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//! An example system that just alternates the colours of our triangle
use stockton_skeleton::types::Vector3;
/// RGB Channels
#[derive(Debug, Clone, Copy)]
enum ColorChannel {
Red,
Green,
Blue,
}
/// A component for our entity.
#[derive(Debug, Clone, Copy)]
pub struct ExampleState {
channel: ColorChannel,
falling: bool,
col_val: Vector3,
}
impl ExampleState {
pub fn color(&self) -> Vector3 {
self.col_val
}
}
impl Default for ExampleState {
fn default() -> Self {
Self {
channel: ColorChannel::Red,
falling: true,
col_val: Vector3::new(1.0, 1.0, 1.0),
}
}
}
/// The speed at which we change colour
const TRANSITION_SPEED: f32 = 0.1;
/// Keep changing the colour of any ExampleStates in our world.
#[system(for_each)]
pub fn mutate_state(state: &mut ExampleState) {
// Which value we're changing
let val = match state.channel {
ColorChannel::Red => &mut state.col_val.x,
ColorChannel::Green => &mut state.col_val.y,
ColorChannel::Blue => &mut state.col_val.z,
};
if state.falling {
*val -= TRANSITION_SPEED;
// Fall, then rise
if *val <= 0.0 {
*val = 0.0;
state.falling = false;
}
} else {
*val += TRANSITION_SPEED;
if *val >= 1.0 {
*val = 1.0;
// Rather than going back to falling, go to the next channel
state.falling = true;
state.channel = match state.channel {
ColorChannel::Red => ColorChannel::Green,
ColorChannel::Green => ColorChannel::Blue,
ColorChannel::Blue => ColorChannel::Red,
}
}
}
}
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