Re: Meter to radians

From: Don Dietrick <dietrick@bbn.com>
Date: Tue May 21 2002 - 08:34:06 EDT

Hello,

You should use an OMRect object for rectangles, and you need to add the
distance to the second centerY coordinate (instead of subtracting it).

I'm not sure your algorithm will work, at least for all projections (it
seems like it should, but I have a nagging suspicion it doesn't). I'd
use the com.bbn.openmap.proj.GreatCircle.spherical_between() method to
calculate your corner points of the rectangle.

Hope this helps,

Don

On Thursday, May 16, 2002, at 10:32 PM, someyo_project wrote:

> hi,everyone<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp; I want to generate a
> rectangle that own 2000 meter width and 1000 meter
> height.<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp; I used the function
> Length.METER.toRadians,but finnally I got a rectangle whose width is 15
> meters and height is 35 meters.<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;
> y???<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp; any reply will be
> appreciated.<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp; fllow my code:<BR>&gt;
> /********************************************************************************<BR>
> &gt;&nbsp;&nbsp;&nbsp;&nbsp; public OMGraphicList createGraphics
> (OMGraphicList graphics)
> {<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OMLine
> line;<BR>&gt; <BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> graphics.clear();<BR>&gt;
> <BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /<A
> href="file://create">/create</A> a rectange that own width 2000 M and
> height 1000M<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <A
> href="file://and!
> !
> !
> !
> !
> ">//and</A> center at beijing
> site<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; float
> centerX =
> 39.5622f;<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; float
> centerY =
> 116.2422f;<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A
> href="file://bottom">//bottom</A>
> line<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; line =
> createLine(centerX -
> Length.METER.toRadians(1000f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerY -
> Length.METER.toRadians(500f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerX +
> Length.METER.toRadians(1000f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; center!
> !
> !
> !
> !
> Y -
> Length.METER.toRadians(500f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> OMGraphic.LINETYPE_STRAIGHT,<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> Color.red,
> Color.yellow);<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> line.setAppObject(new
> Integer(10));<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> graphics.addOMGraphic(line);<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp; //right
> line<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; line =
> null;<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; line =
> createLine(centerX +
> Length.METER.toRadians(1000f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerY -
> Length.METER.toRadians(500f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n!
> !
> !
> !
> !
> bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerX +
> Length.METER.toRadians(1000f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerY +
> Length.METER.toRadians(500f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> OMGraphic.LINETYPE_STRAIGHT,<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Color.green,
> Color.yellow);<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> line.setAppObject(new
> Integer(20));<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> graphics.addOMGraphic(line);<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp; <A !
> !
> !
> !
> !
> href="file://top">//top</A>
> line<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; line =
> null;<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; line =
> createLine(centerX -
> Length.METER.toRadians(1000f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerY +
> Length.METER.toRadians(500f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerX +
> Length.METER.toRadians(1000f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerY +
> Length.METER.toRadians(500f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs!
> !
> !
> !
> !
> p;
> OMGraphic.LINETYPE_STRAIGHT,<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Color.blue,
> Color.yellow);<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> line.setAppObject(new
> Integer(30));<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> graphics.addOMGraphic(line);<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp; //left
> line<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; line =
> null;<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; line =
> createLine(centerX -
> Length.METER.toRadians(1000f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerY -
> Length.METER.toRadians(500f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;!
> !
> !
> !
> !
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerX -
> Length.METER.toRadians(1000f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; centerY +
> Length.METER.toRadians(500f),<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> OMGraphic.LINETYPE_STRAIGHT,<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Color.blue,
> Color.yellow);<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> line.setAppObject(new
> Integer(40));<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> graphics.addOMGraphic(line);<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
> &nbsp;&nbsp; return graphics;<BR>&gt;&nbsp;&nbsp;&nbsp;&nbsp;
> }<BR>&gt; *********!
> !
> !
> !
> !
> ***********************************************************************/<BR>
> &gt; <BR>&gt; thanx u in advance!<BR>&gt; <BR>
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, BBN Technologies, dietrick@bbn.com
10 Moulton Street, Cambridge, MA 02138
617-873-3031 [fax]-2794
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 

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Received on Tue May 21 08:34:12 2002

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