add h19rack for a ported half 19inch rackmount

.gitignore

@@ -7,6 +7,7 @@
 *.ud
 build/
 dist/
+env/
 inkex/*.inx
 boxes.py.egg-info/
 boxes.egg-info/

boxes/generators/h19rack.py

@@ -0,0 +1,100 @@
+"""Half 19inch rack unit for musical equipment."""
+
+from boxes import Boxes
+from boxes.edges import Edge
+
+class H19Rack(Boxes):
+    """Half 19inch rack unit for musical equipment."""
+    ru_count = 1
+    holes = "xxmpwx"
+    z = 20
+    deepz = 124
+    earside = 'r'
+
+    # provided by default via boxes
+    x, y, = 0, 0
+    thickness = 3
+
+    def __init__(self):
+        super().__init__()
+        self.argparser.add_argument(
+            '--ru_count', action='store', type=float, default=self.ru_count,
+            help='number of rack units')
+        self.argparser.add_argument(
+            '--holes', action='store', type=str, default=self.holes,
+            help='holes, x=xlr, m=midi, p=9v-power, w=6.5mm-wire')
+        self.argparser.add_argument(
+            '--z', action='store', type=float, default=self.z,
+            help='depth of the shorter (rackear) side')
+        self.argparser.add_argument(
+            '--deepz', action="store", type=float, default=self.deepz,
+            help='depath of the longer (screwed to another half sized thing) side')
+
+    def render(self):
+        """Render box."""
+        # pylint: disable=invalid-name
+        t = self.thickness
+        z = self.z
+        self.x = x = 223 - (2 * t)
+        self.y = y = (self.ru_count * 44.45) - 4.45 - (2 * t)
+        deepz = self.deepz
+
+        # front
+        self.flangedWall(x, y, "FFFF", callback=[self.util_holes, self.rack_holes], r=t,
+                         flanges=[0, 17, 0, 0], move="up")
+
+        # top&bottom
+        self.trapezoidWall(x, deepz, z, "fFeF", move="up")
+        self.trapezoidWall(x, deepz, z, "fFeF", move="up")
+
+        # side
+        self.rectangularWall(deepz, y, "fffe", move="right")
+        self.rectangularWall(z, y, "fffe", move="up")
+
+    def rack_holes(self):
+        """Rackmount holes."""
+        t = self.thickness # pylint: disable=invalid-name
+        self.rectangularHole(6 + t, 10, 10, 6.5, r=3.25)
+        self.rectangularHole(self.y - 6 + t, 10, 10, 6.5, r=3.25)
+
+    def util_holes(self):
+        """Add holes."""
+        self.moveTo(10, self.y / 2 + self.thickness)
+        for hole in self.holes:
+            self.hole_map.get(hole, lambda _: None)(self)
+
+    def hole_xlr(self):
+        """Hole for a xlr port."""
+        self.moveTo(16)
+        self.hole(-9.5, 12, 1)
+        self.hole(0, 0, 11.8)
+        self.hole(9.5, -12, 1)
+        self.moveTo(16)
+
+    def hole_midi(self):
+        """Hole for a midi port."""
+        self.moveTo(17)
+        self.hole(-11.1, 0, 1)
+        self.hole(0, 0, 7.5)
+        self.hole(11.1, 0, 1)
+        self.moveTo(17)
+
+    def hole_power(self):
+        """Hole for a 9v power port."""
+        self.moveTo(11)
+        self.rectangularHole(0, 0, 9, 11)
+        self.moveTo(11)
+
+    def hole_wire(self):
+        """Hole for a wire."""
+        self.moveTo(3)
+        self.hole(0, 0, 3.25)
+        print('hi')
+        self.moveTo(3)
+
+    hole_map = {
+        'm': hole_midi,
+        'p': hole_power,
+        'w': hole_wire,
+        'x': hole_xlr,
+    }