Tool modifiers at a glance in Dottie on Mac

Every modifier for every tool, in one table. Blank cells mean the modifier has no effect for that tool.

Drawing tools

Tool	Shift	Command	Option	Control
Pencil, Pen, Airbrush	Line to point	Erase while held	Secondary colour	Pick colour
Smudge	Straight smudge	—	—	Pick colour
Colour Shift	—	Shift backward	—	Pick colour
Clone	—	—	Click sets the source	Pick colour
Eraser	Line to point	—	—	—
Fill	Drag for gradient fill	Outline fill	—	Non-contiguous fill; with Command, outline + corners
Line	Snap to 15°	—	—	—
Rectangle, Oval	Constrain square/circle	Filled	Draw from centre	—

Vector tools

Tool	Shift	Command	Option	Control
Vector Select	Add to object selection	—	Subtract from object selection	—
Poly Line	—	—	—	—
Vector Rectangle, Oval	Constrain square/circle	Filled	Draw from centre	—
Vector Line	Snap to 15°	—	—	—

Selection tools

Tool	Shift	Option	Shift + Option	Control
All selection tools	Add to selection	Subtract from selection	Intersect	—
Select Wand	Add	Subtract	Intersect	Non-contiguous (whole layer)
Inside a selection	—	Drag moves a copy	—	—

Palette chips

Click	Sets
Click	Primary colour
`Option`-click	Secondary colour
`Shift`-click	Eraser colour
`Command`-click	Toggle protection

Anywhere on the canvas: hold Space to pan.

Tileset mode

On the sheet, Command-click a tile to make it active without painting, and keep Command held to drag that tile to another cell. Those gestures yield to the Command column above whenever the current tool uses Command as a stroke modifier—Pencil, Pen, and Airbrush erase; Fill outlines; Rectangle and Oval fill; Colour Shift goes backwards. Switch to Line, Eraser, Smudge, or a selection tool when you want to rearrange tiles. While Wrap Tiles is on, Command always stays with the tool.

Command-right-click a tile for Select, Duplicate, Clear, Shift, or Delete. A plain right-click still paints with the secondary colour.