Workshop › Scorched Earth-style Artillery › Step 12 of 23

Falling tanks

What we are doing

A tank whose ground was blown away should not float. Each frame, a tank above the ground falls 2 pixels, until it lands on the ground again.

```js
const FALL = 2 // pixels per frame a tank drops when the ground under it is gone

  for (const t of tanks) {
    if (t.y < groundAt(t.x)) t.y = Math.min(groundAt(t.x), t.y + FALL) // nothing under it: it falls
    else t.y = groundAt(t.x)
  }
```

What it means

t.y < groundAt(t.x) means the tank is above the ground (y grows downward).
Math.min stops the fall exactly on the ground, not a pixel below.
Otherwise the tank simply sits on the ground.

Your turn

Under MAX_POWER, write FALL.
At the top of update, let the tanks fall.

Skills: Velocity and gravity

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