roguelike-game/src/camera.rs

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3.9 KiB
Rust
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use ::rltk::{Point, Rltk, RGB};
use ::specs::prelude::*;
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use crate::map::tile_glyph;
use crate::{Hidden, Map, Position, Renderable};
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const SHOW_BOUNDARIES: bool = false;
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pub fn get_screen_bounds(ecs: &World, _ctx: &mut Rltk) -> (i32, i32, i32, i32) {
let player_pos = ecs.fetch::<Point>();
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// let (x_chars, y_chars) = ctx.get_char_size();
let (x_chars, y_chars) = (48, 44);
let center_x = (x_chars / 2) as i32;
let center_y = (y_chars / 2) as i32;
let min_x = player_pos.x - center_x;
let max_x = min_x + x_chars as i32;
let min_y = player_pos.y - center_y;
let max_y = min_y + y_chars as i32;
(min_x, max_x, min_y, max_y)
}
pub fn render_camera(ecs: &World, ctx: &mut Rltk) {
let map = ecs.fetch::<Map>();
let (min_x, max_x, min_y, max_y) = get_screen_bounds(ecs, ctx);
// Render the Map
let map_width = map.width - 1;
let map_height = map.height - 1;
let mut y = 0;
#[allow(clippy::explicit_counter_loop)]
for ty in min_y..max_y {
let mut x = 0;
for tx in min_x..max_x {
if tx > 0 && tx < map_width && ty > 0 && ty < map_height {
let idx = map.xy_idx(tx, ty);
if map.revealed_tiles[idx] {
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let (glyph, fg, bg) = tile_glyph(idx, &*map);
ctx.set(x, y, fg, bg, glyph);
}
} else if SHOW_BOUNDARIES {
ctx.set(
x,
y,
RGB::named(rltk::GRAY),
RGB::named(rltk::BLACK),
rltk::to_cp437('·'),
);
}
x += 1;
}
y += 1;
}
// Render entities
let positions = ecs.read_storage::<Position>();
let renderables = ecs.read_storage::<Renderable>();
let hidden = ecs.read_storage::<Hidden>();
let map = ecs.fetch::<Map>();
let mut data = (&positions, &renderables, !&hidden)
.join()
.collect::<Vec<_>>();
data.sort_by(|&a, &b| b.1.render_order.cmp(&a.1.render_order));
for (pos, render, _hidden) in data.iter() {
let idx = map.xy_idx(pos.x, pos.y);
if map.visible_tiles[idx] {
let entity_screen_x = pos.x - min_x;
let entity_screen_y = pos.y - min_y;
if entity_screen_x > 0
&& entity_screen_x < map_width
&& entity_screen_y > 0
&& entity_screen_y < map_height
{
ctx.set(
entity_screen_x,
entity_screen_y,
render.fg,
render.bg,
render.glyph,
);
}
}
}
}
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pub fn render_debug_map(map: &Map, ctx: &mut Rltk) {
let player_pos = Point::new(map.width / 2, map.height / 2);
let (x_chars, y_chars) = ctx.get_char_size();
let center_x = (x_chars / 2) as i32;
let center_y = (y_chars / 2) as i32;
let min_x = player_pos.x - center_x;
let max_x = min_x + x_chars as i32;
let min_y = player_pos.y - center_y;
let max_y = min_y + y_chars as i32;
let map_width = map.width - 1;
let map_height = map.height - 1;
let mut y = 0;
#[allow(clippy::explicit_counter_loop)]
for ty in min_y..max_y {
let mut x = 0;
for tx in min_x..max_x {
if tx > 0 && tx < map_width && ty > 0 && ty < map_height {
let idx = map.xy_idx(tx, ty);
if map.revealed_tiles[idx] {
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let (glyph, fg, bg) = tile_glyph(idx, &*map);
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ctx.set(x, y, fg, bg, glyph);
}
} else if SHOW_BOUNDARIES {
ctx.set(
x,
y,
RGB::named(rltk::GRAY),
RGB::named(rltk::BLACK),
rltk::to_cp437('·'),
);
}
x += 1;
}
y += 1;
}
}