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+%% Simple \MF{} symbol example: light bulb
+%% (Demonstrates simplicity, not necesarily good style)
+
+mode_setup; % Target a given printer.
+
+define_pixels(em, cap, sb); % Convert to device-specific units.
+define_corrected_pixels(o); % Same, but add a device-specific fudge factor.
+
+%% Define a light bulb at the character position for ``A'' with width
+%% 1/2 em\#, height cap\#, and depth 1pt\#.
+beginchar("A", 1/2 em#, cap#, 1pt#); "A light bulb";
+ pickup pencircle scaled 1/2pt; % Use a pen with a small, circular tip.
+
+ %% Define the points we need.
+ top z1 = (w/2, h+o); % z1 is at the top of a circle.
+ rt z2 = (w+sb+o-x4, y4); % z2 is at the same height as z4 but opposite side.
+ bot z3 = (z1 - (0, w-sb-o)); % z3 is at the bottom of the circle.
+ lft z4 = (sb-o, 1/2[y1,y3]); % z4 is on the left of the circle.
+ path bulb; % Define a path for the bulb itself.
+ bulb = z1 .. z2 .. z3 .. z4 .. cycle; % The bulb is a closed path.
+
+ z5 = point 2-1/3 of bulb; % z5 lies on the bulb, a little to the right of z3.
+ z6 = (x5, 0); % z6 is at the bottom, directly under z5.
+ z7 = (x8, 0); % z7 is at the bottom, directly under z8.
+ z8 = point 2+1/3 of bulb; % z8 lies on the bulb, a little to the left of z3.
+ bot z67 = (1/2[x6,x7], pen_bot-o-1/8pt); % z67 lies halfway between z6 and z7 but a jot lower.
+
+ %% Draw the bulb and the base.
+ draw bulb; % Draw the bulb proper.
+ draw z5 -- z6 .. z67 .. z7 -- z8; % Draw the base of the bulb.
+
+ %% Display key positions and points to help us debug.
+ makegrid (0, sb, w/2, w-sb) (0, -1pt, y2, h); % Label interesting x and y coordinates.
+ penlabels(1,2,3,4,5,6,67,7,8); % Label control points for debugging.
+endchar;
+end