Processing 1.0 - Processing Discourse - creating circle line increasing & decreasing

We closed this forum 18 June 2010. It has served us well since 2005 as the ALPHA forum did before it from 2002 to 2005. New discussions are ongoing at the new URL http://forum.processing.org. You'll need to sign up and get a new user account. We're sorry about that inconvenience, but we think it's better in the long run. The content on this forum will remain online.

Index › Programming Questions & Help › Syntax Questions › creating circle line increasing & decreasing

‹ Previous Topic | Next Topic ›

Pages: 1

creating circle line increasing & decreasing (Read 594 times)

stephanie

creating circle line increasing & decreasing
Jul 11^th, 2008, 11:04am

hi,
i want to create a circle line which is increasing & decreasing softly in size (each single circle), so that it looks like a symetrical wave form.
for creating the circle line i start very simple:

float x;
float x=x+10;
void draw (){
ellipse (x,20, 5,5)
}

now to slightly increase the size of the ellipse (5) and decrease it at a certain value again, i might use some sin function...?

who can help?
thanks!

PhiLho

Re: creating circle line increasing & decreasi
Reply #1 - Jul 11^th, 2008, 1:34pm

Simple starting point:

int radius1 = 5;
int rMove1 = +1;
int minRadius1 = 5, maxRadius1 = 100;
int xPos1 = 100;
int yPos1 = 200;

int radius2 = 5;
float rMove2 = 0;
int minRadius2 = 20, maxRadius2 = 140;
int xPos2 = 300;
int yPos2 = 200;

void setup()
{
size(400, 400);
// frameRate(10);
}

void draw()
{
background(240);
noFill();

// Linear
ellipse(xPos1, yPos1, radius1, radius1);
radius1 += rMove1;
if (radius1 > maxRadius1)
rMove1 = -1;
else if (radius1 < minRadius1)
rMove1 = +1;

// Sinus
ellipse(xPos2, yPos2, radius2, radius2);
rMove2 += 0.02;
radius2 = (int) ((maxRadius2 - minRadius2) * sin(rMove2) + minRadius2);
}

stephanie YaBB Newbies Offline Posts: 5	Re: creating circle line increasing & decreasi Reply #2 - Jul 11^th, 2008, 5:04pm thank you so much for this two versions of motion! ..i'll try to get it in my sketch. maybe i have another question tomorrow.

stephanie YaBB Newbies Offline Posts: 5	Re: creating circle line increasing & decreasi Reply #3 - Jul 11^th, 2008, 5:12pm it works! thank you!

Pages: 1

‹ Previous Topic | Next Topic ›