size 300,300
xrange -5,5
yrange -5,5
grid 1,1,grey
linewidth 3
fillcolor orange
strokecolor blue
slider 0,2*pi,300,30,x,move arrow
arrow 0,0,4.5,0,8,red
opacity 200,100
frect -4,4,1,-1,blue
killslider
frect -4,4,1,-1,blue
display x,red,12
