From caef1259af1c843232dfbf5efc65adcf83d67f6f Mon Sep 17 00:00:00 2001
From: Hans Hagen <pragma@wxs.nl>
Date: Thu, 25 Mar 2021 14:12:41 +0100
Subject: 2021-03-25 14:03:00

---
 metapost/context/base/mpxl/mp-mlib.mpxl | 72 +++++++++++++++++++++++++++++++--
 1 file changed, 68 insertions(+), 4 deletions(-)

(limited to 'metapost')

diff --git a/metapost/context/base/mpxl/mp-mlib.mpxl b/metapost/context/base/mpxl/mp-mlib.mpxl
index 40be3dd2d..ed3f79be5 100644
--- a/metapost/context/base/mpxl/mp-mlib.mpxl
+++ b/metapost/context/base/mpxl/mp-mlib.mpxl
@@ -123,12 +123,12 @@ def withtransparency(expr a, t) =
     withprescript "tr_transparency=" & decimal t
 enddef ;
 
-% works reverse from transparency (for svg)
+% for svg:
 
 def withopacity expr o =
     if o <> 1 :
         withprescript "tr_alternative="  & decimal normaltransparent
-        withprescript "tr_transparency=" & decimal (1 - o)
+        withprescript "tr_transparency=" & decimal o
     fi
 enddef ;
 
@@ -1126,6 +1126,11 @@ def figure primary filename =
     rawtextext("\externalfigure[" & filename & "]")
 enddef ;
 
+vardef svgembeddedfigure primary index =
+%     mfun_onetime_textext := true ;
+    rawtextext("\svgembeddedfigure{" & decimal index & "}")
+enddef ;
+
 permanent withmask, externalfigure, figure ;
 
 % Positions
@@ -1425,16 +1430,75 @@ primarydef t asgroup s = % s = isolated|knockout
     temp_q:= nullpicture ;
     addto temp_q contour temp_r
         withprescript "gr_state=start"
-        withprescript "gr_type=" & s ;
+        withprescript "gr_type=" & s
+    ;
     addto temp_q also temp_p ;
     addto temp_q contour temp_r
-        withprescript "gr_state=stop" ;
+        withprescript "gr_state=stop"
+    ;
     temp_q
     endgroup
 enddef ;
 
 permanent asgroup ;
 
+% Even more experimental:
+
+pair    mfun_pattern_s ; mfun_pattern_s := origin ; % auto scale to fraction of shape (svg)
+boolean mfun_pattern_f ; mfun_pattern_f := false  ; % anchor or not (normally we do that)
+
+def withpatternscale primary s = hide (mfun_pattern_s := s ;) enddef ;
+def withpatternfloat primary s = hide (mfun_pattern_f := s ;) enddef ;
+
+primarydef t withpattern p =
+    begingroup
+    %
+    save temp_q, temp_r ;
+    picture temp_q ; path temp_r ;
+    % the combination
+    temp_q:= nullpicture ;
+    % the pattern
+    temp_r := boundingbox p ;
+    if mfun_pattern_s <> origin :
+        sx := (xpart mfun_pattern_s) * bbwidth (t) ;
+        sy := (ypart mfun_pattern_s) * bbheight(t) ;
+        temp_r := temp_r xysized (sx,sy) ;
+        addto temp_q contour temp_r
+            withprescript "pt_state=start"
+            withprescript "pt_action=set"
+            withprescript "pt_float=" & tostring(mfun_pattern_f)
+        ;
+        addto temp_q also (p xysized (sx,sy));
+    else :
+        addto temp_q contour temp_r
+            withprescript "pt_state=start"
+            withprescript "pt_action=set"
+            withprescript "pt_float=" & tostring(mfun_pattern_f)
+        ;
+        addto temp_q also p ;
+    fi ;
+    addto temp_q contour temp_r
+        withprescript "pt_state=stop"
+        withprescript "pt_action=set" ;
+    % the path
+    temp_r := boundingbox t ;
+    addto temp_q contour temp_r
+        withprescript "pt_state=start"
+        withprescript "pt_action=get"
+    ;
+    addto temp_q contour temp_r
+        withprescript "pt_state=stop"
+        withprescript "pt_action=get" ;
+    % make sure we fill only t
+    clip temp_q to t ;
+    % reset
+    mfun_pattern_s := origin ;
+    mfun_pattern_f := false ;
+    % the path
+    temp_q
+    endgroup
+enddef ;
+
 % Also experimental ... needs to be made better ... so it can change!
 
 string mfun_auto_align[] ;
-- 
cgit v1.2.3