16, (100 -| pct))) / 100;
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const r_b = (@as(u16, b[0]) * @as(u16, pct)) / 100;
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const g_a = (@as(u16, a[1]) * @as(u16, (100 -| pct))) / 100;
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const g_b = (@as(u16, b[1]) * @as(u16, pct)) / 100;
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// const g_a = try std.math.mul(u8, a[1], (100 -| pct) / 100);
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// const g_b = (b[1] * pct) / 100;
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const b_a = (@as(u16, a[2]) * @as(u16, (100 -| pct))) / 100;
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const b_b = (@as(u16, b[2]) * @as(u16, pct)) / 100;
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// const b_a = try std.math.mul(u8, a[2], (100 -| pct) / 100);
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// const b_b = (b[2] * pct) / 100;
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return .{ .rgb = [_]u8{
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@min(r_a + r_b, 255),
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@min(g_a + g_b, 255),
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@min(b_a + b_b, 255),
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} };
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}
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