Esc.

Welcome to Tableaunoir

This online blackboard is ideally used with a graphics tablet. Your audience is concentrated on the content if you hide the toolbar and use keyboard shortcuts.

You may create magnets (think of them as fridge magnets) for making interactive courses, presentations and discussions with students.

Work best on Firefox, Chrome or Chromium, last versions.

About Tableaunoir

Tableaunoir is an online blackboard. It is ideally used with a graphics tablet. Your audience is concentrated on the content if you hide the toolbar and use keyboard shortcuts.

You may create magnets (think of them as fridge magnets) for making interactive courses, presentations and discussions with students.

Work best on Firefox, Chrome or Chromium, last versions.
Tableaunoirxcas is an open source project (GPL3 license). It is a pure JavaScript fork of the 2020 November 1st version of tableaunoir made by Francois Schwarzentruber. It is maintained by Bernard Parisse, you can get the source here. It adds the opportunity to evaluate text magnets with the Giac/Xcas CAS, MicroPython (Damien P. George et al) or Javascript (QuickJS engine by Fabrice Bellard and Charlie Gordon). It may be used offline (unzip the source above and open the file index.html).

Read-only

Export

Cleaning

Add a background

Load

or drag and drop your .tableaunoir file in the application.

Save

Name:

Xcas Angles:

Blackboard keyboard shortcuts

Esc. or F1	show/hide this menu
h	hide toolbar
e	switch between chalk and eraser
c	change the color of the chalk or of the selected magnet
d	divide the screen
3	divide the screen in three parts.
Ctrl+Z	cancel the last action
Ctrl+Y or Ctrl+Shift+Z	redo the last action
← →	move in the board

Text Magnet keyboard shortcuts

k or p or j	create a new magnet with a commandline to be eval-ed with Giac/Xcas, MicroPython or Javascript
Ctrl + Enter	inside a magnet, evaluate magnet with Giac/Xcas, MicroPython or Javascript
Esc.	exit the text edition in a magnet
Ctrl + +	increase the size of the text
Ctrl + -	decrease the size of the text

Magnet keyboard shortcuts

Del	delete the current magnet
Ctrl+x	cut the content inside the drawn contour into a magnet
Ctrl+c	copy the content inside the drawn contour into a magnet
m	cut the content inside the drawn contour into a magnet / flatten the current magnet to the blackboard
Ctrl+v	print the current magnet (like rubber stamping)

Text magnets

, execute , at load
or the magnets trash.
The Magnet (or +) button will create a magnet of type (keyboard shortcut x), (j), (p) or (l).
Type Esc to cancel edition or type Ctrl-Enter to evaluate the magnet.
Examples:

type k 1/3+2/7 Ctrl-Enter to get a computation,
type l x/2 Ctrl-Enter to get the fraction x over 2.
type k factor(x^4-1) Ctrl-Enter to get x^4-1 factored.
type k plot(sin(x)) Ctrl-Enter to get the graph of sin(x)
k circle(0,1) Ctrl-Enter to get a circle

If you select a Javascript magnet, it will be eval-ed by QuickJS in math mode, unless your commandline starts with @ (QuickJS without math mode) or @@ (browser interpreter).

Quick magnet manipulations

Using existing images

In order to use existing images as magnets, drag and drop .png/.svg/.gif/.jpg files.

Predefined Magnet collections

Algorithms

Complexity theory

How to create a magnet?

Draw a contour around the picture
Then press Ctrl+X