GearDemo

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class Gear {

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  ArrayList<Vec2D> array = new ArrayList<Vec2D>();

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  float radius;

  Vec2D center = new Vec2D();

  float teethHeight = 10;

  float teeth_factor = 2;

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  int numberOfTeeh = 0;

  float teethAngle;

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  Gear(float radius) {

    this.radius = setRadius(radius);

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    buildGear();

  }

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  void buildGear() {

    numberOfTeeh = 0;

    teethAngle = 0;

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    array = new ArrayList<Vec2D>();

    ArrayList<Vec2D> circle = createArc(center, radius);

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    Vec2D p1 = circle.get(0);

    Vec2D p0;

    for (int i=1; i<circle.size(); i++) {

      p0 = circle.get(i);

      teeth(p1, p0);

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      p1=p0;

    }

    array.add(array.get(0));

  }

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  void teeth(Vec2D p1, Vec2D p0) {

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    if (p1.equalsWithTolerance(p0, 0.01f)) {

      return;

    }

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    this.numberOfTeeh++;

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    Vec2D p4;

    Vec2D p3;

    p3 = p0.add(p1).scale(0.5f);

    Line2D l = new Line2D(center, p3);

    p4 = new Ray2D(p3, l.getDirection()).getPointAtDistance(teethHeight);

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    array.add(p1);

    array.add(p4);

  }

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  ArrayList<Vec2D> createArc(Vec2D center, float radius) {

    ArrayList<Vec2D> points = new ArrayList<Vec2D>();

    float theta = 0;

    float delta = PApplet.TWO_PI/(radius*(1f/teeth_factor));

    teethAngle = delta;

    for (; theta<PApplet.TWO_PI; theta+=delta) {

      Vec2D p=new Vec2D(radius, theta).toCartesian().addSelf(center);

      points.add(p);

    }

    points.add(new Vec2D(radius, PApplet.TWO_PI).toCartesian().addSelf(center));

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    return points;

  }

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  float setRadius(float _radius) {

    radius = _radius - _radius%teeth_factor;

    buildGear();

    return radius;

  }

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  ArrayList<Vec2D> getPoints() {

    return array;

  }

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  float getRadius() {

    return radius;

  }

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  Vec2D getCenter() {

    return center;

  }

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  void setCenter(Vec2D center) {

    this.center = center;

    this.buildGear();

  }

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  float getTeethHeight() {

    return this.teethHeight;

  }

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  float getTeethNumber() {

    return numberOfTeeh;

  }

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  float getTeethAngle() {

    return teethAngle;

  }

}

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