Formula text:

Save file

Save

Load file

Selected objects:

Multi use:

Recording:

HELP:

KEYBOARD SHORTCUTS

• cmd / ctrl + z to undo last change.
• cmd / ctrl + c, x and v to copy, cut and paste, respectively.
• ↑ and ↓ to move to textboxes above and below, respectively.
• Page Up and Page Down to move to highest and lowest textboxes, respectively.
• ← and → for previous and next frame.
• cmd / ctrl + return to enter presentation mode.
• esc to escape any tool or presentation mode.
• t for text tool.
• p for pen.
• s for shape tool.
• c for camera.
• v for vector tool.
• ctrl + backspace to delete any selected objects.
• ctrl + i, l, k or j to scale selected object.
• ctrl + u or o to rotate selected object.
• cmd / ctrl + b, m, r or e to start, pause, resume and save a recording, respectively.

THINGS TO DO WITH TEXT BOXES

• x = 5 to assign a value to a variable
• e:x = x + 0.1 to repeatedly update x every frame
• f(x) = sin(x) to define a function
• e:expression to run expression each frame
• slide:var_name then present, and you can slide the box to change the variable value
• e:graph(function_name) to graph function_name(x)

ANIMATION BASICS

1. Create a text, circle or drawing.
2. Change frames with the ← and → arrow keys.
3. Change the text or object's properties on the new frame.
4. Enter presentation mode by hitting cmd / ctrl + return.
5. ← and → arrow keys will show animated transition.
6. Exit presentation mode by pressing esc.

CONTROL CAMERA

• Tap camera or hit c to edit camera.
• Click and drag to pan.
• cmd / ctrl click and drag to rotate.
• The camera will transition smoothly frame to frame.

RECORDING (MP4)

• To start recording, click on Start recording or press ctrl + shift + b.
• To pause, click on Pause recording or press ctrl + shift + m.
• To resume, click on Resume recording or press ctrl + shift + r.
• To stop recording and save, click on Stop recording or press ctrl + shift + e.

FILES

• Tapping save local will overwrite a local file in browser's cache.
• Tapping load local clears your work and load the cached file.
• To save: enter a file name and hit save file.
• To load: hit load file and select your saved file.
• As you edit if you make a mistake you can undo by hitting cmd / ctrl + z.

MORE FUNCTIONS

• L = range(a, b, c) to create array of values from a to b incrementing by c.
• e:view(L, [x, y, z]) print matrix elements at position [x,y,z].
• e:surface(func) to graph y = func(x, z) as a grid of points.
• e:scatter(A) A is n by 3 matrix of points to be scatter plotted.
• A = randn([a, b, c, ...]) to create matrix of random normal values.
• A[1, 2] to index into matrix A with 1 based indexing, not zero! :-(.

SPECIAL VALUES

• _mx and _my: Mouse x and y positions relative to graph.
• _frame current frame (counts up indefinitely).
• _t frame transition from 0 to 1, _tt eased transition.