src/core/object/character.rs

   1 use core::controller::Controller;
   2 use core::object::boll::Boll;
   3 use core::level::{Level, Wall, IntersectResult::Intersection};
   4 use core::object::{Object, Objects, ObjectState};
   5 use core::render::Renderer;
   6 use geometry::Point;
   7 use point;
   8 use sdl2::rect::Rect;
   9 use sprites::SpriteManager;
  10 use std::cell::RefCell;
  11 use std::rc::Rc;
  12 use time::Duration;
  13
  14 ////////// STATE ///////////////////////////////////////////////////////////////
  15
  16 trait State {
  17     fn enter(&self) {}
  18     fn exit(&self) {}
  19     fn update(&mut self, body: &mut Body, ctrl: &Controller, objects: &mut Objects, lvl: &Level, dt: Duration) -> Option<Box<dyn State>>;
  20 }
  21
  22 ////////// CHARACTER ///////////////////////////////////////////////////////////
  23
  24 struct Body {
  25     pub pos: Point<f64>,
  26     pub vel: Point<f64>,
  27     pub standing_on: Option<Wall>,
  28 }
  29
  30 struct StateHolder(Box<dyn State>);
  31
  32 impl StateHolder {
  33     pub fn get(&mut self) -> &mut Box<dyn State> {
  34         &mut self.0
  35     }
  36
  37     pub fn set(&mut self, state: Box<dyn State>) {
  38         self.0.exit();
  39         self.0 = state;
  40         self.0.enter();
  41     }
  42 }
  43
  44 pub struct Character {
  45     ctrl: Rc<RefCell<Controller>>,
  46     body: Body,
  47     state: StateHolder, // Plays well with the borrow checker
  48 }
  49
  50 impl Character {
  51     pub fn new(ctrl: Rc<RefCell<Controller>>) -> Self {
  52         Character {
  53             ctrl,
  54             body: Body {
  55                 pos: point!(300.0, 300.0),
  56                 vel: point!(0.0, 0.0),
  57                 standing_on: None,
  58             },
  59             state: StateHolder(Box::new(FallState)),
  60         }
  61     }
  62 }
  63
  64 impl Object for Character {
  65     fn update(&mut self, objects: &mut Objects, lvl: &Level, dt: Duration) -> ObjectState {
  66         let ctrl = self.ctrl.borrow();
  67
  68         if let Some(state) = self.state.get().update(&mut self.body, &ctrl, objects, lvl, dt) {
  69             self.state.set(state);
  70         }
  71
  72         match &self.body.standing_on {
  73             Some(_wall) => {
  74             },
  75             None => { // in air
  76                 if let Intersection(wall, pos) = lvl.intersect_walls(self.body.pos - self.body.vel, self.body.pos) {
  77                     self.body.standing_on = Some(wall);
  78                     self.body.pos = pos;
  79                     self.body.vel = point!(0.0, 0.0);
  80                     self.state.set(Box::new(StandState));
  81                 }
  82             }
  83         }
  84
  85         if ctrl.shoot.is_pressed {
  86             use rand::distributions::{Distribution, Normal};
  87             let normal = Normal::new(0.0, 0.1);
  88             let direction = if ctrl.aim.to_point().length() > 0.1 { ctrl.aim.to_point() } else { ctrl.mov.to_point() };
  89             for _i in 0..100 {
  90                 objects.push(Box::new(Boll::new(
  91                     self.body.pos + point!(0.0, -16.0), // half the height of mario
  92                     direction * (10.0 + rand::random::<f64>()) + point!(normal.sample(&mut rand::thread_rng()), normal.sample(&mut rand::thread_rng())) + self.body.vel,
  93                     2,
  94                 )));
  95             }
  96             ctrl.rumble(1.0, dt);
  97             self.body.vel -= direction * 0.1;
  98         }
  99
 100         ObjectState::Alive
 101     }
 102
 103     fn render(&self, renderer: &mut Renderer, sprites: &SpriteManager) {
 104         let block = sprites.get("mario");
 105         let size = 32;
 106         renderer.blit(block, None, Rect::new(self.body.pos.x as i32 - size as i32 / 2, self.body.pos.y as i32 - size as i32, size, size));
 107
 108         let ctrl = &self.ctrl.borrow();
 109         let l = 300.0;
 110         let pos = (self.body.pos.x as i32, self.body.pos.y as i32);
 111         // // axis values
 112         // let p = (self.body.pos + ctrl.aim.to_axis_point() * l).to_i32().into();
 113         // renderer.draw_line(pos, p, (0, 255, 0));
 114         // draw_cross(renderer, p);
 115         // values limited to unit vector
 116         let p = (self.body.pos + ctrl.aim.to_point() * l).to_i32().into();
 117         renderer.draw_line(pos, p, (255, 0, 0));
 118         draw_cross(renderer, p);
 119         let p = (self.body.pos + ctrl.mov.to_point() * l).to_i32().into();
 120         renderer.draw_line(pos, p, (0, 255, 0));
 121         draw_cross(renderer, p);
 122         // // circle values
 123         // let p = (self.body.pos + Point::from(ctrl.aim.a) * l).to_i32().into();
 124         // renderer.draw_line(pos, p, (0, 0, 255));
 125         // draw_cross(renderer, p);
 126     }
 127 }
 128
 129 fn draw_cross(renderer: &mut Renderer, p: (i32, i32)) {
 130     renderer.canvas().draw_line((p.0 - 5, p.1), (p.0 + 5, p.1)).unwrap();
 131     renderer.canvas().draw_line((p.0, p.1 - 5), (p.0, p.1 + 5)).unwrap();
 132 }
 133
 134 ////////// FALLING /////////////////////////////////////////////////////////////
 135
 136 struct FallState;
 137
 138 impl State for FallState {
 139     fn update(&mut self, body: &mut Body, ctrl: &Controller, _objects: &mut Objects, lvl: &Level, _dt: Duration) -> Option<Box<dyn State>> {
 140         body.vel += lvl.gravity;
 141         body.pos += body.vel;
 142
 143         match ctrl.mov.x {
 144             v if v < -0.9 && body.vel.x > -5.0 => { body.vel.x -= 0.5 }
 145             v if v > 0.9 && body.vel.x < 5.0 => { body.vel.x += 0.5 }
 146             _ => {}
 147         }
 148
 149         None
 150     }
 151 }
 152
 153 ////////// STANDING /////////////////////////////////////////////////////////////
 154
 155 struct StandState;
 156
 157 impl State for StandState {
 158     fn update(&mut self, body: &mut Body, ctrl: &Controller, _objects: &mut Objects, _lvl: &Level, _dt: Duration) -> Option<Box<dyn State>> {
 159         if let Some(wall) = &body.standing_on {
 160             if ctrl.jump.is_pressed && !ctrl.jump.was_pressed {
 161                 if ctrl.mov.to_point().length() < 0.1 {
 162                     body.vel = wall.normal().into();
 163                 } else {
 164                     body.vel = ctrl.mov.to_point();
 165                 }
 166                 body.vel *= 5.0;
 167                 body.pos += body.vel * 0.1;
 168                 body.standing_on = None;
 169                 return Some(Box::new(FallState))
 170             } else {
 171                 body.vel *= 0.9;
 172             }
 173         }
 174
 175         None
 176     }
 177 }