js: only compute tween frames if time delta > 0

1 files changed, 7 insertions, 4 deletions

diff --git a/site/main.mjs b/site/main.mjs
index 46fea5f..f2012ab 100644
--- a/site/main.mjs
+++ b/site/main.mjs
@@ -117,10 +117,13 @@ function renderArena(robos, delta=0.0) {
     ctx.clearRect(0, 0, canvas.width, canvas.height);
 
     robos.forEach(robo => {
-        const [velx, vely] = [
-            robo.speedx, robo.speedy
-        ].map(x => timeScale * x);
-        const [x, y] = clamp(25, robo.x + velx, robo.y + vely, canvas.width, canvas.height);
+        let [x, y] = [robo.x, robo.y];
+        if (delta > 0) {
+            const [velx, vely] = [
+                robo.speedx, robo.speedy
+            ].map(x => timeScale * x);
+            [x, y] = clamp(25, robo.x + velx, robo.y + vely, canvas.width, canvas.height);
+        }
         renderRobo(ctx, x, y);
     });
 }