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Hi - I am getting some text
from a database and drawing it on a JSVGCanvas and then adding some decorations,
e.g. highlighting in the form of partially transparent rectangles over the text. Originally I tried to create the whole
svg document in memory then set it to be displayed but this failed, sometimes,
because I used aTextElementNode.getBounds().getWidth() to determine the size of
a line and I suppose the size was undefined because the text hadn’t been
rendered yet. I put all of these
render-sensitive calls inside a block like this: canvas.addGVTTreeRendererListener(new
GVTTreeRendererAdapter() {
public void
gvtRenderingCompleted(GVTTreeRendererEvent e) {
doHighLighting(); // … doOtherTextDecorations();
// …and handle clicks on text and changes to highlighting } }); and it seems to have solved that
problem, although it seems a bit strange to have basically put the entire rest
of the program inside the GVTTreeRendererListener. However, two new problems came up: 1st: The highlight boxes only appear after you move the
mouse over the JSVGCanvas. 2nd: If the enclosing JFrame is resized, the following error
occurs. The OutOfMemory line
appears once, the next section is repeated over and over a couple hundred
times. java.lang.OutOfMemoryError java.lang.IllegalStateException: RunnableQueue not started or has
exited at org.apache.batik.util.RunnableQueue.invokeLater(Unknown
Source) at
org.apache.batik.swing.svg.JSVGComponent$SVGListener.dispatchMouseEntered(Unknown
Source) at
org.apache.batik.swing.gvt.JGVTComponent$Listener.mouseEntered(Unknown Source) at java.awt.AWTEventMulticaster.mouseEntered(AWTEventMulticaster.java:237) at java.awt.Component.processMouseEvent(Component.java:5030) at java.awt.Component.processEvent(Component.java:4818) at java.awt.Container.processEvent(Container.java:1525) at java.awt.Component.dispatchEventImpl(Component.java:3526) at java.awt.Container.dispatchEventImpl(Container.java:1582) at java.awt.Component.dispatchEvent(Component.java:3367) at
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3359) at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java:3199) at
java.awt.LightweightDispatcher.processMouseEvent(Container.java:3056) at
java.awt.LightweightDispatcher.dispatchEvent(Container.java:3004) at java.awt.Container.dispatchEventImpl(Container.java:1568) at java.awt.Window.dispatchEventImpl(Window.java:1581) at java.awt.Component.dispatchEvent(Component.java:3367) at java.awt.EventQueue.dispatchEvent(EventQueue.java:445) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:191) at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144) at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130) at
java.awt.EventDispatchThread.run(EventDispatchThread.java:98) If anyone has any input on
either of these problems it would be appreciated. -Randy |
