android - How canvas.getClipBound works -

i want know internals of canvas.getclipbound method. please guide me building understanding.

for example: while drawing on canvas , zoomed , using clipbounds can scrolled x , y positions asking

int l = canvas.getclipbound().left; int t = canvas.getclipbound().top; 

i want know how works internally.

suppose canvas has width , height 480x800 , have drawn on it. once zoom it, android system calculate how area of current canvas can shown user particular zoom level, , area clipped. example, actual displayable area of canvas once zoomed 300x500, clip area same 300x500, means, 300x500 zoomed , shown in 480x800 display. in example, rest of area ( width & height) of original canvas not displaying can calculated

xscroll = 480-300; 

and

yscroll = 800-500; 

canvas.getclipbound().left; gives how zoomed screen scrolled horizontally , canvas.getclipbound().top; shows how scrolled vertically.

hope you.