Learn/Drafting/2D Sketch Editor
Modify Tools
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
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.
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.