163 lines
3.6 KiB
Rust
163 lines
3.6 KiB
Rust
/*
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* meli
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*
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* Copyright 2017-2018 Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli 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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* meli 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 meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*!
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Simple type definitions and macro helper for a (x,y) position on the terminal and the areas they define.
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An `Area` consists of two points: the upper left and bottom right corners.
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*/
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/// A `(x, y)` position on screen.
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pub type Pos = (usize, usize);
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#[inline(always)]
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pub fn get_x(p: Pos) -> usize {
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p.0
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}
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#[inline(always)]
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pub fn get_y(p: Pos) -> usize {
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p.1
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}
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#[inline(always)]
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pub fn set_x(p: Pos, new_x: usize) -> Pos {
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(new_x, p.1)
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}
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#[inline(always)]
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pub fn set_y(p: Pos, new_y: usize) -> Pos {
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(p.0, new_y)
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}
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#[inline(always)]
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pub fn pos_inc(p: Pos, inc: (usize, usize)) -> Pos {
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(p.0 + inc.0, p.1 + inc.1)
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}
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#[inline(always)]
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pub fn pos_dec(p: Pos, dec: (usize, usize)) -> Pos {
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(p.0.saturating_sub(dec.0), p.1.saturating_sub(dec.1))
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}
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/// An `Area` consists of two points: the upper left and bottom right corners.
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///
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/// Example:
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/// ```
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/// # #[macro_use] extern crate ui; fn main() {
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/// use ui::*;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// # }
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/// ```
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pub type Area = (Pos, Pos);
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/// Get an area's height
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///
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/// Example:
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/// ```
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/// # #[macro_use] extern crate ui; fn main() {
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/// use ui::*;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// assert_eq!(height!(new_area), 1);
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/// # }
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/// ```
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#[macro_export]
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macro_rules! height {
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($a:expr) => {
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(get_y(bottom_right!($a))).saturating_sub(get_y(upper_left!($a)))
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};
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}
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/// Get an area's width
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///
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/// Example:
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/// ```
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/// # #[macro_use] extern crate ui; fn main() {
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/// use ui::*;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// assert_eq!(width!(new_area), 1);
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/// # }
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/// ```
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#[macro_export]
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macro_rules! width {
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($a:expr) => {
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(get_x(bottom_right!($a))).saturating_sub(get_x(upper_left!($a)))
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};
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}
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/// Get the upper left Position of an area
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///
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/// Example:
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/// ```
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/// # #[macro_use] extern crate ui; fn main() {
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/// use ui::*;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// assert_eq!(upper_left!(new_area), (0, 0));
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/// # }
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/// ```
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#[macro_export]
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macro_rules! upper_left {
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($a:expr) => {
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$a.0
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};
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}
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/// Get the bottom right Position of an area
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///
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/// Example:
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/// ```
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/// # #[macro_use] extern crate ui; fn main() {
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/// use ui::*;
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///
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/// let new_area = ((0, 0), (1, 1));
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/// assert_eq!(bottom_right!(new_area), (1, 1));
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/// # }
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/// ```
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#[macro_export]
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macro_rules! bottom_right {
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($a:expr) => {
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$a.1
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};
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}
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/// Check if area is valid.
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///
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/// Example:
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/// ```
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/// # #[macro_use] extern crate ui; fn main() {
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/// use ui::*;
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///
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/// let valid_area = ((0, 0), (1, 1));
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/// assert!(is_valid_area!(valid_area));
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///
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/// let invalid_area = ((2, 2), (1, 1));
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/// assert!(!is_valid_area!(invalid_area));
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/// # }
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///
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#[macro_export]
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macro_rules! is_valid_area {
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($a:expr) => {{
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let upper_left = upper_left!($a);
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let bottom_right = bottom_right!($a);
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!(get_y(upper_left) > get_y(bottom_right) || get_x(upper_left) > get_x(bottom_right))
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}};
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}
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