7/3/2023 0 Comments Fontforge join points""" curve = # keep track of our prefixes codes = verts = state = _State. ‘B’ and ‘BO’ are best though of as prefixes in the sense that the on-point status of the next point processed will determine some action.ĭef _quadratic_verts_codes ( pts ): """ Extract the components of a from a list of (x,y) coordinates.‘-’ indicates the initial start state where the first point processed in an on-point curve, the one we assumed to exist earlier.In Figure 2, ‘B’ indicates a blue, on-point coordinate whereas ‘O’ is an orange, not on-point coordinate. Here ‘B’ indicates a blue, on-point coordinate ‘O’ an orange, not on-point coordinate. If we assume that there is always at least one blue point that is, one on-curve point, we can loop through the points using the following state diagram: Figure 2: the quadratic spline state diagram. The first case is relatively simple and, as Google’s material icons rely on quadratic splines, we focus only on the second case. (This should be familiar to anyone who has read the truetype ‘glyf’ table docs). However if there are two adjacent off-curve points then an on-curve point will be interpolated between them. Two on-curve points with an off-curve point between them yields a quadratic bezier curve. Again, two adjacent on-curve points yield a line between those points. If based on quadratic splines things are more complex. If there are 2 off-curve points we have a cubic bezier curve between the two end points. If there are no off-curve points then we have a line between those two points. If based on cubic splines there should be either 0 or 2 off-curve points between every two on-curve points. The FontForge documentation specifies two scenarios. In the FontForge vernacular, blue points are termed “on-curve”, while orange points are intended to be used as spline knots.Ī bit more should be said about the orange points. There are three simple polygons, in blue, where ‘simple’ indicates that there are no self-intersections.ĭefining these polygons are two classes of points, blue and orange. There are a few features to note in Figure 1. Figure 1: the codepoint U+E050 from Google’s material icons. In Figure 1, we show an example codepoint taken from Google’s material icons font. In particular, FontForge provides an object model for character glyphs, and this section provides a walkthrough of how to extract the internal polygonal data and reproduce the glyphs in Matplotlib. FontForge exposes a Python later that does far deeper than the copy and paste example above.
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