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use std::ops::Range;
use super::{DescreteRanged, Ranged};
macro_rules! impl_descrete_trait {
($name:ident) => {
impl DescreteRanged for $name {
fn next_value(this: &Self::ValueType) -> Self::ValueType {
return *this + 1;
}
}
};
}
macro_rules! make_numeric_coord {
($type:ty, $name:ident, $key_points:ident) => {
pub struct $name($type, $type);
impl From<Range<$type>> for $name {
fn from(range: Range<$type>) -> Self {
return Self(range.start, range.end);
}
}
impl Ranged for $name {
type ValueType = $type;
fn map(&self, v: &$type, limit: (i32, i32)) -> i32 {
let logic_length = (*v - self.0) as f64 / (self.1 - self.0) as f64;
let actual_length = limit.1 - limit.0;
if actual_length == 0 {
return limit.1;
}
return limit.0 + (actual_length as f64 * logic_length) as i32;
}
fn key_points(&self, max_points: usize) -> Vec<$type> {
$key_points((self.0, self.1), max_points)
}
fn range(&self) -> Range<$type> {
return self.0..self.1;
}
}
};
}
macro_rules! gen_key_points_comp {
(float, $name:ident, $type:ty) => {
fn $name(range: ($type, $type), max_points: usize) -> Vec<$type> {
let mut scale = (10 as $type).powf((range.1 - range.0).log(10.0).floor());
fn rem_euclid(a: $type, b: $type) -> $type {
if b > 0.0 {
a - (a / b).floor() * b
} else {
a - (a / b).ceil() * b
}
}
let mut left = range.0 + rem_euclid(range.0, -scale);
let mut right = range.1 - rem_euclid(range.1, scale);
'outer: loop {
let old_scale = scale;
for nxt in [2.0, 5.0, 10.0].iter() {
let new_left = range.0 + rem_euclid(range.0, -scale / nxt);
let new_right = range.1 - rem_euclid(range.1, scale / nxt);
let npoints = 1 + ((new_right - new_left) / old_scale * nxt) as usize;
if npoints > max_points {
break 'outer;
}
scale = old_scale / nxt;
left = new_left;
right = new_right;
}
}
let mut ret = vec![];
while left <= right {
ret.push(left as $type);
left += scale;
}
return ret;
}
};
(integer, $name:ident, $type:ty) => {
fn $name(range: ($type, $type), max_points: usize) -> Vec<$type> {
let mut scale: $type = 1;
'outter: while (range.1 - range.0 + scale - 1) as usize / (scale as usize) > max_points
{
let next_scale = scale * 10;
for new_scale in [scale * 2, scale * 5, scale * 10].iter() {
scale = *new_scale;
if (range.1 - range.0 + *new_scale - 1) as usize / (*new_scale as usize)
< max_points
{
break 'outter;
}
}
scale = next_scale;
}
let (mut left, right) = (
range.0 + (scale - range.0 % scale) % scale,
range.1 - range.1 % scale,
);
let mut ret = vec![];
while left <= right {
ret.push(left as $type);
left += scale;
}
return ret;
}
};
}
gen_key_points_comp!(float, compute_f32_key_points, f32);
gen_key_points_comp!(float, compute_f64_key_points, f64);
gen_key_points_comp!(integer, compute_i32_key_points, i32);
gen_key_points_comp!(integer, compute_u32_key_points, u32);
gen_key_points_comp!(integer, compute_i64_key_points, i64);
gen_key_points_comp!(integer, compute_u64_key_points, u64);
make_numeric_coord!(f32, RangedCoordf32, compute_f32_key_points);
make_numeric_coord!(f64, RangedCoordf64, compute_f64_key_points);
make_numeric_coord!(u32, RangedCoordu32, compute_u32_key_points);
make_numeric_coord!(i32, RangedCoordi32, compute_i32_key_points);
make_numeric_coord!(u64, RangedCoordu64, compute_u64_key_points);
make_numeric_coord!(i64, RangedCoordi64, compute_i64_key_points);
impl_descrete_trait!(RangedCoordu32);
impl_descrete_trait!(RangedCoordi32);
impl_descrete_trait!(RangedCoordu64);
impl_descrete_trait!(RangedCoordi64);
#[cfg(test)]
mod test {
use super::*;
use crate::coord::*;
#[test]
fn test_key_points() {
let kp = compute_i32_key_points((0, 999), 28);
assert!(kp.len() > 0);
assert!(kp.len() <= 28);
}
#[test]
fn test_linear_coord_map() {
let coord: RangedCoordu32 = (0..20).into();
assert_eq!(coord.key_points(11).len(), 11);
assert_eq!(coord.key_points(11)[0], 0);
assert_eq!(coord.key_points(11)[10], 20);
assert_eq!(coord.map(&5, (0, 100)), 25);
let coord: RangedCoordf32 = (0f32..20f32).into();
assert_eq!(coord.map(&5.0, (0, 100)), 25);
}
#[test]
fn test_linear_coord_system() {
let _coord =
RangedCoord::<RangedCoordu32, RangedCoordu32>::new(0..10, 0..10, (0..1024, 0..768));
}
}