Add MapQuest-style pan and zoom controls to the floormap.php3 page, and
generally improve the clarity and appearance of the maps. The scale factor buttons numbered 1-5 actually correspond to scale factors of 1, 1.5, 2, 2.5, and 3. Notice that the floorimages table in the database now has an integer "scale" column to distinguish the cached zoomed-in images with a suffix "-[1-5].jpg" . I use jpeg files instead of the png files that were used before. They look as good or better, and are a third the size. Panning around at a given zoom factor just involves cropping out a different rectangle of the scaled-up images. The 0311X064_[1-4]fl.pdf floor map files we got from Michael Kay started out life in Adobe Illustrator. Although GhostScript/gv crash while trying to draw the pdf files, extracting them into PostScript files in Acrobat on Coke allows GhostScript to render them flawlessly. I started out using gs to render jpeg files in the shell, and then found that ImageMagick uses the same GhostScript renderer, and nicely handles cropping, drawing and annotations, and format conversion as well. The PostScript rendering gets slow at higher zoom factors. So I cache the zoomed floor images, scaled up by rendering the PostScript files at a finer dot-pitch (density) in GhostScript, and then cropping out the right rectangle to register them properly. For readability, and to avoid having the thin lines and bitmap fonts used in some parts of the PostScript map from falling between the pixel cracks, I actually render at twice the pixel density and filter down to the final image with a gaussian -sharpen option to keep it from looking blurry. ImageMagick is callable from both the shell and as the Image::Magick package in Perl. I converted the Perl logic in floormap.in to use Image::Magick instead of the GD graphics library, resulting in anti-aliased (smoothed) drawing of the wireless node dots and labels on floor maps for a better appearance. Then I added optional scaling and centering arguments which select the proper cached zoomed-in image, and drive the logic for cropping and drawing. I modified the floormap.php3 file to wrap an input form around a set of zoom control buttons and the floormap image. The zoom buttons set the scale argument to the Perl floormap script called on the server. The floor map image itself is wrapped in a graphical submit button, so clicking on it returns the mouse coordinates within the image, which are then sent to the centering argument of the Perl script.
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