A line drawing program

Document your code using javadoc

Consider the task of creating a Java program that will allow the user to create line drawings. Here is a start for such a program. Download the program and examine it carefully. It allows users to draw lines on the yellow panel.

• Lines are drawn on the drawingPanel by:
  1. pressing the left mouse button down;
  2. then dragging the mouse while keeping the left mouse button pressed,
  3. and releasing it. A line is drawn from the point where the mouse button was initially pressed to the point where the mouse was released. The current state of the line is always visible.
• Minimizing (or occluding) the window causes the lines to disappear. Why? Modify the code so that the lines are visible even after the window has been occluded.
1. How would you solve this problem for one line?
2. How would you extend the solution to many lines?
• Selecting File-New should erase all the lines. Add this functionality to your code.
• A left mouse click on a line while holding down the shift key must delete the line.
1. Develop an algorithm to identify which line was clicked.
2. Add this functionality to your code.