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/*
* meli
*
* Copyright 2017-2018 Manos Pitsidianakis
*
* This file is part of meli.
*
* meli is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* meli is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with meli. If not, see <http://www.gnu.org/licenses/>.
*/
/*!
Simple type definitions and macro helper for a (x,y) position on the terminal and the areas they define.
An `Area` consists of two points: the upper left and bottom right corners.
*/
/// A `(x, y)` position on screen.
pub type Pos = (usize, usize);
#[inline(always)]
pub fn get_x(p: Pos) -> usize {
p.0
}
#[inline(always)]
pub fn get_y(p: Pos) -> usize {
p.1
}
#[inline(always)]
pub fn set_x(p: Pos, new_x: usize) -> Pos {
(new_x, p.1)
}
#[inline(always)]
pub fn set_y(p: Pos, new_y: usize) -> Pos {
(p.0, new_y)
}
#[inline(always)]
pub fn pos_inc(p: Pos, inc: (usize, usize)) -> Pos {
(p.0 + inc.0, p.1 + inc.1)
}
#[inline(always)]
pub fn pos_dec(p: Pos, dec: (usize, usize)) -> Pos {
(p.0.saturating_sub(dec.0), p.1.saturating_sub(dec.1))
}
/// An `Area` consists of two points: the upper left and bottom right corners.
///
/// Example:
/// ```no_run
/// let new_area = ((0, 0), (1, 1));
/// ```
pub type Area = (Pos, Pos);
/// Get an area's height
///
/// Example:
/// ```
/// let new_area = ((0, 0), (1, 1));
/// assert_eq!(height!(new_area), 1);
/// ```
#[macro_export]
macro_rules! height {
($a:expr) => {
(get_y(bottom_right!($a))).saturating_sub(get_y(upper_left!($a)))
};
}
/// Get an area's width
///
/// Example:
/// ```
/// let new_area = ((0, 0), (1, 1));
/// assert_eq!(width!(new_area), 1);
/// ```
#[macro_export]
macro_rules! width {
($a:expr) => {
(get_x(bottom_right!($a))).saturating_sub(get_x(upper_left!($a)))
};
}
/// Get the upper left Position of an area
///
/// Example:
/// ```
/// let new_area = ((0, 0), (1, 1));
/// assert_eq!(upper_left!(new_area), (0, 0));
/// ```
#[macro_export]
macro_rules! upper_left {
($a:expr) => {
$a.0
};
}
/// Get the bottom right Position of an area
///
/// Example:
/// ```
/// let new_area = ((0, 0), (1, 1));
/// assert_eq!(bottom_right!(new_area), (1, 1));
/// ```
#[macro_export]
macro_rules! bottom_right {
($a:expr) => {
$a.1
};
}
/// Check if area is valid.
///
/// Example:
/// ```
/// let valid_area = ((0, 0), (1, 1));
/// assert!(is_valid_area!(valid_area));
///
/// let invalid_area = ((2, 2), (1, 1));
/// assert!(!is_valid_area!(invalid_area));
/// ```
///
#[macro_export]
macro_rules! is_valid_area {
($a:expr) => {{
let upper_left = upper_left!($a);
let bottom_right = bottom_right!($a);
!(get_y(upper_left) > get_y(bottom_right) || get_x(upper_left) > get_x(bottom_right))
}};
}
/// Place box given by `(width, height)` in center of `area`
pub fn center_area(area: Area, (width, height): (usize, usize)) -> Area {
let mid_x = { std::cmp::max(width!(area) / 2, width / 2) - width / 2 };
let mid_y = { std::cmp::max(height!(area) / 2, height / 2) - height / 2 };
let (upper_x, upper_y) = upper_left!(area);
let (max_x, max_y) = bottom_right!(area);
(
(
std::cmp::min(max_x, upper_x + mid_x),
std::cmp::min(max_y, upper_y + mid_y),
),
(
std::cmp::min(max_x, upper_x + mid_x + width),
std::cmp::min(max_y, upper_y + mid_y + height),
),
)
}
/// Place box given by `(width, height)` in corner of `area`
pub fn place_in_area(area: Area, (width, height): (usize, usize), upper: bool, left: bool) -> Area {
let (upper_x, upper_y) = upper_left!(area);
let (max_x, max_y) = bottom_right!(area);
let x = if upper {
upper_x + 2
} else {
max_x.saturating_sub(2).saturating_sub(width)
};
let y = if left {
upper_y + 2
} else {
max_y.saturating_sub(2).saturating_sub(height)
};
(
(std::cmp::min(x, max_x), std::cmp::min(y, max_y)),
(
std::cmp::min(x + width, max_x),
std::cmp::min(y + height, max_y),
),
)
}