hadean-zig/src/geometry/Recti.zig

const Vec2i = @import("./Vec2i.zig");
const Vec2f = @import("./Vec2f.zig");
const Rectf = @import("./Rectf.zig");
const std = @import("std");

const Recti = @This();

x: i32,
y: i32,
w: i32,
h: i32,
a: Vec2i,
b: Vec2i,

pub fn from_xywh(x: i32, y: i32, w: i32, h: i32) Recti {
	return .{
		.x = x,
		.y = y,
		.w = w,
		.h = h,
		.a = Vec2i.create(x, y),
		.b = Vec2i.create(x + w, y + h),
	};
}

pub fn from_ab(a: Vec2i, b: Vec2i) Recti {
	const tlx = @min(a.x, b.x);
	const tly = @min(a.y, b.y);
	const brx = @max(a.x, b.x);
	const bry = @max(a.y, b.y);
	const width = brx - tlx;
	const height = bry - tly;
	return .{
		.x = tlx,
		.y = tly,
		.w = width,
		.h = height,
		.a = Vec2i.create(tlx, tly),
		.b = Vec2i.create(brx, bry),
	};
}

pub fn to_rectf(self: *const Recti) Rectf {
	return Rectf.from_xywh(
		@intCast(self.x),
		@intCast(self.y),
		@intCast(self.w),
		@intCast(self.h),
	);
}

pub fn scalef(self: *const Recti, scale: Vec2f) Rectf {
	return Rectf.from_xywh(
		@as(f32, @floatFromInt(self.x)) / scale.x,
		@as(f32, @floatFromInt(self.y)) / scale.y,
		@as(f32, @floatFromInt(self.w)) / scale.x,
		@as(f32, @floatFromInt(self.h)) / scale.y,
	);
}