Land in the ring

Challenge 10 of 16

Two speeds, one place to arrive: the mover has to finish inside the grey ring in the corner at 320, 320. It begins at 40, 40 with 35 frames to cover the rest.

Set both speeds.

Your code JavaScript

Set both speeds.

Console print() output

0 / 35 frames · 400×400

Target

Yours

Results

Press Run to check your code

Penalties: none this run

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Lesson Down and Across

Which way is forward.

x counts across from the left, y counts downward from the top. That second one catches everybody: adding to y sinks a shape, and taking away from it makes it climb. A negative speed is not "backwards" — it is whichever direction that axis counts from.

Two numbers, no conversation.

x = x + speedX; and y = y + speedY; are two separate instructions, and neither knows the other exists. Equal steps happen to draw a 45 degree line; make the across step three times the down step and you get a long shallow drift instead. The angle is just the ratio of the two numbers — challenges 6 and 7 are the same code with the numbers swapped, and they look nothing alike.

Reading two at once.

The readout along the bottom now shows both numbers, on the target as well as on yours. Challenge 13 gives you nothing else: drag to a frame, read what each number has reached, and work backwards to the steps.