from nbdev.showdoc import show_docSVG
Simple SVG FT elements
You can create SVGs directly from strings, for instance (as always, use NotStr or Safe to tell FastHTML to not escape the text):
svg = '<svg width="50" height="50"><circle cx="20" cy="20" r="15" fill="red"></circle></svg>'
show(NotStr(svg))You can also use libraries such as fa6-icons.
To create and modify SVGs using a Python API, use the FT elements in fasthtml.svg, discussed below.
Note: fasthtml.common does NOT automatically export SVG elements. To get access to them, you need to import fasthtml.svg like so
from fasthtml.svg import *Svg
Svg (*args, viewBox=None, h=None, w=None, height=None, width=None, xmlns='http://www.w3.org/2000/svg', **kwargs)
An SVG tag; xmlns is added automatically, and viewBox defaults to height and width if not provided
To create your own SVGs, use SVG. It will automatically set the viewBox from height and width if not provided.
All of our shapes will have some convenient kwargs added by using ft_svg:
ft_svg
ft_svg (tag:str, *c, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
Create a standard FT element with some SVG-specific attrs
Basic shapes
We’ll define a simple function to display SVG shapes in this notebook:
def demo(el, h=50, w=50): return show(Svg(h=h,w=w)(el))Rect
Rect (width, height, x=0, y=0, fill=None, stroke=None, stroke_width=None, rx=None, ry=None, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
A standard SVG rect element
All our shapes just create regular FT elements. The only extra functionality provided by most of them is to add additional defined kwargs to improve auto-complete in IDEs and notebooks, and re-order parameters so that positional args can also be used to save a bit of typing, e.g:
demo(Rect(30, 30, fill='blue', rx=8, ry=8))Circle
Circle (r, cx=0, cy=0, fill=None, stroke=None, stroke_width=None, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
A standard SVG circle element
demo(Circle(20, 25, 25, stroke='red', stroke_width=3))Ellipse
Ellipse (rx, ry, cx=0, cy=0, fill=None, stroke=None, stroke_width=None, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
A standard SVG ellipse element
demo(Ellipse(20, 10, 25, 25))transformd
transformd (translate=None, scale=None, rotate=None, skewX=None, skewY=None, matrix=None)
Create an SVG transform kwarg dict
rot = transformd(rotate=(45, 25, 25))
rot{'transform': 'rotate(45,25,25)'}demo(Ellipse(20, 10, 25, 25, **rot))Line
Line (x1, y1, x2=0, y2=0, stroke='black', w=None, stroke_width=1, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
A standard SVG line element
demo(Line(20, 30, w=3))Polyline
Polyline (*args, points=None, fill=None, stroke=None, stroke_width=None, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
A standard SVG polyline element
demo(Polyline((0,0), (10,10), (20,0), (30,10), (40,0),
fill='yellow', stroke='blue', stroke_width=2))demo(Polyline(points='0,0 10,10 20,0 30,10 40,0', fill='purple', stroke_width=2))Polygon
Polygon (*args, points=None, fill=None, stroke=None, stroke_width=None, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
A standard SVG polygon element
demo(Polygon((25,5), (43.3,15), (43.3,35), (25,45), (6.7,35), (6.7,15),
fill='lightblue', stroke='navy', stroke_width=2))demo(Polygon(points='25,5 43.3,15 43.3,35 25,45 6.7,35 6.7,15',
fill='lightgreen', stroke='darkgreen', stroke_width=2))Text
Text (*args, x=0, y=0, font_family=None, font_size=None, fill=None, text_anchor=None, dominant_baseline=None, font_weight=None, font_style=None, text_decoration=None, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
A standard SVG text element
demo(Text("Hello!", x=10, y=30))Paths
Paths in SVGs are more complex, so we add a small (optional) fluent interface for constructing them:
PathFT
PathFT (tag:str, cs:tuple, attrs:dict=None, void_=False, **kwargs)
A ‘Fast Tag’ structure, containing tag,children,and attrs
Path
Path (d='', fill=None, stroke=None, stroke_width=None, transform=None, opacity=None, clip=None, mask=None, filter=None, vector_effect=None, pointer_events=None, target_id=None, hx_vals=None, hx_target=None, id=None, cls=None, title=None, style=None, accesskey=None, contenteditable=None, dir=None, draggable=None, enterkeyhint=None, hidden=None, inert=None, inputmode=None, lang=None, popover=None, spellcheck=None, tabindex=None, translate=None, hx_get=None, hx_post=None, hx_put=None, hx_delete=None, hx_patch=None, hx_trigger=None, hx_swap=None, hx_swap_oob=None, hx_include=None, hx_select=None, hx_select_oob=None, hx_indicator=None, hx_push_url=None, hx_confirm=None, hx_disable=None, hx_replace_url=None, hx_disabled_elt=None, hx_ext=None, hx_headers=None, hx_history=None, hx_history_elt=None, hx_inherit=None, hx_params=None, hx_preserve=None, hx_prompt=None, hx_request=None, hx_sync=None, hx_validate=None)
Create a standard path SVG element. This is a special object
Let’s create a square shape, but using Path instead of Rect:
- M(10, 10): Move to starting point (10, 10)
- L(40, 10): Line to (40, 10) - top edge
- L(40, 40): Line to (40, 40) - right edge
- L(10, 40): Line to (10, 40) - bottom edge
- Z(): Close path - connects back to start
M = Move to, L = Line to, Z = Close path
demo(Path(fill='none', stroke='purple', stroke_width=2
).M(10, 10).L(40, 10).L(40, 40).L(10, 40).Z())Using curves we can create a spiral:
p = (Path(fill='none', stroke='purple', stroke_width=2)
.M(25, 25)
.C(25, 25, 20, 20, 30, 20)
.C(40, 20, 40, 30, 30, 30)
.C(20, 30, 20, 15, 35, 15)
.C(50, 15, 50, 35, 25, 35)
.C(0, 35, 0, 10, 40, 10)
.C(80, 10, 80, 40, 25, 40))
demo(p, 50, 100)Using arcs and curves we can create a map marker icon:
p = (Path(fill='red')
.M(25,45)
.C(25,45,10,35,10,25)
.A(15,15,0,1,1,40,25)
.C(40,35,25,45,25,45)
.Z())
demo(p)Behind the scenes it’s just creating regular SVG path d attr – you can pass d in directly if you prefer.
print(p.d) M25 45 C25 45 10 35 10 25 A15 15 0 1 1 40 25 C40 35 25 45 25 45 Zdemo(Path(d='M25 45 C25 45 10 35 10 25 A15 15 0 1 1 40 25 C40 35 25 45 25 45 Z'))PathFT.M
PathFT.M (x, y)
Move to.
PathFT.L
PathFT.L (x, y)
Line to.
PathFT.H
PathFT.H (x)
Horizontal line to.
PathFT.V
PathFT.V (y)
Vertical line to.
PathFT.Z
PathFT.Z ()
Close path.
PathFT.C
PathFT.C (x1, y1, x2, y2, x, y)
Cubic Bézier curve.
PathFT.S
PathFT.S (x2, y2, x, y)
Smooth cubic Bézier curve.
PathFT.Q
PathFT.Q (x1, y1, x, y)
Quadratic Bézier curve.
PathFT.T
PathFT.T (x, y)
Smooth quadratic Bézier curve.
PathFT.A
PathFT.A (rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y)
Elliptical Arc.
HTMX helpers
SvgOob
SvgOob (*args, **kwargs)
Wraps an SVG shape as required for an HTMX OOB swap
When returning an SVG shape out-of-band (OOB) in HTMX, you need to wrap it with SvgOob to have it appear correctly. (SvgOob is just a shortcut for Template(Svg(...)), which is the trick that makes SVG OOB swaps work.)
SvgInb
SvgInb (*args, **kwargs)
Wraps an SVG shape as required for an HTMX inband swap
When returning an SVG shape in-band in HTMX, either have the calling element include hx_select='svg>*', or **svg_inb (which are two ways of saying the same thing), or wrap the response with SvgInb to have it appear correctly. (SvgInb is just a shortcut for the tuple (Svg(...), HtmxResponseHeaders(hx_reselect='svg>*')), which is the trick that makes SVG in-band swaps work.)