2 files changed, 46 insertions, 2 deletions
diff --git a/Cargo.toml b/Cargo.toml
index 2858233..9c0202e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+ggez = "0.5.1"
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..d295f3a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,46 @@
-fn main() {
-    println!("Hello, world!");
+use ggez;
+use ggez::event;
+use ggez::graphics;
+use ggez::nalgebra as na;
+
+struct MainState {
+    pos_x: f32,
+}
+
+impl MainState {
+    fn new() -> ggez::GameResult<MainState> {
+        let s = MainState { pos_x: 0.0 };
+        Ok(s)
+    }
+}
+
+impl event::EventHandler for MainState {
+    fn update(&mut self, _ctx: &mut ggez::Context) -> ggez::GameResult {
+        self.pos_x = self.pos_x % 800.0 + 1.0;
+        Ok(())
+    }
+
+    fn draw(&mut self, ctx: &mut ggez::Context) -> ggez::GameResult {
+        graphics::clear(ctx, [0.1, 0.2, 0.3, 1.0].into());
+
+        let circle = graphics::Mesh::new_circle(
+            ctx,
+            graphics::DrawMode::fill(),
+            na::Point2::new(self.pos_x, 380.0),
+            100.0,
+            2.0,
+            graphics::WHITE,
+        )?;
+        graphics::draw(ctx, &circle, (na::Point2::new(0.0, 0.0),))?;
+
+        graphics::present(ctx)?;
+        Ok(())
+    }
+}
+
+pub fn main() -> ggez::GameResult {
+    let cb = ggez::ContextBuilder::new("super_simple", "ggez");
+    let (ctx, event_loop) = &mut cb.build()?;
+    let state = &mut MainState::new()?;
+    event::run(ctx, event_loop, state)
 }