What Is the Join Curves Docker in CorelDRAW?

This article provides an overview of the Join Curves docker in CorelDRAW, a dedicated tool designed to connect open vector paths into continuous lines or closed objects. You will learn what the docker does, the different connection methods it offers, how gap tolerance works, and why this feature is critical for preparing artwork for fills, digital printing, and CNC production.

The Join Curves docker (accessible via Window > Dockers > Join Curves or Object > Join Curves) is a specialized utility that automates the process of connecting separate, open line segments. When drawing manually, importing CAD files, or converting bitmaps to vectors via PowerTRACE, artwork often contains tiny gaps between endpoints. The Join Curves docker eliminates the need to manually snap nodes together by automatically bridging these gaps based on specified parameters.

Connection Methods

The docker provides four distinct methods to join open endpoints, allowing you to choose how the new connecting segment is shaped:

  • Extend: Extends the adjacent lines along their natural trajectory until they intersect, forming a sharp corner without introducing a new bridging segment.
  • Chamfer: Joins the two endpoints using a flat, straight line segment, creating a beveled edge between the original paths.
  • Fillet: Connects the endpoints using a rounded, circular arc, producing a smooth transition between the two paths.
  • Bezier Curve: Adds a smooth, adjustable curve between the nodes that conforms to the direction and curvature of the existing path segments.

Gap Tolerance

A critical setting within the docker is Gap Tolerance. This defines the maximum physical distance between two endpoints that CorelDRAW will evaluate for joining. If the distance between two nodes exceeds this value, CorelDRAW leaves them separate. Setting an appropriate tolerance prevents the software from accidentally connecting unrelated lines in complex, dense illustrations.

Practical Applications

The Join Curves docker is essential for several core design tasks:

  • Applying Fills: CorelDRAW requires closed paths to apply solid, gradient, or pattern fills consistently. Joining open segments ensures shapes can hold color properly.
  • CAD and DXF Cleanup: Imported technical drawings frequently consist of hundreds of unjoined line segments. The docker can process the entire selection simultaneously, converting loose lines into cohesive geometric shapes.
  • CNC and Laser Cutting: Cutting plotters, vinyl cutters, and laser engravers interpret open segments as separate toolpath commands. Merging these segments into continuous contours optimizes machine travel time and prevents cutting errors.