Bullet code for asteroids game
if you use this please put this in your code (not required)
// https://github.com/wsDev0/Bullet-Code-Put this before everything (replace your other variables that have same name)
//List of bullet attributes
var lastTheta = [];
var bulletx = [];
var bullety = [];
var lastx = [];
var lasty = [];
var bulletShot = false;
// the interval of which you can shoot bullets
var bulletInterval = 0; any where after variables put this -
bulletInterval -=dt;
if (keyIsDown(32)){ //spacebar
if(bulletShot==false && bulletInterval <= 0) {
//pushes the last position and data of the ship into lists which each bullet needs
lastTheta.push(theta);
lastx.push(x);
lasty.push(y);
bulletx.push(x);
bullety.push(y);
// set bulletShot to false if you want to be able to auto shoot
bulletShot = true;
bulletInterval = 5; // the time of which you have to wait to shoot (another/a) bullet after you shot one
}
}
else {
//makes it so when you press space again you can shoot (but bulletInterval has to be 0)
bulletShot = false;
}after display function put this -
// display bullet(s)
for(f=0;f<bulletx.length;f++) {
//move bullet in last direction facing
if(bulletx[f]<width && bulletx[f]>0 && bullety[f]<height && bullety[f]>0) {
//adds the bulletx and bullety of each bullet
bulletx[f] += (cos(lastTheta[f])*40) // change 40 to something else if you want your bullet to be faster or slower
bullety[f] += (sin(lastTheta[f])*40) // change 40 to something else if you want your bullet to be faster or slower
drawPoint(bulletx[f], bullety[f]) // this draws the bullet with a simple point function ( you can make it something else )
}
// remove bullet if goes off screen (or hits astroid later)
else {
// splice removes something from a list, in this case, it is removing f (the picked bullets data (by index) from lists) if the current bullet goes off screen
// splices syntax (in my words) is: list.splice(from (index/int), to (index/int, always put 1 if you want it only to delete 1 object))
lastTheta.splice(f, 1);
lastx.splice(f, 1);
lasty.splice(f, 1);
bulletx.splice(f, 1);
bullety.splice(f, 1);
}
}