How to offset polyline entity use ECMAScript ?

[vn38minhtran]

Code: Select all

  var entity = [any entity];
  var pos = [any pos];
  var shape = entity.getClosestSimpleShape(pos);
  if(!isLineBasedShape(shape) && !isArcShape(shape) && !isCircleShape(shape) && !isEllipseShape(shape)){
    print('Shape don\'t support.');
  }
  var offsetShapes = ShapeAlgorithms.getOffsetShapes(shape, distance, 1, pos);
  for (var i=0; i<offsetShapes.length; ++i) {
    var offsetShapeEntity;
    if(isLineBasedShape(offsetShapes[i])){
      offsetShapeEntity = new RLineEntity(document, new RLineData(offsetShapes[i].getStartPoint(), offsetShapes[i].getEndPoint()));
    }else{
      offsetShapeEntity = shapeToEntity(document, offsetShapes[i]);
    }
    if (!isNull(offsetShapeEntity)) {
      op.addObject(offsetShapeEntity);
    }
  }
  op.apply(document);

With code above polyline entity don't offset correct.

[andrew]

ShapeAlgorithms.getOffsetShapes only supports lines, arcs and ellipses.

If you are using QCAD Professional, you can use the OffsetProWorker API to offset polylines (the QCAD Community Edition does not support polyline offsets):

include("scripts/Pro/Modify/OffsetPro/OffsetProWorker.js");

...

/**
 * \param oriShape Original polyline shape
 * \param oriSegment Segment of the original polyline that was clicked by the user (used to determine offset direction)
 * \param distance Distance to offset
 * \param number Number of offset polylines to create, each with a distance of distance * n
 * \param pos Position that was clicked by the user (used to determine offset direction)
 * \param forceInside Force offset direction for closed polylines: true: inside, false: outside, undefined: determined by pos
 * \param joinType RS.JoinBevel, RS.JoinRound, RS.JoinMiter
 * \param endType RS.EndClosedPolygon, RS.EndClosedLine, RS.EndOpenButt, RS.EndOpenSquare, RS.EndOpenRound, RS.EndOpenSingle
 * \param interpolateArcs True to interpolate arcs with line segments (more reliable offset result, but more segments)
 * \param verify True to verify result, print errors through EAction.handleUserWarning
 * \param preview True to return preview for offset.
 */
var worker = new OffsetProWorker(oriShape, oriSegment, distance, number, pos, forceInside, joinType, endType, interpolateArcs, verify, preview);
var polylines = worker.getOffsetShapes();

[CVH]

Outdated info, see: https://www.qcad.org/rsforum/viewtopic. ... 553#p15553

Regards,
CVH