Tcl Library Source Code

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.TH "map::slippy::fetcher" n 0\&.3 tcllib "Mapping utilities"
.BS
.SH NAME
map::slippy::fetcher \- Accessing a server providing tiles for slippy-based maps
.SH SYNOPSIS
package require \fBTcl  8\&.4\fR
.sp
package require \fBTk  8\&.4\fR
.sp
package require \fBimg::png \fR
.sp
package require \fBmap::slippy \fR
.sp
package require \fBmap::slippy::fetcher  ?0\&.3?\fR
.sp
\fB::map::slippy::fetcher\fR \fIfetcherName\fR \fIlevels\fR \fIurl\fR
.sp
\fIfetcherName\fR \fBlevels\fR
.sp
\fIfetcherName\fR \fBtileheight\fR
.sp
\fIfetcherName\fR \fBtilewidth\fR
.sp
\fIfetcherName\fR \fBget\fR \fItile\fR \fIdonecmd\fR
.sp
.BE
.SH DESCRIPTION
This package provides a class for accessing http servers providing
tiles for slippy-based maps\&.
.SH API
.TP
\fB::map::slippy::fetcher\fR \fIfetcherName\fR \fIlevels\fR \fIurl\fR
Creates the fetcher \fIfetcherName\fR and configures it with the
number of zoom \fIlevels\fR supported by the tile server, and the
\fIurl\fR it is listening on for tile requests\&.
.sp
The result of the command is \fIfetcherName\fR\&.
.PP
.SS METHODS
.TP
\fIfetcherName\fR \fBlevels\fR
This method returns the number of zoom levels supported by the fetcher
object, and the tile server it is accessing\&.
.TP
\fIfetcherName\fR \fBtileheight\fR
This method returns the height of tiles served, in pixels\&.
.TP
\fIfetcherName\fR \fBtilewidth\fR
This method returns the width of tiles served, in pixels\&.
.TP
\fIfetcherName\fR \fBget\fR \fItile\fR \fIdonecmd\fR
This is the main method of the fetcher, retrieving the image for the
specified \fItile\fR\&. The tile identifier is a list containing three
elements, the zoom level, row, and column number of the tile, in this
order\&.
.sp
The command refix \fIdonecmd\fR will be invoked when the fetcher
either knows the image for the tile or that no image will forthcoming\&.
It will be invoked with either 2 or 3 arguments, i\&.e\&.
.RS
.IP [1]
The string \fBset\fR, the \fItile\fR, and the image\&.
.IP [2]
The string \fBunset\fR, and the \fItile\fR\&.
.RE
.IP
These two possibilities are used to either signal the image for the
\fItile\fR, or that the \fItile\fR has no image defined for it\&.
.PP
.SH REFERENCES
.IP [1]
\fIhttp://wiki\&.openstreetmap\&.org/wiki/Main_Page\fR
.PP
.SH KEYWORDS
http, location, map, server, slippy, tile, url, zoom