reverseContourPen
- class fontTools.pens.reverseContourPen.ReverseContourPen(outPen, outputImpliedClosingLine=False)[source]
Filter pen that passes outline data to another pen, but reversing the winding direction of all contours. Components are simply passed through unchanged.
Closed contours are reversed in such a way that the first point remains the first point.
- addComponent(glyphName, transformation, **kwargs)
Add a sub glyph. The ‘transformation’ argument must be a 6-tuple containing an affine transformation, or a Transform object from the fontTools.misc.transform module. More precisely: it should be a sequence containing 6 numbers.
- closePath()
Close the current sub path. You must call either pen.closePath() or pen.endPath() after each sub path.
- curveTo(*points)
Draw a cubic bezier with an arbitrary number of control points.
The last point specified is on-curve, all others are off-curve (control) points. If the number of control points is > 2, the segment is split into multiple bezier segments. This works like this:
Let n be the number of control points (which is the number of arguments to this call minus 1). If n==2, a plain vanilla cubic bezier is drawn. If n==1, we fall back to a quadratic segment and if n==0 we draw a straight line. It gets interesting when n>2: n-1 PostScript-style cubic segments will be drawn as if it were one curve. See decomposeSuperBezierSegment().
The conversion algorithm used for n>2 is inspired by NURB splines, and is conceptually equivalent to the TrueType “implied points” principle. See also decomposeQuadraticSegment().
- endPath()
End the current sub path, but don’t close it. You must call either pen.closePath() or pen.endPath() after each sub path.
- filterContour(contour)[source]
Subclasses must override this to perform the filtering.
The contour is a list of pen (operator, operands) tuples. Operators are strings corresponding to the AbstractPen methods: “moveTo”, “lineTo”, “curveTo”, “qCurveTo”, “closePath” and “endPath”. The operands are the positional arguments that are passed to each method.
If the method doesn’t return a value (i.e. returns None), it’s assumed that the argument was modified in-place. Otherwise, the return value is drawn with the output pen.
- lineTo(p1)
Draw a straight line from the current point to ‘pt’.
- moveTo(p0)
Begin a new sub path, set the current point to ‘pt’. You must end each sub path with a call to pen.closePath() or pen.endPath().
- qCurveTo(*points)
Draw a whole string of quadratic curve segments.
The last point specified is on-curve, all others are off-curve points.
This method implements TrueType-style curves, breaking up curves using ‘implied points’: between each two consequtive off-curve points, there is one implied point exactly in the middle between them. See also decomposeQuadraticSegment().
The last argument (normally the on-curve point) may be None. This is to support contours that have NO on-curve points (a rarely seen feature of TrueType outlines).
- replay(pen)