Processing 1.0 - Processing Discourse - pf Particle Type not found & whatz a P3D ?

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pf Particle Type not found & whatz a P3D ? (Read 865 times)

jshupert

pf Particle Type not found & whatz a P3D ?
Dec 23^rd, 2005, 7:49pm

I am attempting to learn more...
sometimes I run into something that I just cannot see...
like I tried to run a prog and got this error

Error: Type "Particle" was not found.

so how can particle not be found ? Is it a Library?
and also why is "P3D" entered after declaring the "stage size"

such as size(640, 480, P3D);

//the whole code is
//
Particle[] ptcls;
int n_ptcls;
int h = 0;

void setup()
{
size(640, 480, P3D);
background(random(255), random(255), random(255));
noStroke();
n_ptcls = 50 + (int)random(150);
ptcls = new Particle[n_ptcls];
if(random(1) > 0.5)
{
h = (int)(25 + random(220));
}
else
{
h = 0;
}

for(int i = 0; i < n_ptcls; i++)
{
ptcls[i] = new Particle(random(width), random(height), 5 + random(10), h);
}
}

void draw()
{
for(int i = 0; i < n_ptcls; i++)
{
if(i == 0)
{
//ptcls[i].Interact(mouseX, mouseY);
ptcls[i].Interact(ptcls[n_ptcls-1].x, ptcls[n_ptcls-1].y);
}
else
{
ptcls[i].Interact(ptcls[i-1].x, ptcls[i-1].y);
for(int j = 0; j < n_ptcls; j++)
{
int k = 0;
float vx = 0;
float vy = 0;
if(i != j)
{
float dx = ptcls[i].x - ptcls[j].x;
float dy = ptcls[i].y - ptcls[j].y;
float d = sqrt(dx*dx + dy*dy);
if(d < ptcls[i].r * 2)
{
vx += ptcls[j].vx;
vy += ptcls[j].vy;
k++;
if(d < ptcls[i].r)
{
ptcls[i].x += dx * 0.02;
ptcls[i].y += dy * 0.02;
ptcls[j].x += -dx * 0.02;
ptcls[j].y += -dy * 0.02;
}
}
if(k != 0)
{
ptcls[i].vx += vx / (float)k * 0.05;
ptcls[i].vy += vy / (float)k * 0.05;
ptcls[i].vx *= 0.99;
ptcls[i].vy *= 0.99;
}
}
}
}

ptcls[i].Render();
}
}

...........................

Thnaks lots....

right now ... as yoy can tell, I am not much of a coder ..
but I do enjoy it...

mostly I try to take apart and understand other folks wonderful efforts

thanks!

seltar

Re: pf Particle Type not found & whatz a P3D ?
Reply #1 - Dec 27^th, 2005, 2:07pm

P3D is used when you need to use a 3d coordinate system.
In this case it would be quite enough without P3D, and you have functions like smooth and strokeweight available when you don't use it..

You don't seem to have the class called Particle in your code.. you'll either have to find the one you got the idea from, or write your own..
something like
Code:


class Particle
{
 float x,y;
 float vx,vy;
 Particle(float x, float y, float vx, float vy)
 {
  this.x = x;
  this.y = y;
  this.vx = vx;
  this.vy = vy;
 }

 void Interact(somethingsomething)
 {
  do stuff here
 }
}

regards

-seltar

I'm bored, therefore I program
http://seltar.org > seltar's special place
http://snippet.seltar.org > seltar's snippet palace
http://libraries.seltar.org > seltar's libraries

fry

Re: pf Particle Type not found & whatz a P3D ?
Reply #2 - Dec 29^th, 2005, 4:00pm

regarding the P3D thing.. this is where "find in reference" becomes useful. since it's used in the size() command, select the word "size", right-click and select "find in reference" from the menu, which will turn up more background on P3D.

as for the Particle class, that depends on where you got the code.. it's another file (or set of files) that you're missing.

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