Make it possible to eat star candy

Cargo.toml

@@ -12,3 +12,5 @@ piston2d-graphics = "0.21.1"
 find_folder = "0.3.0"
 uuid = "0.1.17"
 rand = "0.3"
+nalgebra = "0.12.0"
+ncollide = "0.12.0"

src/lib.rs

@@ -2,6 +2,8 @@ extern crate ai_behavior;
 extern crate find_folder;
 extern crate gfx_device_gl;
 extern crate graphics;
+extern crate nalgebra;
+extern crate ncollide;
 extern crate piston_window;
 extern crate rand;
 extern crate sprite;
@@ -20,6 +22,7 @@ pub struct Game {
     scene: Scene<Texture<Resources>>,
     player: Hero,
     star: Star,
+    diag: bool,
 }
 
 impl Game {
@@ -31,12 +34,18 @@ impl Game {
             scene: scene,
             player: player,
             star: star,
+            diag: false,
         }
     }
 
     pub fn on_update(&mut self, e: &Input, upd: UpdateArgs, w: &PistonWindow) {
         self.scene.event(e);
 
+        if !self.star.destroyed && self.player.collides(&self.star) {
+            self.star.destroy(&mut self.scene, upd.dt);
+            self.player.grow(&mut self.scene, upd.dt);
+        }
+
         self.star.mov(w, &mut self.scene, upd.dt);
 
         self.player.mov(w, &mut self.scene, upd.dt);
@@ -63,19 +72,14 @@ impl Game {
                 image.draw(&bg, &Default::default(), c.transform.trans(x, y).zoom(0.1), g);
             }
 
+            if self.diag {
                 text::Text::new_color([0.0, 1.0, 0.0, 1.0], 10).draw(
-                &format!("{} x: {}, y: {}", self.player.sprite_id, self.player.x.trunc(), self.player.y.trunc()),
+                    &format!("{} {}", self.player.diag(), self.star.diag()),
                     &mut glyphs,
                     &c.draw_state,
-                c.transform.trans(10.0, 100.0), g
-            );
-
-            text::Text::new_color([0.0, 1.0, 0.0, 1.0], 10).draw(
-                &format!("{} x: {}, y: {}", self.star.sprite_id, self.star.x.trunc(), self.star.y.trunc()),
-                &mut glyphs,
-                &c.draw_state,
-                c.transform.trans(10.0, 110.0), g
+                    c.transform.trans(10.0, 10.0), g
                 );
+            }
 
             self.scene.draw(c.transform, g);
         });
@@ -115,6 +119,9 @@ impl Game {
                     Button::Keyboard(Key::Right) => {
                         self.player.dir = (0.0, self.player.dir.1);
                     }
+                    Button::Keyboard(Key::H) => {
+                        self.diag = !self.diag;
+                    }
                     _ => {}
                 }
             }

src/mobs/hero.rs

@@ -2,10 +2,13 @@ use ai_behavior::Action;
 use find_folder;
 use gfx_device_gl::Resources;
 use piston_window::*;
+use ncollide::shape::Cuboid2;
+use ncollide::query::{proximity, Proximity};
+use nalgebra::{self, Isometry2, Vector2};
 use sprite::*;
 use uuid::Uuid;
 use std::rc::Rc;
-use mobs::wrap;
+use mobs::{wrap, Star};
 
 pub struct Hero {
     pub sprite_id: Uuid,
@@ -14,6 +17,7 @@ pub struct Hero {
     pub y: f64,
     w: f64,
     h: f64,
+    collider: Cuboid2<f64>,
 }
 
 impl Hero {
@@ -37,6 +41,7 @@ impl Hero {
             h: bounds[3],
             dir: (0.0, 0.0),
             sprite_id: sprite_id,
+            collider: Cuboid2::new(Vector2::new(bounds[2], bounds[3])),
         }
     }
 
@@ -58,4 +63,18 @@ impl Hero {
         let mov_y = self.dir.1 * 2.0;
         scene.run(self.sprite_id, &Action(Ease(EaseFunction::CubicOut, Box::new(MoveBy(dt * 0.75, mov_x, mov_y)))));
     }
+
+    pub fn grow(&mut self, scene: &mut Scene<Texture<Resources>>, dt: f64) {
+        scene.run(self.sprite_id, &Action(Ease(EaseFunction::ElasticInOut, Box::new(ScaleBy(dt * 5.0, 0.3, 0.3)))));
+    }
+
+    pub fn collides(&mut self, star: &Star) -> bool {
+        let star_pos = Isometry2::new(Vector2::new(star.x, star.y), nalgebra::zero());
+        let pos = Isometry2::new(Vector2::new(self.x, self.y), nalgebra::zero());
+        proximity(&star_pos, &star.collider, &pos, &self.collider, 0.0) == Proximity::Intersecting
+    }
+
+    pub fn diag(&self) -> String {
+        format!("{}: x {} / y {}", self.sprite_id, self.x.trunc(), self.y.trunc())
+    }
 }

src/mobs/star.rs

@@ -2,13 +2,14 @@ use ai_behavior::Action;
 use find_folder;
 use gfx_device_gl::Resources;
 use piston_window::*;
+use ncollide::shape::Cuboid2;
+use nalgebra::Vector2;
 use sprite::*;
 use uuid::Uuid;
 use rand;
 use std::rc::Rc;
 use super::wrap;
 
-
 pub struct Star {
     pub sprite_id: Uuid,
     pub x: f64,
@@ -16,6 +17,8 @@ pub struct Star {
     w: f64,
     h: f64,
     dir: u32,
+    pub collider: Cuboid2<f64>,
+    pub destroyed: bool,
 }
 
 impl Star {
@@ -40,10 +43,15 @@ impl Star {
             h: bounds[3],
             sprite_id: sprite_id,
             dir: rand_dir(),
+            collider: Cuboid2::new(Vector2::new(bounds[2], bounds[3])),
+            destroyed: false,
         }
     }
 
     pub fn mov(&mut self, w: &PistonWindow, scene: &mut Scene<Texture<Resources>>, dt: f64) {
+        if self.destroyed {
+            return;
+        }
         if let Some(sprite) = scene.child(self.sprite_id) {
             let (sprite_x, sprite_y) = sprite.get_position();
             self.x = sprite_x;
@@ -63,6 +71,16 @@ impl Star {
         let mov_y = 2.0 * dir.1;
         scene.run(self.sprite_id, &Action(Ease(EaseFunction::CubicOut, Box::new(MoveBy(dt * 0.75, mov_x, mov_y)))));
     }
+
+    pub fn destroy(&mut self, scene: &mut Scene<Texture<Resources>>, dt: f64) {
+        scene.run(self.sprite_id, &Action(Ease(EaseFunction::CubicOut, Box::new(FadeOut(dt * 0.75)))));
+        self.destroyed = true;
+    }
+
+
+    pub fn diag(&self) -> String {
+        format!("{}: x {} / y {}", self.sprite_id, self.x.trunc(), self.y.trunc())
+    }
 }
 
 fn rand_dir() -> u32 {