[AC] [DA] and [ACDC] added

web/app.py

@@ -101,6 +101,57 @@ _FRAC_AXIS = 0.32
 _FRAC_GAP = 0.14
 _FRAC_SIDE = 0.12
 
+_SYM_WIDTH = 0.75
+_SYM_HEIGHT = 0.50
+_SYM_LW = 0.08
+_SYM_RISE = 0.25
+
+
+def _symbol_svg(name: str, x: float, y: float, fs: float, fill: str) -> str:
+    w = fs * _SYM_WIDTH
+    h = fs * _SYM_HEIGHT
+    lw = fs * _SYM_LW
+    yc = y - _SYM_RISE * fs
+    stroke = f"fill:none;stroke:{fill};stroke-width:{lw:.5f};stroke-linecap:round"
+
+    if name == "ac":
+        d = (
+            f"M {x:.5f},{yc:.5f}"
+            f" C {x + w / 3:.5f},{yc - h / 2:.5f}"
+            f"  {x + 2 * w / 3:.5f},{yc + h / 2:.5f}"
+            f"  {x + w:.5f},{yc:.5f}"
+        )
+        return f'<path style="{stroke}" d="{d}"/>'
+
+    elif name == "dc":
+        dash = w / 5
+        gap = w / 5
+        y1 = yc - h / 4
+        y2 = yc + h / 4
+        p1 = f'<line x1="{x:.5f}" y1="{y1:.5f}" x2="{x + w:.5f}" y2="{y1:.5f}" style="{stroke}" />'
+        p2 = f'<line x1="{x:.5f}" y1="{y2:.5f}" x2="{x + dash:.5f}" y2="{y2:.5f}" style="{stroke}" />'
+        p3 = f'<line x1="{x + dash + gap:.5f}" y1="{y2:.5f}" x2="{x + 2 * dash + gap:.5f}" y2="{y2:.5f}" style="{stroke}" />'
+        p4 = f'<line x1="{x + 2 * dash + 2 * gap:.5f}" y1="{y2:.5f}" x2="{x + w:.5f}" y2="{y2:.5f}" style="{stroke}" />'
+        return p1 + "\n    " + p2 + "\n    " + p3 + "\n    " + p4
+
+    else:  # acdc
+        y_wave = yc - h / 4
+        y_dash = yc + h / 4
+        dash = w / 5
+        gap = w / 5
+        d = (
+            f"M {x:.5f},{y_wave:.5f}"
+            f" C {x + w / 3:.5f},{y_wave - h / 2:.5f}"
+            f"  {x + 2 * w / 3:.5f},{y_wave + h / 2:.5f}"
+            f"  {x + w:.5f},{y_wave:.5f}"
+        )
+        p1 = f'<path style="{stroke}" d="{d}"/>'
+        p2 = f'<line x1="{x:.5f}" y1="{y_dash:.5f}" x2="{x + dash:.5f}" y2="{y_dash:.5f}" style="{stroke}" />'
+        p3 = f'<line x1="{x + dash + gap:.5f}" y1="{y_dash:.5f}" x2="{x + 2 * dash + gap:.5f}" y2="{y_dash:.5f}" style="{stroke}" />'
+        p4 = f'<line x1="{x + 2 * dash + 2 * gap:.5f}" y1="{y_dash:.5f}" x2="{x + w:.5f}" y2="{y_dash:.5f}" style="{stroke}" />'
+        return p1 + "\n    " + p2 + "\n    " + p3 + "\n    " + p4
+
+
 _UNIT_BOX_X0, _UNIT_BOX_X1 = UNIT_X - 15.0, UNIT_X + 15.0
 _UNIT_BOX_Y0, _UNIT_BOX_Y1 = UNIT_Y - 6.0, UNIT_Y + 6.0
 _UNIT_MAX_FS = 9.46938021
@@ -182,6 +233,16 @@ def _parse_markup(s: str):
             inner, j = _extract_braced(s, i)
             nodes.append(_parse_braced(inner))
             i = j
+        elif c == "[":
+            end = s.find("]", i + 1)
+            if end > i:
+                name = s[i + 1 : end].lower()
+                if name in ("ac", "dc", "acdc"):
+                    nodes.append(("sym", name))
+                    i = end + 1
+                    continue
+            nodes.append(("lit", c))
+            i += 1
         else:
             nodes.append(("lit", c))
             i += 1
@@ -205,6 +266,8 @@ def _measure(nodes, fs: float, fd: _FontData) -> float:
                 max(_measure(n[1], fs2, fd), _measure(n[2], fs2, fd))
                 + 2 * _FRAC_SIDE * fs2
             )
+        elif n[0] == "sym":
+            w += fs * _SYM_WIDTH
     return w
 
 
@@ -238,6 +301,8 @@ def _vbounds(nodes, fs: float, fd: _FontData):
             dt, db = _vbounds(n[2], fs2, fd)
             a = min(nt + num_base, axis)
             b = max(db + den_base, axis)
+        elif n[0] == "sym":
+            a, b = -_SYM_HEIGHT / 2 * fs, _SYM_HEIGHT / 2 * fs
         else:
             continue
         lo, hi = min(lo, a), max(hi, b)
@@ -279,6 +344,9 @@ def _draw_nodes(nodes, x: float, y: float, fs: float, fill: str, fd: _FontData):
                 f' style="stroke:{fill};stroke-width:{fs * 0.055:.5f};stroke-linecap:butt" />'
             )
             cx += bar_w
+        elif n[0] == "sym":
+            parts.append(_symbol_svg(n[1], cx, y, fs, fill))
+            cx += fs * _SYM_WIDTH
     return parts, cx - x