commit 11af77567300674d3d7d4e89362a4ebaddbf5466
Author: Joseph Ferano <joseph@ferano.io>
Date:   Sun Aug 25 10:04:09 2024 +0700

    First commit with asteroid moving and rotating

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d5a2b65
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/asteroids-odin
diff --git a/game.odin b/game.odin
new file mode 100644
index 0000000..7a26c74
--- /dev/null
+++ b/game.odin
@@ -0,0 +1,86 @@
+package asteroids
+
+import rl "vendor:raylib"
+import "core:math"
+import "core:fmt"
+
+SCREEN_WIDTH : i32 = 1280
+SCREEN_HEIGHT : i32 = 720
+
+SCALE: f32 = 0.5
+SHIP_W: f32 = 70 * SCALE
+SHIP_H: f32 = 100 * SCALE
+
+THRUST_SPEED : f32 = 0.03
+ANGULAR_SPEED : f32 = 2.5
+
+Vec2 :: [2]f32
+
+GameState :: struct {
+    ship_pos: Vec2,
+    ship_angle: f32,
+    ship_vel: Vec2,
+    dt: f32,
+}
+
+rotate_vec2 :: proc(v : Vec2, angle: f32) -> Vec2 {
+    return {
+        v.x * math.cos(angle) - v.y * math.sin(angle),
+        v.x * math.sin(angle) + v.y * math.cos(angle),
+    }
+}
+
+get_ship_shape :: proc(s : GameState) -> (Vec2, Vec2, Vec2, Vec2) {
+    v1 := rotate_vec2({ SHIP_H*0.5,   0},          s.ship_angle) + s.ship_pos
+    v2 := rotate_vec2({-SHIP_H*0.5,  -SHIP_W*0.5}, s.ship_angle) + s.ship_pos
+    v3 := rotate_vec2({-SHIP_H*0.5*0.5, 0},        s.ship_angle) + s.ship_pos
+    v4 := rotate_vec2({-SHIP_H*0.5,   SHIP_W*0.5}, s.ship_angle) + s.ship_pos
+    return v1, v2, v3, v4
+}
+
+main :: proc() {
+    rl.SetTraceLogLevel(.ERROR)
+    rl.InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "Asteroids")
+
+    s := GameState{{0,0}, -math.PI / 2, {0,0}, rl.GetFrameTime()}
+    s.ship_pos = {600, 350}
+
+    bw := f32(SCREEN_WIDTH)
+    bh := f32(SCREEN_HEIGHT)
+
+    for !rl.WindowShouldClose() {
+        s.dt = rl.GetFrameTime()
+        if rl.IsKeyDown(.D) {
+            s.ship_angle += ANGULAR_SPEED * s.dt
+        }
+        if rl.IsKeyDown(.A) {
+            s.ship_angle -= ANGULAR_SPEED * s.dt
+        }
+        if rl.IsKeyDown(.W) {
+            s.ship_vel.x += math.cos(s.ship_angle) * THRUST_SPEED * s.dt
+            s.ship_vel.y += math.sin(s.ship_angle) * THRUST_SPEED * s.dt
+        }
+
+        s.ship_pos += s.ship_vel * (5000 * s.dt)
+
+
+        if s.ship_pos.x + SHIP_W < 0  { s.ship_pos.x = bw + SHIP_W}
+        if s.ship_pos.x - SHIP_W > bw { s.ship_pos.x = SHIP_W}
+        if s.ship_pos.y +  < 0  { s.ship_pos.y = bh}
+        if s.ship_pos.y > bh { s.ship_pos.y = 0}
+
+        rl.BeginDrawing()
+        rl.ClearBackground(rl.BLACK)
+
+        // Draw ship
+        v1, v2, v3, v4 := get_ship_shape(s)
+        rl.DrawLineEx(v1, v2, 1, rl.WHITE)
+        rl.DrawLineEx(v2, v3, 1, rl.WHITE)
+        rl.DrawLineEx(v3, v4, 1, rl.WHITE)
+        rl.DrawLineEx(v4, v1, 1, rl.WHITE)
+
+        rl.EndDrawing()
+    }
+
+    rl.CloseWindow()
+}