From d7df3ebaee3593a7dc0dd9141c711d7a4cec6938 Mon Sep 17 00:00:00 2001
From: Louis Capitanchik <contact@louiscap.co>
Date: Sun, 2 Jul 2023 11:46:11 +0100
Subject: [PATCH] Render moving background
---
src/entities/spawning.rs | 25 ++++++++++++++++++++-----
src/system/mod.rs | 5 ++++-
src/system/parallax.rs | 19 +++++++++++++++++++
3 files changed, 43 insertions(+), 6 deletions(-)
create mode 100644 src/system/parallax.rs
diff --git a/src/entities/spawning.rs b/src/entities/spawning.rs
index 27d3422..0c8c7a5 100644
--- a/src/entities/spawning.rs
+++ b/src/entities/spawning.rs
@@ -1,19 +1,20 @@
use crate::entities::motion::Velocity;
use crate::entities::Player;
+use crate::system::Background;
use bevy::ecs::system::SystemParam;
use bevy::prelude::{AssetServer, Commands, Entity, Res, SpriteBundle, Transform, Vec2};
+static Z_PLAYER: f32 = 300.0;
+static Z_ITEMS: f32 = 200.0;
+static Z_ENEMY: f32 = 250.0;
+static Z_BACKGROUND: f32 = 50.0;
+
#[derive(SystemParam)]
pub struct EntitySpawner<'w, 's> {
commands: Commands<'w, 's>,
assets: Res<'w, AssetServer>,
}
-static Z_PLAYER: f32 = 300.0;
-static Z_ITEMS: f32 = 200.0;
-static Z_ENEMY: f32 = 250.0;
-static Z_BACKGROUND: f32 = 50.0;
-
impl<'w, 's> EntitySpawner<'w, 's> {
pub fn spawn_player_at(&mut self, position: Vec2) -> Entity {
self.commands
@@ -28,4 +29,18 @@ impl<'w, 's> EntitySpawner<'w, 's> {
))
.id()
}
+
+ pub fn spawn_background_at(&mut self, position: Vec2) -> Entity {
+ self.commands
+ .spawn((
+ SpriteBundle {
+ texture: self.assets.load("sprites/background.png"),
+ transform: Transform::from_translation(position.extend(Z_BACKGROUND)),
+ ..Default::default()
+ },
+ Velocity::from(Vec2::new(-75.0, 0.0)),
+ Background,
+ ))
+ .id()
+ }
}
diff --git a/src/system/mod.rs b/src/system/mod.rs
index 1a93ae6..b405660 100644
--- a/src/system/mod.rs
+++ b/src/system/mod.rs
@@ -1,4 +1,5 @@
mod camera;
+mod parallax;
mod window;
mod _plugin {
@@ -8,12 +9,14 @@ mod _plugin {
pub struct SystemPlugin;
impl Plugin for SystemPlugin {
fn build(&self, app: &mut App) {
- app.add_startup_system(super::camera::spawn_2d_camera);
+ app.add_startup_system(super::camera::spawn_2d_camera)
+ .add_startup_system(super::parallax::spawn_backgrounds);
}
}
}
pub use camera::default_projection;
+pub use parallax::Background;
pub use window::{window_bounds, VIEWPORT_HEIGHT, VIEWPORT_WIDTH};
pub use _plugin::SystemPlugin;
diff --git a/src/system/parallax.rs b/src/system/parallax.rs
new file mode 100644
index 0000000..b064555
--- /dev/null
+++ b/src/system/parallax.rs
@@ -0,0 +1,19 @@
+use crate::entities::EntitySpawner;
+use crate::system::window_bounds;
+use bevy::prelude::{Component, Vec2};
+
+#[derive(Component)]
+pub struct Background;
+
+// TODO: No Magic Numbers!
+const BACKGROUND_WIDTH: f32 = 2110.0;
+
+pub fn spawn_backgrounds(mut spawner: EntitySpawner) {
+ let bounds = window_bounds();
+ spawner.spawn_background_at(Vec2::new(BACKGROUND_WIDTH / 2.0, bounds.height() / 2.0));
+
+ spawner.spawn_background_at(Vec2::new(
+ (BACKGROUND_WIDTH / 2.0) + BACKGROUND_WIDTH,
+ bounds.height() / 2.0,
+ ));
+}
--
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