Method getShape

src/org/opensourcephysics/media/core/TVector.java:240–276

Gets the shape to be filled in the draw method. @param vidPanel the video panel @return the line shape

(VideoPanel vidPanel)

   * @return the line shape
   */
  @Override
protected Shape getShape(VideoPanel vidPanel) {
    this.center(tip, tail);
    Point p1 = tail.getScreenPosition(vidPanel); // tail
    Point p2 = tip.getScreenPosition(vidPanel);  // tip
    // set up transform
    double theta = Math.atan2(p2.y-p1.y, p2.x-p1.x);
    rotation.setToRotation(theta, p1.x, p1.y);
    rotation.translate(p1.x, p1.y);
    // get line length d
    float d = (float) p1.distance(p2);
    // set up head hit shape usng full line length
    path.reset();
    path.moveTo(d-4, 0);
    path.lineTo(d-6, -2);
    path.lineTo(d, 0);
    path.lineTo(d-6, 2);
    path.closePath();
    head = rotation.createTransformedShape(path);
    // shorten line length to account for stroke width
    // see Java 2D API Graphics, by VJ Hardy (Sun, 2000) page 147
    float w = stroke.getLineWidth();
    d = d-1.58f*w;
    // set up shaft hit shape using shortened line length
    line.setLine(0, 0, d-length, 0);
    shaft = rotation.createTransformedShape(line);
    // set up and return fill shape usng shortened line length
    path.reset();
    path.moveTo(0, 0);
    path.lineTo(d-length+width, 0);
    path.lineTo(d-length, -width);
    path.lineTo(d, 0);
    path.lineTo(d-length, width);
    path.lineTo(d-length+width, 0);
    Shape vector = rotation.createTransformedShape(path);
    return stroke.createStrokedShape(vector);
  }

  //_________________________ inner End classes _________________________
  class LineEnd extends TPoint {