Limit ship max speed

html/images/space.svg

@@ -76,6 +76,7 @@
     let friction = 0;
     let rotate = 0;
     let rotationSpeed = 0.25;
+    const maxSpeed = 100;
 
     const rules = document.styleSheets[0].cssRules;
 
@@ -112,9 +113,10 @@
       return [x, y];
     }
 
-    function fireBullet(x, y) {
+    function fireBullet(x, y, velocity) {
       const degrees = getRotate(gun);
       const radians = degrees * Math.PI / 180; // toFixed(15)?
+      const speed = 200; // meters per second
       const vx = -Math.sin(radians);
       const vy = Math.cos(radians);
       const bulletTimeout = 5000; // miliseconds
@@ -129,8 +131,8 @@
       const bullet = {
         x: x + vx * cannonLength,
         y: y + vy * cannonLength,
-        vx: vx,
-        vy: vy,
+        vx: vx * speed + velocity[0],
+        vy: vy * speed + velocity[1],
         time: bulletTimeout,
         node: bulletsContainer.appendChild(el)
       }
@@ -172,9 +174,11 @@
       if (delta >= 1000) {
         fps.innerText = frameCount;
 
-        info.innerText = 'bullets\nx\ty\tvx\tvy\n' + bullets.map((b, index) => {
-          return `${b.x.toFixed(2)}\t${b.y.toFixed(2)}\t${b.vx.toFixed(2)}\t${b.vy.toFixed(2)}`;
-        }).join("\n");
+        info.innerText = `velocity ${velocity}\n`
+          + 'bullets\nx\ty\tvx\tvy\n'
+          + bullets.map((b, index) => {
+            return `${b.x.toFixed(2)}\t${b.y.toFixed(2)}\t${b.vx.toFixed(2)}\t${b.vy.toFixed(2)}`;
+          }).join("\n");
 
         zero = timestamp;
         frameCount = 0;
@@ -200,6 +204,13 @@
       velocityY = velocityY > 0 && velocityY + accelerationY < 0 ? 0 : velocityY + accelerationY;
       velocity = [velocityX, velocityY];
 
+
+      if (velocity[0] > maxSpeed) velocity[0] = maxSpeed;
+      else if (velocity[0] < -maxSpeed) velocity[0] = -maxSpeed
+
+      if (velocity[1] > maxSpeed) velocity[1] = maxSpeed;
+      else if (velocity[1] < -maxSpeed) velocity[1] = -maxSpeed
+
       const changeX = 0.001 * elapsed * velocityX;
       const changeY = 0.001 * elapsed * velocityY;
 
@@ -208,8 +219,8 @@
         bullets[index].time -= elapsed;
 
         if (bullets[index].time > 0) {
-          bullets[index].y += 0.1 * elapsed * bullets[index].vy;
-          bullets[index].x += 0.1 * elapsed * bullets[index].vx;
+          bullets[index].y += 0.001 * elapsed * bullets[index].vy;
+          bullets[index].x += 0.001 * elapsed * bullets[index].vx;
 
           let [bx, by] = wrapPos(bullets[index].x, bullets[index].y)
           bullets[index].x = bx;
@@ -254,7 +265,8 @@
           if (!spacePressed) {
             spacePressed = true;
             const [x, y] = getTranslate(hitbox);
-            fireBullet(x, y);
+            // fireBullet(x, y);
+            fireBullet(x, y, velocity);
           }
           break;
         case "KeyW":