Semantic Zooming and Child Glyphs. The image below comes from the Integrated Genome Browser, which can display a chromosome ideogram alongside the genome axis. A. At low zoom, component bands merge with parent bands and labels appear only when the display size in pixels is large enough to accommodate them. B. At high zoom, chromosome bands resolve and labels appear. Glyph classes that implement this behavior are in the igb subdirectories within the Genoviz project source code repository at sourceforge.net.