curveVertex through PVector position

alless0

hi , I just wanted to make a curveVertex through the path of my PVector which is moving . here's the code : ( I just dont know how to give Location of PVector in a frame before current frame)

PVector loc;
PVector vel;
PVector acc;



void setup(){
  size(1280,720);
  smooth();
  loc = new PVector (width/2,height/2);
  vel = new PVector (0,0);
  acc = new PVector (.01,0);

}


void draw(){

  acc = PVector.random2D();
  vel.add(acc);
  loc.add(vel);
  acc.limit(1);
  noFill();

  beginShape();
  curveVertex(loc.x,loc.y);
  ////////////////////////
  endShape();

}

LevinAnderson

Hi,

For draw a curveVertex, you need at least 4 vertices. The first and last aren't drawn, they use for compute the tangent on the second and (n-1) vertices. For that you need memorised the old position. For exemple

PVector loc, loc_old;
PVector vel;
PVector acc;



void setup(){
  size(1280,720);
  smooth();
  loc = new PVector (width/2,height/2);
  loc_old = loc.get();
  vel = new PVector (0,0);
  acc = new PVector (.01,0);

}


void draw(){

  acc = PVector.random2D();
  vel.add(acc);
  loc.add(vel);
  acc.limit(1);
  noFill();

  beginShape();
  curveVertex(loc_old.x,loc_old.y);
  curveVertex(loc_old.x,loc_old.y);
  curveVertex(loc.x,loc.y);
  curveVertex(loc.x,loc.y);
  endShape();

  loc_old=loc.get();
}

But the curve can go out of window...

alless0

Yea I got it ! thanx man !

also wrote this to check for edges :

  void checkEdges() {

    if (loc.x > width) {
      loc.x = 0;
        loc_old=loc.get();
    } 
    else if (loc.x < 0) {
      loc.x = width;
        loc_old=loc.get();
    }

    if (loc.y > height) {
      loc.y = 0;
        loc_old=loc.get();
    } 
    else if (loc.y < 0) {
      loc.y = height;
        loc_old=loc.get();
    }
  }