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svg.py
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svg.py
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import json
import os
from xml.etree import ElementTree
_KEY_SIZE = 80
_KEY_SIZE_RADIUS = 10
_KEY_MARGIN = 4
_KEY_PADDING = 10
_COMBO_RADIUS = 12
_SVG_PADDING = 40
_SVG_STYLE = """
text {
font-family: sans-serif;
font-size: 12px;
fill: rgb(50, 50, 50);
dominant-baseline: central;
text-anchor: middle;
}
text.top { dominant-baseline: hanging; }
text.bottom { dominant-baseline: alphabetic; }
text.left { text-anchor: start; }
text.right { text-anchor: end; }
text.base { font-size: 14px; font-weight: 700; }
text.lower { fill: rgb(115, 162, 217); }
text.raise { fill: rgb(217, 148, 69); }
text.adjust { fill: rgb(124, 171, 125); }
text.hold { fill: rgb(150, 150, 150); }
rect, ellipse { fill: rgb(245, 245, 245); }
rect.home { stroke: rgb(225, 225, 225); stroke-width: 1.5px; }
rect.lower { fill: rgb(213, 229, 247); }
rect.raise { fill: rgb(247, 231, 213); }
rect.adjust { fill: rgb(224, 240, 224); }
rect.hold { fill: rgb(225, 225, 225); }
circle.combo {
stroke: rgb(200, 200, 200);
fill: rgb(225, 225, 225);
}
text.combo { font-size: 10px; }
"""
class SvgLayout(object):
@classmethod
def load(cls, keyboard_dir):
with open(os.path.join(keyboard_dir, "svg_layout.json")) as f:
keys = []
for key in json.load(f):
keys.append(_Key(**key))
return cls(keys)
def __init__(self, keys):
self.keys = keys
def render(self, keymap, output_file):
# Attach keymap to keys.
for layer in keymap.layers:
for key, code in zip(self.keys, layer.key_codes()):
key.add_key_code(layer.name.lower(), code)
# Compute viewbox
top = -_SVG_PADDING
left = -_SVG_PADDING
width = (
max(key.x + key.width + _KEY_MARGIN for key in self.keys) + 2 * _SVG_PADDING
)
height = (
max(key.y + key.height + _KEY_MARGIN for key in self.keys)
+ 2 * _SVG_PADDING
)
# Create svg file
svg = ElementTree.Element(
"svg",
{
"xmlns": "http://www.w3.org/2000/svg",
"viewBox": f"{top} {left} {width} {height}",
},
)
style = ElementTree.SubElement(svg, "style")
style.text = _SVG_STYLE
# Render keys.
for key in self.keys:
key.render(svg)
# Render combos.
for combo in keymap.combos:
i1 = keymap.get_keycode_index(combo.triggers[0].raw)
i2 = keymap.get_keycode_index(combo.triggers[1].raw)
assert i1 + 1 == i2 # only support adjacent keys
_Combo(self.keys[i1], self.keys[i2], combo.code).render(svg)
# Write out rendered svg.
with open(output_file, "wb") as f:
tree = ElementTree.ElementTree(svg)
ElementTree.indent(tree)
tree.write(f)
class _Key(object):
def __init__(self, x, y, **kwargs):
self.x = x * _KEY_SIZE + _KEY_MARGIN
self.y = y * _KEY_SIZE + _KEY_MARGIN
self.width = kwargs.get("w", 1) * _KEY_SIZE - 2 * _KEY_MARGIN
self.height = kwargs.get("h", 1) * _KEY_SIZE - 2 * _KEY_MARGIN
self.home = kwargs.get("home", False)
self.encoder = kwargs.get("encoder", False)
self.key_codes = {}
def add_key_code(self, layer, key_code):
self.key_codes[layer] = key_code
def render(self, svg):
for key_code in self.key_codes.values():
if self.encoder:
self._draw_encoder(svg, key_code)
return
self._draw_border(svg)
for layer, key_code in self.key_codes.items():
# Tap:
if key_code.tap:
self._draw_label(svg, key_code.tap, layer)
# Hold:
if key_code.layer:
self._draw_hold(svg, key_code.hold, key_code.layer.lower())
elif key_code.hold:
self._draw_hold(svg, key_code.hold, "hold")
def _draw_border(self, svg):
classes = "home" if self.home else ""
ElementTree.SubElement(
svg,
"rect",
{
"x": str(self.x),
"y": str(self.y),
"width": str(self.width),
"height": str(self.height),
"rx": str(_KEY_SIZE_RADIUS),
"class": classes,
},
)
def _draw_hold(self, svg, label, layer="hold"):
ElementTree.SubElement(
svg,
"rect",
{
"x": str(self.x),
"y": str(self.y + self.height - 2 * _KEY_SIZE_RADIUS),
"width": str(self.width),
"height": str(2 * _KEY_SIZE_RADIUS),
"rx": str(_KEY_SIZE_RADIUS),
"class": layer,
},
)
ElementTree.SubElement(
svg,
"text",
{
"x": str(self.x + self.width / 2),
"y": str(self.y + self.height - _KEY_SIZE_RADIUS),
"class": layer,
},
).text = label
def _draw_label(self, svg, label, layer, class_=None):
classes = [class_ or layer]
if layer == "base":
dx = self.width / 2
dy = self.height / 2
elif layer in ("lower", "raise"):
dx = self.width - _KEY_PADDING
dy = _KEY_PADDING
classes.extend(["top", "right"])
elif layer == "adjust":
dx = _KEY_PADDING
dy = _KEY_PADDING
classes.extend(["top", "left"])
else:
raise Exception(f"Unknown layer: {layer}")
ElementTree.SubElement(
svg,
"text",
{
"x": str(self.x + dx),
"y": str(self.y + dy),
"class": " ".join(classes),
},
).text = label
def _draw_encoder(self, svg, key_code):
cx = self.x + self.width / 2
cy = self.y + self.height / 2
ElementTree.SubElement(
svg,
"ellipse",
{
"cx": str(cx),
"cy": str(cy),
"rx": str(self.width / 2),
"ry": str(self.height / 2),
},
)
ElementTree.SubElement(
svg,
"text",
{
"x": str(cx),
"y": str(cy),
"class": "center",
},
).text = key_code.tap
class _Combo(object):
def __init__(self, k1, k2, keycode):
self.k1 = k1
self.k2 = k2
self.keycode = keycode
def render(self, svg):
cx = (self.k1.x + self.k2.x) / 2 + _KEY_SIZE / 2 - _KEY_MARGIN
cy = (self.k1.y + self.k2.y) / 2 + _KEY_SIZE / 2 - _KEY_MARGIN
ElementTree.SubElement(
svg,
"circle",
{
"cx": str(cx),
"cy": str(cy),
"r": str(_COMBO_RADIUS),
"class": "combo",
},
)
ElementTree.SubElement(
svg,
"text",
{
"x": str(cx),
"y": str(cy),
"class": "combo",
},
).text = self.keycode.tap