<?php
// These are the coordinates the location we wish to plot.
// These are being passed in the URL, but we will set them to a
// default if nothing is passed.
if(empty($long))$long = -63.10774861954596;
if(empty($lat)) $lat = 46.2899306519141;
// First we load the background/base map. We assume it's located in same dir
// as the script.
// This can be any format but we are using JPG in this example
// We will also allocate the color for the marker
$im = imagecreatefromjpeg("earth.jpg");
$red = imagecolorallocate ($im, 255,0,0);
// Next need to find the base image size.
// We need these variables to be able scale the long/lat coordinates.
$scale_x = imagesx($im);
$scale_y = imagesy($im);
$pt = getlocationcoords($lat, $long, $scale_x, $scale_y);
// Now mark the point on the map using a red 4 pixel rectangle
imagefilledrectangle($im,$pt["x"]-2,$pt["y"]-2,$pt["x"]+2,$pt["y"]+2,$red);
imagestring($im,2,1,$scale_y-20,"Courtesy of www.staycanada.ca",$red);
// Return the map image. We are using a PNG format as it gives better final image quality than a JPG
header("Content-Type: image/png");
imagepng($im);
imagedestroy($im);
function getlocationcoords($lat, $lon, $width, $height)
{
$x = (($lon + 180) * ($width / 360));
$y = ((($lat * -1) + 90) * ($height / 180));
return array("x"=>round($x),"y"=>round($y));
}
// Now we convert the long/lat coordinates into screen coordinates
?>Скопировать в буфер
Результат выполнения:
Следующий пример считывает из файла координаты и наносит их все на карту:
<?php
$coord_array = file("coord.txt");
$im = imagecreatefromjpeg("pic/earth_620.jpg");
$red = imagecolorallocate ($im, 255,0,0);
$scale_x = imagesx($im);
$scale_y = imagesy($im);
foreach($coord_array as $value)
{
$co = explode(" ",$value);
$pt = getlocationcoords($co[0], $co[1], $scale_x, $scale_y);
imagefilledrectangle($im,$pt["x"]-1,$pt["y"]-1,$pt["x"]+1,$pt["y"]+1,$red);
}
header("Content-Type: image/jpeg");
imagejpeg($im,"",80);
imagedestroy($im);
function getlocationcoords($lat, $lon, $width, $height)
{
$x = (($lon + 180) * ($width / 360));
$y = ((($lat * -1) + 90) * ($height / 180));
return array("x"=>round($x),"y"=>round($y));
}
?>Скопировать в буфер
Структура файла coord.txt:
-4.2333333 152.2 -4.2333333 152.2 45.0333333 147.9166667 13.4833333 -88.5166667
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