Canvas Toolbar

At the bottom of the canvas sits a toolbar gathering the view controls, slat editing, motif placement and shape drawing buttons. These are shared features, available identically in all six engines (Se-sal, Jeongja-sal, Bit-sal, Gyeokja-bit-sal, Semo-sotgeul-sal and Yukmo-sotgeul-sal).

View Controls

Icon	Function	Description
Zoom in	Zooms the canvas in	Scrolling the wheel up does the same.
Zoom out	Zooms the canvas out	Scrolling the wheel down does the same.
Pan	Moves the canvas by dragging	Click and drag the drawing to move the view.
Reset view	Resets zoom and pan to their defaults	Returns the view to how it looked when you first opened the canvas.

Slat Editing

Icon	Function	How to use
Delete slat	Editing mode for removing slats the algorithm generated	Click a slat to delete it. Clicking a deleted slat again restores it.
Add slat	Editing mode for drawing in new slats that aren't part of the grid	① Click the starting intersection, ② click the ending intersection, and a slat is created between them.
Reset edits	Reverts everything changed by deleting and adding slats	Resets to the default grid the algorithm generated.

Combining the delete and add slat modes lets you remove specific slats from the generated grid and add slats wherever you want — giving you completely free patterns.

Motif Placement

Icon	Function	Description
Scale / move / transform	Mode for adjusting the position, size and rotation of inserted SVG motifs and images	This mode activates automatically right after you insert a motif; drag the corner handles to change size and rotation.
Reset placement	Returns the motif's position, size and rotation to their initial values	Only appears when a motif has been inserted.

Shape Drawing

Icon	Function	How to use
Select	The default mode for selecting and editing slats and shapes	Click a slat to change its color or delete it; click a shape to move, resize or rotate it.
Draw circle	Adds a circle to the canvas	Click where you want it and the circle is placed.
Draw line	Adds a straight line to the canvas	Click the start point, then the end point, and the line is drawn.
Draw rectangle	Adds a rectangle to the canvas	Click where you want it and the rectangle is placed.
Add text	Adds a text label to the canvas	Click where you want it and a text input appears.
Delete all shapes	Removes every circle, line, rectangle and text you added	Does not affect your lattice slat edits.

Shapes are drawn on an overlay layer, separate from the lattice itself. They are meant for annotations and notes — they are not included in production specification calculations such as dimension labels or the parts list.