sketch/triangle/triangle.pde

int numFrames = 100;
int m = 1000;

void setup(){
  size(500,500,P3D);

  stroke(255);
  fill(255);
}

class Tri{
  float x1,y1,x2,y2,x3,y3;
  float theta;
}

float x1(float t){
  return 0.50*width + 50*cos(TWO_PI*t);
}
float y1(float t){
  return 0.5*height + 50*sin(TWO_PI*t);
}

float x2(float t){
  return 0.50*width + 20*cos(2*TWO_PI*t);
}
float y2(float t){
  return 0.5*height + 20*sin(2*TWO_PI*t);
}
float x3(float t) {
  return 0.5*width + 120 * cos(2*TWO_PI*t);
}
float y3 (float t) {
  return 0.5*height + 120 * cos(TWO_PI*t);
}

void push() {
  pushMatrix();
  pushStyle();
}

void pop() {
  popStyle();
  popMatrix();
}

int parts = 8;
int n = 20;

void drawTri(int j) {
  
  float t = 1.0*(frameCount-1)/numFrames;

    pushStyle();
    strokeWeight(2);
    stroke(255,100);
    for(int i=0;i<=m;i++){
      float tt = 1.0*i/m;

      float x = lerp(x1(t),x2(t),tt);
      float x2 = lerp(x2(t),x3(t),tt);
      float x3 = lerp(x3(t),x1(t),tt);
      float y = lerp(y1(t),y2(t),tt);
      float y2 = lerp(y2(t),y3(t),tt);
      float y3 = lerp(y3(t),y1(t),tt);

      point(x,y);
      point(x2,y2);
      point(x3,y3);
    }
    popStyle();
}

void draw(){
  float t = 1.0*(frameCount - 1)/numFrames;

  background(0);

   // triangle(x1(t), y1(t), x2(t), y2(t), x3(t), y3(t));

    push();
  translate(width/4,height/6);
  
  for(int i=0;i<n;i++){
    push();
    rotate(i*TWO_PI/n);
    drawTri(i);
    pop();
  }
  
  pop();

  if (frameCount<=numFrames){
    saveFrame("fr###.png");
  }
}