draw image legend of area
eimgleg(x,y,width,height,map,scale,orientation)
x :
sw-x position of area
y :
sw-y position of area
width :
width of area
height :
height of area
map :
map of legend
scale :
scale vector of legend [start step end]
special cases of scale vector are
if start=0 and end=0 then autorange=on
if step=0 then autoscale=on
orientation :
side of the area where the legend appears
character ‘s’(south),’n’(north),’w’(west) or ‘e’(east)