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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.
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.
117 Comments
I am also trying to fire the bullets but they stay still, what did you figure out? By your quick reply to figuring it out I feel like I'm missing something obvious...
I have when action 1 is pressed,
create bullet at (x: x of self y: y of self) at Middle
push Last Created Actor sharply towards xdir:0 and ydir: -1 at 40 force
0
If your bullets are only firing on part of the screen -
go to the ship's keyboard event
in the create bullet at x.... make this x-center and y-center of self
or
x(on screen)
-1
Ok - I didn't see it in comments BUT - if your bullets are not SPAWNING...
Make sure the above is done under SHIP events, NOT under bullet events...
0
Another thing to look for if your bullets aren't firing...the 'push' block should come from Scene > Actors not Scene > Game Flow (which has 'in the next scene' at the end of the block).
0
so my ship is staying to the left what did I do wrong it fires lasers and such but it is staying to the left.
1
