// *
// * Applies a "thickness" to a shape, ie a bit like the extruder, but in 2D
// * <table border="0" width="100%"><tr><td>\image html shape_thick1.png "Start shape (before thicken)"</td><td>\image html shape_thick2.png "Result (after thicken)"</td></tr></table>
//
//-----------------------------------------------------------------------
public MultiShape thicken(float amount) {
if (!mClosed) {
Shape s = new Shape();
s.setOutSide(mOutSide);
for (int i = 0; i < mPoints.Count; i++)
s.addPoint(mPoints[i] + amount * getAvgNormal((uint)i));
for (int i = mPoints.Count - 1; i >= 0; i--)
s.addPoint(mPoints[i] - amount * getAvgNormal((uint)i));
s.close();
return new MultiShape().addShape(s);
}
else {
MultiShape ms = new MultiShape();
Shape s1 = new Shape();
for (int i = 0; i < mPoints.Count; i++)
s1.addPoint(mPoints[i] + amount * getAvgNormal((uint)i));
s1.close();
s1.setOutSide(mOutSide);
ms.addShape(s1);
Shape s2 = new Shape();
for (int i = 0; i < mPoints.Count; i++)
s2.addPoint(mPoints[i] - amount * getAvgNormal((uint)i));
s2.close();
s2.setOutSide(mOutSide == Side.SIDE_LEFT ? Side.SIDE_RIGHT : Side.SIDE_LEFT);
ms.addShape(s2);
return ms;
}
}
/// Extracts a part of the shape as a new shape
/// @param first first index to be in the new shape
/// @param last last index to be in the new shape
public Shape extractSubShape(uint first, uint last) {
Shape s = new Shape();
for (int i = (int)first; i <= last; i++)
s.addPoint(mPoints[i]);
s.setOutSide(mOutSide);
if (mClosed)
s.close();
return s;
}