Hi,
I implemented autowrapping for tooltip texts, i.e. modified the method
batik.swing.JSVGCanvas.CanvasUserAgent.toFormattedHTML
such that it is possible to break lines at a certain threshold. So that the
formatting is not messed up, the code is attached separately.
Basically, the method which autowraps is a greedy algorithm with the
following properties:
--- for each word, it checks whether it would still fit in the line, and if
not, it breaks before the word.
--- if there should be a word which happens to be longer than the line size,
we put this word in a separate line which is as long as the word size (this
should happen very rarely if the line size is chosen appropriately; 50
characters seemed okay to me).
I know that hardcoding the line length of 50 characters right in the method
is not a good idea, but as I am not sure of how Batik handles such kind of
parameters, I left it there. If you should include it within the official
release at some time, which you should feel free to do if you want, I would
suggest putting the lengh definition somewhere with other variables of the type.
I tested the method with several test cases and I tried to comment the code
well. Should there be any questions, feel free to ask. Of course, I am also
open for comments. Even with big, big SVG files (~2MB) with lots of shapes I
did not notice any performance drawback.
Regards,
Frank
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// Replace batik.swing.JSVGCanvas.CanvasUserAgent.toFormattedHTML with this if you
// want autowrapping tooltips.
// Frank Walter
/**
* Converts line breaks to HTML breaks and encodes special entities.
* Poor way of replacing '<', '>', '"', '&' and ''' in attribute values.
* Auto-wraps the text at 50 characters.
*/
public String toFormattedHTML(String str) {
StringBuffer sb = new StringBuffer(str);
replace(sb, XML_CHAR_AMP, XML_ENTITY_AMP);
replace(sb, XML_CHAR_LT, XML_ENTITY_LT);
replace(sb, XML_CHAR_GT, XML_ENTITY_GT);
replace(sb, XML_CHAR_QUOT, XML_ENTITY_QUOT);
replace(sb, XML_CHAR_APOS, XML_ENTITY_APOS);
// Line length.
int length = 50;
// Offset.
int offset = 0;
// Index pointers.
int i = 0; int j=0;
while (true) {
// Find the next space.
j = sb.indexOf(" ",i);
// If there is a space,...
if (j != -1) {
// Special case: a word can be longer than a line.
// Treat this word as its own line.
if (j-i > length) {
// Insert break before word.
sb.replace(i-1,i,"<br>");
// Move index.
i = ++j;
// Insert break after word.
sb.replace(j-1,j,"<br>");
// Reset offset.
offset = i;
}
// General case: a word cannot be longer than a line.
// Check whether one has to break or not.
else if (j - offset < length) {
// No: move index.
i = ++j;
} else {
// Yes: insert break.
sb.replace(i-1,i,"<br>");
// Reset offset.
offset = i;
}
}
// ...there is not, else, break.
else {
break;
}
}
return sb.toString();
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