roguelike-game/src/camera.rs

169 lines
5.0 KiB
Rust

use rltk::{Point, Rltk, RGB};
use specs::prelude::*;
use crate::{Hidden, Map, Position, Renderable, TileType};
const SHOW_BOUNDARIES: bool = true;
pub fn get_screen_bounds(ecs: &World, ctx: &mut Rltk) -> (i32, i32, i32, i32) {
let player_pos = ecs.fetch::<Point>();
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;
(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] {
let (glyph, fg, bg) = get_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,
);
}
}
}
}
fn get_tile_glyph(idx: usize, map: &Map) -> (rltk::FontCharType, RGB, RGB) {
let glyph;
let mut fg;
let mut bg = RGB::from_f32(0., 0., 0.);
match map.tiles[idx] {
TileType::Floor => {
glyph = rltk::to_cp437('.');
fg = RGB::from_f32(0., 0.5, 0.5);
}
TileType::Wall => {
let x = idx as i32 % map.width;
let y = idx as i32 / map.width;
glyph = wall_glyph(&*map, x, y);
fg = RGB::from_f32(0., 1.0, 0.);
}
TileType::DownStairs => {
glyph = rltk::to_cp437('>');
fg = RGB::from_f32(0., 1.0, 1.0);
}
};
if map.bloodstains.contains(&idx) {
bg = RGB::from_f32(0.75, 0., 0.);
}
if !map.visible_tiles[idx] {
fg = fg.to_greyscale();
// Don't show bloodstains out of visual range
bg = RGB::from_f32(0., 0., 0.);
}
(glyph, fg, bg)
}
fn wall_glyph(map: &Map, x: i32, y: i32) -> rltk::FontCharType {
if x < 1 || x > map.width - 2 || y < 1 || y > map.height - 2 {
return 35;
}
let mut mask = 0u8;
if is_revealed_and_wall(map, x, y - 1) {
mask += 1;
}
if is_revealed_and_wall(map, x, y + 1) {
mask += 2;
}
if is_revealed_and_wall(map, x - 1, y) {
mask += 4;
}
if is_revealed_and_wall(map, x + 1, y) {
mask += 8;
}
match mask {
0 => 9, // Pillar because we can't see neighbors
1 => 186, // Wall only to the north
2 => 186, // Wall only to the south
3 => 186, // Wall to the north and south
4 => 205, // Wall only to the west
5 => 188, // Wall to the north and west
6 => 187, // Wall to the south and west
7 => 185, // Wall to the north, south, and west
8 => 205, // Wall only to the east
9 => 200, // Wall to the north and east
10 => 201, // Wall to the sound and east
11 => 204, // Wall to the north, south, and east
12 => 205, // Wall to the east and west
13 => 202, // Wall to the east, west, and south
14 => 203, // Wall to the east, west, and north
15 => 206, // ╬ Wall on all sides
_ => 35, // We missed one?
}
}
fn is_revealed_and_wall(map: &Map, x: i32, y: i32) -> bool {
let idx = map.xy_idx(x, y);
map.tiles[idx] == TileType::Wall && map.revealed_tiles[idx]
}