Inkscape hatch fill extension

This Inkscape extension performs the classic hatch and crosshatch fill operations on selected closed objects and closed paths in an Inkscape drawing. Should nothing be selected, then every closed path and closed object in the document is hatch filled. The orientation and spacing of the hatch fill is user selectable as is whether or not to draw hatches or crosshatches.

The extension works by computing the points of intersection between a hatch or crosshatch grid with the selected closed objects or paths. An odd/even rule is then applied to determine which segments of the hatches or crosshatches to retain: for a given hatch line, its first intersection is considered to be the hatch line entering a closed figure, the second intersection it leaving, the third it entering another object (or section of an object), and so on. While this algorithm works well in most cases, one fault with it occurs when a hatch line intersects the corner of an object. In some circumstances this can appe