Draw your own art with a pendulum

1The screen

The whole screen is your canvas. At the top center is the style bar, at the top right the user guide (?) and language switcher, and at the bottom center a floating dock with the controls. After a while of no input they fade away so you can focus on the art (tap the screen to bring them back).

Dock buttons

• Pause / Play — stop or resume the drawing animation.
• Redraw — erase the canvas and all layers (with confirmation).
• Can settings — adjust throw, color, width, ink amount and pendulum physics (→ ch. 4).
• Canvas settings — adjust background color, wallpaper size, light and position (→ ch. 5).
• Layers — manage the visibility and deletion of layers, one per drawing (→ ch. 6).
• Capture — capture the current canvas at wallpaper size and save it to the gallery (→ ch. 7).
• Gallery — view, download and delete captured images (→ ch. 7).

2Basics: throw the can to draw

Just grab the paint can hanging from the central pivot (the glowing dot) and swing it in a circle, then release. The can swings like a pendulum and the dripping paint traces a path on the canvas.

1. Grab the can — drag the can in the center.
2. Swing it in a circle — move it round and round to build up momentum.
3. Release — let go (finger or mouse) and the pendulum starts moving at that speed, drawing the trace.

Change your view

• Zoom — mouse wheel, or on a phone a two-finger pinch.
• Pan (move) — drag the background (anywhere but the can), or move with two fingers on a phone.
• You can reset the view with Canvas settings → Reset position (→ ch. 5).

3Pause & seek bar

As the drawing progresses, a seek bar (time scrub) appears at the bottom.

• Pause / Play (left end of the dock) — stop or resume the drawing animation. Pressing it at the end replays from the start.
• Seek bar — drag the handle left or right to preview the drawing up to that point. Handy for finding the "stop here" look.

4Can settings

Tap the can icon in the dock to open the settings sheet from below. Here you tune the feel of the strokes and the pendulum motion. Changes apply from the next throw.

Throw & effect

• Drawing effect — Line (clean strokes) or Spill (paint drips and spreads).
• Throw style — Normal or Spin throw (the can itself rotates for more intricate patterns).

Can & paint

• Holes & colors — increase or decrease the can's holes (paint outlets) with + / −. Each hole can have its own color for multi-color gradient traces. Pick the hole to edit from the discs below, then set its color with a swatch or "Custom".
• Hole size (line width) — the thickness of the trace.
• Ink amount (stops when empty) — the total paint available per throw. It stops automatically when the ink runs out.
• Paint thickness (impasto) — how raised the paint looks (3D relief). Combined with the light direction it changes the texture.

Pendulum physics

• Cord length — the longer it is, the slower and wider the swing.
• Damping (air resistance) — higher stops sooner (lower keeps drawing longer).
• Earth's rotation (Foucault precession) — the plane of swing slowly rotates, creating swirl-like patterns. Negative values reverse the direction.

The "Reset settings" button at the bottom of the sheet restores only the can settings to their defaults.

5Canvas settings

Use the square icon in the dock to adjust the canvas (background) and how it looks.

Canvas & light

• Background color — the canvas background. Set it with a swatch or "Custom".
• Size (device wallpaper) — pick a device preset (phones, etc.) to draw and capture at that screen ratio and real resolution. You can also enter width × height (px) directly under Custom and press "Apply".
• Light direction — the direction of the shadows cast by the raised paint (impasto).
• Canvas texture — turn the woven fabric texture ON / OFF.

Positioning

• Lock position — fix the view so it won't move by accident.
• Reset position — reset zoom and pan back to the standard centered view.

6Layers

Use the stacked icon in the dock to manage layers. Each throw (drawing) becomes one layer, and you can stack them into a single picture.

• Each layer can be shown / hidden (handy to hide one and check the composition).
• Unwanted layers can be deleted.
• Deleted by mistake? Restore it with "Undo delete" at the bottom.

When you haven't drawn anything yet it shows "No layers yet"; throw the can to draw and your first layer appears.

7Capture & gallery

Once you have a composition you like, save it with the Capture button (◉) in the photo zone.

• Capture — export the current canvas at the size you set and add it to the gallery. The gallery icon shows a count badge.
• Gallery — a list of captured images. For each one you can download or delete, and you can select several to download together.
• The buttons at the bottom of the gallery let you "Delete selected", "Download selected" and "Download all".

8Good to know

• Auto-fading UI — after a while of no input, the style bar, dock and so on fade away so you can focus on the art. Tap the screen to bring them back.
• Warning on refresh — if you have a drawing, layers or unsaved captures, trying to refresh or leave the page shows a confirmation dialog (to prevent accidental loss). Note: the wording is the browser's standard message.
• Settings apply from the next throw — changes to the can settings take effect from your next throw, not the pendulum currently in motion.
• No signup, free — no account needed; just draw and capture.