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# FixMyStreet:Map::WMTSBase
# Makes it easier for cobrands to use their own WMTS base map.
# This cannot be used directly; you must subclass it and implement several
# methods. See, e.g. FixMyStreet::Map::Zurich or FixMyStreet::Map::Bristol.
package FixMyStreet::Map::WMTSBase;
use parent FixMyStreet::Map::WMXBase;
use strict;
# A hash of parameters used in calculations for map tiles
sub tile_parameters {
my $params = {
urls => [ '' ], # URL of the map tiles, up to the /{z}/{x}/{y} part
layer_names => [ '' ],
wmts_version => '1.0.0',
layer_style => '',
matrix_set => '',
suffix => '', # appended to tile URLs
size => 256, # pixels
dpi => 96,
inches_per_unit => 0, # See OpenLayers.INCHES_PER_UNIT for some options.
origin_x => 0,
origin_y => 0,
projection => 'EPSG:3857', # Passed through to OpenLayers.Projection
};
return $params;
}
sub _get_tile_params {
my ($self, $params, $left_col, $top_row, $z, $tile_url) = @_;
return ($tile_url, $z, $self->tile_parameters->{suffix});
}
sub _get_tile_src {
my ($self, $tile_url, $z, $suffix, $col, $row) = @_;
return sprintf( '%s/%d/%d/%d%s',
$tile_url, $z, $row, $col, $suffix);
}
sub _get_tile_id {
my ($self, $tile_url, $x, $suffix, $col, $row) = @_;
return sprintf( '%d.%d', $col, $row);
}
sub _get_row {
my ($self, $top_row, $row_offset, $size) = @_;
return $top_row + $row_offset;
}
sub _get_col {
my ($self, $left_col, $col_offset, $size) = @_;
return $left_col + $col_offset;
}
sub map_type { 'OpenLayers.Layer.WMTS' }
sub _map_hash_extras {
my $self = shift;
return {
layer_style => $self->tile_parameters->{layer_style},
matrix_set => $self->tile_parameters->{matrix_set},
origin_x => force_float_format($self->tile_parameters->{origin_x}),
origin_y => force_float_format($self->tile_parameters->{origin_y}),
tile_suffix => $self->tile_parameters->{suffix},
};
}
sub tile_base_url {
my $self = shift;
my $params = $self->tile_parameters;
return sprintf '%s/%s/%s/%s/%s',
$params->{urls}[0], $params->{wmts_version}, $params->{layer_names}[0],
$params->{layer_style}, $params->{matrix_set};
}
# Given a lat/lon, convert it to tile co-ordinates (precise).
sub latlon_to_tile($$$$) {
my ($self, $lat, $lon, $zoom) = @_;
my ($x, $y) = $self->reproject_from_latlon($lat, $lon);
my $tile_params = $self->tile_parameters;
my $matrix_id = $zoom + $self->zoom_parameters->{id_offset};
my @scales = $self->scales;
my $tileOrigin = {
lon => $tile_params->{origin_x},
lat => $tile_params->{origin_y}
};
my $res = $scales[$zoom] /
($tile_params->{inches_per_unit} * $tile_params->{dpi});
# OpenLayers.INCHES_PER_UNIT[units] * OpenLayers.DOTS_PER_INCH
my $fx = ( $x - $tileOrigin->{lon} ) / ($res * $tile_params->{size});
my $fy = ( $tileOrigin->{lat} - $y ) / ($res * $tile_params->{size});
return ( $fx, $fy, $matrix_id );
}
# Given a lat/lon, convert it to OSM tile co-ordinates (nearest actual tile,
# adjusted so the point will be near the centre of a 2x2 tiled map).
#
# Takes parameter for rows/cols. For even sizes (2x2, 4x4 etc.) will
# do adjustment, but simply returns actual for odd sizes.
#
sub latlon_to_tile_with_adjust {
my ($self, $lat, $lon, $zoom, $rows, $cols) = @_;
my ($x_tile, $y_tile, $matrix_id)
= my @ret
= $self->latlon_to_tile($lat, $lon, $zoom);
# Try and have point near centre of map, passing through if odd
unless ($cols % 2) {
if ($x_tile - int($x_tile) > 0.5) {
$x_tile += 1;
}
}
unless ($rows % 2) {
if ($y_tile - int($y_tile) > 0.5) {
$y_tile += 1;
}
}
return ( int($x_tile), int($y_tile), $matrix_id );
}
sub tile_to_latlon {
my ($self, $fx, $fy, $zoom) = @_;
my $tile_params = $self->tile_parameters;
my @scales = $self->scales;
my $tileOrigin = {
lon => $tile_params->{origin_x},
lat => $tile_params->{origin_y}
};
my $res = $scales[$zoom] /
($tile_params->{inches_per_unit} * $tile_params->{dpi});
# OpenLayers.INCHES_PER_UNIT[units] * OpenLayers.DOTS_PER_INCH
my $x = $fx * $res * $tile_params->{size} + $tileOrigin->{lon};
my $y = $tileOrigin->{lat} - $fy * $res * $tile_params->{size};
my ($lat, $lon) = $self->reproject_to_latlon($x, $y);
return ( $lat, $lon );
}
# Given a lat/lon, convert it to pixel co-ordinates from the top left of the map
sub latlon_to_px($$$$$$) {
my ($self, $lat, $lon, $x_tile, $y_tile, $zoom) = @_;
my ($pin_x_tile, $pin_y_tile) = $self->latlon_to_tile($lat, $lon, $zoom);
my $pin_x = $self->tile_to_px($pin_x_tile, $x_tile);
my $pin_y = $self->tile_to_px($pin_y_tile, $y_tile);
return ($pin_x, $pin_y);
}
# Convert tile co-ordinates to pixel co-ordinates from top left of map
# C is centre tile reference of displayed map
sub tile_to_px {
my ($self, $p, $c) = @_;
$p = $self->tile_parameters->{size} * ($p - $c);
$p = int($p + .5 * ($p <=> 0));
return $p;
}
sub click_to_tile {
my ($self, $pin_tile, $pin) = @_;
my $tile_size = $self->tile_parameters->{size};
$pin -= $tile_size while $pin > $tile_size;
$pin += $tile_size while $pin < 0;
return $pin_tile + $pin / $tile_size;
}
# Given some click co-ords (the tile they were on, and where in the
# tile they were), convert to WGS84 and return.
sub click_to_wgs84 {
my ($self, $c, $pin_tile_x, $pin_x, $pin_tile_y, $pin_y) = @_;
my $tile_x = $self->click_to_tile($pin_tile_x, $pin_x);
my $tile_y = $self->click_to_tile($pin_tile_y, $pin_y);
my $zoom = (defined $c->get_param('zoom') ? $c->get_param('zoom') : $self->zoom_parameters->{default_zoom});
my ($lat, $lon) = $self->tile_to_latlon($tile_x, $tile_y, $zoom);
return ( $lat, $lon );
}
sub force_float_format {
my $in = shift;
return mySociety::Locale::in_gb_locale {
sprintf( '%f', $in );
};
}
1;
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