anxious! !! !! Show a changing circle

ywh828

Write a program, a solid circle with the center of the circle moving along a sine curve trajectory appears on the screen, and the fill color of the circle and the surrounding color of the circle change every quarter period, and the radius of the circle is at four Within one cycle, it increases linearly from 0.2 times to 0.6 times the amplitude of the sine curve.
thank you! !! !!

rsq666

GDI + has a function for drawing a circle on the inside, which is mainly to find the trajectory of the center of the circle.

dai87331

Mark