The following video (recorded at slow speed),shows an example of a radial hero animation. At the start, arow of three circular images appears at the bottom of the route.Tapping any of the circular images flies that image to a new routethat displays it with a square shape.Tapping the square image flies the hero back tothe original route, displayed with a circular shape.
Before moving to the sections specific tostandardor radial hero animations,read basic structure of a hero animationto learn how to structure hero animation code,and behind the scenes to understandhow Flutter performs a hero animation.
Flying a hero from one route to another as it transformsfrom a circular shape to a rectangular shape is a slickeffect that you can implement using Hero widgets.To accomplish this, the code animates the intersection oftwo clip shapes: a circle and a square.Throughout the animation, the circle clip (and the image)scales from minRadius to maxRadius, while the squareclip maintains constant size. At the same time,the image flies from its position in the source route to itsposition in the destination route. For visual examplesof this transition, see Radial transformationin the Material motion spec.
Pro tip: The radial hero animation involves intersecting a round shape with a square shape. This can be hard to see, even when slowing the animation with timeDilation, so you might consider enabling the debugPaintSizeEnabled flag during development.
late 14c., \"man of superhuman strength or physical courage,\" from Old French heroe (14c., Modern French héros), from Latin heros (plural heroes) \"hero, demi-god, illustrious man,\" from Greek hērōs (plural hērōes) \"demi-god,\" a variant singular of which was hērōe. This is of uncertain origin; perhaps originally \"defender, protector\" and from PIE root *ser- (1) \"to protect,\" but Beekes writes that it is \"Probably a Pre-Greek word.\"
1955, the New York City term for a sandwich elsewhere called submarine, grinder, poor boy (New Orleans), or hoagie (Philadelphia); origin unknown, perhaps so called for its great size (from hero (n.1)), or a folk-etymology alteration of Greek gyro as a type of sandwich.
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