imtypeset

Typeset text for Dear ImGui: paragraphs broken into lines the way TeX breaks them, justified and kerned, formulas written as $...$ set by a math engine, tables, columns, selection and copying, drawn through ImGui's own font atlas into your own windows.

This distribution is the Python route. It is a C++ library and a ctypes package over its C ABI, for an application that runs on the imgui-bundle wheel. The library holds no Dear ImGui of its own: it binds to the one inside the installed imgui-bundle and draws into the application's context. The C++ library, its documentation and the demo are in the repository.

One imtypeset for one imgui-bundle

A library that shares Dear ImGui's structs with another binary is built for exactly that binary. So every file here is built for one imgui-bundle version and requires it exactly, and the version says which:

imtypeset 0.4.1.192900     is imtypeset 0.4.1 for imgui-bundle 1.92.900
imtypeset 0.4.1.192801     is imtypeset 0.4.1 for imgui-bundle 1.92.801

The fourth number is the imgui-bundle version written as one number (1.92.900 is 192900). Pin both, exactly, and move them together:

imgui-bundle==1.92.900
imtypeset==0.4.1.192900

• imtypeset==0.4.1 matches nothing: the version has four numbers.
• imtypeset==0.4.1.* beside an exact imgui-bundle==X resolves to the build for X.
• pip install imtypeset with nothing else pinned takes the newest line and installs the imgui-bundle it was built for, replacing another one.

import imtypeset checks the pair before it loads anything and raises ImportError with a sentence that says what to install if they do not match.

Where there are wheels

Nowhere else: not Windows, not Linux on arm64 or with musl, not macOS on Intel (for which imgui-bundle has no wheel either). There is no source distribution, so on those pip finds nothing to install and says so; a package that depends on imtypeset should say so with an environment marker (docs/releasing.md has the line).

Using it

import os
import imgui_bundle
from imgui_bundle import imgui
import imtypeset as ts

imgui.create_context()  # an application has one already
imgui.get_io().backend_flags |= imgui.BackendFlags_.renderer_has_textures
ts.create_context()     # after ImGui's context, and destroyed before it
fonts = os.path.join(os.path.dirname(imgui_bundle.__file__), "assets", "fonts")
ts.add_font(ts.Face.Regular, os.path.join(fonts, "DroidSans.ttf"))
doc = ts.Document.from_blocks([ts.Block(text="Text set in lines of even colour, the way TeX sets it.")])
doc.layout(240.0)
print(ts.version(), doc.size(), doc.range_text(((0, 0), (0, 8))))
ts.destroy_context()

That runs with no window and prints 0.4.1 (240.0, 31.0) Text set. In an application the document is laid out and drawn each frame, inside a window:

doc.layout(imgui.get_content_region_avail().x)
at = imgui.get_cursor_screen_pos()
doc.draw(None, (at.x, at.y))  # None: the current window's draw list

imtypeset.host_info() says which library was loaded and how the pair was checked.

More

• What a wheel is, and what import imtypeset checks
• What a version promises, and what to pin
• Changelog
• Which Python calls raise, and what

MIT licence. The wheel carries the notices of what the library derives from (Dear ImGui, fontTools, Unicode data) beside its own licence.

This file

A release has one file per platform and CPython, and a page shows this section from one of them.

• imtypeset 0.4.1, built for imgui-bundle==1.92.900 (Dear ImGui 1.92.9), CPython 3.11, Darwin arm64.
• Dear ImGui headers: fork:c9a0a84f8a4ddae794a9e1acf6a93afce73d5057.
• Checked: imgui-check+probe, 26 probe rows, on 2026-10-13T17:05:15Z (GitHub Actions run 38434871056 of WalterCReel3/imtypeset at e6160c0f83bbb6c7c41dba62ff0736a956ba7d9b).