SolarOS 4.13.4 manual · app

sketch

Pointer-driven graphical paint application. Its layout follows classic desktop paint programs: Save, Open, Import, and the sidebar controls share one aligned, equal-sized button grid; color and pattern choices are in the bottom bar. Sketch uses a compact four-color canvas and stores finished documents as interoperable indexed-color PNG files. Color TFTs show the native palette; one-bit displays use the existing dithered rendering path.

Usage:

sketch
sketch file.png

Sketch is intentionally not gated on a pointer hardware capability. If no ready absolute or relative pointer is registered when the app starts, a popup explains that a pointer can be attached at any time. Press Enter or Esc to dismiss it; the first attached pointer is accepted without restarting the app.

Controls:

• Click Save to update the current PNG. For an untitled or imported image, the

first save selects the next free Sketches/sketchNNN.png path on persistent storage. Saves use a synced staging file, backup rename, atomic replacement, and rollback.

• Click Open to select a PNG as the current document. Click Import to flatten a

PNG, JPEG, or GIF into the current four-color canvas; the next save creates a new PNG instead of overwriting the imported source.

• The sidebar selects pen, straight-line, rectangle, ellipse, bucket fill,

or eraser drawing. The weight control cycles through 1, 2, 4, and 8 pixels. Eraser uses the selected weight and restores white pixels. Clear immediately resets the complete canvas to white.

• Line, rectangle, and ellipse show an exact non-destructive preview during the

drag, including the selected color, pattern, and stroke weight. Releasing the pointer commits that preview to the canvas.

• The first four bottom swatches select white, red, blue, or black. The next

four select solid, checker, dot, or diagonal-hatch application.

• Keyboard fallbacks are S Save, O Open, I Import, P Pen, L Line,

R Rectangle, E Ellipse, B bucket fill, X eraser, and C clear. Arrows and Enter operate the file browser.

• Q, Esc, or the app-exit key exits. Suspending and resuming retains the

current cold-allocated canvas; closing the app releases it and all browser or image resources.