center method
Implementation
GenericGlyph center(int ascender, int descender, int offset) {
final metrics = this.metrics;
final offsetX = -metrics.xMin;
final offsetY =
(ascender + descender) / 2 - metrics.height / 2 - metrics.yMin + offset;
final newOutlines = outlines.map((o) {
final newOutline = o.copy();
final newPointList = newOutline.pointList
.map((e) => math.Point<num>(e.x + offsetX, e.y + offsetY))
.toList();
newOutline.pointList
..clear()
..addAll(newPointList);
return newOutline;
}).toList();
final newBounds = math.Rectangle(
bounds.left + offsetX,
bounds.bottom + offsetY,
bounds.width,
bounds.height,
);
return GenericGlyph(newOutlines, newBounds, metadata);
}