Missile trouble

[InkBlotter]

First post, first game.

 

I started batari basic very recently. I downloaded all the examples, and they were awesome early on, until I started getting into missiles, where the code confused me, and everything started seeming more cryptic. The pinned example is weird considering I have to hold down the fire button to get the missile to fire, and I cannot figure out how to fix it.

 

Using another example, I've gotten collision detection and movement for my player sprite to work, but the missile eludes me. I need it to fire straight down and only stop when it hits something else.

 

Help, please?

Extraterrestrial.bas

[+Random Terrain]

In the file that you posted, which direction do you want the missile to go?

[InkBlotter]

I need it to go straight downwards until it hits the playfield.

[+Random Terrain]

I need it to go straight downwards until it hits the playfield.

 

I wasn't sure before I got your answer, so I started doing one shooting to the right, then one shooting down. Here are both:

 

Shooting Right

extraterrestrial_shoot_right_2013y_12m_01d_1213t.bas

extraterrestrial_shoot_right_2013y_12m_01d_1213t.bin

 

 

Shooting Down

extraterrestrial_shoot_down_2013y_12m_01d_1222t.bas

extraterrestrial_shoot_down_2013y_12m_01d_1222t.bin

[InkBlotter]

Oh golly, it works better than ever. Exact collision detection, screenedge detection, and the missile works perfect.

 

Thank you so so so so much. I will study this code obsessively. The screenedge finally makes perfect sense to me. Thank you for your help.

[+Random Terrain]

Oh golly, it works better than ever. Exact collision detection, screenedge detection, and the missile works perfect.

 

I got rid of collision detection in the two versions that I posted since you didn't seem to need it. I just stopped the ship and the missile from going down that far.