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// most of this module was written out of frustration
// TODO: make all this less messy
use sdl2::{pixels::Color, rect::Point, render::Canvas, video::Window};
use crate::{consts::colors::*, rect};
#[derive(Debug, Copy, Clone)]
pub enum GridKind {
Rectangle,
Isometric,
}
pub struct Grid {
pub enabled: bool,
pub color: Color,
pub kind: GridKind,
}
impl Grid {
pub fn new() -> Self {
Self {
enabled: true,
color: GRID_COLOR,
kind: GridKind::Rectangle,
}
}
pub fn draw(
&self,
canvas: &mut Canvas<Window>,
zoom: u8,
start: &Point,
width: u32,
height: u32,
) {
let cs = zoom as u32;
let (x, y) = (start.x(), start.y());
canvas.set_draw_color(self.color);
match self.kind {
GridKind::Rectangle => {
let mut vertical_tuples = (1..width)
.map(|i| {
let x = (i * cs) as i32;
let y = (height * cs) as i32;
if i % 2 == 0 {
(*start + Point::new(x, 0), *start + Point::new(x, y))
} else {
(*start + Point::new(x, y), *start + Point::new(x, 0))
}
})
.collect::<Vec<_>>();
// SAFETY
// The mem space occupied by a [(T, T); N] is the same as twice the mem space of a
// [T; 2 * N], where T is not a dynamically sized type.
let verticals: Vec<Point> = unsafe {
vertical_tuples.set_len(vertical_tuples.len() * 2);
std::mem::transmute(vertical_tuples)
};
let mut horizontal_tuples = (1..height)
.map(|j| {
let x = (width * cs) as i32;
let y = (j * cs) as i32;
if j % 2 == 0 {
(*start + Point::new(0, y), *start + Point::new(x, y))
} else {
(*start + Point::new(x, y), *start + Point::new(0, y))
}
})
.collect::<Vec<_>>();
let horizontals: Vec<Point> = unsafe {
horizontal_tuples.set_len(horizontal_tuples.len() * 2);
std::mem::transmute(horizontal_tuples)
};
canvas.draw_lines(&verticals[..]).unwrap();
canvas.draw_lines(&horizontals[..]).unwrap();
}
GridKind::Isometric => {
canvas.set_clip_rect(Some(rect!(x, y, width * cs, height * cs)));
for i in (0..2 * height + width).step_by(2) {
let begin = ((i * cs) as i32, 0i32);
let end = (0i32, (i * cs) as i32 / 2);
canvas
.draw_line(*start + begin.into(), *start + end.into())
.unwrap();
let begin_m = ((i as i32 - 2 * height as i32) * cs as i32, 0i32);
let end_m = (
(width * cs) as i32,
((width + 2 * height - i) * cs) as i32 / 2,
);
canvas
.draw_line(*start + begin_m.into(), *start + end_m.into())
.unwrap();
}
canvas.set_clip_rect(None);
}
}
}
}
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