points2pieces.sh

#!/bin/bash

BC=$(which bc)

if [[ ${#BC} -eq 0 ]]; then
    echo "Install bc first."
    exit 1
fi

WGET=$(which wget)
CURL=$(which curl)
if [[ ${#WGET} -eq 0 ]]; then
    if [[ ${#CURL} -eq 0 ]]; then
        echo "Install wget or curl first."
        exit 1
    else
        DOWNLOAD="$CURL -L -s -o"
    fi
else
    DOWNLOAD="$WGET --quiet -O"
fi

DRY_RUN=""
WITH_TRAFFIC=0
for arg in "$@"
do
    case "$arg" in
        --dry-run)
            shift
            DRY_RUN="echo"
            DOWNLOAD="$DRY_RUN $DOWNLOAD"
            echo "#!/bin/bash"
            ;;
        --with-traffic)
            shift
            WITH_TRAFFIC=1
            ;;
    esac
done

ARG_1=${1//,/}
ARG_2=$2
ARG_3=${3//,/}
ARG_4=$4

if [[ $ARG_1 =~ ^[+-]?[0-9]*\.?[0-9]+$ ]] &&
   [[ $ARG_2 =~ ^[+-]?[0-9]*\.?[0-9]+$ ]] &&
   [[ $ARG_3 =~ ^[+-]?[0-9]*\.?[0-9]+$ ]] &&
   [[ $ARG_4 =~ ^[+-]?[0-9]*\.?[0-9]+$ ]]
then
    START_X=$ARG_1
    START_Y=$ARG_2
    END_X=$ARG_3
    END_Y=$ARG_4
else
    echo "Please provide two points."
    exit 1
fi

if [[ $5 =~ ^[0-9]+$ ]] && [[ $5 -le 19 ]] && [[ $5 -ge 1 ]]; then
    LEVEL=$5
else
    LEVEL=12
fi

VER_DEFAULT="015"
VER=$VER_DEFAULT

case $6 in
    sate)
        TYPE=sate
        MODE=46
        VER="009"
        ;;
    web-alt)
        TYPE=web
        if [[ $LEVEL -gt 9 ]] && [[ $LEVEL -lt 19 ]]; then
            MODE=41
        else
            MODE=44
        fi
        if [[ $WITH_TRAFFIC -eq 1 ]]; then
            MODE=44
        fi
        STYLES=ph
        ;;
    *)
        TYPE=web
        MODE=44
        STYLES=pl
        ;;
esac

MAPS="`pwd`/maps"

if [[ ! -d ${MAPS} ]]; then
    $DRY_RUN mkdir "${MAPS}"
else
    $DRY_RUN rm -f "${MAPS}"/*
fi

ceil()
{
    if [[ $(echo "${!1} == 0${!1/.*}" | $BC ) -eq 1 ]]; then
        eval "${1}=\${!1/.*}"
    else
        eval "${1}=\$((\${!1/.*}+1))"
    fi
}

set_block_num_of()
{
    local BN=$((${!3}-18))
    BN=${BN/-/}
    BN=$(echo "scale=10; ${!1} / 2 ^ ${BN} / 256" | $BC )
    ceil BN
    eval "${5}=\${BN}"
}

TRAFFIC="http://its.map.baidu.com:8002/traffic/TrafficTileService?time=0&label=web2D"

download()
{
    SERVER=$((RANDOM%9+1))
    if [[ ! -f "${MAPS}/${1},${2}.png" ]]; then
        if [[ ${#DRY_RUN} -eq 0 ]]; then
            if [[ $TYPE == "sate" ]]; then
                SERVER="http://shangetu${SERVER}.map.bdimg.com/it/"
                $DOWNLOAD "${MAPS}/${1},${2}.png"\
                    "${SERVER}u=x=${1/-/M};y=${2/-/M};z=${3};v=${5};type=${4}&fm=${6}" &
            else
                SERVER="http://online${SERVER}.map.bdimg.com/tile/?qt=tile&"
                $DOWNLOAD "${MAPS}/${1},${2}.png"\
                    "${SERVER}x=${1/-/M}&y=${2/-/M}&z=${3}&styles=${7}" &
            fi
            if [[ $WITH_TRAFFIC -eq 1 ]]; then
                $DOWNLOAD "${MAPS}/${1},${2}.png.traffic"\
                    "${TRAFFIC}&v=${5}&level=${3}&x=${1/-/M}&y=${2/-/M}" &
            fi
        else
            if [[ $TYPE == "sate" ]]; then
                SERVER="http://shangetu${SERVER}.map.bdimg.com/it/"
                $DOWNLOAD \""${MAPS}/${1},${2}.png\""\
                    \""${SERVER}u=x=${1/-/M};y=${2/-/M};z=${3};v=${5};type=${4}&fm=${6}\"" \&
            else
                SERVER="http://online${SERVER}.map.bdimg.com/tile/?qt=tile&"
                $DOWNLOAD \""${MAPS}/${1},${2}.png\""\
                    \""${SERVER}x=${1/-/M}&y=${2/-/M}&z=${3}&styles=${7}\"" \&
            fi
            if [[ $WITH_TRAFFIC -eq 1 ]]; then
                $DOWNLOAD \""${MAPS}/${1},${2}.png.traffic\""\
                    \""${TRAFFIC}&v=${5}&level=${3}&x=${1/-/M}&y=${2/-/M}\"" \&
            fi
        fi
    fi
}

set_block_num_of START_X at_level LEVEL to START_BLOCK_X
set_block_num_of START_Y at_level LEVEL to START_BLOCK_Y

set_block_num_of END_X at_level LEVEL to END_BLOCK_X
set_block_num_of END_Y at_level LEVEL to END_BLOCK_Y

if [[ $START_BLOCK_X -eq $END_BLOCK_X ]] && [[ $START_BLOCK_Y -eq $END_BLOCK_Y ]]; then
    download $START_BLOCK_X $END_BLOCK_X $LEVEL $TYPE $VER $MODE $STYLES
elif [[ $START_BLOCK_X -eq $END_BLOCK_X ]] && [[ $START_BLOCK_Y -gt $END_BLOCK_Y ]]; then
    for (( J=$END_BLOCK_Y ; J<$START_BLOCK_Y ; J++ )) ; do
        download $START_BLOCK_X $J $LEVEL $TYPE $VER $MODE $STYLES
    done
elif [[ $START_BLOCK_X -lt $END_BLOCK_X ]] && [[ $START_BLOCK_Y -eq $END_BLOCK_Y ]]; then
    for (( J=$START_BLOCK_X; J<$END_BLOCK_X; J++ )) ; do
        download $J $START_BLOCK_Y $LEVEL $TYPE $VER $MODE $STYLES
    done
elif [[ $START_BLOCK_X -lt $END_BLOCK_X ]] && [[ $START_BLOCK_Y -gt $END_BLOCK_Y ]]; then
    for (( J=$START_BLOCK_Y; J>$END_BLOCK_Y; J-- )) ; do
        for (( K=$START_BLOCK_X; K<$END_BLOCK_X; K++ )) ; do
            download $K $J $LEVEL $TYPE $VER $MODE $STYLES
        done
        $DRY_RUN wait
    done
fi

$DRY_RUN wait