| 1 | ================================================================================ |
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| 2 | ================================================================================ |
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| 3 | Protocol for geovis render server. |
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| 4 | |
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| 5 | Commands take the general form of command and arguments using Tcl syntax and are |
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| 6 | terminated by a newline. Some command arguments expect a Tcl list which can be |
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| 7 | sent by enclosing the list in curly braces to prevent the interpreter from |
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| 8 | splitting the list into multiple arguments. Likewise, strings with spaces |
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| 9 | should be quoted or enclosed in curly braces. In the documentation below, |
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| 10 | arguments are indicated by angle brackets and optional arguments are surrounded |
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| 11 | by question marks -- the brackets and question marks are not part of the |
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| 12 | protocol and should not be included in argument strings. The arguments shown |
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| 13 | in angle brackets should be replaced with a string (where there are fixed |
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| 14 | choices this document indicates valid values by separating them with pipe |
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| 15 | symbols), a list in Tcl syntax, or a numeric value. Boolean arguments can take |
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| 16 | the form of 0|1, true|false, or yes|no. Since the protocol commands are |
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| 17 | executed in a Tcl interpreter, Tcl code such as math expressions in expr |
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| 18 | commands enclosed in square brackets are also allowed. Since the interpreter |
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| 19 | is a "safe" interpreter, some Tcl commands that could cause security issues may |
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| 20 | not be available for use. |
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| 21 | |
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| 22 | When binary data is to be sent, it should follow the newline after a command |
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| 23 | that indicates incoming data including a byte count argument. |
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| 24 | ================================================================================ |
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| 25 | ================================================================================ |
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| 26 | Requests: |
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| 27 | ================================================================================ |
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| 28 | |
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| 29 | == General dataset, scene and renderer commands == |
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| 30 | |
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| 31 | camera delete <name> |
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| 32 | Delete named viewpoint |
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| 33 | camera dist <distance> |
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| 34 | Set camera distance from focal point |
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| 35 | camera get |
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| 36 | Request camera parameters |
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| 37 | camera go <x> <y> <?zoomFactor?> <?duration?> |
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| 38 | Move camera to new focal point. |
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| 39 | <x>,<y> = Screen/mouse coordinates |
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| 40 | <zoomFactor> = Zoom distance multiplier, 1.0=no zoom |
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| 41 | <duration> = Duration of viewpoint move animation in seconds |
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| 42 | camera orient <quatW> <quatX> <quatY> <quatZ> |
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| 43 | Set scene orientation using a quaternion |
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| 44 | camera pan <x> <y> |
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| 45 | <x,y> viewport coordinates (window center at 0,0). Positive x pan |
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| 46 | means pan object to right (camera to left). Positive y pan means |
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| 47 | pan object down (camera up). For example a pan of 0.5, 0.5 would |
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| 48 | move the object center to the lower right corner of the window |
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| 49 | camera reset <?all?> |
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| 50 | Option all resets orientation/rotation as well as pan/zoom/clip range |
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| 51 | camera restore <name> <?duration?> |
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| 52 | Set viewpoint to a named viewpoint, with optional animation duration in seconds |
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| 53 | camera rotate <x> <y> |
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| 54 | Specify relative rotation in viewport coordinates |
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| 55 | camera save <name> |
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| 56 | Save current viewpoint to a named viewpoint |
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| 57 | camera set <x> <y> <z> <heading> <pitch> <distance> <?duration?> <?srs?> <?vertDatum?> |
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| 58 | Explicitly set camera parameters, with optional animation duration in seconds |
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| 59 | <x>, <y> = Map coordinates of focal point |
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| 60 | <z> = Altitude of focal point (see vertDatum) |
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| 61 | <heading> = Azimuth in degrees |
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| 62 | <pitch> = Elevation in degrees |
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| 63 | <distance> = Distance of camera from focal point in map units(?) |
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| 64 | <srs> = coordinate system, defaults to map coordinate system |
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| 65 | <vertDatum> = vertical datum for interpreting z coordinate |
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| 66 | camera zoom <y> |
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| 67 | Specify zoom by viewport coordinates (i.e. normalized y mouse coords) |
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| 68 | |
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| 69 | clientinfo <list> |
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| 70 | |
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| 71 | key press <key> |
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| 72 | key release <key> |
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| 73 | |
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| 74 | mouse click <button> <x> <y> |
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| 75 | mouse dblclick <button> <x> <y> |
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| 76 | mouse drag <button> <x> <y> |
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| 77 | mouse motion <x> <y> |
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| 78 | mouse release <button> <x> <y> |
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| 79 | mouse scroll <direction> |
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| 80 | |
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| 81 | renderer render |
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| 82 | Force a new image to be rendered |
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| 83 | |
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| 84 | screen bgcolor <r> <g> <b> |
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| 85 | screen size <width> <height> |
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| 86 | |
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| 87 | map coords <x> <y> |
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| 88 | Translate screen/mouse coordinates into map coordinates |
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| 89 | |
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| 90 | General form: |
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| 91 | map layer add <type> <driver> <url> ... <layerName> |
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| 92 | <type> = image|elevation|line|point|polygon|text |
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| 93 | <driver> = gdal|wms|tms|xyz |
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| 94 | |
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| 95 | Specific layer types: |
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| 96 | map layer add image gdal <url> <layerName> |
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| 97 | Add a GDAL image layer from a file or URL |
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| 98 | map layer add image wms <url> <layers> <format> <transparent> <layerName> |
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| 99 | Add a WMS image layer from a URL + layer string |
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| 100 | <url> = URL of WMS service |
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| 101 | <layers> = layers string for WMS server |
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| 102 | <format> = Image format to return (e.g. 'png') |
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| 103 | <transparent> = bool |
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| 104 | map layer add image tms <url> <layerName> |
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| 105 | Add a TMS image layer from a URL |
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| 106 | <url> = URL of TMS service |
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| 107 | map layer add elevation <driver> <url> <layerName> |
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| 108 | Add an elevation image layer from a file or URL |
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| 109 | <driver> = gdal|tms|wms |
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| 110 | map layer add point <url> <layerName> |
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| 111 | Add a point feature layer from a file or URL |
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| 112 | map layer add polygon <url> <layerName> |
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| 113 | Add a polygon feature layer from a file or URL |
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| 114 | map layer add line <url> <layerName> |
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| 115 | Add a line feature layer from a file or URL |
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| 116 | map layer add text <url> <layerName> |
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| 117 | Add a text symbol layer from a file or URL |
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| 118 | |
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| 119 | map layer delete <layerName> |
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| 120 | map layer opacity <opacity> <layerName> |
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| 121 | map layer move <pos> <layerName> |
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| 122 | map layer visible <bool> <layerName> |
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| 123 | map load data follows <nbytes> |
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| 124 | Send an .earth file over the wire |
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| 125 | map load file <path> |
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| 126 | Load an .earth file from a filesystem mounted on the server |
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| 127 | map load url <url> |
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| 128 | Load an .earth file from a network address |
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| 129 | map reset <type> <?profile?> <?xmin?> <?ymin?> <?xmax?> <?ymax?> |
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| 130 | Clear the scene and rebuild a new map from scratch. When resetting the |
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| 131 | map to geocentric, a profile and extents should be omitted. When the map |
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| 132 | type is projected, the profile is required and extents are optional. |
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| 133 | type = geocentric|projected |
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| 134 | profile = Well known profile string, e.g. 'global-geodetic', |
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| 135 | 'global-mercator'. If specifying bounds (i.e. not global), use 'geodetic' |
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| 136 | or 'spherical-mercator' or an SRS init string (such as an EPSG code) |
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| 137 | xmin,ymin,xmax,ymax = map bounds (in profile projection/units) |
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| 138 | |
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| 139 | ================================================================================ |
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| 140 | Replies: |
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| 141 | ================================================================================ |
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| 142 | nv>image -type image -bytes <nbytes> |
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| 143 | <binary RGB data> |
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| 144 | nv>dataset coords <x> <y> <z> |
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| 145 | nv>ok -token <seqnum> |
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| 146 | Reply indicated commands through <seqnum> (numbered beginning at 1) have been |
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| 147 | processed, but no new image was rendered |
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| 148 | ================================================================================ |
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| 149 | Error Replies: |
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| 150 | ================================================================================ |
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| 151 | nv>viserror -bytes <nbytes> |
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| 152 | <multi-line error string of nbytes> |
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| 153 | ================================================================================ |
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