X-Git-Url: https://git.stderr.nl/gitweb?p=matthijs%2Fmaster-project%2Freport.git;a=blobdiff_plain;f=Utils%2FMetapost.tex;h=a9b485a205f6b4959c480e96f9546a756512b244;hp=6d00ae47ca901d393b16de523de9d376f8d95833;hb=0ab64c5ce2ab968001c96475b310cf6f020bd475;hpb=dadae33d89b183cb9aab04b4a82dab53c4cf2ce4

diff --git a/Utils/Metapost.tex b/Utils/Metapost.tex
index 6d00ae4..a9b485a 100644
--- a/Utils/Metapost.tex
+++ b/Utils/Metapost.tex
@@ -8,6 +8,7 @@ input metaobj;
 setObjectDefaultOption("Box")("framewidth")(.75mm);
 setObjectDefaultOption("Circle")("framewidth")(.75mm);
 setObjectDefaultOption("Circle")("circmargin")(3mm);
+setObjectDefaultOption("Mux")("framewidth")(.75mm);
 %ahlength := 1.5mm;
 ahangle := 60;
 
@@ -49,7 +50,8 @@ vardef newReg@#(expr v) text options=
       "xpart @#out = xpart @#e",
       "xpart @#d = xpart @#ck = xpart @#w",
     fi
-    "ypart @#d = ypart @#out = ypart (@#sw * .25 + @#nw * .75)",
+    "ypart @#out = ypart midpoint(@#n, @#s)",
+    "ypart @#d = ypart (@#sw * .25 + @#nw * .75)",
     "ypart @#ck = ypart (@#sw * .75 + @#nw * .25)";
 
   StandardTies;
@@ -94,4 +96,66 @@ define_global_boolean_option("labels");
 setObjectDefaultOption("Reg")("reflect")(false);
 setObjectDefaultOption("Reg")("labels")(false);
 
+% Define a Multiplexer.
+vardef newMux@# text options=
+  ExecuteOptions(@#)(options);
+  assignObj(@#,"Mux");
+  StandardInterface;
+  % Add ports
+  ObjPoint inpa, inpb, out, sel;
+ 
+  ObjCode MinimumStandardEquations,
+    % Make it a parallel trapezium
+    "xpart(@#ne - @#nw) = xpart(@#se - @#sw)",
+    "ypart(@#ne - @#nw) = -1 * ypart(@#se - @#sw)",
+    % Use a 22.5 degree angle for the sides
+    "ypart(@#nw) - ypart(@#ne) = xpart(@#ne-@#nw) / 2",
+    % With a specific width and height
+    "@#e-@#w = (" & decimal OptionValue@#("width") & ", 0mm)",
+    "@#n-@#s = (0mm, " & decimal OptionValue@#("height") & ")",
+    % And space the input ports evenly
+    "@#inpa = midpoint(@#nw, @#w)",
+    "@#inpb = midpoint(@#w, @#sw)",
+    "@#out = @#e", 
+    "@#sel = @#n"; 
+
+  StandardTies;
+enddef;
+
+% Draw a multiplexer
+def drawMux(suffix mux)=
+  draw mux.n -- mux.s;
+  % Use our bounding path to draw
+  drawFramedOrFilledObject_(mux);
+enddef;
+
+% Bounding path for a multiplexer
+def BpathMux(suffix n)=StandardBpath(n) enddef;
+
+% Define options
+define_local_numeric_option("width");
+define_local_numeric_option("height");
+setObjectDefaultOption("Mux")("width")(5mm);
+setObjectDefaultOption("Mux")("height")(15mm);
+setObjectDefaultOption("Mux")("framed")(true);
+% Overidden above
+%setObjectDefaultOption("Mux")("framewidth")(.5bp);
+setObjectDefaultOption("Mux")("framecolor")(black);
+setObjectDefaultOption("Mux")("framestyle")("");
+setObjectDefaultOption("Mux")("shadow")(false);
+setObjectDefaultOption("Mux")("shadowcolor")(black);
+setObjectDefaultOption("Mux")("filled")(false);
+setObjectDefaultOption("Mux")("fillcolor")(black);
+
+
+def midpoint(expr a, b) = ((a + b) / 2) enddef;
+
 \stopMPinclusions
+
+% Make \overrightarrow "unexpanded", to make it work within metapost.
+% http://www.ntg.nl/pipermail/ntg-context/2009/043620.html. Will be fixed in
+% context.
+\let\normaloverrightarrow\overrightarrow                                                                                                                     
+\unexpanded\def\overrightarrow{\normaloverrightarrow} 
+
+% vim: set sw=2 sts=2 expandtab: