Chapter 3G.1, Problem 2SCP

Explanation of Solution

Given code:

//Create object for DrawingPanel

DrawingPanel panel= new DrawingPanel(200, 200) ;

panel.drawLine(50 , 20, 86, 35) ;

Error:

• The method “drawLine()” in the second line should be called on the “Graphics” object “g” and not on the object of “DrawingPanel”.
• The order of parameters on the “drawLine()” method is incorrect.

 Corrected code:

//Create object for DrawingPanel

DrawingPanel panel = new DrawingPanel(200, 200);

//Assign the graphics context returned from getGraphics()

Graphics g = panel...