From 544c030b80d4d7b9a3b00711ff21b2592275a7e8 Mon Sep 17 00:00:00 2001
From: Justin Worthe <justin@worthe-it.co.za>
Date: Tue, 6 Mar 2018 21:05:29 +0200
Subject: Bugs walking to the middle of the screen slowly

---
 src/entities/bug.rs | 12 +++++++++++-
 src/geometry.rs     | 38 ++++++++++++++++++++++++++++++++++++++
 src/main.rs         | 11 ++++++++---
 3 files changed, 57 insertions(+), 4 deletions(-)

diff --git a/src/entities/bug.rs b/src/entities/bug.rs
index 6b39e8a..d2d5c2e 100644
--- a/src/entities/bug.rs
+++ b/src/entities/bug.rs
@@ -6,6 +6,8 @@ pub struct Bug {
     pub alive: bool
 }
 
+const SPEED: f64 = 75.;
+
 impl Bug {
     pub fn new(x: f64, y: f64, facing: f64) -> Bug {
         Bug {
@@ -19,7 +21,13 @@ impl Bug {
     }
 
     pub fn advance(&mut self, seconds: f64) {
-        //TODO, add some motion
+        self.rotation = (-self.pos).angle();
+        let distance = SPEED*seconds;
+        let delta_pos = Vec2d {
+            x: distance * self.rotation.cos(),
+            y: distance * self.rotation.sin()
+        };
+        self.pos = self.pos + delta_pos;
     }
 
     pub fn click(&mut self, point: Vec2d) {
@@ -29,6 +37,8 @@ impl Bug {
     }
 
     fn touches(&self, point: Vec2d) -> bool {
+        let rx = 35.;
+        let ry = 16.;
         self.pos.distance(point) <= 45. // Some better hit box modelling might be nice?
     }
 }
diff --git a/src/geometry.rs b/src/geometry.rs
index e9d534a..be903d7 100644
--- a/src/geometry.rs
+++ b/src/geometry.rs
@@ -1,3 +1,5 @@
+use std::ops::*;
+
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub struct Vec2d {
     pub x: f64,
@@ -8,4 +10,40 @@ impl Vec2d {
     pub fn distance(&self, other: Vec2d) -> f64 {
         ((other.x-self.x).powi(2) + (other.y-self.y).powi(2)).sqrt()
     }
+    pub fn angle(&self) -> f64 {
+        self.y.atan2(self.x)
+    }
+}
+
+impl Add for Vec2d {
+    type Output = Vec2d;
+
+    fn add(self, other: Self) -> Self {
+        Vec2d {
+            x: self.x + other.x,
+            y: self.y + other.y
+        }
+    }
+}
+
+impl Sub for Vec2d {
+    type Output = Vec2d;
+
+    fn sub(self, other: Self) -> Self {
+        Vec2d {
+            x: self.x - other.x,
+            y: self.y - other.y
+        }
+    }
+}
+
+impl Neg for Vec2d {
+    type Output = Vec2d;
+
+    fn neg(self) -> Self {
+        Vec2d {
+            x: -self.x,
+            y: -self.y
+        }
+    }
 }
diff --git a/src/main.rs b/src/main.rs
index 64ac0c2..960197f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,11 +2,11 @@ extern crate gate;
 
 use gate::{App, Audio};
 use gate::app_info::AppInfo;
-use gate::input::{InputEvent, KeyCode, MouseButton};
+use gate::input::*;
 use gate::renderer::{Renderer, Affine};
 
 mod asset_id { include!(concat!(env!("OUT_DIR"), "/asset_id.rs")); }
-use asset_id::{AssetId, SpriteId, TileId, MusicId, SoundId};
+use asset_id::*;
 
 mod geometry;
 use geometry::*;
@@ -64,9 +64,14 @@ fn main() {
     let info = AppInfo::with_app_height(1000.).title("Bug Basher").build();
     gate::run(info, BugBasherGame {
         bugs: vec!(
-            Bug::new(0., 0., 0.),
             Bug::new(500., 200., 0.3),
             Bug::new(-200., -200., 1.5),
+            Bug::new(-1000., 200., 0.),
+            Bug::new(1200., 0., 0.3),
+            Bug::new(-1300., 0., 1.5),
+            Bug::new(0., 1100., 0.),
+            Bug::new(0., -1500., 0.3),
+            Bug::new(300., -1200., 1.5),
         )
     });
 }
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