InflatePaths

_{Home › clipper.h › InflatePaths}

InflatePaths

Paths64 InflatePaths(const Paths64& paths, double delta,
 JoinType join_type, EndType end_type,
 double miter_limit = 2.0, double arc_tolerance = 0.0);
PathsD InflatePaths(const PathsD& paths, double delta,
 JoinType join_type, EndType end_type, double miter_limit = 2.0,
 int precision = 2, double arc_tolerance = 0.0);

These functions encapsulate most of the features of ClipperOffset, the class that performs both polygon and open path offsetting. (And it's important to understand the notes pertaining to offsetting too.)

Parameter	Explanation
paths	A Paths64 or PathsD object that is to undergo offsetting.
delta	The amount paths are to be offset.
joinType	See JoinType.
endType	See EndType.
miterLimit	See ClipperOffset.MiterLimit.
precision	The number of decimal places of precision to consider when paths is type PathsD. (Maximum is 8 decimal places)
arcTolerance	See ClipperOffset.ArcTolerance.

#include "clipper2/clipper.h"  
...
using namespace Clipper2Lib;

int main()
{
  PathsD polyline, solution;
  polyline.push_back(MakePathD({100,100, 1500,100, 100,1500, 1500,1500}));
  // offset polyline
  solution = InflatePaths(polyline, 200, JoinType::Miter, EndType::Square);

  //draw polyline and inflated solution
}

#include "clipper2/clipper.h"  
...
using namespace Clipper2Lib;

int main()
{
  PathsD polygon, solution; 
  // add outer polygon contour
  polygon.push_back(Ellipse(RectD(100, 100, 1500, 1500)));
  // add inner "hole" contour
  PathD p = Ellipse(RectD(400, 400, 1200, 1200));
  std::reverse(p.begin(), p.end());
  polygon.push_back(p);

  // offset polygon
  solution = InflatePaths(polygon, 100, JoinType::Round, EndType::Polygon);

  //draw polygon and inflated solution
}

See Also

ClipperOffset, ClipperOffset.ArcTolerance, ClipperOffset.MiterLimit, EndType, JoinType, Paths64, PathsD