Fancy Bow is a texture pack for bedrock edition it tells you when the bow is fully charged and can get the most range and damage. You can tell if it is full by seeing the colour change in the centre of the bow a no charge bow will have a dark red colour ,a low charge bow will have a lighter red colour , a mid charge bow will be orange and yellow colour, and full charged bow will be green (the function for being useful for colour blind people will be added in later versions.).