life like noise movement?

Programming Questions

rich_brig..

in Programming Questions • 1 year ago

Hey guys.

Have posted about this before but realised i was pretty vague! im basically trying to make a circle move in a life like way around its location, but never stray to far from.

just like in this example -

http://saveas.hostoi.com/bezierlove.html

Code below is as far as i got working from one of the noise examples. The problem is -

1. cant see how to stop the circle just moving diagonally

2. The movement is way too fast

3. Dont completely get how noise works, and therefore why the circle starts down and to the right of the mouse.

thanks in advance!

rich

float xoff = 0.0;

void setup() {

size(400, 400);

}

void draw()

{

background(204);

xoff = xoff + .01;

float n = noise(xoff) * width;

ellipse((mouseX + n ), n, 30, 30);

}

Replies(3)

amnon.owed

Re: life like noise movement?

1 year ago

Noise returns a semi-random value between 0 and 1. Processing can compute 1D, 2D and 3D noise. The noise value can be animated by moving through the noise space.

Code Example

void setup() {
size(500, 500);
smooth();
noStroke();
fill(0);
}
void draw() {
background(255);
// an x and y value are calculated seperately
// the noise part return a value between 0 and 1 and is thus multiplied by the dimensions
// frameCount increases by 1 each frame, thus 'animates' the noise value
// since these steps will be too big (thus fast), frameCount is divided by 100
// to prevent synchronous xy-movement (a diagonal line) we want different noise values for x and y
// to do this we add an arbitrary number, in this case 1, to the input value for the y noise
float x = noise(frameCount*0.01)*width;
float y = noise(1+frameCount*0.01)*height;
ellipse(x, y, 50, 50);
}

On a sidenote, check out this example:
File > Examples > Books > Processing Handbook > Units 31-42 > 32 Motion 2 > _07

rich_brig..

Re: Re: life like noise movement?

1 year ago

thanks a lot amnon. your example makes it very clear, i feel like it should be in the processing help file. Been able to do exactly what i wanted now. However didnt really get the relevance of the handbook example, think u may have meant _08 or _09?

cheers

Rich

amnon.owed

Re: life like noise movement?

1 year ago

The handbook example wasn't related to the noise quesion, but I thought it looked a bit like (a basic version of) the bezierlove example you linked to earlier. So it was really a side-side-sidenote.

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