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use std::collections::HashSet;
use crate::zone::{Direction, Zone};
#[derive(Debug, Clone, Default, PartialEq)]
pub struct Node {
pub ratio: f64,
pub instruction: Instruction,
}
#[derive(Debug, Clone, Default, PartialEq)]
pub enum Instruction {
#[default]
Leaf,
Split {
direction: Direction,
children: Vec<Node>,
},
}
impl Instruction {
pub fn slice(&self, arena: Zone) -> HashSet<Zone> {
let mut result = HashSet::new();
self.slice_inner(arena, &mut result);
result
}
fn slice_inner(&self, arena: Zone, result: &mut HashSet<Zone>) {
match self {
Instruction::Leaf => {
result.insert(arena);
}
Instruction::Split {
direction,
children,
} => {
let divisions: Vec<f64> = children.iter().map(|c| c.ratio).collect();
let child_areas = arena.slice(&divisions, *direction);
for (node, child) in children.iter().zip(child_areas) {
node.instruction.slice_inner(child, result);
}
}
}
}
}
#[cfg(test)]
mod tests {
use std::collections::HashSet;
use crate::{
instruction::Node,
zone::{Direction, Zone},
};
use super::Instruction;
#[test]
fn test_leaf() {
let instruction = Instruction::Leaf;
let expected = HashSet::from([Zone::full()]);
let actual = instruction.slice(Zone::full());
assert_eq!(expected, actual)
}
#[test]
fn test_shallow_split() {
let instruction = Instruction::Split {
direction: Direction::Vertical,
children: vec![
Node {
ratio: 3.0,
instruction: Instruction::Leaf,
},
Node {
ratio: 1.0,
instruction: Instruction::Leaf,
},
],
};
let expected = HashSet::from([
Zone {
x: 0,
y: 0,
width: 100,
height: 75,
},
Zone {
x: 0,
y: 75,
width: 100,
height: 25,
},
]);
let actual = instruction.slice(Zone::full());
assert_eq!(expected, actual)
}
#[test]
fn test_deep_split() {
let instruction = Instruction::Split {
direction: Direction::Horizontal,
children: vec![
Node {
ratio: 1.0,
instruction: Instruction::Leaf,
},
Node {
ratio: 2.0,
instruction: Instruction::Split {
direction: Direction::Vertical,
children: vec![
Node {
ratio: 1.0,
instruction: Instruction::Leaf,
},
Node {
ratio: 1.0,
instruction: Instruction::Leaf,
},
],
},
},
Node {
ratio: 1.0,
instruction: Instruction::Leaf,
},
],
};
let expected = HashSet::from([
Zone {
x: 0,
y: 0,
width: 25,
height: 100,
},
Zone {
x: 25,
y: 50,
width: 50,
height: 50,
},
Zone {
x: 25,
y: 0,
width: 50,
height: 50,
},
Zone {
x: 75,
y: 0,
width: 25,
height: 100,
},
]);
let actual = instruction.slice(Zone::full());
assert_eq!(expected, actual)
}
#[test]
fn test_three_split() {
let instruction = Instruction::Split {
direction: Direction::Horizontal,
children: vec![
Node {
ratio: 1.0,
instruction: Instruction::Leaf,
},
Node {
ratio: 1.0,
instruction: Instruction::Split {
direction: Direction::Vertical,
children: vec![
Node {
ratio: 1.0,
instruction: Instruction::Leaf,
},
Node {
ratio: 1.0,
instruction: Instruction::Leaf,
},
],
},
},
],
};
let expected = HashSet::from([
Zone {
x: 0,
y: 0,
width: 50,
height: 100,
},
Zone {
x: 50,
y: 0,
width: 50,
height: 50,
},
Zone {
x: 50,
y: 50,
width: 50,
height: 50,
},
]);
let actual = instruction.slice(Zone::full());
assert_eq!(expected, actual)
}
}