Head first C # Chinese Version chapter 13th controls and graphics page601

Graphics can solve our transparency problems

You may have come up with drawimage.
() Method is the key to solving overlapping issues. Let's solve the problem!

①
Add a drawbee
() Method, which is used to use any
Graphics
Object To draw a bee. It uses
Drawimage
() Method, which accepts
Rectangle
To define where to draw and its size.

②
Below is the new click of the form
Event processor. It draws the upper left corner of the beehive outside the form and places it in (
-Width
,
-Height
). And
Drawbee
() Method to draw four bees.

③
... But there is a problem.

When you drag the form out of the screen and then drag it back, the image disappears! Return to the original "nectar here"
"Program, the same problem!

What do you think is wrong?