Hello.
I have a solution that seem to work fine, however it is using JTS intersection to clip the geometries without altering the angles. Does OpenMap already have something similar to JTS Geometry#intersection? I am uncertain on how this can be included in standard OpenMap.
Regards,
- Tore.
On Mar 3, 2012, at 04:52 , Don Dietrick wrote:
> Hi Tore,
>
> Yeah, the clipping algorithm is hackish and old. I'll have to think about how to improve it efficiently, and more importantly, correctly. There are a lot of weird cases.
>
> - Don
>
> On Mar 2, 2012, at 9:50 AM, Tore Halset wrote:
>
>> Hello.
>>
>> By disabling the XTHRESHOLD stuff, I got in to a Java 2D hang as I render lots of images in parallelle.
>>
>> at sun.dc.pr.PathDasher.appendLine(Native Method)
>> at sun.dc.pr.Rasterizer.appendLine(Rasterizer.java:462)
>> at sun.java2d.pipe.DuctusRenderer.createShapeRasterizer(DuctusRenderer.java:495)
>> at sun.java2d.pipe.DuctusShapeRenderer.renderPath(DuctusShapeRenderer.java:97)
>> at sun.java2d.pipe.DuctusShapeRenderer.draw(DuctusShapeRenderer.java:46)
>> at sun.java2d.pipe.PixelToParallelogramConverter.draw(PixelToParallelogramConverter.java:130)
>> at sun.java2d.SunGraphics2D.draw(SunGraphics2D.java:2618)
>>
>> It looks like I still need to clip things that is far out of the view, but without changing the angle of lines. Here is the relevant part of GeoProj#forwardPoly.
>>
>> if (Environment.doingXWindowsWorkaround && (scale <= XSCALE_THRESHOLD)) {
>> int i, j, size = stuff.size();
>> float[] xpts, ypts;
>> for (i = 0; i < size; i += 2) {
>> xpts = stuff.get(i);
>> ypts = stuff.get(i + 1);
>> for (j = 0; j < xpts.length; j++) {
>> if (xpts[j] <= -XTHRESHOLD) {
>> xpts[j] = -XTHRESHOLD;
>> } else if (xpts[j] >= XTHRESHOLD) {
>> xpts[j] = XTHRESHOLD;
>> }
>> if (ypts[j] <= -XTHRESHOLD) {
>> ypts[j] = -XTHRESHOLD;
>> } else if (ypts[j] >= XTHRESHOLD) {
>> ypts[j] = XTHRESHOLD;
>> }
>> }
>> stuff.set(i, xpts);
>> stuff.set(i + 1, ypts);
>> }
>> }
>>
>> - Tore.
>>
>> On Mar 2, 2012, at 12:29 , Tore Halset wrote:
>>
>>> Hello.
>>>
>>> I have a OMLine between two lat/lon points. When the user zoom very far in to a part of the line, the line suddenly changes its angle.
>>>
>>> The cause of this strange behaviour is in GeoProj#forwardPoly that adjust screen coordinates outside of XTHRESHOLD with value 16384.
>>>
>>> This is controlled by the Environment.doingXWindowsWorkaround parameter. For Linux and OS X, this seem to be code from svn revision 980 dating back to late 2003. Perhaps this could be removed now?
>>>
>>> Regards,
>>> Tore Halset.
>>>
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>>
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Received on Mon Mar 26 2012 - 10:47:13 EDT