251,332
Views
Beginner
Level
117
Comments
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
Ok, so I am having trouble with the bullets colliding with the aliens, when i shoot the aliens they bullets just stick to it and nothing happens, how do i fix this? pls help... Thx
2
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?
2
If you spam Z and just keep shooting, it lags horribly and you even get graphical glitches.
I wonder how much you need to crash the game...
0
For anybody who has the problem of the bullets shooting down(off the screen)try changing the ydir to -1.
1
Hello, for those who are having problems with the ship flying instead of bullets! I suggest dem one looks at the block "push" it has to be selected "Last Created Actors"! Thanks
0
ATTENTION:!!!! SOLUTION: IF you had the problem with the BULLETS NOT FLYING. Appearing but not going anywhere and you had all the commands (x: self and stuff) correct, then check if you have set BULLETS in PHYSICS to NORMAL in GRAVITY. Had this problem myslef for ages and figured it out, just making it easier for people to find. Sorry for caps in advance. :D
0
IGNORE LAST COMMENT. I had Create [bullet] at (x: [x ] of [self] (y: [x ] of [self] instead of (y: {y ] of [self]. This should work for anyone who has the same problem.
2
When my ship is in the far left of the screen if I shoot my bullets, they start shooting at the top of the screen and they shoot lower and lower as I move right. Eventually they don't shoot at all. PLEASE HELP!!!!!
0
For everyone who is having the problem of the bullets staying in one place and your ship moves instead, this might help.
Under ship in events and in keyboard some might find that the push=self. It should be last created actor. I am unsure if gently makes much a difference, but i have mine on sharply and it works.
-1
