59 lines
1.8 KiB
Zig
59 lines
1.8 KiB
Zig
// This file is part of river, a dynamic tiling wayland compositor.
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//
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// Copyright 2023 The River Developers
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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const std = @import("std");
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const math = std.math;
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const wlr = @import("wlroots");
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const Vector = @This();
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x: i32,
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y: i32,
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pub fn positionOfBox(box: wlr.Box) Vector {
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return .{
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.x = box.x + @divFloor(box.width, 2),
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.y = box.y + @divFloor(box.height, 2),
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};
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}
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/// Returns the difference between two vectors.
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pub fn diff(a: Vector, b: Vector) Vector {
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return .{
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.x = b.x - a.x,
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.y = b.y - a.y,
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};
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}
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/// Returns the direction of the vector.
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pub fn direction(self: Vector) ?wlr.OutputLayout.Direction {
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// A zero length vector has no direction
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if (self.x == 0 and self.y == 0) return null;
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if ((math.absInt(self.y) catch return null) > (math.absInt(self.x) catch return null)) {
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// Careful: We are operating in a Y-inverted coordinate system.
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return if (self.y > 0) .down else .up;
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} else {
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return if (self.x > 0) .right else .left;
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}
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}
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/// Returns the length of the vector.
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pub fn length(self: Vector) u31 {
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return math.sqrt(@as(u31, @intCast((self.x *| self.x) +| (self.y *| self.y))));
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}
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