135 lines
3.9 KiB
Rust
135 lines
3.9 KiB
Rust
use ai_behavior::Action;
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use find_folder;
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use gfx_device_gl::Resources;
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use piston_window::*;
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use ncollide::shape::Cuboid2;
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use nalgebra::Vector2;
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use sprite::*;
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use uuid::Uuid;
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use rand;
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use std::rc::Rc;
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use super::wrap;
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pub struct Star {
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pub sprite_id: Uuid,
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pub x: f64,
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pub y: f64,
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w: f64,
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h: f64,
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dir: u32,
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pub collider: Cuboid2<f64>,
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pub destroyed: bool,
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accel: f64,
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}
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const DESIGNED_FOR_WIDTH: f64 = 640.0;
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const SCALE_FACTOR: f64 = 0.5;
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const MOVE_DUR: f64 = 0.75;
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const DESTROY_DUR: f64 = 0.75;
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impl Star {
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pub fn new(color: &str, w: &mut PistonWindow, scene: &mut Scene<Texture<Resources>>) -> Star {
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let assets = find_folder::Search::ParentsThenKids(3, 3)
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.for_folder("assets")
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.unwrap();
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let tex = Rc::new(Texture::from_path(&mut w.factory,
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assets.join(format!("{}_star.png", color)),
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Flip::None,
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&TextureSettings::new())
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.unwrap());
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let Size { width, height } = w.size();
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let x = rand_pos(width as f64);
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let y = rand_pos(height as f64);
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let scale = width as f64 / DESIGNED_FOR_WIDTH * SCALE_FACTOR;
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let accel = match color {
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"yellow" => 3.0,
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"blue" => 1.0,
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"green" => 2.0,
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_ => 2.0,
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};
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let mut sprite = Sprite::from_texture(tex);
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sprite.set_scale(scale, scale);
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sprite.set_position(x, y);
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let bounds = sprite.bounding_box();
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let sprite_id = scene.add_child(sprite);
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Star {
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x: x,
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y: y,
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w: bounds[2],
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h: bounds[3],
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sprite_id: sprite_id,
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dir: rand_dir(),
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collider: Cuboid2::new(Vector2::new(bounds[2], bounds[3])),
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destroyed: false,
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accel: accel,
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}
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}
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pub fn mov(&mut self, w: &PistonWindow, scene: &mut Scene<Texture<Resources>>, dt: f64) {
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if self.destroyed {
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return;
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}
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if let Some(sprite) = scene.child(self.sprite_id) {
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let (sprite_x, sprite_y) = sprite.get_position();
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self.x = sprite_x;
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self.y = sprite_y;
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}
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let (wrapped, new_x, new_y) = wrap((w.size().width.into(), w.size().height.into()),
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(self.w, self.h),
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(self.x, self.y));
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if wrapped {
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if let Some(ref mut sprite) = scene.child_mut(self.sprite_id) {
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self.x = new_x;
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self.y = new_y;
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sprite.set_position(self.x, self.y);
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}
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}
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self.dir = rand_turn(self.dir);
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let dir = lookup_dir(self.dir);
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let mov_x = self.accel * dir.0;
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let mov_y = self.accel * dir.1;
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scene.run(self.sprite_id,
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&Action(Ease(EaseFunction::CubicOut,
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Box::new(MoveBy(dt * MOVE_DUR, mov_x, mov_y)))));
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}
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pub fn destroy(&mut self, scene: &mut Scene<Texture<Resources>>, dt: f64) {
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scene.run(self.sprite_id,
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&Action(Ease(EaseFunction::CubicOut, Box::new(FadeOut(dt * DESTROY_DUR)))));
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self.destroyed = true;
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}
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}
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fn rand_dir() -> u32 {
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rand::random::<u32>() % 8
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}
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fn rand_pos(dim: f64) -> f64 {
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(rand::random::<f64>() % dim).abs()
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}
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fn rand_turn(dir: u32) -> u32 {
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let coin = rand::random::<i32>() % 10;
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match coin {
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-9 => if dir == 0 { 7 } else { dir - 1 },
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9 => if dir == 7 { 0 } else { dir + 1 },
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_ => dir,
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}
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}
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fn lookup_dir(dir: u32) -> (f64, f64) {
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match dir {
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0 => (0.0, -1.0),
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1 => (1.0, -1.0),
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2 => (1.0, 0.0),
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3 => (1.0, 1.0),
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4 => (0.0, 1.0),
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5 => (-1.0, 1.0),
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6 => (-1.0, 0.0),
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7 => (-1.0, -1.0),
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_ => (0.0, 0.0),
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}
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}
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