[Geomoose-users] Legends in printable maps

[Bistrais, Bob]

I have been playing around with this and I have come up with something that works.  A bit crude and could probably be improved, but the bottom line is that you get a dynamic legend on the PDF maps.

Most of the coding is done by modifying the existing print.php.  But first there’s a bit of setup work with the templates.  Modify your map templates so that you have an area to place the legend.

Next, you need to create images of each legend item.  I simply took a screenshot of my GM application with all layers turned on, then in Paint.net, I created an image for each layer’s legend.  Save these to the application’s htdocs/images folder.

Now for the code, again in the existing print.php file.  Insert this after the following line, around line 225:
                $pdf->Image($tempDir.$uniqueId.'_pdf.jpg', $imageX, $imageY, $imageW, $imageH);

-Insert this:
                //-------------------------------- Add images to form legend elements
                //--------------------------------extract the list of layer names so that we can use them in the map legend
                // We will create a new array with layer names to put in legend.  We do this because I want to not include
                // certain layers (such as background layers), and I want to reverse the order, so the print map legend
                // will appear in the same order as on the web application.
                // If that doesn't matter to you, you can leave out the string comparison and array reversal code...

                //create new, empty array
                $legendLayers = array();

                //Iterate through print_info to get the actual layer names
                for($i=0;$i < sizeof($print_info); $i++){
                                for ($j=0;$j < sizeof($print_info[$i][layers]); $j++){
                                                $layName = $print_info[$i][layers][$j];
                                                //String comparison so we only select the layers we want in the legend...
                                                if((strcmp($layName, "Roads")) == 0 || (strcmp($layName, "Blks00")) == 0 || (strcmp($layName, "wicp")) == 0 || (strcmp($layName, "farmers_markets")) == 0 || (strcmp($layName, "wic_vendors_large")) == 0 || (strcmp($layName, "wic_vendors_small")) == 0 || (strcmp($layName, "wic_clinics")) == 0) {
                                                                //add it to the array
                                                                array_push($legendLayers, $layName);
                                                }
                                }
                }

                //reverse the array order
                $legendLayers = array_reverse($legendLayers);

                //Compose the legend onto the page
                //Set a few variables for legend element image size and position:
                $lx = 36; //Legend element, position from page left, pixels
                $ly = 110; //Legend element, position from page top, pixels.  Will vary as elements are added, this is the position of first element.
                $lWidth = 100; //Legend element, image width, pixels
                $lHeight = 0; //Legend element, height, pixels, initializing at 0 but will change

                //Iterate through the new array ($legendLayers), place the legend elements on the map page
                for($i=0; $i<sizeof($legendLayers); $i++){
                                $imageName = '../images/'.$legendLayers[$i].'.png';
                                $lHeight = (getimagesize($imageName)[1] * 0.80); //Scaling down image height to 80% of actual image size, so it fits
                                $pdf->Image($imageName,$lx,$ly,$lWidth,$lHeight);
                                $ly += ($lHeight + 5);
                }


--- I added some if-then code that varies the placement of items depending on page size and orientation, but the above is the code used for 8-1/2X11, Landscape.

So this is a fairly simple way of adding the legend to PDF maps, nothing fancy, but it works.  I hope this might help other GeoMoose users.

-Bob


From: Basques, Bob (CI-StPaul) [mailto:bob.basques at ci.stpaul.mn.us]
Sent: Thursday, July 23, 2015 6:13 PM
To: TC Haddad
Cc: Bistrais, Bob; geomoose-users at lists.osgeo.org
Subject: Re: [Geomoose-users] Legends in printable maps

All,

We’ve talked about this for years in my shop, all sorts of ways to approach this . . .

Something else to think about on this, might be a method to set up a extra layer on the fly for each layer turned on and add that on top pf the map.

bobb


On Jul 23, 2015, at 4:41 PM, TC Haddad <tchaddad at gmail.com<mailto:tchaddad at gmail.com>> wrote:


I never filed anything in GitHub about it, but I did dig around a bit for some old code that would embed a legend in the PDF. I think with some modifications, it can be made to work. Beyond that I got busy, and never came back around to it.
I still think it's a good idea, and also have folks who would like to use it. I'll open an enhancement issue, and start adding what little items I have dug up...
Tanya



On Thu, Jul 23, 2015 at 2:13 PM, Bistrais, Bob <Bob.Bistrais at maine.gov<mailto:Bob.Bistrais at maine.gov>> wrote:
I saw this topic came up pretty recently: http://lists.osgeo.org/pipermail/geomoose-users/2015-April/005601.html

Has there been any progress on that?  I have a project where the client is interested in a printed legend.

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