createFromControlVectors2 static method

AffineTransformation? createFromControlVectors2(Coordinate src0, Coordinate src1, Coordinate dest0, Coordinate dest1,)

• Creates an AffineTransformation defined by a pair of control vectors. A
  • control vector consists of a source point and a destination point, which is
    • the image of the source point under the desired transformation. The
    • computed transformation is a combination of one or more of a uniform scale,
    • a rotation, and a translation (i.e. there is no shear component and no
    • reflection)
    • @param src0
    • @param src1
    • @param dest0
    • @param dest1
    • @return the computed transformation, or null if the control vectors do not determine a well-defined transformation

Implementation

static AffineTransformation? createFromControlVectors2(
    Coordinate src0, Coordinate src1, Coordinate dest0, Coordinate dest1) {
  Coordinate rotPt = new Coordinate(dest1.x - dest0.x, dest1.y - dest0.y);

  double ang = Angle.angleBetweenOriented(src1, src0, rotPt);

  double srcDist = src1.distance(src0);
  double destDist = dest1.distance(dest0);

  if (srcDist == 0.0) return null;

  double scale = destDist / srcDist;

  AffineTransformation trans =
      AffineTransformation.translationInstance(-src0.x, -src0.y);
  trans.rotate(ang);
  trans.scale(scale, scale);
  trans.translate(dest0.x, dest0.y);
  return trans;
}