Graal Forums - Simple Poly Line (to mouse)

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- - Simple Poly Line (to mouse) (https://forums.graalonline.com/forums/showthread.php?t=134261559)

scriptless

01-06-2011 12:53 AM

Simple Poly Line (to mouse)

Okay this is an easy one, but for some reason I cannot get a line to draw to the players mouse from a given x/y of a npc.. Any suggestions here, i know its top left, top right, bottom right, and bottom left for the order of cords.. or am i wrong here?

PHP Code:


		
			
//#CLIENTSIDE
function onMouseDown() {
  with ( findImg( 4000)) {  
    polygon = {
      mousex, mousey,
      mousex-(2/16), mousey-(2/16),
      x, y,
      x-(2/16),y-(2/16)
    };
    layer = 3;
  }
}

All I am trying to do is make a line draw from the npc to the mouse.. =/

It seems to be twisting, but i cant get the cords working right, grr !!

fowlplay4

01-06-2011 12:59 AM

Try swapping x, y with x-(2/16), y - (2/16)

and your explanation sounds misunderstood, it's from point to point to point.

scriptless

01-06-2011 01:03 AM

ohh.. guess your right on point-to-point.. hmm
line kinds dissapears at certain angles.. is this normal tho?

fowlplay4

01-06-2011 01:05 AM

Quote:

Originally Posted by scriptless (Post 1620595)

ohh.. guess your right on point-to-point.. hmm
line kinds dissapears at certain angles.. is this normal tho?

Well you're using layer 0-3, so you'd get better/pixel accuracy if you used layer 4 and up with mousescreenx and mousescreeny.

scriptless

01-06-2011 01:06 AM

Quote:

Originally Posted by fowlplay4 (Post 1620597)

Well you're using layer 0-3, so you'd get better/pixel accuracy if you used layer 4 and up with mousescreenx and mousescreeny.

Was not aware layers had a difference lol.. im trying to make this script plot a position on the level and draw a line to it.. so i can see the NPC's path of movement.. the npc will move along the line and pick another destination but i wanted to see it's path, you know..

12171217

01-06-2011 01:07 AM

Quote:

Originally Posted by fowlplay4 (Post 1620597)

Well you're using layer 0-3, so you'd get better/pixel accuracy if you used layer 4 and up with mousescreenx and mousescreeny.

It's a polygon, not a line with a width/height. Defining the points like that will only result in a proper "thickness" at two angles. The angle has to be compensated for using some trig.

Crow	01-06-2011 01:08 AM

http://forums.graalonline.com/forums...ight=draw+line

scriptless

01-06-2011 01:09 AM

So why does this NOT work?

PHP Code:


		
			
//#CLIENTSIDE

function onMouseDown() {

  this.angle = random(0,360); // angle

  this.distance = random(5,7); // distance

  this.nx = x + sin(this.angle) * this.distance;

  this.ny = y + cos(this.angle) * this.distance;

  with ( findImg( 4000)) {  

    polygon = {

      this.nx, this.ny,

      this.nx-(2/16), this.ny-(2/16),

      x-(2/16),y-(2/16),

      x, y

    };

    layer = 3;

  }

  chat = this.nx SPC this.ny;

}

The NPC chats the correct cords but does not move to draw poly properly..

12171217

01-06-2011 01:13 AM

Quote:

Originally Posted by Crow (Post 1620602)

http://forums.graalonline.com/forums...ight=draw+line

Also doesn't take into account the direction of the line. Again, needs trig.

scriptless

01-06-2011 01:14 AM

Quote:

Originally Posted by 12171217 (Post 1620606)

Also doesn't take into account the direction of the line. Again, needs trig.

I noticed that.. Downsider is the trig simple or no? I guess the line is not completly important but it's not drawing to the right cords when i used the above script.. the line is just for visual debugging so I guess it doesnt have to be perfect.

scriptless

01-06-2011 01:16 AM

Nvm, problem solved. I used the DrawLine() custom function and it worked perfectly.. hmm now to redo the other script I had and use this new-found information.

Thanks everyone for the help.

fowlplay4

01-06-2011 01:31 AM

Well just using 2 (ox, oy, tx, ty) points works fine as well.

cbk1994

01-06-2011 01:31 AM

Quote:

Originally Posted by 12171217 (Post 1620606)

Also doesn't take into account the direction of the line. Again, needs trig.

Sales made one a while back.

Quote:

Originally Posted by salesman (Post 1474047)

I came across this thread when trying to find out if there was a built in drawLine() function. However, I needed the width of the line to be the same regardless of angle and made this:

PHP Code:


		
			
//DrawLine( img_index, start_x, start_y, target_x, target_y, width_in_tiles, red, green, blue, alpha)

public function DrawLine( ind, sx, sy, tx, ty, wid, r, g, b, alph ) {

  temp.ang = getangle(tx - sx, ty - sy) + (pi/2);

  temp.wid = ( wid == NULL ? .1 : wid );



  with ( findImg(ind) ) {

    polygon = {

      sx, sy,

      tx, ty,

      tx + cos(ang)*wid, ty - sin(ang)*wid,

      sx + cos(ang)*wid, sy - sin(ang)*wid

    };

    red = ( r < 0 || r > 1 ? 0 : r );

    green = ( g < 0 || g > 1 ? 0 : g );

    blue = ( b < 0 || b > 1 ? 0 : b );

    alpha = ( alph <= 0 || alph > 1 ? 1 : alph);

    layer = 3;

  }

}

An example:

PHP Code:


		
			
DrawLine(200, 25, 25, 45, 45);

//Draws a black line of width .1 tiles from 25,25 to 45,45

or if you want to specify color, width and alpha:

PHP Code:


		
			
DrawLine(200, 25, 25, 45, 45, .3, 1, 0, 0, .5);

//Draws a semi-transparent red line of width .3 tiles from 25,25 to 45,45

fowlplay4

01-06-2011 01:39 AM

What's the reasoning for adding pi/2, getangle a fraud?

scriptless

01-06-2011 01:41 AM

This doesnt seem to be choosing the random correctly..

PHP Code:


		
			
//#CLIENTSIDE

public function DrawLine( ind, sx, sy, tx, ty, wid, r, g, b, alph ) { 

  temp.ang = getangle(tx - sx, ty - sy) + (pi/2); 

  temp.wid = ( wid == NULL ? .1 : wid ); 



  with ( findImg(ind) ) { 

    polygon = { 

      sx, sy, 

      tx, ty, 

      tx + cos(ang)*wid, ty - sin(ang)*wid, 

      sx + cos(ang)*wid, sy - sin(ang)*wid 

    }; 

    red = ( r < 0 || r > 1 ? 0 : r ); 

    green = ( g < 0 || g > 1 ? 0 : g ); 

    blue = ( b < 0 || b > 1 ? 0 : b ); 

    alpha = ( alph <= 0 || alph > 1 ? 1 : alph); 

    layer = 3; 

  } 

}  



function onMouseDown() {

    this.angle = random(this.angle-15,this.angle+15); // angle

    this.distance = random(5,7); // distance

    this.nx = x + sin(this.angle) * this.distance;

    this.ny = y + cos(this.angle) * this.distance;

    DrawLine(2000, this.nx, this.ny, x, y);

}

The angles are still wrong.. it's supose to pick a random angle within 15 degrees of current angle.. o_O but it's still 360 =/

cbk1994

01-06-2011 01:42 AM

It's in radians, not degrees.

PHP Code:


		
			
this.angle = random(this.angle-0.261,this.angle+0.261)

Google "# degrees to radians" if you need help converting.

You can also use degtorad but it's not recommended to use degrees in scripting anyway.

fowlplay4

01-06-2011 01:43 AM

edit: been said, but there is functionality in Graal to convert to and from it.

Functions:

degtorad(degrees)
radtodeg(degrees)

I.e:

this.angle = random(this.angle - degtorad(15), this.angle + degtorad(15));

scriptless

01-06-2011 01:50 AM

oh, i guess i learn somethign every day XD

12171217

01-06-2011 02:03 AM

Quote:

Originally Posted by fowlplay4 (Post 1620621)

What's the reasoning for adding pi/2, getangle a fraud?

You need the points to the left and the right of the line, not in front of it, so you have to subtract 90 degrees, or pi/2 radians.

WhiteDragon

01-06-2011 02:50 AM

PHP Code:


		
			
function degtorad(temp.d) {

  return temp.d*pi/180;

}



function radtodeg(temp.r) {

  return temp.r*180/pi;

}

For anyone interested.

A degree is a value between 0 and 360, which we can write as [0,360].
A radian is a value between 0 and 2*pi, which we can write as [0,2*pi].

This is how degtorad would work:

Start with [0,360].
Divide by 360, and get to [0,1].
Multiple by 2pi, and get to [0,2*pi].

(The way I wrote it in the code was divide by 180 then multiple by pi. Same thing.)

radtodeg would just be the opposite.

Also worth noting, 0 points to the right, and positive values rotate counterclockwise.

fowlplay4

01-06-2011 02:54 AM

Someone really needs to go through forum posts, categorize them, and organize them into a tutorial/documentation.

scriptless

01-06-2011 03:20 AM

New problem, move() only works first time then stops.. any particular reason behind this?

PHP Code:


		
			
function onMouseDown() {

  this.nx = x;

  this.ny = y;

  for ( i=0; i<3; i++ ) {

    this.angle = random(this.angle-0.522,this.angle+0.522); // angle

    this.distance = random(2,5); // distance

    this.nx2 = this.nx + sin(this.angle) * this.distance;

    this.ny2 = this.ny + cos(this.angle) * this.distance;

    move(x, y, x+5, y+5);

    DrawLine(2000+i, this.nx, this.ny, this.nx2, this.ny2);

    this.nx += sin(this.angle) * this.distance;

    this.ny += cos(this.angle) * this.distance;

  }

}

cbk1994

01-06-2011 03:22 AM

Quote:

Originally Posted by scriptless (Post 1620649)

New problem, move() only works first time then stops.. any particular reason behind this?

PHP Code:


		
			
function onMouseDown() {

  this.nx = x;

  this.ny = y;

  for ( i=0; i<3; i++ ) {

    this.angle = random(this.angle-0.522,this.angle+0.522); // angle

    this.distance = random(2,5); // distance

    this.nx2 = this.nx + sin(this.angle) * this.distance;

    this.ny2 = this.ny + cos(this.angle) * this.distance;

    move(x, y, x+5, y+5);

    DrawLine(2000+i, this.nx, this.ny, this.nx2, this.ny2);

    this.nx += sin(this.angle) * this.distance;

    this.ny += cos(this.angle) * this.distance;

  }

}

You can't stack moves on top of eachother like that. Use the option that gives an event when finished (8? check scripthelp) and in the onMovementFinished (if I recall correctly) event call move again.

scriptless

01-06-2011 03:24 AM

so something like

PHP Code:


		
			
function newmove() {

  if ( this.moved == false ) move(..);

  this.moved = true;

}



function onMovementFinished() {

  this.moved = false;

  newmove();

}

is what your saying?

fowlplay4

01-06-2011 03:25 AM

move doesn't work like that.

TServerNPC.move(float, float, float, int)
- moves the npc smoothly
- parameters:
delta x,
delta y,
time
options: cache type (0, 1-cache, 2-append) + blockcheck(4) + eventwhendone(8) + applydir(16)

move(dx, dy, time, flags);

I.e:

PHP Code:


		
			
//#CLIENTSIDE

function moveTo(tx, ty) {

  // Delta = Final - Initial

  temp.dx = tx - this.x;

  temp.dy = ty - this.y;

  temp.speed = 1; // Tiles per second

  temp.time = getDistance(this.x, this.y, tx, ty) / temp.speed;

  move(temp.dx, temp.dy, temp.time, 8); 

}



function onMovementFinished() {

  // Your other code..

}



function GetDistance(temp.x1, temp.y1, temp.x2, temp.y2) {

  temp.toreturn = (temp.x2 - temp.x1) ^ 2 + (temp.y2 - temp.y1) ^ 2;

  return (temp.toreturn) ^ .5;

}

scriptless

01-06-2011 03:28 AM

Quote:

Originally Posted by fowlplay4 (Post 1620652)

PHP Code:


		
			
//#CLIENTSIDE

function moveTo(tx, ty) {

  // Delta = Final - Initial

  temp.dx = tx - this.x;

  temp.dy = ty - this.y;

  temp.speed = 1; // Tiles per second

  temp.time = getDistance(this.x, this.y, tx, ty) / temp.speed;

  move(temp.dx, temp.dy, temp.time, 8); 

}



function onMovementFinished() {

  // Your other code..

}



function GetDistance(temp.x1, temp.y1, temp.x2, temp.y2) {

  temp.toreturn = (temp.x2 - temp.x1) ^ 2 + (temp.y2 - temp.y1) ^ 2;

  return (temp.toreturn) ^ .5;

}

hmm.. interesting i should have looked up syntax earlier lol.. i thought i was doing it strange.. but still would i do similar to how i posted before because of using move() wrong without the check if movement ended.. ?

WhiteDragon

01-06-2011 03:36 AM

Quote:

Originally Posted by scriptless (Post 1620653)

Your earlier code looks to me like it'd go on forever.

newmove -> onMovementFinished -> newmove -> onMovementFinished -> newmove -> ...

If you only want to do it a certain amount of times, you could track it in a this variable which you start at say, 3, and then decrease every time the movement is finished.

scriptless

01-06-2011 03:40 AM

it looks like i have alot more scripting to do haha .. oh well im bored anyways

yeah it's only suspose to plan 3 moves and then move the paths.. then im gonna need onwall checks .. gah

tho technically it's supose to continiously move.. maybe randomly pause a second or 2.. lol

12171217

01-06-2011 03:55 AM

move() is the worst interpolation system EVER created.

When I get my main CPU back, I'll write a REAL interpolation system. I've already written one for Delteria, and it looks lightyears ahead of "move" and reduces server strain a lot. A .25 timeout looks just as good as a .05, and you don't have to deal with using that ****ty move() command where if you change your direction during the middle of the movement, it jumps around. You just do movement like normal, and set a certain attr to a certain value. Easy.

salesman

01-06-2011 04:01 AM

Quote:

Originally Posted by fowlplay4 (Post 1620621)

What's the reasoning for adding pi/2, getangle a fraud?

because thickness is perpendicular to the angle of the line

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