Need help with fillArc()

**dunnkers** · February 2nd, 2011, 10:05 AM

I want to create some sort of progress circle like this:
(I made these in paint, not in java)

25%

75%

How would i do this with fillArc()?

What i already have:
I draw the background:

		g.drawOval(0, 0, 100, 100);

I can fill half the oval:

		g.fillArc(0, 0, 100, 100, 0, -180);

How fillArc works:
fillArc(x, y, width, height, startAngle, angle);
- 3 o'clock is 0°
- positive values go clockwise, negative values go counter clockwise

Thanks, Dunnkers.

**copeg** · February 2nd, 2011, 10:33 AM

1) Fill a complete oval
2) Fill a rectangle (color set to background) covering the percentage of the oval you wish to cover based upon progress.
3) Stroke the oval

**KevinWorkman** · February 2nd, 2011, 10:34 AM

This thread has been cross posted here:

http://www.java-forums.org/java-2d/38258-need-help-fillarc.html

Although cross posting is allowed, for everyone's benefit, please read:

Java Programming Forums Cross Posting Rules

The Problems With Cross Posting

**dunnkers** · February 2nd, 2011, 10:54 AM

Originally Posted by copeg

1) Fill a complete oval
2) Fill a rectangle (color set to background) covering the percentage of the oval you wish to cover based upon progress.
3) Stroke the oval

How would i stroke the oval?
Let's say the percentage is 25%

Thanks for your reply

Originally Posted by KevinWorkman

This thread has been cross posted here:

http://www.java-forums.org/java-2d/38258-need-help-fillarc.html

Although cross posting is allowed, for everyone's benefit, please read:

Java Programming Forums Cross Posting Rules

The Problems With Cross Posting

Sorry for the crosspost.

**copeg** · February 2nd, 2011, 10:57 AM

How would i stroke the oval?

Read the API for Graphics, in particular the *Oval methods

**dunnkers** · February 2nd, 2011, 11:17 AM

I still have no idea how i would do this, could someone give me an example?

**copeg** · February 2nd, 2011, 12:15 PM

Originally Posted by dunnkers

I still have no idea how i would do this, could someone give me an example?

I gave you step by step instructions above...you have to tell us what exactly you don't understand about them for anyone to help you further, or better yet give it a try, read the API for Graphics and look for useful methods, and post some code demonstrating what you've attempted and what the problem is.

**dunnkers** · February 2nd, 2011, 12:44 PM

Originally Posted by copeg

I gave you step by step instructions above...you have to tell us what exactly you don't understand about them for anyone to help you further, or better yet give it a try, read the API for Graphics and look for useful methods, and post some code demonstrating what you've attempted and what the problem is.

Okay, sorry for my un-constructive post.

What i managed to do:
(The picture is taken from a java applet)

				int x = 10, y = 10;
				int width = 100, height = 100;
 
				g.setColor(Color.BLACK);
				g.drawRect(x, y, width, height);
 
				g.setColor(setAlpha(Color.RED, 150));
				g.fillOval(x, y, width, height);
 
				//the calculations of the arc start here
				int x_ = (int) (x+((width*0.25)/2));
				int y_ = y+height_;
				int width_ = width-((x_-x)*2);
				int height_ = (int) (height*(0.25*2));
 
				g.setColor(Color.BLACK);
				g.drawRect(x_, y_, width_, height_);
 
				g.setColor(setAlpha(Color.GREEN, 150));
				g.fillArc(x_, y_, width_, height_, 0, -180);

The problem: It doesn't yet fit perfectly. The missing calculation. I don't how.

**dunnkers** · February 2nd, 2011, 01:01 PM

I crossposted this on yet another forum, (i really needed an answer) and the answer has been found.
Link: Need help with fillArc()

**copeg** · February 2nd, 2011, 01:14 PM

Originally Posted by dunnkers

I crossposted this on yet another forum, (i really needed an answer) and the answer has been found.
Link: Need help with fillArc()

Well then, good for you that you found an answer, bad for you that you were spoonfed, and bad for me that I wasted my time trying to help you. Thanks for that. Perhaps you should read: The problems with crossposting...and for what its worth, that solution is beyond overkill

**dunnkers** · February 2nd, 2011, 01:21 PM

I read and i understand now. I will not crosspost anymore.
I thought i'd get an answer sooner, but actually the time explaining mutliple people the same problem, cost me more time.

Thanks for your help though, copeg.

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