How can animate a ball rotating 180 degrees like a half circle?

[Ramon]

Some of them:

MIT App Inventor Gallery

Make an Analog Gauge and use it to display something useful

Make a simple Canvas based gauge and display your altitude. A simple home made gauge: uses two png images, a Canvas and an ImageSprite and a LocationSensor/GPS to provide elevation information [Altimeter2examle] The Gauge face is an image set to the background of a Canvas. An ImageSprite is the pointer. Make the pointer with a transparent background as a png image. I am not a graphic artist; use your graphic skills to provide a more elaborate image. The GPS Altitude value is used in a…

App inventor Gráficos estadísticos con Google Chart. Tarta. Líneas. Barras. Pie. Bars. Line. (kio4.com)