Modify Tools

Updated v2.5.0

At a glance

Trim — cut lines and arcs at intersections
Extend — stretch a line or arc to meet another entity
Offset — offset an entire chain or polyline by a signed distance
Fillet — insert a fillet arc between two entities, or fillet all corners at once
Chamfer — insert a chamfer line between two lines or arcs
Mirror — mirror selection about a two-point axis
Move, Rotate, Scale — standard transforms on any selection
Pattern — circular or rectangular array of selected entities, with a preview that matches the committed result exactly
Simplify — thin a dense polyline to a tolerance, keeping arcs as arcs
Smooth — redraw a faceted polyline as a flowing curve through every original point

The modify tools reshape geometry you've already drawn. Most work from the current selection — select first, then hit the tool's key — and all of them keep arcs as true arcs and preserve each entity's layer, color, and construction flag through the operation.

Trim and Extend

Trim (T) is hover-and-click: the segment between intersections under your cursor highlights red, and clicking deletes exactly that piece, splitting the original line, arc, or circle into the remaining sub-entities. Extend (E) is one-shot: select two entities and it grows whichever ends fall short of their mutual intersection. If both fall short, both grow to meet — the fastest way to un-fillet a corner: delete the arc, select the two stubs, press E, and the sharp corner is back.

Offset, Fillet, Chamfer

Offset (O) takes a chain-selected profile (Space) or a polyline and offsets it by a signed distance — positive is outside a closed loop, negative inside — with a live preview as you type. Large offsets that split the shape or create islands come out as multiple chains, correctly. Fillet (F) rounds the shared corner of any two lines/arcs; hand it a closed chain and it fillets every sharp corner in one pass. Each fillet arrives fully constrained — tangent, coincident, with an editable radius dimension. Chamfer offers four definitions: Face Length, Equal Legs, Two Distances, and Distance + Angle.

Simplify and Smooth

Two opposite cleanups for polylines that arrived dense or faceted — traced images, imported DXF art, converted splines. Simplify (Y) removes vertices: it thins the selection to a tolerance, keeps arc segments as true arcs, and the result is a subset of the points you already had. Smooth adds vertices: it runs the polyline onto a continuous curve that passes through every original point and re-draws it at an even spacing — nothing drifts and no corner rounds off; the flat chords between your points become curve. Both tools work from the current selection (right-click → Simplify… / Smooth… also works), show gray dots on the original vertices with a live cyan preview, update as you type the tolerance or spacing, and remember your last-used value.

Transforms and patterns

Move (M) translates by two picked points; Rotate picks center, reference, and destination — or Tab in an exact angle; Scale applies a uniform factor about a picked point; Mirror reflects across a two-point axis, keeping the originals. Pattern arrays the selection either circularly (center point, step angle, count) or rectangularly (X/Y spacing and counts), with a live preview before you commit — and it remembers your last-used values. The preview draws exactly what Finish will create: closed profiles preview closed, arc segments preview as arcs, and splines and construction points pattern like any other entity.

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