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LwPolyline mirrored transform case handling #1007

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LwPolyline mirrored transform case handling #1007

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23 changes: 19 additions & 4 deletions src/ACadSharp/Entities/LwPolyLine.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -123,12 +123,27 @@ public override void ApplyTransform(Transform transform)

this.getWorldMatrix(transform, this.Normal, newNormal, out Matrix3 transOW, out Matrix3 transWO);

var m = transform.Matrix;
double det =
m.M00 * m.M11 -
m.M01 * m.M10;

bool mirrored = det < 0;

foreach (var vertex in this.Vertices)
{
XYZ v = transOW * vertex.Location.Convert<XYZ>();
v = transform.ApplyTransform(v);
v = transWO * v;
vertex.Location = v.Convert<XY>();
// OCS → WCS
XYZ transformationVector = transOW * vertex.Location.Convert<XYZ>();
transformationVector = transform.ApplyTransform(transformationVector);

// WCS → new OCS
transformationVector = transWO * transformationVector;
vertex.Location = transformationVector.Convert<XY>();

if (mirrored && vertex.Bulge != 0.0)
{
vertex.Bulge = -vertex.Bulge;
}
}

this.Normal = newNormal;
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