Invincibility Frames

[lawatson]

Make a sprite for the health bar which is 1 pixel, and then draw it with the length of the maximum length / max HP * HP.

[LoneTree_tv]

How do you change the length of the sprite?

[lawatson]

image_xscale = x

it's multiplicative, so if you choose 1, it'll show the sprite, if you choose 2, it'll double the length, -1 will reverse the sprite, etc.

EDIT: Or actually, you'd probably rather just wanna put in the draw event:

draw_sprite_ext(spr_healthbar,0,x,y,image_xscale,1,0,c_white,1)

Replace the variables with whatever.

[LoneTree_tv]

Alright, I tried using the draw event, which I've never used before, and ran into some problems

I only wrote this:

draw_sprite(HPBar,0,10,10)

and neither the sprite nor the boss appears.

also, just now, i tried

hpbar=draw_sprite(HPBar,0,10,10);
hpbar.image_xscale=500/20*hp

the boss and hp bar did not show, and the players sprite got stretched instead.

EDIT: Oops, didn't see your edit. Tried it, and it still didn't work. what should I put for the image scaling if the max hp is 20 and I want the length to be 500? I think the fact that I put "500/20*hp" is what screwed everything up.

EDIT2: Wow, I'm incredibly stupid. I replaced spr_healthbar with my sprite name, and that fixed it. But the boss still doesn't seem to want to exist. By that I mean it's invisible. It's still shootable if you can guess where he is.

EDIT3: Once again, I'm terrible. I just put in draw_self(); before the other line and everything worked perfectly.

[lawatson]

Yeah, maybe I should have also said that you should put in draw_self() when using the draw event, but otherwise, there you go!

[LoneTree_tv]

Thanks 

I also wanted to know how to make cherries rotate around the boss, but I scratched the idea as a whole. It'd still be nice to know how, if you know.

[Katz]

Thanks 

I also wanted to know how to make cherries rotate around the boss, but I scratched the idea as a whole. It'd still be nice to know how, if you know.

I would do either paths or move_towards_point code(s) with a 360 rotation

I guess the first one works better if math is hard

[LoneTree_tv]

Math is ezpz, and I don't know how to use paths

But how would that work in code?

with deliciousFruit {
move_towards_point(boss.x,boss.y,90) }

?

[Derf]

off the top of my head something like this

make a special fruit object:

Code: [Select]

CREATE EVENT:
cx = boss.x
cy = boss.y
rad = 12; //or whatever you want the radius to be
spd = 8;//or whatever you want the rotational speed to be
ang = 90;//or whatever you want the starting ang of the object to be

Code: [Select]

STEP EVENT:
ang = ang mod 360;//this makes it so that the ang is always between 0 & 360

if(ang < 0) {
     ang += 360;
}

x = cx + rad * cos(degtorad(ang)); //make sure cherry is at correct point in rotation
y = cy - rad * sin(degtorad(ang));

ang += spd; //rotate cherry

cx = boss.x;
cy = boss.y; //update the centre points so that if your boss is moving, the cherries move with it


[LoneTree_tv]

That looks incredibly complicated.
Also, you didn't use the move_towards_point thing, telling me there's probably a different method? I'd like to know just in case. Thanks

[Katz]

I 100% recommend derf's method in this instance. move_towards_point would just be simple and shitty imo.

[LoneTree_tv]

alright then. Thanks 

[Derf]

You only really need to mess with the create event variables to tweak it to fit your game so it shouldn't matter if you don't understand it 100%.

Generally there are more than one way of doing most things in Game Maker and it's just up to personal preference and optimization really.

[infern0man1]

A while back sand wrote this script for orbiting, I hope he won't mind I put it here:

Code: (orbit) [Select]

argument0=centerX; //the center x-coordinate for the orbit
argument1=centerY; //the center y-coordinate for the orbit
argument2=radius;
argument3=spinSpeed; //the speed the projectile is moving in the orbit
argument4=direction;
argument5=radiusSpeed; //the speed the projectile is moving along the radius (a speed of -1 would make the projectile move inwards)



x=centerX+lengthdir_x(radius+rad,direction+dir);
y=centerY+lengthdir_y(radius+rad,direction+dir);
dir+=spinSpeed;
rad+=radiusSpeed;


And in the projectile's step event:

Code: [Select]

orbit(centerX,centerY,radius,spinSpeed,direction,radiusSpeed);


You could set the defaults in the projectile's step event, but for me, when I set the spinSpeed in the step event, the projectiles will just speed up until it hits a certain speed, then slow back down, as if it were a sine wave. To avoid this, I usually just put in either a spawning object's alarm[_] event or the boss's alarm[_] event:

Code: [Select]

for(i=0;i<360;i+=360/[number]){
  a=instance_create([x value],[y value],cherry);
  a.centerX=a.xstart;
  a.centerY=a.ystart;
  a.radius=[number];
  a.spinSpeed=[number];
  a.direction=i;
  a.radiusSpeed=[number];
}


If you don't want the projectiles to move in towards the orbit's center, you can remove rad and radiusSpeed from each code or just set it radiusSpeed to 0.