lesson 2 - mrahmedcomputing.co.uk · lesson 2 spawning asteroids ... you now need to add a second...

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Bristol Metropolitan Academy – Computer Science and ICT Department 2017

Lesson 2

Spawning Asteroids

Open the Construct 2 file that you were working on last lesson.

Go to the “Project” menu. Insert the “SpawnPoint” object into the “Main” layer.

Click and drag. Same process as background and player ship

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Once you insert the “SpawnPoint” object; it should look like this.

Resize the “SpawnPoint” object and then insert 7 more. Then position them around the layout

(outside the black area). Your layout should look like the one below.

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Now insert the “AsteroidLarge” object from the Projects menu.

The Asteroid should be outside the layout.

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Navigate to the events sheet. Select “Add Event”. Select “System”, then select “Next”.

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Select “Pick random instance”. Then select “Next”.

You will then need to select the “SpawnPoint” object by clicking on the <click to choose> option.

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Select the “SpawnPoint” object. Then click on “Done”.

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A System Event that selects a random spawn point, should now be created in you events sheet.

“Right Click” on the event that you created (event 5) and “Add another condition”.

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Select “System”, then select “Next”.

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Select “Every X seconds”. Then select “Next”.

In this window. Type in:

random(5)

This sets a random number between 1 and 5.

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You should now have a system event with 2 conditions. The system should select a random

“SpawnPoint” every few seconds now.

Now you need to add actions for these events. Select “Add action”. Then Select “SpawnPoint” and

Next.

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Select “Spawn another object”. Then select “Next”.

Select the “AsteroidLarge” object by clicking on the <click to choose> option.

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Once you have chosen the “AsteroidLarge” object; set it so that is spawns on Layer “1”. Click Done.

Note: Layer was set to “1” because that is the number assigned to the

“Main” Layer.

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You now need to add a second action to this system event. Select “Add action”. Then select

“AsteroidLarge” and “Next”.

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Select “Set angle towards position”. Then select “Next”.

Type in the following into the X option:

PlayerShip.X

Type in the following into the Y option:

PlayerShip.Y

Then click on “Done”.

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Your system event should look like this.

Press “F5” to test and run your program.

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You should notice that the asteroids are moving too fast and do not bounce off of each other. To fix

this, first select the asteroid which is off the main layout.

When the asteroid is selected, the “Properties” menu for the object will be available on the left

hand side of the screen. Under the “Behaviours” option, change the Speed to “50” and change

Bounce to “Yes”.

Press “F5” to test the game.

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Asteroid Collisions

Navigate to the events sheet. Select “Add event”. The select “AsteroidLarge” and “Next”.

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Select “On collision with another object”. Then select “Next”.

Select the “PlayerShip” object by clicking on the <click to choose> option.

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Once you have chosen the “PlayerShip” object, click “Done”.

An event should then be created (Asteroid collision with Player Ship).

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On this event, select “Add action”. Then select “PlayerShip” and “Next”.

Select “Destroy”. Then “Done”.

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When the Player Ship collides with the Asteroid, the Player Ship with be destroyed.

If you press “F5” to test it, you will notice that the Player Ship does not appear again unless you

close the game and start again.

To make the Player Ship respawn again. Select “Add action” on the collision event (event 6). Then

select “System” and “Next”.

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Select “Wait”. Then “Next”.

Set the Seconds to “2”. Then click on “Done”.

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Again, on the collision event, select “Add action”. Select “System”. Then select “Done”.

Select “Create object”.

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Select the “PlayerShip” object by clicking on the <click to choose> option.

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Once you have chosen the “PlayerShip” object, set the layer to “1” and set X to “320” and Y to “240”

(X and Y coordinates for the centre of the layout). Click Done.

lesson 2 - mrahmedcomputing.co.uk · lesson 2 spawning asteroids ... you now need to add a second...

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