Processing 1.0 - Processing Discourse - growing random direction line

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Index › Programming Questions & Help › Syntax Questions › growing random direction line

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growing random direction line (Read 602 times)

brt

growing random direction line
Jun 5^th, 2009, 2:14pm

hey, im trying to do some growing lines that go in random directions and i began trying to do one .

so i thought i would programme a float that would be a noise and then increment it with 0.01 and put something like:
float x2 = initial x value;
float y2 = initial y value;
float x = noise();
float y = noise();
x += incrementFloat;
y += incrementFloat;
line(x2,y2,x,y);

and this didn't work.... can someone tell me why?
but here is my code a little more complete....
line(
Code:



float xplus = 0.01;
float yplus = 0.01;

float xx = random(0, 0.05);
float yy = random(0, 10);




void setup(){
 size(595,842);

 smooth();

 frameRate(60);
}

void draw(){

 float x = noise(xx)*width;
 float y = noise(yy)*height;
 float r = random(100,200);
 float g = random(100,200);
 float b = random(100,200);
 float a = random(100,200);


 xx += xplus;
 yy += yplus;
 
 




float clr1 = random(255);
float clr2 = random(height);
  float siZe = random(40);
  float xp = noise(20,40);
   fill(0,0,clr1,clr1);

line(x,y,y,x);
  

  }

Cedric

Re: growing random direction line
Reply #1 - Jun 5^th, 2009, 6:55pm

Im mot sure if i really understood what you are trying to do, maybe explain how it should behave, look etc.

but thats what i quickly did.

float x1 = 300;
float y1 = 400;

void setup(){
size(595,842);
smooth();
}

void draw(){
float x2 = x1 + random(-10,10);
float y2 = y1 + random(-10,10);

line(x1,y1,x2,y2);

x1 = x2;
y1 = y2;
}

its more or less brownian Motion i would say

twitter.com/CedricKiefer

brt

Re: growing random direction line
Reply #2 - Jun 6^th, 2009, 7:07am

well, that's really cool but not quite that! what i want is actually preety normal to see.... its probably how you would do something like http://www.flickr.com/photos/autologous/3572082288/in/pool-generatorx

or
http://www.flickr.com/photos/autologous/3590221929/in/pool-generatorx besides the fact that in these examples there are a lot of lines and i only want one!

Mascimo

Re: growing random direction line
Reply #3 - Jun 7^th, 2009, 9:53pm

I am working on something kinda like that.

Here is my version:

Code:


float x; // the current position
float y;

float px; // "previous" position
float py;

float vel; 
float dir; 
// here you declare the speed as a pair of
// direction and absolute speeed, instead of
// declaring each component on x and y axises
// that way you have better control over the
// direction of movement.


void setup(){
  size(400,400);
  stroke(0);
  background(255);
  smooth();
  frameRate(30);

  x=y=px=py=200;
  // at first the previous position is equal
  // to the current

  vel = random(5);  
  dir = random(360);
  // the direction is given in degrees
}

void draw(){
  px = x;
  py = y;
  x+= cos(radians(dir))*vel;
  y+= sin(radians(dir))*vel;
  //this is trigonometry to convert the
  //speed into x and y components

  stroke(0);
  line(px,py,x,y);

  dir+=random(-30,30);

}

brt Full Member Offline Posts: 101	Re: growing random direction line Reply #4 - Jun 8^th, 2009, 4:23am thanks so much man!

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