Fix some bugs in the dynamic engraver and PostScript backend

[lilypond.git] / lily / stencil.cc

diff --git a/lily/stencil.cc b/lily/stencil.cc
index a9693e7a7ce71fb8c1dd0028d4310800c95c1a2a..dd3bb2626ea93f5559672a062c1a6769dc3726f0 100644 (file)
--- a/lily/stencil.cc
+++ b/lily/stencil.cc
@@ -8,8 +8,7 @@
 
 #include "stencil.hh"
 
-
-#include "dimensions.hh"
+#include "main.hh"
 #include "font-metric.hh"
 #include "input-smob.hh"
 #include "string-convert.hh"
@@ -79,6 +78,44 @@ Stencil::origin () const
   return origin_;
 }
 
+/*
+ * Rotate this stencil around the point [x, y]
+ */
+void
+Stencil::rotate (Real a, Offset 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 + off[X_AXIS] * x_cen;
+  const Real y = y_cen + off[Y_AXIS] * y_cen;
+
+  /*
+   * Build scheme expression (processed in stencil-interpret.cc)
+   */
+  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))),
+                     expr_, SCM_UNDEFINED);
+
+  /*
+   * Calculate the new bounding box
+   */
+  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));
+
+  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));
+}
+
 void
 Stencil::translate (Offset o)
 {
@@ -95,6 +132,8 @@ Stencil::translate (Offset o)
                             + "\n"
                             + "Setting to zero.");
          o[a] = 0.0;
+         if (strict_infinity_checking)
+           scm_misc_error (__FUNCTION__, "Improbable offset.", SCM_EOL);
        }
       incr (a);
     }