Workshop › Missile Command-style Defense › Step 5 of 35

Rubble

What we are doing

Now the drawing reads the city objects: a standing city is a tall blue block, a destroyed one flat grey rubble.

```js
for (const c of cities) {
  ctx.fillStyle = c.alive ? '#38bdf8' : '#44403c'
  ctx.fillRect(c.x - 16, GROUND - (c.alive ? 14 : 4), 32, c.alive ? 14 : 4)
}
```

What it means

• The loop now walks the cities objects; c.x is the city's middle.
• a ? b : c is a short "if": blue when alive, dark grey otherwise.
• The height is 14 when alive and 4 when not; GROUND - height keeps both standing on the ground.

Your turn

In draw, replace the city part (the fillStyle line and the for loop) with the new loop.

Skills: Drawing on a canvas

← Cities that can fall Move towards a point →

All steps

1. Six cities to protect
2. Your missile base
3. Draw again and again
4. Cities that can fall
5. Rubble
6. Move towards a point
7. Launch an enemy missile
8. One missile a second
9. Missiles on their way
10. Smoke trails
11. Impact
12. Fire an interceptor
13. Click the sky
14. Interceptors fly
15. An explosion that grows and shrinks
16. Explode on arrival
17. Draw the explosions
18. Impacts explode too
19. Caught in the blast
20. Chain reactions
21. Only your explosions count
22. Points for every missile
23. Show the score
24. Limited ammo
25. Waves
26. Each wave is harder
27. The end of a wave
28. The end
29. Play again
30. Wave, ammo and messages
31. Launch from anywhere
32. Some missiles will split
33. Split into three
34. A high score
35. Build it yourself: a crosshair