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Use your phone as a steering wheel to avoid the approaching traffic. Will you be the next super racer?

What bricks and objects do you need?

Create a new program and add the following objects from the media library:

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Now add these scripts to the obstacle object:

1. Step

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When your program starts set the color and size of your car.

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2. Step

Pick the set Y to-brick and set a value which places the object outside of your phone’s screen. For the x-position insert the “random function” which you find under the category functions in the formula editor. Set the limits of the random function to -700 and +700. Now your obstacle is randomly placed on the horizontal axis.

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3. Step

To make the obstacle move from the top to bottom you need the set velocity to-brick. Set the y-value to a random number between -500 and -1500.

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4. Step

When the program starts the obstacle is placed at the top and moves with a random velocity down the screen. This only happens one time. So we need to put it on top again when it leaves the screen. Pick the when becomes true-brick and insert “position_y < -600”. You can find “position_y” in the object category and “<” in the logic category while in the formula editor. So if your obstacle is outside your screen, this script starts. In this case set the obstacle to its start position again.

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5. Step

Add another set velocity to-brick to make your obstacle go down the screen again. Set the y-value to a random number between -500 and -1500 so every time the obstacle has a different velocity.

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Now add these scripts to the car object:

6. Step

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When your program starts you first have to change the size of your car. Then place it on the screen at a certain position.

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7. Step

Add a forever loop-brick because the car needs to change it’s position all the time. Pick the change x by-brick because the car should move only on the horizontal axis. Go to the formula editor and insert “inclination_x” which you find under the category device. In order to move the car smoothly according to the phones inclination, multiply the sensor value by minus 4.

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8. Step

Insert a when becomes true-brick with the condition: “touches_edge OR touches_object(Obstacle)”. You find these properties under the category object respectively in the category logic in the formula editor. At last insert two switch to looks-bricks and one wait-brick. So every time your car hits the edge or an obstacle it changes it’s look for a short period of time.

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