Making A Gps

[Gunderak]

Iv made the base script im just wondering how to get the x and y's right and moving here is the base
what im wonding how to do is making the markers x in the centre of the background and the dot centered when the player writes /setgps then when the player moves the dot will move either down up right left or diagonally depending where the player is to where the marker is.
i cant figure out how to make the max dots x and y depending on how big the gmap is and making it only move a tiny bit.

PHP Code:

//#CLIENTSIDE


function onCreated() {
    new GuiBitmapCtrl("GPS_Background") {
        x = 210;
        y = 10;
        width = 100;
        height = 100;
        bitmap = "GPS_Background.png";
    }
    new GuiBitmapCtrl("GPS_Marker") {
        x = 240;
        y = 40;
        width = 10;
        height = 10;
        bitmap = "GPS_Marker.png";
    }
    new GuiBitmapCtrl("GPS_Dot") {
        x = 255;
        y = 55;
        width = 10;
        height = 10;
        bitmap = "GPS_Dot.png";
    }
    new GuiTextCtrl("GPS_X") {
        profile = GuiBlueTextProfile;
        height = 20;
        width = 200;
        x = 315;
        y = 65;
        red = 1;
        green = 1;
        blue = 1;
    }
    new GuiTextCtrl("GPS_Y") {
        profile = GuiBlueTextProfile;
        height = 20;
        width = 200;
        x = 315;
        y = 80;
        red = 1;
        green = 1;
        blue = 1;
    }
    onTimeout();
}

function onTimeout() {
    GPS_X.text = "X:  "@client.gpsx;
    GPS_Y.text = "Y:  "@client.gpsy;
    settimer(0.05);
}

function onPlayerChats() {
    if (player.chat == "/setgps") {
        player.chat = "GPS Marker Set!";
        client.gpsx = player.x;
        client.gpsy = player.y;
    }
}