Re: [OpenMap Users] FW: Open map bug with OMCircle???

From: Don Dietrick <dietrick_at_bbn.com>
Date: Thu, 18 Oct 2007 11:10:00 -0400

You can reproduce the bug using the DrawingLayer by trying to draw a
circle starting at 40 degrees latitude in any cylindrical projection,
and increasing the radius until the circle disappears. It looks like
it's a bug in the projection code for handing circles around the pole
under certain conditions.

- Don


On Oct 18, 2007, at 9:00 AM, Carsten . Madsen wrote:

> Hi
>
> Just a thought. The Swing access is not done from the EDT in the
> demo code that may/will cause "weird" behaviour".
>
> Try wrapping the main stuff with
>
> SwingUtilities.invokeLater(new Runnable() {
> public void run() {
> BasicMapFrame frame = new BasicMapFrame();
> // wait 2 seconds then paint the circles
> Thread.sleep(2000);
> frame.paintCircles();
> }
> });
>
> BR
> Carsten
>
> Don Dietrick wrote:
>> Hi Neil,
>>
>> Thanks for the bug report with the code demonstration, I didn't
>> notice this behavior before, I'm not sure why it's happening, but
>> we'll look into it.
>>
>> Thanks again,
>>
>> - Don
>>
>> On Oct 16, 2007, at 4:50 AM, Stevens, Neil wrote:
>>
>>> Hi
>>>
>>> Sometimes I've noticed an OMCircle is not displayed when it is
>>> centered
>>> in the top right quarter of the map displayed. The attached example
>>> illustrates this. It should draw lots of red circles centred
>>> around the
>>> point (40, 30). However any circles with a radius of between 50
>>> and 130
>>> degrees are not drawn when this example is run.
>>>
>>> I have noticed that an OMCircle is not displayed if
>>>
>>> 1) It is centred in the top right quarter of the visible map.
>>>
>>> AND
>>>
>>> 2) It has a radius greater than 90 minus centre point latitude
>>>
>>> AND
>>>
>>> 3) It has a radius less than 90 plus centre point latitude
>>>
>>> Alternatively use the openmap executable program and try drawing a
>>> circle centred in the top right quarter. The same problem occurs
>>> with
>>> the circle not being displayed.
>>>
>>> I am using windows XP with java 1.6 and openmap 4.6.3
>>>
>>> EXAMPLE PROGRAM:
>>> import java.awt.Graphics2D;
>>> import javax.swing.JFrame;
>>> import com.bbn.openmap.*;
>>> import com.bbn.openmap.layer.GraticuleLayer;
>>> import com.bbn.openmap.proj.*;
>>> import com.bbn.openmap.omGraphics.*;
>>>
>>> public class BasicMapFrame extends JFrame {
>>> // The Map bean
>>> private BufferedLayerMapBean mapBean = new BufferedLayerMapBean
>>> ();
>>>
>>> // initialises the map bean and displays it in a frame
>>> public BasicMapFrame()
>>> {
>>> // add openmap bean to frame
>>> this.add(mapBean);
>>> this.setSize(800, 600);
>>> this.setVisible(true);
>>>
>>> //initialise openmap stuff
>>> MapHandler mapHandler = new MapHandler();
>>> mapHandler.add(mapBean);
>>> mapHandler.add(new LayerHandler());
>>> setMapProjection();
>>> mapHandler.add(new GraticuleLayer());
>>> }
>>>
>>> // creates a new BasicMapFrame and paints circles on it
>>> public static void main(String args[]) throws Exception
>>> {
>>> BasicMapFrame frame = new BasicMapFrame();
>>>
>>> // wait 2 seconds then paint the circles
>>> Thread.sleep(2000);
>>> frame.paintCircles();
>>> }
>>>
>>> // should paint read circles around the point (40,30)
>>> public void paintCircles(){
>>> Graphics2D graphics2d = (Graphics2D)mapBean.getGraphics();
>>> graphics2d.setColor(java.awt.Color.RED);
>>>
>>> // paint red circles centre around the point (40, 30)
>>> final float circleCentreLatitude = 40;
>>> final float circleCentreLongitude = 30;
>>> for(float circleRadius = 0; circleRadius < 180; circleRadius
>>> +=1)
>>> {
>>> OMCircle circle = new OMCircle(circleCentreLatitude,
>>> circleCentreLongitude,
>>> circleRadius);
>>>
>>> circle.generate(mapBean.getProjection());
>>> graphics2d.draw(circle.getShape());
>>> }
>>> }
>>>
>>> private void setMapProjection()
>>> {
>>> Projection currentProjection = mapBean.getProjection();
>>> CADRG cadrgProjection = new CADRG(currentProjection.getCenter
>>> (),
>>> currentProjection.getScale(),
>>> currentProjection.getWidth(),
>>> currentProjection.getHeight());
>>>
>>> mapBean.setProjection(cadrgProjection);
>>> }
>>>
>>> }
>>>
>>> Has any one else come across this bug and does any one know of a
>>> work
>>> around for this to make the circle appear?
>>>
>>> Thanks in advance for any help you can give me
>>>
>>> Neil
>>> --------------------------------------------------------
>>>
>>> Rosemount Aerospace Limited.
>>> Registered Office: Stratford Road, Solihull, West Midlands, B90 4LA.
>>> Registered in England No. 02849033.
>>>
>>> --------------------------------------------------------
>>>
>>> --
>>> [To unsubscribe to this list send an email to "majdart_at_bbn.com"
>>> with the following text in the BODY of the message "unsubscribe
>>> openmap-users"]
>>
>> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>> Don Dietrick, dietrick_at_bbn.com
>> BBN Technologies, Cambridge MA
>> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>>
>>
>>
>> --
>> [To unsubscribe to this list send an email to "majdart_at_bbn.com"
>> with the following text in the BODY of the message "unsubscribe
>> openmap-users"]
>
> --
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick_at_bbn.com
BBN Technologies, Cambridge MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=



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Received on Thu Oct 18 2007 - 11:10:49 EDT

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