#define BRIDGE:NEXUS C_TERRAIN_VALUE NW_TERRAIN_VALUE N_TERRAIN_VALUE NE_TERRAIN_VALUE SW_TERRAIN_VALUE S_TERRAIN_VALUE SE_TERRAIN_VALUE C_FLAGS NW_FLAGS N_FLAGS NE_FLAGS SW_FLAGS S_FLAGS SE_FLAGS LAYER IMAGE
    [terrain_graphics]
        map="
, 3
2,  4
, 1
5,  7
, 6"
        [tile]
            pos=1
            type={C_TERRAIN_VALUE}
            set_no_flag={C_FLAGS}
        [/tile]
        [tile]
            pos=2
            type={NW_TERRAIN_VALUE}
            set_no_flag={NW_FLAGS}
        [/tile]
        [tile]
            pos=3
            type={N_TERRAIN_VALUE}
            set_no_flag={N_FLAGS}
        [/tile]
        [tile]
            pos=4
            type={NE_TERRAIN_VALUE}
            set_no_flag={NE_FLAGS}
        [/tile]
        [tile]
            pos=5
            type={SW_TERRAIN_VALUE}
            set_no_flag={SW_FLAGS}
        [/tile]
        [tile]
            pos=6
            type={S_TERRAIN_VALUE}
            set_no_flag={S_FLAGS}
        [/tile]
        [tile]
            pos=7
            type={SE_TERRAIN_VALUE}
            set_no_flag={SE_FLAGS}
        [/tile]
        [image]
            center=90,144
            base=90,144
            layer={LAYER}
            name={IMAGE}.png
        [/image]
    [/terrain_graphics]
#enddef

#define BRIDGE:STRAIGHT_SE_NW NW_TERRAIN_VALUE SE_TERRAIN_VALUE N_TERRAIN_VALUE S_TERRAIN_VALUE NW_FLAGS SE_FLAGS LAYER IMAGE
    [terrain_graphics]
        map="
, 3
1
, 2
4"
        [tile]
            pos=1
            type={NW_TERRAIN_VALUE}
            set_no_flag={NW_FLAGS}
        [/tile]
        [tile]
            pos=2
            type={SE_TERRAIN_VALUE}
            set_no_flag={SE_FLAGS}
        [/tile]
        [tile]
            pos=3
            type={N_TERRAIN_VALUE}
        [/tile]
        [tile]
            pos=4
            type={S_TERRAIN_VALUE}
        [/tile]
        [image]
            center=63,126
            base=63,126
            layer={LAYER}
            name={IMAGE}.png
        [/image]
    [/terrain_graphics]
#enddef

#define BRIDGE:STRAIGHT_SW_NE NE_TERRAIN_VALUE SW_TERRAIN_VALUE N_TERRAIN_VALUE S_TERRAIN_VALUE NE_FLAGS SW_FLAGS LAYER IMAGE
    [terrain_graphics]
        map="
3
, 1
2
, 4"
        [tile]
            pos=1
            type={NE_TERRAIN_VALUE}
            set_no_flag={NE_FLAGS}
        [/tile]
        [tile]
            pos=2
            type={SW_TERRAIN_VALUE}
            set_no_flag={SW_FLAGS}
        [/tile]
        [tile]
            pos=3
            type={N_TERRAIN_VALUE}
        [/tile]
        [tile]
            pos=4
            type={S_TERRAIN_VALUE}
        [/tile]
        [image]
            center=63,90
            base=63,90
            layer={LAYER}
            name={IMAGE}.png
        [/image]
    [/terrain_graphics]
#enddef

#define BRIDGE:STRAIGHT_S_N N_TERRAIN_VALUE S_TERRAIN_VALUE W_TERRAIN_VALUE E_TERRAIN_VALUE N_FLAGS S_FLAGS LAYER IMAGE
    [terrain_graphics]
        map="
, 1
3, 4
, 2"
        [tile]
            pos=1
            type={N_TERRAIN_VALUE}
            set_no_flag={N_FLAGS}
        [/tile]
        [tile]
            pos=2
            type={S_TERRAIN_VALUE}
            set_no_flag={S_FLAGS}
        [/tile]
        [tile]
            pos=3
            type={W_TERRAIN_VALUE}
        [/tile]
        [tile]
            pos=4
            type={E_TERRAIN_VALUE}
        [/tile]
        [image]
            center=90,108
            base=90,108
            layer={LAYER}
            name={IMAGE}.png
        [/image]
    [/terrain_graphics]
#enddef

#define BRIDGE:JOINTS NW_SE_OVERLAY N_S_OVERLAY NE_SW_OVERLAY B_TERRAIN_NAME S_TERRAIN_NAME NAME LAYER IMAGE_GROUP_NAME
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{N_S_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) * *^{N_S_OVERLAY} * *^{NE_SW_OVERLAY} {S_TERRAIN_NAME} *^{NW_SE_OVERLAY}           ({NAME}-[n,se,sw,ne,s,nw]) () {NAME}-s () {NAME}-ne () {NAME}-nw {LAYER} {IMAGE_GROUP_NAME}-n-se-sw}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{N_S_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} {S_TERRAIN_NAME} *^{N_S_OVERLAY} {S_TERRAIN_NAME} ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () {NAME}-n () {LAYER} {IMAGE_GROUP_NAME}-ne-s-nw}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{N_S_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} {S_TERRAIN_NAME} *^{N_S_OVERLAY} *           ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () {NAME}-n () {LAYER} {IMAGE_GROUP_NAME}-ne-s-nw-l}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{N_S_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} *           *^{N_S_OVERLAY} {S_TERRAIN_NAME} ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () {NAME}-n () {LAYER} {IMAGE_GROUP_NAME}-ne-s-nw-r}
#enddef

#define BRIDGE:CORNERS NW_SE_OVERLAY N_S_OVERLAY NE_SW_OVERLAY B_TERRAIN_NAME S_TERRAIN_NAME NAME LAYER IMAGE_GROUP_NAME
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{N_S_OVERLAY})   *^{NW_SE_OVERLAY} * *                 {S_TERRAIN_NAME}       *^{N_S_OVERLAY}   *                 ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () () () {NAME}-n ()  {LAYER} {IMAGE_GROUP_NAME}-s-nw}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{N_S_OVERLAY})   *                 *^{N_S_OVERLAY}   * *                 {S_TERRAIN_NAME}       *^{NW_SE_OVERLAY} ({NAME}-[n,se,sw,ne,s,nw]) () {NAME}-s () () () {NAME}-nw  {LAYER} {IMAGE_GROUP_NAME}-n-se}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NE_SW_OVERLAY},{B_TERRAIN_NAME}^{N_S_OVERLAY})   *                 * *^{NE_SW_OVERLAY} *                 *^{N_S_OVERLAY}   {S_TERRAIN_NAME}       ({NAME}-[n,se,sw,ne,s,nw]) () () {NAME}-sw () {NAME}-n ()  {LAYER} {IMAGE_GROUP_NAME}-ne-s}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NE_SW_OVERLAY},{B_TERRAIN_NAME}^{N_S_OVERLAY})   *                 *^{N_S_OVERLAY}   * *^{NE_SW_OVERLAY} {S_TERRAIN_NAME}       *                 ({NAME}-[n,se,sw,ne,s,nw]) () {NAME}-s () {NAME}-ne () ()  {LAYER} {IMAGE_GROUP_NAME}-sw-n}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *                 * *                 *^{NE_SW_OVERLAY} {S_TERRAIN_NAME}       *^{NW_SE_OVERLAY} ({NAME}-[n,se,sw,ne,s,nw]) () () () {NAME}-ne () {NAME}-nw {LAYER} {IMAGE_GROUP_NAME}-sw-se}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} {S_TERRAIN_NAME}       {S_TERRAIN_NAME}       {S_TERRAIN_NAME}       ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () () () {LAYER} {IMAGE_GROUP_NAME}-ne-nw}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} {S_TERRAIN_NAME}       {S_TERRAIN_NAME}       *                 ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () () () {LAYER} {IMAGE_GROUP_NAME}-ne-nw-lc}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} {S_TERRAIN_NAME}       *                 {S_TERRAIN_NAME}       ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () () () {LAYER} {IMAGE_GROUP_NAME}-ne-nw-lr}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} *                 {S_TERRAIN_NAME}       {S_TERRAIN_NAME}       ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () () () {LAYER} {IMAGE_GROUP_NAME}-ne-nw-cr}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} {S_TERRAIN_NAME}       *                 *                 ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () () () {LAYER} {IMAGE_GROUP_NAME}-ne-nw-l}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} *                 {S_TERRAIN_NAME}       *                 ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () () () {LAYER} {IMAGE_GROUP_NAME}-ne-nw-c}
    {BRIDGE:NEXUS ({B_TERRAIN_NAME}^{NW_SE_OVERLAY},{B_TERRAIN_NAME}^{NE_SW_OVERLAY}) *^{NW_SE_OVERLAY} * *^{NE_SW_OVERLAY} *                 *                 {S_TERRAIN_NAME}       ({NAME}-[n,se,sw,ne,s,nw]) {NAME}-se () {NAME}-sw () () () {LAYER} {IMAGE_GROUP_NAME}-ne-nw-r}
#enddef

#define BRIDGE:STRAIGHTS NW_SE_OVERLAY N_S_OVERLAY NE_SW_OVERLAY BN_TERRAIN_NAME BS_TERRAIN_NAME S_TERRAIN_NAME NAME LAYER IMAGE_GROUP_NAME
    {BRIDGE:STRAIGHT_SE_NW {BN_TERRAIN_NAME}^{NW_SE_OVERLAY} {BS_TERRAIN_NAME}^{NW_SE_OVERLAY} * {S_TERRAIN_NAME} {NAME}-se {NAME}-nw {LAYER} {IMAGE_GROUP_NAME}-se-nw}
    {BRIDGE:STRAIGHT_S_N   {BN_TERRAIN_NAME}^{N_S_OVERLAY}   {BS_TERRAIN_NAME}^{N_S_OVERLAY}   * *           {NAME}-s  {NAME}-n  {LAYER} {IMAGE_GROUP_NAME}-s-n}
    {BRIDGE:STRAIGHT_SW_NE {BN_TERRAIN_NAME}^{NE_SW_OVERLAY} {BS_TERRAIN_NAME}^{NE_SW_OVERLAY} * {S_TERRAIN_NAME} {NAME}-sw {NAME}-ne {LAYER} {IMAGE_GROUP_NAME}-sw-ne}
#enddef

#define BRIDGE:ENDS NW_SE_OVERLAY N_S_OVERLAY NE_SW_OVERLAY B_TERRAIN_NAME E_TERRAIN_NAME S_TERRAIN_NAME NAME LAYER IMAGE_GROUP_NAME
    {BRIDGE:STRAIGHT_SE_NW {B_TERRAIN_NAME}^{NW_SE_OVERLAY} {E_TERRAIN_NAME}                 * {S_TERRAIN_NAME} {NAME}-se () {LAYER} {IMAGE_GROUP_NAME}-nw}
    {BRIDGE:STRAIGHT_SE_NW {E_TERRAIN_NAME}                 {B_TERRAIN_NAME}^{NW_SE_OVERLAY} * {S_TERRAIN_NAME} () {NAME}-nw {LAYER} {IMAGE_GROUP_NAME}-se}
    {BRIDGE:STRAIGHT_S_N   {B_TERRAIN_NAME}^{N_S_OVERLAY}   {E_TERRAIN_NAME}                 * *           {NAME}-s  () {LAYER} {IMAGE_GROUP_NAME}-n}
    {BRIDGE:STRAIGHT_S_N   {E_TERRAIN_NAME}                 {B_TERRAIN_NAME}^{N_S_OVERLAY}   * *           ()  {NAME}-n {LAYER} {IMAGE_GROUP_NAME}-s}
    {BRIDGE:STRAIGHT_SW_NE {B_TERRAIN_NAME}^{NE_SW_OVERLAY} {E_TERRAIN_NAME}                 * {S_TERRAIN_NAME} {NAME}-sw () {LAYER} {IMAGE_GROUP_NAME}-ne}
    {BRIDGE:STRAIGHT_SW_NE {E_TERRAIN_NAME}                 {B_TERRAIN_NAME}^{NE_SW_OVERLAY} * {S_TERRAIN_NAME} () {NAME}-ne {LAYER} {IMAGE_GROUP_NAME}-sw}
#enddef