Introduction - If you have any usage issues, please Google them yourself
This is my exercises.* Draw simple graphics, such as a straight line, oval, rectangular, etc * to set the brush color, width, alignment and so on, can also set the background color * Save and open files, open the can choose when to open and direct single-step to open * Undo and restore function program also joined the scroll bar, mainly for previous knowledge integration into, at the same time adding to the difficulties.