Re: Fix for panning problem

Hi Chris,

How does this work out when you change scales? Seems that if you zoom
out, the pan factor will appear to diminish, likewise the opposite when
you zoom in. If you don't zoom in or out, it's not a problem, but if
you do, you may need to recalculate the factor to figure out how many
degrees to pan in that direction to move the screen a certain amount.
At least, that's the way I remember what the major obstacle to this
problem was.

Cheers,

Don

On Monday, May 13, 2002, at 12:36 PM, Chris Hopkins wrote:

>
> Hi Don, et. al. -
>
> Here is a fix I made for the panning problem. It allows me to customize
> the
> amount the map pans when I click on one of the panning buttons. The fix
> ultimately lies in the actionPerformed of the NavigatePanel class. I've
> created
> a subclass of the NavigatePanel for our own purposes and wired that
> into a
> customized OMToolSet object (extending both of those...I made no changes
> to the OpenMap source). I use our custom OMToolSet object in the
> openmap.properties file now. The MICAProperties object is a statically
> accessed object I came up with for accessing the OpenMap properties
> object. So for a real fix, the OpenMap properties will need to be
> accessed
> if you want it customizeable through the props file.
>
> Here is what the new actionPerformed method looks like along with a new
> firePaneEvent method. Also, because this is a customized NavigatePanel
> and I didn't want to have to worry about where the images where for the
> navigation UI were, I overloaded the addImageIcon method. I included
> that
> one as well. That way you can just pick up the images in the OpenMap
> .jar file.
>
> public void actionPerformed(java.awt.event.ActionEvent e) {
>
> String command = e.getActionCommand();
>
> float panf = 45.0f;
> Object ob = MICAProperties.get("mica.panfactor");
> if(ob != null)
> {
> String panamt = (String)ob;
> panf = Float.valueOf(panamt).floatValue();
> }
>
> if (command.equals(panNWCmd)) {
> firePanEvent(-45f, panf);
> } else if (command.equals(panNCmd)) {
> firePanEvent(0f, panf);
> } else if (command.equals(panNECmd)) {
> firePanEvent(45f, panf);
> } else if (command.equals(panECmd)) {
> firePanEvent(90f, panf);
> } else if (command.equals(panSECmd)) {
> firePanEvent(135f, panf);
> } else if (command.equals(panSCmd)) {
> firePanEvent(180f, panf);
> } else if (command.equals(panSWCmd)) {
> firePanEvent(-135f, panf);
> } else if (command.equals(panWCmd)) {
> firePanEvent(-90f, panf);
> } else if (command.equals(centerCmd)) {
> // go back to the center point
>
> float lat;
> float lon;
> if (useDefaultCenter) {
> lat = defaultCenterLat;
> lon = defaultCenterLon;
> } else {
> lat = Environment.getFloat(Environment.Latitude, 0f);
> lon = Environment.getFloat(Environment.Longitude, 0f);
> }
> fireCenterEvent(lat, lon);
> }
> }
>
> protected synchronized void firePanEvent(float az, float c) {
> System.out.println("Panning..." + c);
> panDelegate.firePan(az, c);
> }
>
> protected ImageIcon addImageIcon(ImageIcon imageIcon,
> String imageName,
> String imageTip) {
> URL url = NavigatePanel.class.getResource(imageName);
> imageIcon = new ImageIcon(url, imageTip);
> return imageIcon;
> }
>
> The 'panf' amount ends up being the degrees you wish to pan. I
> currently have it set to 0.5 and that seems to be a good amount
> for what we want to do. There is some noticeable flicker if you
> do this in rapid succession but I can live with that for the time
> being.
>
> Feel free to use this to your hearts content. Not sure if this is what
> you intended or not but that's how I fixed it. ;) Feel free to ask me
> any questions or if you want me to send you the source code.
>
> Chris Hopkins
> Software Engineer
> Charles River Analytics
>
> --
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>
>

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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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