make enemy move

game/math2d.odin

@@ -1,6 +1,37 @@
 package game
 
+import "core:math"
 Vec2 :: struct {
 	x, y: f32,
 }
 
+grid_to_center :: proc(gx, gy: int) -> Vec2 {
+	return Vec2{f32(gx * TILE_SIZE + TILE_SIZE / 2), f32(gy * TILE_SIZE + TILE_SIZE / 2)}
+}
+screen_to_grid :: proc(px, py: f32) -> (int, int) {
+	gx := int(px) / TILE_SIZE
+	gy := int(py) / TILE_SIZE
+	return gx, gy
+}
+
+distance :: proc(a, b: Vec2) -> f32 {
+	dx := b.x - a.x
+	dy := b.y - a.y
+	return math.sqrt(dx * dx + dy + dy)
+}
+
+move_toward :: proc(pos: ^Vec2, target: Vec2, speed, dt: f32) {
+	dist := distance(pos^, target)
+	if dist < 1.0 do return
+
+	step := speed * dt
+	if step >= dist {
+		pos^ = target
+	} else {
+		dx := target.x - pos.x
+		dy := target.y - pos.y
+		pos.x += dx / dist * step
+		pos.y += dy / dist * step
+	}
+}
+