LY_DEFINE (ly_stencil_rotate, "ly:stencil-rotate",
4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y),
"Return a stencil @var{stil} rotated @var{angle} degrees around"
- " point (@var{x}, @var{y}).")
+ " the relative offset (@var{x}, @var{y}). E.g. an offset of"
+ " (-1, 1) will rotate the stencil around the left upper corner.")
{
Stencil *s = unsmob_stencil (stil);
LY_ASSERT_SMOB (Stencil, stil, 1);
return new_s;
}
+LY_DEFINE (ly_stencil_rotate_absolute, "ly:stencil-rotate-absolute",
+ 4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y),
+ "Return a stencil @var{stil} rotated @var{angle} degrees around"
+ " point (@var{x}, @var{y}), given in absolute coordinates.")
+{
+ Stencil *s = unsmob_stencil (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ LY_ASSERT_TYPE (scm_is_number, angle, 2);
+ LY_ASSERT_TYPE (scm_is_number, x, 3);
+ LY_ASSERT_TYPE (scm_is_number, y, 4);
+ Real a = scm_to_double (angle);
+ Real x_off = scm_to_double (x);
+ Real y_off = scm_to_double (y);
+
+ SCM new_s = s->smobbed_copy ();
+ Stencil *q = unsmob_stencil (new_s);
+ q->rotate_degrees_absolute (a, Offset (x_off, y_off));
+ return new_s;
+}
+
LY_DEFINE (ly_round_filled_box, "ly:round-filled-box",
3, 0, 0,
(SCM xext, SCM yext, SCM blot),
}
/*
- Rotate this stencil around the point RELATIVE_OFF.
+ Rotate this stencil around the point ABSOLUTE_OFF.
- RELATIVE_OFF is measured in terms of the extent of the stencil, so
- -1 = LEFT/DOWN edge, 1 = RIGHT/UP edge.
*/
void
-Stencil::rotate_degrees (Real a, Offset relative_off)
+Stencil::rotate_degrees_absolute (Real a, Offset absolute_off)
{
- const Real x_cen = extent (X_AXIS).center ();
- const Real y_cen = extent (Y_AXIS).center ();
-
- /*
- * Calculate the center of rotation
- */
- const Real x = x_cen + relative_off[X_AXIS] * x_cen;
- const Real y = y_cen + relative_off[Y_AXIS] * y_cen;
+ const Real x = absolute_off[X_AXIS];
+ const Real y = absolute_off[Y_AXIS];
/*
* Build scheme expression (processed in stencil-interpret.cc)
*/
+ /* TODO: by hanwenn 2008/09/10 14:38:56:
+ * in effect, this copies the underlying expression. It might be a
+ * little bit nicer to mirror this in the api, ie. make a
+ * Stencil::rotated()
+ * and have Stencil::rotate be an abbrev of
+ * *this = rotated()
+ */
+
expr_ = scm_list_n (ly_symbol2scm ("rotate-stencil"),
scm_list_2 (scm_from_double (a),
scm_cons (scm_from_double (x), scm_from_double (y))),
/*
* Calculate the new bounding box
*/
+ Box shifted_box = extent_box ();
+ shifted_box.translate (-absolute_off);
+
vector<Offset> pts;
- pts.push_back (Offset (-x_cen, -y_cen));
- pts.push_back (Offset (x_cen, -y_cen));
- pts.push_back (Offset (x_cen, y_cen));
- pts.push_back (Offset (-x_cen, y_cen));
+ pts.push_back (Offset (shifted_box.x ().at(LEFT), shifted_box.y ().at(DOWN)));
+ pts.push_back (Offset (shifted_box.x ().at(RIGHT), shifted_box.y ().at(DOWN)));
+ pts.push_back (Offset (shifted_box.x ().at(RIGHT), shifted_box.y ().at(UP)));
+ pts.push_back (Offset (shifted_box.x ().at(LEFT), shifted_box.y ().at(UP)));
const Offset rot = complex_exp (Offset (0, a * M_PI / 180.0));
dim_.set_empty ();
for (vsize i = 0; i < pts.size (); i++)
- dim_.add_point (pts[i] * rot + Offset (x_cen, y_cen));
+ dim_.add_point (pts[i] * rot + absolute_off);
+}
+
+/*
+ Rotate this stencil around the point RELATIVE_OFF.
+
+ RELATIVE_OFF is measured in terms of the extent of the stencil, so
+ -1 = LEFT/DOWN edge, 1 = RIGHT/UP edge.
+ */
+void
+Stencil::rotate_degrees (Real a, Offset relative_off)
+{
+ /*
+ * Calculate the center of rotation
+ */
+ const Real x = extent (X_AXIS).linear_combination (relative_off[X_AXIS]);
+ const Real y = extent (Y_AXIS).linear_combination (relative_off[Y_AXIS]);
+ rotate_degrees_absolute (a, Offset (x, y));
}
void