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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
Alexandre, x=0, y=0 is on the top left corner of the screen. If you want to walk or jump on the y axis you need to use negative values
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Hello, I am newbie in Stencyl. Thyltin two questions and request help to clarify, being:
1) An actor is instantiated (placed in the scene) considering its center or its upper left corner?
2) Where is the coodenada 0.0 (x = 0, y = 0) in the scene? Is centered on the screen or in the upper left corner of the screen?
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Lol, whoops. I accidentally made it so when I press fire, my ship flies up instead of the bullets. :o
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I wrote the code correctly but when I press fire, The bullets don't appear
What should I do?
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so under my keyboard when I choose the choose control, neither action 1 or action 2 pops up. How do I fix it?
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if ur bullets stay still
make sure "bullets" is not affected by gravity
go to physics
actor type "normal"
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