get rendering semi fixed

src/engine.rs

@@ -1,4 +1,4 @@
-const GAME_SIZE: (u32, u32) = (500, 800);
+const GAME_SIZE: (u32, u32) = (1200, 800);
 use std::{
     collections::HashMap,
     num::NonZeroU32,

src/engine/render.rs

@@ -35,13 +35,15 @@ impl<'buf, 'win> RenderCtx<'buf, 'win> {
     }
 
     pub fn clear(&mut self, color: u32) {
-        self.rect(0, 0, self.win_size.0, self.win_size.1, color)
+        self.rect(0, 0, self.context_size.0, self.context_size.1, color)
     }
 
-    // draw a rectangle in the context
-    //
-    // coordinates are relative to the context
-    pub fn rect(&mut self, x: u32, y: u32, width: u32, height: u32, color: u32) {
+    /// draw a rectangle in the context
+    ///
+    /// coordinates are relative to the context
+    ///
+    /// does not check against overflows
+    pub fn rect_unchecked(&mut self, x: u32, y: u32, width: u32, height: u32, color: u32) {
         // position in buffer coordinates and not relative coordinates
         let x_buf_pos = self.context_pos.0 + x;
         let y_buf_pos = self.context_pos.1 + y;
@@ -56,6 +58,25 @@ impl<'buf, 'win> RenderCtx<'buf, 'win> {
         }
     }
 
+    pub fn rect(&mut self, x: u32, y: u32, width: u32, height: u32, color: u32) {
+        if x >= self.context_size.0 || y >= self.context_size.1 || width == 0 || height == 0 {
+        } else {
+            let width = if (x + width) >= self.context_size.0 {
+                width.saturating_sub((x + width) - self.context_size.0)
+            } else {
+                width
+            };
+
+            let height = if (y + height) >= self.context_size.1 {
+                height.saturating_sub((y + height) - self.context_size.1)
+            } else {
+                height
+            };
+
+            self.rect_unchecked(x, y, width, height, color)
+        }
+    }
+
     pub fn force_present(self) {
         self.buffer.present().unwrap()
     }

src/main.rs

@@ -7,16 +7,13 @@ use engine::{
 
 fn main() {
     let mut engine = Engine::new();
-    let rect_id = engine.insert_into_world(Rc::new(MovingRect::square(0, 0, 1)));
+    let _ = engine.insert_into_world(Rc::new(MovingRect::new(0, 0, 50, 100)));
     engine
         .set_render_fn(|ctx, world, timer| {
             println!("t: {}", timer.game_time_passed());
             let obj = Rc::get_mut(world.get_mut(0)).unwrap();
-            obj.update_pos(
-                ((timer.game_time_passed().sin() + 1.0) * 256.) as u32,
-                ((timer.game_time_passed().cos() + 1.0) * 256.) as u32,
-            );
-            obj.display(ctx)
+            obj.move_obj(1, 0);
+            obj.draw_move(ctx)
             // Rect::square((timer.game_time_passed() * 20.) as u32, 0, 200).display(ctx);
         })
         .run();