Danmakufu Q&A/Problem thread number 4

[Marco]

AMAZING! it's useful for me! Well... it was useful some time ago, I'll thouth "if something like this exist I can ahhh so... yes! and then... perfectly I am a genious! (call my brother) I'm genializing!" [Yes when I talk I use say all that things...] HOWEVER I thinked it was impossible and i've resolved (I think[I don't remember{I like lasers}])

Ah my spellcard is complete, now (not now) I may (may?) create a topic for my scripts! [and play guess the spellcard!]

[Beef Owl]

...whoops, my bad, thanks for the correction.

Dividing it by 0 of course :V

Not to criticize, but wouldn't dividing by 0 give you an undefined value? :V

[Helepolis]

Object lasers don't use Obj_SetSpeed or ObjShot_SetPenetration, don't include them. There's also no reason to set delay to zero.

My Remilia lasers use both lasers to damage the enemies and enemy enumeration loops to spawn explosions on their position. You can just copy either code for your laser.

Oh, thought penetration worked, because if I would put penetration to 1, the laser would hit once then immediately disappear (brrr sound also confirms this).

I'll be in your debt. I'll try to look and learn before blatantly copying =S

[GenericTouhouFailure]

Dividing it by 0 of course :V

Wrong. START with 0.
I mean 0?3=0
0?219038219038109 = 0
Rite?
I'm such a jerk :V

[DarkOverord]

I love how I make a really complicated spellcard with many random variables, and etc. Yet angles and lasers? Well. THAT'S COMPLETELY DIFFERENT!
http://www.majhost.com/gallery/DarkOverord/Other/SS2/Toehoes/damnyouangles.png
Now it's nice the lasers are aiming at the player to the same point. But this isn't exactly what I wanted, hang on I'll get a shot if you hold still.
http://www.majhost.com/gallery/DarkOverord/Other/SS2/Toehoes/aimingforlikethis.png

That's kind of what I want, but basically for ANY angle. So say you're at the top right (Like in my pic and move down), I only want the laser to move towards where the player WAS. I'm sure you guys will know what to do. Here's the green laser script:

Code: [Select]

let x=0;
let ANG=270;
let z=0;
let v=1;
while(x<6){
CreateLaserC(11+x,GetX,GetY,10,80,188,0);
SetShotDirectionType(PLAYER);
SetLaserDataC(11+x,0,2+z,ANG*v,2*v,0,2);

SetLaserDataC(11+x,40,0,0,0,0,2);
SetLaserDataC(11+x,50,4,0,0,0,2);

y=y+10;
z++;
if(y>20){y=0;z=0;v=-1;}
x++;
}
FireShot(11);FireShot(12);FireShot(13);FireShot(14);FireShot(15);FireShot(16);z and v are just arbitrary values that change :V

[Iryan]

I'd do it with OBJ_SINUATE_LASER. Parse the player's position to the laser at the beginning of the task, then make it hom in on him.


Alternatively, you could do the math. Gimme some minutes...

[DarkOverord]

I'd do it with OBJ_SINUATE_LASER. Parse the player's position to the laser at the beginning of the task, then make it hom in on him.


Alternatively, you could do the math. Gimme some minutes...

I suppose via the maths route I could set it back to Absolute and then sort it that way. It'd be a bit fun mind. Time to look up a function~ Even if I don't use it :3c

[Lord Phantasm Satori]

what causes the plural, single, stage, etc. selections to not work? I can still use directory, but the other options crash. any ideas on what it could be?

[Naut]

Many things cause stuff to not work. Post scripts.

[Iryan]

what causes the plural, single, stage, etc. selections to not work? I can still use directory, but the other options crash. any ideas on what it could be?

You mean you entire danmakufu main menu is crashing?

If so, first delete the "script_index.dat" file in your danmakufu folder and look if the error persists.

To prevent it from happening again, look for any script that you added or edited since the last time when you could access the other menu parts. With all of these, check if there is a typo or something in the script head (everything before script_enemy_main). If you have to narrow it down, try removing whole folders. Make sure that you always delete the new "script_index.dat" after each time you encountered this error.


Several things in the script head can make danmakufu store faulty script information in the dat file, making the program crash whenever it accesses the directory the script is inside. The plural, single etc selections in the menu will make danmakufu access all folders to check for the script type, making it crash every single time if there is a problematic script.

[DarkOverord]

So I was looking you the Obj stuff for what I wanted, I still see a problem, every laser is going to require a different angle, unless now you're gonna tell me there's a way of getting obj lasers to home in on a specific XY point? :C

....Nevermind I just got it. I think. You're implying I get the player location, THEN push that into a task with OBJ_SINUATE_LASER, Get the end of the laser, then calculate the angle from there? :V!? Say yes/no/almost? (Also the idea of lasers homing in at an XY ordinate only without angles would be awesome!)

[Formless God]

Explanations.

Thanks a lot ! I was wondering why that wasn't mentioned anywhere in the tutorials (though I probably have overlooked it).


Is there a function to detect the collision between an effect object and a bullet (any kind of bullet except for lasers) ? (you could've guessed what I was trying to accomplish now:

Spoiler:

is it possible to code a reflective barrier at all ?

)

And uh, what are the differences between a task, a subroutine and a function ?

[Iryan]

Is there a function to detect the collision between an effect object and a bullet (any kind of bullet except for lasers) ? (you could've guessed what I was trying to accomplish now:

Spoiler:

is it possible to code a reflective barrier at all ?

)

You can check the collision manually, for example with the GetPointToLine function I posted in the Miscelleanous Code Snippets thread.

And uh, what are the differences between a task, a subroutine and a function ?

A subroutine is just you taking a block of code you need to use several times in a script, so you substitute a single command for this block to save time.
A function is pratically the same, only with a) several parameters to modify this code block and b) the possibility to have it give you a return value, so that they can be used in a similar fashion to GetAngleToPlayer.

A task is structurally different. It is a defined piece of code that runs alongside the MainLoop{}. If you task doesn'T include a yield; in the task, it can be used similar to a function, but it is a little more CPU intensive. If you DO include yield;, well, refer to the intermediate tutorial. 

[Drake]

Is there a function to detect the collision between an effect object and a bullet (any kind of bullet except for lasers) ? (you could've guessed what I was trying to accomplish now:

Spoiler:

is it possible to code a reflective barrier at all ?

)

I suppose you could, but it sucks to work properly. It would be better off using math. What shape is it? Are you placing it anywhere in particular; are you moving it around?

[Beef Owl]

is it possible to code a reflective barrier at all ?

You could pretty easily adapt this code to work for a specific area instead of the screen borders (though you would have to put it in every bullet, which would suck) but I can't give you much in the ways of specifics because of how vague you're question is

Code: [Select]

while(Obj_BeDeleted(obj) == false)
{
        if(Obj_GetX(obj) < GetClipMinX)
        {
                  Obj_SetAngle(obj, 180 - Obj_GetAngle(obj));
                  Obj_SetX(obj,  Obj_GetX(obj) + 0.1);
        }

        if(Obj_GetX(obj) > GetClipMaxX)
        {
                  Obj_SetAngle(obj, 180 - Obj_GetAngle(obj));
                  Obj_SetX(obj,  Obj_GetX(obj) - 0.1);
        }
}

Not really sure if this is useful but hopefully it helps

[Formless God]

Ah ... no, this is different from the QED effect :<
The barrier should be a rectangle/square that is placed on the player and moves with the player.

[Drake]

You could do a circle if you want.

if( (Obj_GetX(obj) - GetPlayerX)^2 + (Obj_GetY(obj) - GetPlayerY)^2 < (radius)^2 ){ bounce; }

A square/rectangle would be

if( objx>plx-left && objx<plx+right && objy>ply-top && objy<ply+bottom ){ bounce; }

However because the bullets could bounce given any angle around the player (instead of a wall that you can only run into one side of), you would need to move the bullet that small amount like
objx += cos(atan2(objy-ply,objx-plx)); objy += sin(atan2(objy-ply,objx-plx)); or something like that.

[Kylesky]

Or you could use Collision_Line_Circle :V

[Drake]

I don't see how that would be better in this situation.

[Tarquinius]

I'm trying to make it so that a bullet will, when it hits the side of the screen, reflect off of it. This is the code I'm using:

Code: [Select]

task fire01{
let dir = 0;
let i = 0;
loop{
bullet01(GetEnemyX,GetEnemyY,3,dir,PURPLE12,5);
if(dir>=0 && i==0 && dir!=45){
dir++;
}
if(dir==45 && i==0){
dir--;
i = 1;
}
if(dir<=45 && i==1 && dir!=0){
dir--;
}
if(dir==0 && i==1){
dir++;
i = 0;
}
wait(2.5);
}
}

function bullet01(x,y,s,dir,g,d){
let obj01 = Obj_Create(OBJ_SHOT);
Obj_SetPosition(obj01,x,y);
Obj_SetSpeed(obj01,s);
Obj_SetAngle(obj01,dir);
ObjShot_SetGraphic(obj01,g);
ObjShot_SetDelay(obj01,d);

while(!Obj_BeDeleted(obj01)){
if(Obj_GetX(obj01)>GetClipMaxX){
Obj_SetAngle(obj01,rand(105,179));
}
yield;
}
}However, the problem is that, once one bullet is fired, the next bullet won't be fired until the first bullet has been deleted. Is there a way to make it so that the next bullet will fire before first is deleted?

[Drake]

function -> task

[Kylesky]

I don't see how that would be better in this situation.

he wants a rotating square-shaped barrier on the player that reflects bullets out, right?

Code: [Select]

let barrier_angle=0;
let barrier_width=20;

...

task bullet(blah, blah){
let obj=Obj_Create(OBJ_SHOT);
blah blah blah
while(!Obj_BeDeleted(obj)){
    if(Collision_Line_Circle(GetPlayerX+barrier_width*cos(barrier_angle), GetPlayerY+barrier_width*sin(barrier_angle), GetPlayerX+barrier_width*cos(barrier_angle+180), GetPlayerY+barrier_width*sin(barrier_angle+180), barrier_width, Obj_GetX(obj), Obj_GetY(obj), object_radius)==true){
    *insert reflection code here depending on barrier_angle*
    }
    yield;
}
}
@MainLoop{
    barrier_angle++; //blah
}

This makes a rotating square shaped collision-check area on the player...

if I remember correctly, the reflection code should look something like this...

Code: [Select]

angle=atan2(Obj_GetY(obj)-GetPlayerY, Obj_GetX(obj)-GetPlayerX);
if(angle>=barrier_angle-45 && angle<barrier_angle+45){angleb=barrier_angle;}
if(angle>=barrier_angle+45 && angle<barrier_angle+135){angleb=barrier_angle+90;}
if(angle>=barrier_angle+135 && angle<barrier_angle+225){angleb=barrier_angle+180;}
if(angle>=barrier_angle+225 && angle<barrier_angle+315){angleb=barrier_angle+270;}
Obj_SetAngle(obj, angleb*2-Obj_GetAngle(obj)+180);


[Chau]

Hi everyone,
how do you "shorten" the replay? When I played Concealed the Conclusion I noticed that the replay doesn't show the menu. "IsReplay" can be used to prevent that the menu appears but I think the keys you pressed in the menu still remain saved in the replay so that the replay shows some weird movements at the beginning.
Or am I wrong?

} // end of Engrish

[GenericTouhouFailure]

Hey guyz how do I nue line in DrawText?

[Demonbman]

Sorry Chau I have no idea,

Hey guyz how do I nue line in DrawText?

You have to make an entirely new DrawText

[Tarquinius]

function -> task

That worked, thank you.

[Drake]

Hey guyz how do I nue line in DrawText?

type
 in the text

wtf u doin

wtf u doin

[Demonbman]

type
 in the text

I thought that only worked in Dialog?

[Drake]

Oh whoops, thought that was what he meant. Might still work, but eh.

[Chronojet ⚙ Dragon]

Oh whoops, thought that was what he meant. Might still work, but eh.

Just tried it, didn't work.