Practical Rust Projects by Shing Lyu

Author:Shing Lyu
Language: eng
Format: epub
ISBN: 9781484255995
Publisher: Apress

// ...

impl<'s> System<'s> for BounceSystem {

// ...

fn run(

&mut self,

(mut balls, players, transforms): Self::SystemData

) {

for (ball, transform) in (&mut balls, &transforms).join() {

// ...

// Bounce at the players.

for (player, player_transform) in

(&players, &transforms).join() {

let player_x = player_transform

.translation().x - (player.width * 0.5);

let player_y = player_transform

.translation().y - (player.height * 0.5);

if point_in_rect(

ball_x,

ball_y,

player_x - ball.radius,

player_y - ball.radius,

player_x + player.width + ball.radius,

player_y + player.height + ball.radius,

) {

if ball.velocity[1] < 0.0 {

// Only bounce when ball is falling

ball.velocity[1] = -ball.velocity[1];

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