| author | Tero Marttila <terom@fixme.fi> |
| Mon, 25 Jan 2010 02:49:05 +0200 | |
| changeset 72 | c3f8502cfd97 |
| parent 47 | 201257cbd887 |
| child 89 | 02e5b9b08881 |
| permissions | -rw-r--r-- |
| 30 | 1 |
""" |
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Our WSGI web interface, which can serve the JS UI and any .png tiles via HTTP. |
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""" |
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from werkzeug import Request, Response, responder |
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from werkzeug import exceptions |
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import os.path, os |
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import pypngtile as pt |
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DATA_ROOT = os.environ.get("PNGTILE_DATA_PATH") or os.path.abspath('data/')
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IMAGE_CACHE = {}
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TILE_WIDTH = 256 |
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TILE_HEIGHT = 256 |
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# max. output resolution to allow |
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MAX_PIXELS = 1920 * 1200 |
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def dir_view (req, name, path) : |
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prefix = os.path.dirname(req.script_root).rstrip('/')
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parents:
40
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script_prefix = req.script_root |
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name = name.rstrip('/')
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return """\ |
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> |
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<head> |
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<title>Index of %(dir)s</title> |
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<link rel="Stylesheet" type="text/css" href="%(prefix)s/static/style.css"> |
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</head> |
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<body> |
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<h1>Index of %(dir)s</h1> |
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<ul> |
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%(listing)s |
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</ul> |
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</body> |
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</html>""" % dict( |
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parents:
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prefix = prefix, |
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parents:
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dir = name, |
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parents:
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listing = "\n".join( |
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"""<li><a href="%(url)s">%(name)s</a></li>""" % dict( |
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42
a5bca7b0cd8a
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parents:
40
diff
changeset
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url = '/'.join((script_prefix, name, item)), |
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parents:
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name = item, |
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get DATA_ROOT from os.environ, fix use of prefix for dir view
Tero Marttila <terom@fixme.fi>
parents:
40
diff
changeset
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) for item in ['..'] + [i for i in os.listdir(path) if i.endswith('.png') or os.path.isdir(os.path.join(path, i))]
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parents:
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), |
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parents:
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) |
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parents:
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def image_view (req, image_path, image) : |
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image_name = os.path.basename(image_path) |
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img_width, img_height = image.info() |
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return """\ |
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> |
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<head> |
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<title>%(title)s</title> |
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<script src="%(prefix)s/static/prototype.js" type="text/javascript"></script> |
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<script src="%(prefix)s/static/dragdrop.js" type="text/javascript"></script> |
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<script src="%(prefix)s/static/builder.js" type="text/javascript"></script> |
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<script src="%(prefix)s/static/tiles2.js" type="text/javascript"></script> |
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<link rel="Stylesheet" type="text/css" href="%(prefix)s/static/style.css"> |
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</head> |
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<body> |
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<div id="wrapper"> |
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<div id="viewport" style="width: 100%%; height: 100%%"> |
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<div class="overlay"> |
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<input type="button" id="btn-zoom-in" value="Zoom In" /> |
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<input type="button" id="btn-zoom-out" value="Zoom Out" /> |
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<a class="link" id="lnk-image" href="#"></a> |
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</div> |
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<div class="substrate"></div> |
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201257cbd887
add a simple Loading... background
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parents:
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201257cbd887
add a simple Loading... background
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<div class="background"> |
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201257cbd887
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Loading... |
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</div> |
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</div> |
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</div> |
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<script type="text/javascript"> |
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var tile_source = new Source("%(tile_url)s", %(tile_width)d, %(tile_height)d, -4, 0, %(img_width)d, %(img_height)d);
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var main = new Viewport(tile_source, "viewport"); |
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</script> |
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</body> |
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</html>""" % dict( |
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title = image_name, |
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prefix = os.path.dirname(req.script_root).rstrip('/'),
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tile_url = req.url, |
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tile_width = TILE_WIDTH, |
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tile_height = TILE_HEIGHT, |
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img_width = img_width, |
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img_height = img_height, |
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) |
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def scale_by_zoom (val, zoom) : |
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if zoom > 0 : |
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return val << zoom |
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elif zoom > 0 : |
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return val >> -zoom |
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else : |
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return val |
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def render_tile (image, x, y, zoom, width=TILE_WIDTH, height=TILE_HEIGHT) : |
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return image.tile_mem( |
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width, height, |
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scale_by_zoom(x, -zoom), scale_by_zoom(y, -zoom), |
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zoom |
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) |
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def render_image (image, cx, cy, zoom, width, height) : |
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x = scale_by_zoom(cx - width / 2, -zoom) |
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y = scale_by_zoom(cy - height / 2, -zoom) |
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# safely limit |
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if width * height > MAX_PIXELS : |
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raise exceptions.Forbidden("Image too large: %d * %d > %d" % (width, height, MAX_PIXELS))
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return image.tile_mem( |
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width, height, |
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x, y, |
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zoom |
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) |
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def handle_main (req) : |
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# path to image |
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image_name = req.path.lstrip('/')
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# build absolute path |
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image_path = os.path.abspath(os.path.join(DATA_ROOT, image_name)) |
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42
a5bca7b0cd8a
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Tero Marttila <terom@fixme.fi>
parents:
40
diff
changeset
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# ensure the path points inside the data root |
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if not image_path.startswith(DATA_ROOT) : |
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raise exceptions.NotFound(image_name) |
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if os.path.isdir(image_path) : |
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return Response(dir_view(req, image_name, image_path), content_type="text/html") |
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elif not os.path.exists(image_path) : |
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raise exceptions.NotFound(image_name) |
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elif not image_name or not image_name.endswith('.png') :
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raise exceptions.BadRequest("Not a PNG file")
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# get Image object |
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if image_path in IMAGE_CACHE : |
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# get from cache |
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image = IMAGE_CACHE[image_path] |
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else : |
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# ensure exists |
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if not os.path.exists(image_path) : |
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30
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raise exceptions.NotFound(image_name) |
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# cache |
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image = IMAGE_CACHE[image_path] = pt.Image(image_path) |
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parents:
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parents:
30
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if image.status() == pt.CACHE_NONE : |
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parents:
30
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raise exceptions.InternalServerError("Image not cached: " + image_name)
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# what view? |
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if not req.args : |
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# viewport |
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return Response(image_view(req, image_path, image), content_type="text/html") |
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elif 'w' in req.args and 'h' in req.args and 'cx' in req.args and 'cy' in req.args : |
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# specific image |
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width = int(req.args['w']) |
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height = int(req.args['h']) |
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cx = int(req.args['cx']) |
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cy = int(req.args['cy']) |
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zoom = int(req.args.get('zl', "0"))
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# yay full render |
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return Response(render_image(image, cx, cy, zoom, width, height), content_type="image/png") |
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elif 'x' in req.args and 'y' in req.args : |
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# tile |
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x = int(req.args['x']) |
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y = int(req.args['y']) |
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zoom = int(req.args.get('zl', "0"))
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# yay render |
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return Response(render_tile(image, x, y, zoom), content_type="image/png") |
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else : |
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raise exceptions.BadRequest("Unknown args")
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@responder |
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def application (env, start_response) : |
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req = Request(env, start_response) |
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try : |
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return handle_main(req) |
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except exceptions.HTTPException, e : |
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return e |
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