Re: Animations with jTextPane

Posted by Knute... on 10. May 2015

I suggested this because I have some code that I just wrote that uses an
HTML document to display some information on a JTextPane. The data
changes periodically and I just use the setText() method in this case to
change what is displayed. I'm not getting any weird effects and I don't
have to call repaint(). I'm not displaying any images but I don't know
what would be different about that. I'll try some experiments later
today and report back here.



knute...



On 5/10/2015 08:08, [email protected] wrote:




Thank you for helping me with this. We have not tried this, but
please note that we are continouusly changing what image is shown.
The web cam captures a new image and this is shown on the screen, how
could we do this updating with setDocument()?



Den søndag den 10. maj 2015 kl. 16.49.42 UTC+2 skrev Knute Johnson:




On 5/10/2015 02:57, [email protected] wrote:




Hey



We are using OpenCV to grab images from the web cam. The idea is
to show the feed in a jTextPane when the user selects to show
feed, otherwise other stuff can be shown in the pane. This pane
is in a JFrame with lots of other swing objects.



Basic functionality:



IplImage grabbedImage = opencvhighgui.cvQueryFrame(capture);
while ((grabbedImage = opencv
highgui.cvQueryFrame(capture))
!=null) jTextPane1.insertIcon(new
ImageIcon(grabbedImage.getBufferedImage()));



Now, we get problems because this shows multiple video frames.
Obviously, it keeps inserting a new image, so they will be placed
on top of each other.



We tried to clear the pane and then repaint by doing like this
instead:



this.removeIcon(); jTextPane1.repaint();
jTextPane1.insertIcon(new
ImageIcon(grabbedImage.getBufferedImage()));



Where removeIcon looks as can be seen below:



But now, it gets flashy, the user can clearly see how the pane is
cleared and then repainted, just a flashy slow change of images.



So is there any way to get around both of these issues?



private void removeIcon() { for (int i=0;
i<jTextpane1.getStyledDocument().getLength(); i++) { Element
element = jTextPane1.getStyledDocument().getCharacterElement(i);
AttributeSet attributeSet = element.getAttributes(); Icon icon =
StyleConstants.getIcon(attributeSet); if (icon != null) { try {



jTextPane1.getStyledDocument().remove(i, 1);
jTextPane1pane.getStyledDocument().insertString(i, " ", new
SimpleAttributeSet()); icon = null; } catch (Exception exc) {
System.out.println("Exception : " + exc.getMessage()); } } } }




Have you tried just putting the image in a StyledDocument and
using setDocument()?





Knute Johnson







Knute Johnson


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