Workshop › Asteroids › Step 2 of 41

Where the ship is

What we are doing

The ship is an object: its position, the angle it faces and its velocity. resetShip puts it in the middle, facing up. Angles in JavaScript are in radians: a full turn is 2 * Math.PI.

```js
let ship

function resetShip() {
  ship = { x: canvas.width / 2, y: canvas.height / 2, angle: -Math.PI / 2, vx: 0, vy: 0 }
}

resetShip()
```

What it means

• The ship starts in the middle of the canvas (300, 225).
• Angle 0 points right; because y grows downwards, Math.PI / 2 points down and -Math.PI / 2 points up.
• vx and vy are its speed to the right and downwards, 0 for now.

Your turn

1. Above function draw() { write let ship and resetShip, followed by an empty line.
2. Above the draw() call at the bottom write resetShip().

Skills: Game states, Velocity and gravity

← Black space Which way it points →

All steps

1. Black space
2. Where the ship is
3. Which way it points
4. A triangle ship
5. Which keys are down?
6. Turning
7. The game loop
8. Thrust and drift
9. A little friction
10. A speed limit
11. Around the screen
12. Making a bullet
13. Fire!
14. Bullets fly
15. A lifetime for bullets
16. Making a rock
17. Four big rocks
18. Drawing the rocks
19. Jagged rocks
20. Drifting rocks
21. When do two circles touch?
22. Breaking a rock
23. Bullets hit rocks
24. Points
25. Show the score
26. Losing a life
27. A rock hits the ship
28. Show the lives
29. What time is it?
30. A moment of safety
31. Blink while safe
32. Waves of rocks
33. The next wave
34. Faster every wave
35. One function to start
36. Playing or over
37. Game over
38. Best score
39. GAME OVER
40. Play again
41. Build it yourself: hyperspace