Crash Course 2: Invaders - Part 10

by Hectate (Updated on 2015-05-02)

Part 10: Enabling Our Ship to Fire Bullets

Step 73: Our next Event will create a Bullet Actor and set it in motion when the player presses a keyboard key. Click the + Add Event button, mouse over Input, and select Keyboard. Remember, we should already be in the Ship's events screen to create this.

Tip: To make sure your bullets fire properly, make sure you remembered to set their Actor Type in the Physics tab to Normal. We covered this in Part 4, Step 26

Step 74: On the block that appears, set the control dropdown to action 1, as shown.

Step 75: Now we need to grab two blocks, one that creates our Bullet Actor and another that sends it on its way.

The first is under Scene -> Actors in the Palette. The second is under Actor -> Motion.

Select the Bullet Actor Type by clicking on the dropdown on the create Actor Type block, and in the blue push [Actor] block, change the [Self] field to [last created actor] and [gently] to [sharply]. Snap them together into the Event block, as shown.

Step 76: Next, we need to set where the Bullet is created and the direction it should travel in. For the x and y values, set them to x of self and y of self, which is the current position of the Ship on screen. This block is in Actor > Position. Alternatively, cClick on each dropdown (for x and y) to choose the x of self block from the Actor category in the Block Picker. Then switch the [x] to [y] in the second block, as shown.

Step 77: From here, we set the direction and force the Bullet Actor will launch at in the push [Last Created Actor] block. Set xDir to 0 (we only want the Ship to shoot bullets toward the Enemy Ships, which is up, not horizontally) and yDir to -1. Remember, that “up” on a computer screen is in the negative y direction. Lastly, set force to 40.

Test the game again, and press Action 1 to shoot your bullets (should be Z by default).

We now need to ensure our Bullet Actors are destroyed when they collide with the Enemy Ships and when they leave the screen.

Let’s continue to Part 11.

Disclaimer: Use comments to provide feedback and point out issues with the article (typo, wrong info, etc.). If you're seeking help for your game, please ask a question on the forums. Thanks!


0 1 week, 1 day ago
Low Five
0 1 month, 4 days ago
What key do you have to press to make the bullet spawn? I can't spawn the bullet.
1 6 months, 3 days ago
I can get the bullets to spawn, but they appear in the upper left corner of the screen, regardless of where the ship is on screen. I'm fairly sure I have the parameters set right [create bullets at (x: x-speed of ship y: y-speed of ship) at front] over [push last created actor sharply towards (x-dir:0 y-dir -1) at 40 force].

Hopefully I conveyed this as clearly as I could, and thank you for your help.

2 7 months, 3 days ago
Hi... ummm so my bullets arent even making it to the enemies. They stop about half way up the screen. I have checked everything 1000 times and cant find anything wrong with them. what should i do or where did i go wrong?
1 1 year, 2 weeks ago
While creating the bullet actor type It in the x block I can't change it to x of self or y of self how do I do that?
0 1 year, 3 months ago
Hi, I have a problem with my ship actor. I added it in and its size is really small. Ive also added all the events into this actor so I dont want to delete it. When I test the game the bullets are really big but the ship really small. I go in the Level 1 tab and I turn the grid on the charecter is in the top-left corner of one small square. Please help me.


2 1 year, 8 months ago
There is no create actor in the Scene>Actors !!!! Only creat actor in next scene
-1 2 years, 2 months ago
hi, anybody can help me?... why is it my bullets are appearing on the left top corner of the screen when I press on "z"? what should i do about this?

0 2 years, 5 months ago
Our ship only goes left, you cannot control it, and it is being all glitchy to the left. We also cannot shoot bullets, and we still have not found an answer to our question. Anything that could cause that?

0 2 years, 6 months ago

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