Re: [JAVA2D] drawString() on Graphics2D question
Clarification: > Another alternative (preferable to creating a Shape, I think) is > to render the string into an Image, and then rotate the image. As well as the string itself an image will carry the background with it so this is probably not the best way to go for most people. You can create an image with a transparent background and render the text to it. When you copy the image, only the text pixels will be copied. There's sample code for doing just this in the Intermediate Images article on java.sun.com. And except for quadrant rotations I would not expect great results. Not sure what this means - rendering the string to an image and then copying the image to the screen (or back buffer) should give you exactly the same results as rendering the string directly to the screen/back-buffer. Rotating the image may give you different results than rotating the string, but if you take the "better yet" suggestion for pre-rotating the string into the image, then the results should be exactly the same. But I agree that this is really only a workaround for current lack of acceleration for this operation; we hope to handle all of this implicitly in future releases. Chet. Rotate the graphics and draw the text along the lines of a previous poster is the most straightforward solution and that will get accelerated too in the future and is fairly snappy even in software. As for measuring the text, there are many APIs for this - too many! But the only one that is trying to be "pixel perfect" is java.awt.font.GlyphVector.getPixelBounds() which is however consequently expensive and won't work for complex text. Try to use something like java.awt.font.TextLayout.getBounds() for that - its not going to be as pixel perfect but will work for complex text. You may even be able to get away with java.awt.font.GlyphVector.getVisualBounds() if you don't use complex text. Did I mention there are a lot of APIS for this? In fact I probably still missed one .. -phil. Chet Haase wrote: Another alternative (preferable to creating a Shape, I think) is to render the string into an Image, and then rotate the image. Or better yet: render the rorate string into the image, and then just copy the image (no transform involved). This approach is not worth the hassle if you are constantly changing the string orientation, or if you are only rendering it once. Butif you are constantly rendering the same string at the same orientation, then it might be worth the hassle/ memory-footprint tradeoff to get a performance boost from doing a simple image copy instead of a transformed text operation. Worth mentioning as an option, anyway. Chet. Alexey Ushakov wrote: I think that first approach is more preferable. Shape of the string is just outline of the string. It does not contain all necessary information (like hinting for example) for drawing string. This could affect quality especially in case of strings of small sizes. Though, such approach could be used with strings of large sizes for performance reason. Alexey On Tue, Mar 22, 2005 at 10:32:27AM -0500, Nidel, Mike wrote: The answer to your first question is relatively simple: Before you draw the string, you can do a transform() on the Graphics2D. You pass in an AffineTransform that you create with AffineTransform.getRotateInstance(theta). Alternatively you can convert the string to a Shape and perform a rotation on the Shape itself. As for your second question, I don't think I can help you there. This information will change depending on whether you're using anti-aliasing or not. You may be able to convert your string into a Shape and do some kind of operation to iterate over all of the pixels in the shape... but I'm not sure. Mike -Original Message- From: Discussion list for Java 2D API [mailto:[EMAIL PROTECTED] Behalf Of Sven Mielordt Sent: Tuesday, March 22, 2005 10:21 AM To: [EMAIL PROTECTED] Subject: [JAVA2D] drawString() on Graphics2D question Hi fellows, I have a short question concerning drawString() on Graphics2D. When using it, the string is printed horizontally. But how can I print text vertically or at arbitrary angles??? A refining question concerns the number of pixels needed for the string. Is there any method to find out how many pixels in all directions will be occupied? Thank you, Sven __ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193 == = To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL
Re: [JAVA2D] drawString() on Graphics2D question
Time for a few quick comments >>> Alternatively you can convert the string to a Shape and perform you will get worse looking text this way. It will also be much slower. > Another alternative (preferable to creating a Shape, I think) is > to render the string into an Image, and then rotate the image. As well as the string itself an image will carry the background with it so this is probably not the best way to go for most people. And except for quadrant rotations I would not expect great results. Rotate the graphics and draw the text along the lines of a previous poster is the most straightforward solution and that will get accelerated too in the future and is fairly snappy even in software. As for measuring the text, there are many APIs for this - too many! But the only one that is trying to be "pixel perfect" is java.awt.font.GlyphVector.getPixelBounds() which is however consequently expensive and won't work for complex text. Try to use something like java.awt.font.TextLayout.getBounds() for that - its not going to be as pixel perfect but will work for complex text. You may even be able to get away with java.awt.font.GlyphVector.getVisualBounds() if you don't use complex text. Did I mention there are a lot of APIS for this? In fact I probably still missed one .. -phil. Chet Haase wrote: Another alternative (preferable to creating a Shape, I think) is to render the string into an Image, and then rotate the image. Or better yet: render the rorate string into the image, and then just copy the image (no transform involved). This approach is not worth the hassle if you are constantly changing the string orientation, or if you are only rendering it once. Butif you are constantly rendering the same string at the same orientation, then it might be worth the hassle/ memory-footprint tradeoff to get a performance boost from doing a simple image copy instead of a transformed text operation. Worth mentioning as an option, anyway. Chet. Alexey Ushakov wrote: I think that first approach is more preferable. Shape of the string is just outline of the string. It does not contain all necessary information (like hinting for example) for drawing string. This could affect quality especially in case of strings of small sizes. Though, such approach could be used with strings of large sizes for performance reason. Alexey On Tue, Mar 22, 2005 at 10:32:27AM -0500, Nidel, Mike wrote: The answer to your first question is relatively simple: Before you draw the string, you can do a transform() on the Graphics2D. You pass in an AffineTransform that you create with AffineTransform.getRotateInstance(theta). Alternatively you can convert the string to a Shape and perform a rotation on the Shape itself. As for your second question, I don't think I can help you there. This information will change depending on whether you're using anti-aliasing or not. You may be able to convert your string into a Shape and do some kind of operation to iterate over all of the pixels in the shape... but I'm not sure. Mike -Original Message- From: Discussion list for Java 2D API [mailto:[EMAIL PROTECTED] Behalf Of Sven Mielordt Sent: Tuesday, March 22, 2005 10:21 AM To: [EMAIL PROTECTED] Subject: [JAVA2D] drawString() on Graphics2D question Hi fellows, I have a short question concerning drawString() on Graphics2D. When using it, the string is printed horizontally. But how can I print text vertically or at arbitrary angles??? A refining question concerns the number of pixels needed for the string. Is there any method to find out how many pixels in all directions will be occupied? Thank you, Sven __ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193 == = To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". ===
Re: [JAVA2D] drawString() on Graphics2D question
Another alternative (preferable to creating a Shape, I think) is to render the string into an Image, and then rotate the image. Or better yet: render the rorate string into the image, and then just copy the image (no transform involved). This approach is not worth the hassle if you are constantly changing the string orientation, or if you are only rendering it once. Butif you are constantly rendering the same string at the same orientation, then it might be worth the hassle/ memory-footprint tradeoff to get a performance boost from doing a simple image copy instead of a transformed text operation. Worth mentioning as an option, anyway. Chet. Alexey Ushakov wrote: I think that first approach is more preferable. Shape of the string is just outline of the string. It does not contain all necessary information (like hinting for example) for drawing string. This could affect quality especially in case of strings of small sizes. Though, such approach could be used with strings of large sizes for performance reason. Alexey On Tue, Mar 22, 2005 at 10:32:27AM -0500, Nidel, Mike wrote: The answer to your first question is relatively simple: Before you draw the string, you can do a transform() on the Graphics2D. You pass in an AffineTransform that you create with AffineTransform.getRotateInstance(theta). Alternatively you can convert the string to a Shape and perform a rotation on the Shape itself. As for your second question, I don't think I can help you there. This information will change depending on whether you're using anti-aliasing or not. You may be able to convert your string into a Shape and do some kind of operation to iterate over all of the pixels in the shape... but I'm not sure. Mike -Original Message- From: Discussion list for Java 2D API [mailto:[EMAIL PROTECTED] Behalf Of Sven Mielordt Sent: Tuesday, March 22, 2005 10:21 AM To: [EMAIL PROTECTED] Subject: [JAVA2D] drawString() on Graphics2D question Hi fellows, I have a short question concerning drawString() on Graphics2D. When using it, the string is printed horizontally. But how can I print text vertically or at arbitrary angles??? A refining question concerns the number of pixels needed for the string. Is there any method to find out how many pixels in all directions will be occupied? Thank you, Sven __ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193 == = To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] drawString() on Graphics2D question
I think that first approach is more preferable. Shape of the string is just outline of the string. It does not contain all necessary information (like hinting for example) for drawing string. This could affect quality especially in case of strings of small sizes. Though, such approach could be used with strings of large sizes for performance reason. Alexey On Tue, Mar 22, 2005 at 10:32:27AM -0500, Nidel, Mike wrote: > The answer to your first question is relatively simple: > > Before you draw the string, you can do a transform() on the > Graphics2D. You pass in an AffineTransform that you create > with AffineTransform.getRotateInstance(theta). > > Alternatively you can convert the string to a Shape and perform > a rotation on the Shape itself. > > As for your second question, I don't think I can help you there. > This information will change depending on whether you're using > anti-aliasing or not. You may be able to convert your string > into a Shape and do some kind of operation to iterate over all of > the pixels in the shape... but I'm not sure. > > Mike > > > > -Original Message- > > From: Discussion list for Java 2D API > > [mailto:[EMAIL PROTECTED] Behalf Of Sven Mielordt > > Sent: Tuesday, March 22, 2005 10:21 AM > > To: [EMAIL PROTECTED] > > Subject: [JAVA2D] drawString() on Graphics2D question > > > > > > Hi fellows, > > > > I have a short question concerning drawString() on Graphics2D. > > When using it, the string is printed horizontally. > > But how can I print text vertically or at arbitrary angles??? > > > > A refining question concerns the number of pixels needed for > > the string. > > Is there any method to find out how many pixels in all > > directions will be occupied? > > > > Thank you, > > Sven > > __ > > Verschicken Sie romantische, coole und witzige Bilder per SMS! > > Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193 > > > > == > > = > > To unsubscribe, send email to [EMAIL PROTECTED] and > > include in the body > > of the message "signoff JAVA2D-INTEREST". For general help, > > send email to > > [EMAIL PROTECTED] and include in the body of the message "help". > > > > === > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff JAVA2D-INTEREST". For general help, send email to > [EMAIL PROTECTED] and include in the body of the message "help". === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] drawString() on Graphics2D question
The answer to your first question is relatively simple: Before you draw the string, you can do a transform() on the Graphics2D. You pass in an AffineTransform that you create with AffineTransform.getRotateInstance(theta). Alternatively you can convert the string to a Shape and perform a rotation on the Shape itself. As for your second question, I don't think I can help you there. This information will change depending on whether you're using anti-aliasing or not. You may be able to convert your string into a Shape and do some kind of operation to iterate over all of the pixels in the shape... but I'm not sure. Mike > -Original Message- > From: Discussion list for Java 2D API > [mailto:[EMAIL PROTECTED] Behalf Of Sven Mielordt > Sent: Tuesday, March 22, 2005 10:21 AM > To: [EMAIL PROTECTED] > Subject: [JAVA2D] drawString() on Graphics2D question > > > Hi fellows, > > I have a short question concerning drawString() on Graphics2D. > When using it, the string is printed horizontally. > But how can I print text vertically or at arbitrary angles??? > > A refining question concerns the number of pixels needed for > the string. > Is there any method to find out how many pixels in all > directions will be occupied? > > Thank you, > Sven > __ > Verschicken Sie romantische, coole und witzige Bilder per SMS! > Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193 > > == > = > To unsubscribe, send email to [EMAIL PROTECTED] and > include in the body > of the message "signoff JAVA2D-INTEREST". For general help, > send email to > [EMAIL PROTECTED] and include in the body of the message "help". > === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
Re: [JAVA2D] drawString() on Graphics2D question
Sven Mielordt wrote:
Hi fellows,
I have a short question concerning drawString() on Graphics2D.
When using it, the string is printed horizontally.
But how can I print text vertically or at arbitrary angles???
A refining question concerns the number of pixels needed for the string.
Is there any method to find out how many pixels in all directions will be
occupied?
Thank you,
Sven
_
Here is a utility method that I use for JFreeChart - it seems to work
pretty well:
/**
* A utility method for drawing rotated text.
*
* A common rotation is -Math.PI/2 which draws text 'vertically'
(with the
* top of the characters on the left).
*
* @param text the text.
* @param g2 the graphics device.
* @param textX the x-coordinate for the text (before rotation).
* @param textY the y-coordinate for the text (before rotation).
* @param angle the angle of the (clockwise) rotation (in radians).
* @param rotateX the point about which the text is rotated.
* @param rotateY the point about which the text is rotated.
*/
public static void drawRotatedString(final String text,
final Graphics2D g2,
final float textX,
final float textY,
final double angle,
final float rotateX,
final float rotateY) {
if ((text == null) || (text.equals(""))) {
return;
}
final AffineTransform saved = g2.getTransform();
// apply the rotation...
final AffineTransform rotate = AffineTransform.getRotateInstance(
angle, rotateX, rotateY
);
g2.transform(rotate);
if (useDrawRotatedStringWorkaround) {
// workaround for JDC bug ID 4312117 and others...
final TextLayout tl = new TextLayout(
text, g2.getFont(), g2.getFontRenderContext()
);
tl.draw(g2, textX, textY);
}
else {
// replaces this code...
g2.drawString(text, textX, textY);
}
g2.setTransform(saved);
}
A couple of comments on the code:
(1) the method allows you to specify the text anchor point and the
rotation point separately - that is used in our library to provide a
range of different alignment options. Just pass in the same (x, y)
point for the rotation point for the simplest case.
(2) the 'useDrawRotatedStringWorkaround' flag just gives two different
ways to draw the text, as a workaround for some JDK bugs (probably fixed
now, I don't get so many reports about the problem anymore). I know
that one method failed on some platforms and the other method failed on
some other platforms, but I forget which.
Regards,
Dave Gilbert
JFreeChart Project Leader
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[JAVA2D] drawString() on Graphics2D question
Hi fellows, I have a short question concerning drawString() on Graphics2D. When using it, the string is printed horizontally. But how can I print text vertically or at arbitrary angles??? A refining question concerns the number of pixels needed for the string. Is there any method to find out how many pixels in all directions will be occupied? Thank you, Sven __ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
