Small Question about code that rotates a "shape"

TheApexTheater

I'm trying to make rotating polygon on processing, but I'm having a bit of trouble... The way the project will eventually work is that there will be an n-sided polygon, made out of lines, and the polygon rotates 360°. Right now, I'm just interested in having a single line be able to make a full rotation and change its angle as its rotating.

The line in the project works as intended (sort of), but I can't seem to increase the size of it without drastically increasing the speed

http://www.openprocessing.org/sketch/376656

Any and all help is appreciated!

bontempos

could it be any solution for you?

class movableLine{
  float vx, vy;
  float lineLen;
  float x1, y1;

  float angle, angleConst;
  movableLine(float x1, float y1, float lineLen, float angle)
  {
    this.x1 = x1;
    this.y1 = y1;
    this.lineLen = lineLen;
    this.angle = angle;
    this.angleConst = angle;
  }

  void display()
  {
    pushMatrix();
    translate(x1,y1);
    rotate(angle);
    line(-lineLen/2,0,lineLen/2,0);
    popMatrix();
  }

  void changeSpeeds()
  {
    vx = 10* cos(angle);
    vy = 10 * sin(angle);
    angle += angleConst;
  }

  void move()
  {
    x1 += vx;
    y1 += vy;
  } 
}

void setup()
{
  size(500, 500);
  background(255, 255, 255);
  color(0, 0, 0);
}

movableLine oneLine = new movableLine(0., 0., 50, PI/32);
void draw()
{
  background(255, 255,255  );
  translate(width/2, height/2);
  oneLine.move();
  oneLine.display();
  oneLine.changeSpeeds();

}

TheApexTheater

This works incredibly well! Thank you very much!

If you don't mind me asking... Why'd you change the display() method to have a push/popMatrix()? I'm having trouble understanding the translate(x1, y1) part, as well well as changing the move() method to only affect x1 and y1?

Again, thank you very much for solving my question