how do i clear all the shapes i've drawn on a panel using the graphics2d object?

Posted on 2011-02-20
Last Modified: 2012-05-11
how do i clear all the shapes i've drawn on a panel using the graphics2d object?
Question by:wrynn
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 47

Expert Comment

ID: 34940172
You can say clear Rect over the whole compouonent
LVL 47

Accepted Solution

for_yan earned 333 total points
ID: 34940178
g2d.clearRect(0,0,this.getWidth(), this.getHeight()) should work
LVL 92

Assisted Solution

objects earned 167 total points
ID: 34940229
typically you don't clear. for example each time the paintComponent() method of a JComponent is called the 'canvas' is already blank.
PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

LVL 47

Assisted Solution

for_yan earned 333 total points
ID: 34940446
I guess in order to claer your component in the class where you have
paint method you set up a boolean value, say,
and then  
you just say

  and in you paint(Graphics g) method first thing
you check this boolean
 and return if it is set:


  Then if you need to blank your component, you
just say:


and it  should clean the panel or canvas for you


Author Comment

ID: 36156857
I figured out that I had to draw a white rectangle over the entire screen at the beginning of my paint method.
LVL 27

Expert Comment

ID: 37645653
I've requested that this question be closed as follows:

Accepted answer: 0 points for wrynn's comment #36156857

for the following reason:

This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
LVL 47

Expert Comment

ID: 37645654
I think three comments should be considered to be a solution
ID: 34940178 (166 points)
ID: 34940229 (166 points)
ID: 34940446 (166 points)

Any one of these can be considered as an accepted solution, the other two
are assisted solution

The comment by wrynn  ID: 36156857
in fact repeats the solution which was mentioned above
LVL 27

Expert Comment

ID: 37646676
Fine with giving points to experts.  The solution used by the asker is not the same as the suggestions by for_yan, hence the original assignment to the asker.  But experts worked at it, so giving points to them is fine.  The first answer from objects is the correct one, but not what the asker used, so hard to say here.

Featured Post

What Is Transaction Monitoring and who needs it?

Synthetic Transaction Monitoring that you need for the day to day, which ensures your business website keeps running optimally, and that there is no downtime to impact your customer experience.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers learn how to read error messages and identify possible mistakes that could cause hours of frustration. Coding is as much about debugging your code as it is about writing it. Define Error Message: Line Numbers: Type of Error: Break Down…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…

695 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question