---
jupyter:
  description: 'Dimensioned drawings in planex2d: px.Drawing draws a constraint sketch with its own dimensions as a
    drafting drawing, laid out automatically and placed by hand where wanted; px.Sheet puts views at one scale on a
    sheet with tables, notes and a title block, written as SVG, PDF and DXF.'
---

# Drawings

A constraint sketch already holds what a drawing needs: its outline, and the dimensions that define it.
`px.Drawing(sk)` draws the sketch as a drafting drawing, with extension and dimension lines, closed arrows and the
values above the lines, radii and diameters on their leaders, equal features dimensioned once with their count, and
the center lines of circles and bolt circles. The drawings aim to follow DIN drafting practice. The layout is
automatic; `Place` puts single dimensions where they belong. The drawing keeps the sketch by reference, so after the
sketch changed, `Update` draws it anew.

`px.Sheet` puts several views at one scale on a sheet: views on the standard planes take their places in first-angle
projection, and the scale is the largest standard one at which the views and their dimensions fit. A sheet carries
tables, notes, a frame and a title block, and is written at true scale as SVG, as PDF that prints 1:1, and as DXF
with real dimension entities that a CAD program can edit.

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<p class="px-label">In this section</p>
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- [A dimensioned drawing](dimensioned-drawing.md)
- [Placing dimensions](placing.md)
- [Center lines and axes](center-lines.md)
- [Views and sheets](sheets.md)
- [Title blocks and files](title-blocks.md)
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<div class="px-cards">
<a class="px-card" href="dimensioned-drawing.html"><div class="thumb"><img src="../../_static/sections/drawings/dimensioned-drawing.png" alt="A dimensioned drawing"></div><b>A dimensioned drawing</b><span>A bearing plate's sketch drawn with its own dimensions, and drawn anew after a change.</span></a>
<a class="px-card" href="placing.html"><div class="thumb"><img src="../../_static/sections/drawings/placing.png" alt="Placing dimensions"></div><b>Placing dimensions</b><span>Offsets, directions, leaders, counts, texts and supplementary angles.</span></a>
<a class="px-card" href="center-lines.html"><div class="thumb"><img src="../../_static/sections/drawings/center-lines.png" alt="Center lines and axes"></div><b>Center lines and axes</b><span>Bolt circles as center lines, crosses, and the axis of a turned pin.</span></a>
<a class="px-card" href="sheets.html"><div class="thumb"><img src="../../_static/sections/drawings/sheets.png" alt="Views and sheets"></div><b>Views and sheets</b><span>A front and a top view in first-angle projection, with a table and notes.</span></a>
<a class="px-card" href="title-blocks.html"><div class="thumb"><img src="../../_static/sections/drawings/title-blocks.png" alt="Title blocks and files"></div><b>Title blocks and files</b><span>A frame and a title block, and the sheet as SVG, PDF and DXF.</span></a>
</div>
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