PPT Slide

0. Obtain the initial position (X,Y)

1. Read current position (A,B)

2. Draw horizontal line from

(X,Y) to (A,Y) and store it

3. Draw vertical line from

(A,Y) to (A,B) and store it

4. Draw horizontal line from

(A,B) to (X,B) and store it

5. Draw vertical line from

(X,B) to (X,Y) and store it

6. If the mouse button is still pressed, erase

the video RAM and repeat from step 1

Image Creation:

Drawing a Rectangle

X, Y

A, Y

X, B

A, B

step 1

step 0

step 2

step 3

step 4

step 5

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