*** empty log message ***

[lilypond.git] / scm / stencil.scm

diff --git a/scm/stencil.scm b/scm/stencil.scm
index 27c99be363e346c9011a4287e34040a9cd9da4fd..81e1d9a40c28253fcd3d5b5d0b88774340f02480 100644 (file)
--- a/scm/stencil.scm
+++ b/scm/stencil.scm
@@ -2,7 +2,7 @@
 ;;;;
 ;;;;  source file of the GNU LilyPond music typesetter
 ;;;; 
-;;;; (c)  2003--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+;;;; (c) 2003--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 
 (define-public (stack-stencils axis dir padding stils)
   "Stack stencils STILS in direction AXIS, DIR, using PADDING."
@@ -13,6 +13,19 @@
          (car stils) axis dir (stack-stencils axis dir padding (cdr stils))
          padding))))
 
+(define-public (stack-stencils-padding-list axis dir padding stils)
+  "Stack stencils STILS in direction AXIS, DIR, using a list of PADDING."
+  (cond
+   ((null? stils) empty-stencil)
+   ((null? (cdr stils)) (car stils))
+   (else (ly:stencil-combine-at-edge
+         (car stils) axis dir (stack-stencils-padding-list axis dir (cdr padding) (cdr stils))
+         (car padding)))))
+
+(define-public (centered-stencil stencil)
+  "Center stencil @var{stencil} in both the X and Y directions"
+  (ly:stencil-aligned-to (ly:stencil-aligned-to stencil X CENTER) Y CENTER))
+
 (define-public (stack-lines dir padding baseline stils)
   "Stack vertically with a baseline-skip."
   (if (null? stils)
@@ -44,6 +57,13 @@
                        (- (car yext)) (cdr yext))
       xext yext))
 
+(define-public (make-circle-stencil radius thickness fill)
+  "Make a circle of radius @var{radius} and thickness @var{thickness}"
+  (ly:make-stencil
+   (list 'circle radius thickness fill) 
+   (cons (- radius) radius)
+   (cons (- radius) radius)))
+
 (define-public (box-grob-stencil grob)
   "Make a box of exactly the extents of the grob.  The box precisely
 encloses the contents.
@@ -54,25 +74,33 @@ encloses the contents.
     
     (ly:stencil-add
      (make-filled-box-stencil xext (cons (- (car yext) thick) (car yext)))
-     (make-filled-box-stencil xext (cons  (cdr yext) (+ (cdr yext) thick)))
+     (make-filled-box-stencil xext (cons (cdr yext) (+ (cdr yext) thick)))
      (make-filled-box-stencil (cons (cdr xext) (+ (cdr xext) thick)) yext)
      (make-filled-box-stencil (cons (- (car xext) thick) (car xext)) yext))))
 
 ;; TODO merge this and prev function. 
-(define-public (box-stencil stil thick padding)
-  "Add a box around STIL, producing a new stencil."
-  (let* ((x-ext (interval-widen (ly:stencil-extent stil 0) padding))
-        (y-ext (interval-widen (ly:stencil-extent stil 1) padding))
-        (y-rule (make-filled-box-stencil (cons 0 thick) y-ext))
-        (x-rule (make-filled-box-stencil (interval-widen x-ext thick)
-                                          (cons 0 thick))))
-    
-    (set! stil (ly:stencil-combine-at-edge stil X 1 y-rule padding))
-    (set! stil (ly:stencil-combine-at-edge stil X -1 y-rule padding))
-    (set! stil (ly:stencil-combine-at-edge stil Y 1 x-rule 0.0))  
-    (set! stil (ly:stencil-combine-at-edge stil Y -1 x-rule 0.0))
-    
-    stil))
+(define-public (box-stencil stencil thickness padding)
+  "Add a box around STENCIL, producing a new stencil."
+  (let* ((x-ext (interval-widen (ly:stencil-extent stencil 0) padding))
+        (y-ext (interval-widen (ly:stencil-extent stencil 1) padding))
+        (y-rule (make-filled-box-stencil (cons 0 thickness) y-ext))
+        (x-rule (make-filled-box-stencil
+                 (interval-widen x-ext thickness) (cons 0 thickness))))
+    (set! stencil (ly:stencil-combine-at-edge stencil X 1 y-rule padding))
+    (set! stencil (ly:stencil-combine-at-edge stencil X -1 y-rule padding))
+    (set! stencil (ly:stencil-combine-at-edge stencil Y 1 x-rule 0.0))  
+    (set! stencil (ly:stencil-combine-at-edge stencil Y -1 x-rule 0.0))
+    stencil))
+
+(define-public (circle-stencil stencil thickness padding)
+  "Add a circle around STENCIL, producing a new stencil."
+  (let* ((x-ext (ly:stencil-extent stencil 0))
+        (y-ext (ly:stencil-extent stencil 1))
+        (diameter (max (- (cdr x-ext) (car x-ext))
+                       (- (cdr y-ext) (car y-ext))))
+        (radius (+ (/ diameter 2) padding thickness)))
+    (ly:stencil-add
+     (centered-stencil stencil) (make-circle-stencil radius thickness #f))))
 
 (define-public (fontify-text font-metric text)
   "Set TEXT with font FONT-METRIC, returning a stencil."