[ka-Map-users] Overlay image

[Brent Pedersen]

hi, if i understand correctly
if you overlay your own image, it is static and you must do
myKaMap.registerForEvent(KAMAP_SCALE_CHANGED,this,redrawFunction)

in order to get a new image on zoom in/out. where redrawFunction has to
remove current image, and resend the request for a new image given the new
extents
-brent

On 9/29/05, jochen at ingenieurteam2.com <jochen at ingenieurteam2.com> wrote:
>
> Hello ka-map user,
>
> I want to highlight polygons on the map (based on a query).
> To do this (and perhaps other things) I want to render an image
> with the size of the viewport which contains the visible part of the map.
> And then overlay this image over the viewport.
> This works as I suppose but I have problem with the scale.
> It seems like there is a fractor missing. But which?
>
> Best regards,
> Jochen
>
>
> //overlay.js start
> function jg (oKaMap)
> {
> this.kaMap = oKaMap;
> this.highlight = jg_highlight;
> this.drawOverlay = jg_drawOverlay;
> }
>
> function jg_highlight()
> {
> var px = this.kaMap.getGeoExtents();
> var url = this.kaMap.server + "/overlay.php";
> url += "?map=" + this.kaMap.currentMap;
> url += "&width=" + this.kaMap.viewportWidth;
> url += "&height=" + this.kaMap.viewportHeight;
> url += "&minx=" + px[0];
> url += "&miny=" + px[1];
> url += "&maxx=" + px[2];
> url += "&maxy=" + px[3];
> call(url, this, this.drawOverlay);
> }
>
> function jg_drawOverlay (szResult)
> {
> eval( szResult );
> var canvas = myKaMap.createDrawingCanvas( 500 );
> var img = document.createElement( 'img' );
> img.src = this.imgSrc;
> img.style.width = this.kaMap.viewportWidth + "px";
> img.style.height = this.kaMap.viewportHeight + "px";
> this.kaMap.addObjectGeo(canvas, this.imgX, this.imgY, img );
> }
> //overlay.js start
>
> //overlay.php start
> <?php
> dl('php_mapscript_46.dll');
>
> $width = $_REQUEST['width'];
> $height = $_REQUEST['height'];
> $minx = $_REQUEST['minx'];
> $miny = $_REQUEST['miny'];
> $maxx = $_REQUEST['maxx'];
> $maxy = $_REQUEST['maxy'];
>
> $map = ms_newMapObj("c:/path/file.map"); // the same mapfile like ka-map
> shows
> $map->outputformat->set("transparent", MS_ON );
> $l1 = $map->getLayerByName ("L1");
> $l1 -> set("status", MS_OFF);
> $l2 = $map->getLayerByName ("L2");
> $l2 -> set("status", MS_OFF);
> $l3 = $map->getLayerByName ("L3");
> $c3 = $l3 -> getClass (0);
> $style = ms_newStyleObj($c3);
> $style->color->setRGB(255,0,0); // simulate highlighting
> $map -> setExtent ($minx, $miny, $maxx, $maxy);
> $map -> setSize ($width, $height);
> $image=$map->draw();
> $image_url=$image->saveWebImage();
> $szResult = "this.imgSrc = '".$image_url."';";
> $szResult .= "this.imgX = ".$minx.";";
> $szResult .= "this.imgY = ".$maxy.";";
> echo $szResult;
> ?>
> //overlay.php end
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>
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