roguelike-game/src/map/camera.rs

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5.9 KiB
Rust
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//! Handle rendering of the viewport
use ::bracket_lib::prelude::*;
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use ::specs::prelude::*;
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use crate::components::{Hidden, Position, Renderable, Target, TileSize};
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use crate::map::tile_glyph;
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use crate::{colors, Map};
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/// Whether to render an outline of the current map's boundaries
#[cfg(feature = "debug")]
const SHOW_BOUNDARIES: bool = true;
/// Whether to render an outline of the current map's boundaries
#[cfg(not(feature = "debug"))]
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const SHOW_BOUNDARIES: bool = false;
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/// Get the rectangle representing the current viewport
pub fn get_screen_bounds(ecs: &World, _ctx: &mut BTerm) -> (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)
}
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/// Render the current viewport
pub fn render_camera(ecs: &World, ctx: &mut BTerm) {
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let mut draw_batch = DrawBatch::new();
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;
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for (y, ty) in (min_y..max_y).enumerate() {
for (x, tx) in (min_x..max_x).enumerate() {
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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draw_batch.set(Point::new(x, y), ColorPair::new(fg, bg), glyph);
}
} else if SHOW_BOUNDARIES {
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draw_batch.set(
Point::new(x, y),
ColorPair::new(colors::GRAY, colors::BLACK),
to_cp437('·'),
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);
}
}
}
// 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>();
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let sizes = ecs.read_storage::<TileSize>();
let entities = ecs.entities();
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let targets = ecs.read_storage::<Target>();
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let mut data = (&positions, &renderables, &entities, !&hidden)
.join()
.collect::<Vec<_>>();
data.sort_by(|&a, &b| b.1.render_order.cmp(&a.1.render_order));
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for (pos, render, entity, _hidden) in data.iter() {
if let Some(size) = sizes.get(*entity) {
for cy in 0..size.y {
for cx in 0..size.x {
let tile_x = cx + pos.x;
let tile_y = cy + pos.y;
let idx = map.xy_idx(tile_x, tile_y);
if map.visible_tiles[idx] {
let entity_screen_x = (cx + pos.x) - min_x;
let entity_screen_y = (cy + pos.y) - min_y;
if entity_screen_x > 0
&& entity_screen_x < map_width
&& entity_screen_y > 0
&& entity_screen_y < map_height
{
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draw_batch.set(
Point::new(entity_screen_x + 1, entity_screen_y + 1),
ColorPair::new(render.fg, render.bg),
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render.glyph,
);
}
}
}
}
} else {
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
{
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draw_batch.set(
Point::new(entity_screen_x, entity_screen_y),
ColorPair::new(render.fg, render.bg),
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render.glyph,
);
}
}
}
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if targets.get(*entity).is_some() {
let entity_screen_x = pos.x - min_x;
let entity_screen_y = pos.y - min_y;
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draw_batch.set(
Point::new(entity_screen_x - 1, entity_screen_y),
ColorPair::new(colors::RED, colors::YELLOW),
to_cp437('['),
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);
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draw_batch.set(
Point::new(entity_screen_x + 1, entity_screen_y),
ColorPair::new(colors::RED, colors::YELLOW),
to_cp437(']'),
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);
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}
}
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draw_batch
.submit(0)
.expect("Failed to batch draw the camera");
}
pub fn render_debug_map(map: &Map, ctx: &mut BTerm) {
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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;
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for (y, ty) in (min_y..max_y).enumerate() {
for (x, tx) in (min_x..max_x).enumerate() {
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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, colors::GRAY, colors::BLACK, to_cp437('·'));
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}
}
}
}