forked from tutorials/rust-sokoban
123 lines
4.5 KiB
Rust
123 lines
4.5 KiB
Rust
use ggez::graphics::Image;
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use ggez::graphics::{Color, DrawParam};
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use ggez::{nalgebra as na, timer};
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use ggez::{graphics, Context};
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use ggez::graphics::spritebatch::SpriteBatch;
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use itertools::Itertools;
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use specs::{Join, Read, ReadStorage, System};
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use std::collections::HashMap;
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use std::time::Duration;
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use crate::components::*;
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use crate::constants::TILE_WIDTH;
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use crate::resources::*;
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pub struct RenderingSystem<'a> {
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pub context: &'a mut Context,
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}
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impl RenderingSystem<'_> {
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pub fn draw_text(&mut self, text_string: &str, x: f32, y: f32) {
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let text = graphics::Text::new(text_string);
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let destination = na::Point2::new(x, y);
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let color = Some(Color::new(0.0, 0.0, 0.0, 1.0));
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let dimensions = na::Point2::new(0.0, 20.0);
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graphics::queue_text(self.context, &text, dimensions, color);
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graphics::draw_queued_text(
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self.context,
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graphics::DrawParam::new().dest(destination),
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None,
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graphics::FilterMode::Linear,
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)
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.expect("expected drawing queued text");
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}
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pub fn get_image(&mut self, renderable: &Renderable, delta: Duration) -> String {
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let path_index = match renderable.kind() {
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RenderableKind::Static => {
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// We only have one image, so we just return that
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0
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}
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RenderableKind::Animated => {
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// If we have multiple, we want to select the right one based on the delta time.
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// First we get the delta in milliseconds, we % by 1000 to get the seconds only
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// and finally we divide by 250 to get a number between 0 and 4. If it's 4
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// we technically are on the next iteration of the loop (or on 0), but we will let
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// the renderable handle this logic of wrapping frames.
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((delta.as_millis() % 1000) / 250) as usize
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}
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};
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renderable.path(path_index)
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}
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}
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impl<'a> System<'a> for RenderingSystem<'a> {
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type SystemData = (
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Read<'a, Gameplay>,
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Read<'a, Time>,
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ReadStorage<'a, Position>,
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ReadStorage<'a, Renderable>,
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);
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fn run(&mut self, data: Self::SystemData) {
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let (gameplay, time, positions, renderables) = data;
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// Clear the screen/set the background
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graphics::clear(self.context, graphics::Color::new(0.95, 0.95, 0.95, 1.0));
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// Get all the renderables with their positions
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let rendering_data = (&positions, &renderables).join().collect::<Vec<_>>();
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let mut rendering_batches: HashMap<u8, HashMap<String, Vec<DrawParam>>> = HashMap::new();
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// Iterate through all paris of positions & renderables, load the image
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// and draw it at the specified position.
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for (position, renderable) in rendering_data.iter() {
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// Load the image
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let image_path = self.get_image(renderable, time.delta);
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let x = position.x as f32 * TILE_WIDTH;
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let y = position.y as f32 * TILE_WIDTH;
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let z = position.z;
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// Add to rendering batches
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let draw_param = DrawParam::new().dest(na::Point2::new(x, y));
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rendering_batches
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.entry(z)
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.or_default()
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.entry(image_path)
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.or_default()
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.push(draw_param);
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}
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// Iterate spritebatches ordered by z and actually render each of them
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for (_z, group) in rendering_batches
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.iter()
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.sorted_by(|a, b| Ord::cmp(&a.0, &b.0)) {
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for (image_path, draw_params) in group {
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let image = Image::new(self.context, image_path).expect("expected image");
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let mut sprite_batch = SpriteBatch::new(image);
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for draw_param in draw_params.iter() {
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sprite_batch.add(*draw_param);
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}
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graphics::draw(self.context, &sprite_batch, graphics::DrawParam::new())
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.expect("expected render");
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}
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}
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// Render any text
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self.draw_text(&gameplay.state.to_string(), 525.0, 80.0);
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self.draw_text(&gameplay.moves_count.to_string(), 525.0, 100.0);
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let fps = format!("FPS: {:.0}", timer::fps(self.context));
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self.draw_text(&fps, 525.0, 120.0);
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// Finally, present the context, this will actually display everything
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// on the screen.
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graphics::present(self.context).expect("expected to present");
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}
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}
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