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205 | def render_svg(
layout: list[dict],
edges: list[tuple[str, str]],
title: str = "Dataflow Canvas",
) -> str:
"""Render canvas layout + edges as an SVG string.
Args:
layout: output of DomoDataflow_Definition.canvas_layout()
edges: output of DomoDataflow_Definition.canvas_edges()
list of (source_element_id, target_element_id)
title: diagram title shown at top
Returns:
SVG string
"""
if not layout:
return '<svg xmlns="http://www.w3.org/2000/svg" width="400" height="100"><text x="20" y="40">No canvas data</text></svg>'
# Compute canvas bounds
x_max = max(el["x"] + el["w"] for el in layout)
y_max = max(el["y"] + el["h"] for el in layout)
width = x_max + PADDING * 2
height = y_max + PADDING * 2 + 30 # 30 for title
# Build id → element lookup for edge rendering
id_to_el = {el["id"]: el for el in layout}
parts: list[str] = []
parts.append(
f'<svg xmlns="http://www.w3.org/2000/svg" '
f'width="{width}" height="{height}" '
f'style="font-family:sans-serif;background:#FAFAFA">'
)
# Title
parts.append(
f'<text x="{PADDING}" y="24" font-size="14" font-weight="bold" '
f'fill="#333">{_escape(title)}</text>'
)
offset_y = 30 # shift everything down to make room for title
def tx(x: int) -> int:
return x + PADDING
def ty(y: int) -> int:
return y + PADDING + offset_y
# 1 — Sections first (background layer)
for el in layout:
if el["type"] != "Section":
continue
x, y, w, h = tx(el["x"]), ty(el["y"]), el["w"], el["h"]
label = _escape(_short_label(el["label"], 40))
parts.append(
f'<rect x="{x}" y="{y}" width="{w}" height="{h}" rx="6" '
f'fill="{_SECTION_FILL}" stroke="{_SECTION_STROKE}" stroke-width="1.5" '
f'stroke-dasharray="6,3"/>'
)
parts.append(
f'<text x="{x + 8}" y="{y + 18}" font-size="11" fill="{_SECTION_TEXT}" '
f'font-style="italic">{label}</text>'
)
# 2 — Edges (drawn under tiles)
for src_id, tgt_id in edges:
src = id_to_el.get(src_id)
tgt = id_to_el.get(tgt_id)
if not src or not tgt:
continue
# right-center of source → left-center of target
x1 = tx(src["x"]) + src["w"]
y1 = ty(src["y"]) + src["h"] // 2
x2 = tx(tgt["x"])
y2 = ty(tgt["y"]) + tgt["h"] // 2
cx = (x1 + x2) // 2
parts.append(
f'<path d="M{x1},{y1} C{cx},{y1} {cx},{y2} {x2},{y2}" '
f'fill="none" stroke="{_EDGE_COLOR}" stroke-width="1.5" '
f'marker-end="url(#arrow)"/>'
)
# 3 — Tiles
for el in layout:
if el["type"] != "Tile":
continue
x, y, w, h = tx(el["x"]), ty(el["y"]), el["w"], el["h"]
color = _tile_color(el["id"])
label = _escape(_short_label(el["label"]))
action_type = el["id"].split("-")[0] if "-" in el["id"] else el["id"]
type_label = _escape(_short_label(action_type, 18))
parts.append(
f'<rect x="{x}" y="{y}" width="{w}" height="{h}" rx="4" '
f'fill="{color}" stroke="none"/>'
)
# type label (small, top)
parts.append(
f'<text x="{x + w // 2}" y="{y + 16}" text-anchor="middle" '
f'font-size="9" fill="{_TEXT_COLOR}" opacity="0.8">{type_label}</text>'
)
# name label (main)
parts.append(
f'<text x="{x + w // 2}" y="{y + 38}" text-anchor="middle" '
f'font-size="11" font-weight="bold" fill="{_TEXT_COLOR}">{label}</text>'
)
# 4 — Comments (top layer)
for el in layout:
if el["type"] != "Comment":
continue
x, y, w, h = tx(el["x"]), ty(el["y"]), el["w"], el["h"]
label = _escape(_short_label(el["label"], 36))
parts.append(
f'<rect x="{x}" y="{y}" width="{w}" height="{h}" rx="3" '
f'fill="{_COMMENT_FILL}" stroke="{_COMMENT_STROKE}" stroke-width="1.5"/>'
)
# dog-ear
parts.append(
f'<polygon points="{x + w - 12},{y} {x + w},{y + 12} {x + w - 12},{y + 12}" '
f'fill="{_COMMENT_STROKE}"/>'
)
parts.append(
f'<text x="{x + 8}" y="{y + 20}" font-size="11" '
f'fill="{_SECTION_TEXT}">{label}</text>'
)
# Arrow marker def
parts.insert(
1,
'<defs><marker id="arrow" markerWidth="8" markerHeight="8" '
'refX="6" refY="3" orient="auto">'
f'<path d="M0,0 L0,6 L8,3 z" fill="{_EDGE_COLOR}"/>'
"</marker></defs>",
)
parts.append("</svg>")
return "\n".join(parts)
|