double angDiff = Angle.angleBetweenOriented(seg0.p0, basePt, seg1.p1);
/** * 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 */ public static AffineTransformation createFromControlVectors(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; }
double ang = Angle.angleBetweenOriented(src1, src0, rotPt);