372 lines
9.2 KiB
Text
372 lines
9.2 KiB
Text
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# Parse an xml file into a canvas group element
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#
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# @param group The canvas.Group instance to append the parsed elements to
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# @param path The path of the svg file (absolute or relative to FG_ROOT)
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var parsesvg = func(group, path)
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{
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if( !isa(group, Group) )
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die("Invalid argument group (type != Group)");
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var level = 0;
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var skip = 0;
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var stack = [group];
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# ----------------------------------------------------------------------------
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# Parse a transformation (matrix)
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# http://www.w3.org/TR/SVG/coords.html#TransformAttribute
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var parseTransform = func(tf)
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{
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if( tf == nil )
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return;
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tf = std.string.new(tf);
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var end = 0;
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while(1)
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{
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var start_type = tf.find_first_not_of("\t\n ", end);
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if( start_type < 0 )
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break;
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var end_type = tf.find_first_of("(\t\n ", start_type + 1);
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if( end_type < 0 )
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break;
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var start_args = tf.find('(', end_type);
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if( start_args < 0 )
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break;
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var values = [];
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end = start_args;
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while(1)
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{
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var start_num = tf.find_first_not_of(",\t\n ", end + 1);
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if( start_num < 0 )
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break;
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if( tf[start_num] == ')' )
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break;
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end = tf.find_first_of("),\t\n ", start_num + 1);
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if( end < 0 )
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break;
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append(values, tf.substr(start_num, end - start_num));
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}
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var type = tf.substr(start_type, end_type - start_type);
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if( type == "translate" )
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# translate(<tx> [<ty>]), which specifies a translation by tx and ty. If
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# <ty> is not provided, it is assumed to be zero.
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stack[-1].createTransform().setTranslation
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(
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values[0],
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size(values) > 1 ? values[1] : 0,
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);
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else if( type == "matrix" )
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{
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if( size(values) == 6 )
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stack[-1].createTransform(values);
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else
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debug.dump('invalid transform', type, values);
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}
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else
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debug.dump(['unknown transform', type, values]);
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}
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};
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# ----------------------------------------------------------------------------
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# Parse a path
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# http://www.w3.org/TR/SVG/paths.html#PathData
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# map svg commands OpenVG commands
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var cmd_map = {
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z: Path.VG_CLOSE_PATH,
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m: Path.VG_MOVE_TO,
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l: Path.VG_LINE_TO,
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h: Path.VG_HLINE_TO,
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v: Path.VG_VLINE_TO,
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q: Path.VG_QUAD_TO,
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c: Path.VG_CUBIC_TO,
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t: Path.VG_SQUAD_TO,
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s: Path.VG_SCUBIC_TO
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};
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var parsePath = func(d)
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{
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if( d == nil )
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return;
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var path_data = std.string.new(d);
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var pos = 0;
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var cmds = [];
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var coords = [];
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while(1)
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{
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# skip trailing spaces
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pos = path_data.find_first_not_of("\t\n ", pos);
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if( pos < 0 )
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break;
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# get command
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var cmd = path_data.substr(pos, 1);
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pos += 1;
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# and get all following arguments
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var args = [];
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while(1)
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{
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pos = path_data.find_first_not_of(",\t\n ", pos);
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if( pos < 0 )
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break;
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var start_num = pos;
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pos = path_data.find_first_not_of("e-.0123456789", start_num);
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if( start_num == pos )
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break;
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append(args, path_data.substr(start_num, pos > 0 ? pos - start_num : nil));
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}
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# now execute the command
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var rel = string.islower(cmd[0]);
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var cmd = string.lc(cmd);
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if( cmd == 'a' )
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{
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for(var i = 0; i + 7 <= size(args); i += 7)
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{
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# SVG: (rx ry x-axis-rotation large-arc-flag sweep-flag x y)+
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# OpenVG: rh,rv,rot,x0,y0
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if( args[i + 3] )
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var cmd_vg = args[i + 4] ? Path.VG_LCCWARC_TO : Path.VG_LCWARC_TO;
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else
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var cmd_vg = args[i + 4] ? Path.VG_SCCWARC_TO : Path.VG_SCWARC_TO;
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append(cmds, rel ? cmd_vg + 1: cmd_vg);
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append(coords, args[i],
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args[i + 1],
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args[i + 2],
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args[i + 5],
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args[i + 6] );
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}
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if( math.mod(size(args), 7) > 0 )
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debug.dump('too much coords for cmd', cmd, args);
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}
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else
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{
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var cmd_vg = cmd_map[cmd];
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if( cmd_vg == nil )
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{
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debug.dump('command not found', cmd, args);
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continue;
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}
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var num_coords = Path.num_coords[int(cmd_vg)];
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if( num_coords == 0 )
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append(cmds, cmd_vg);
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else
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{
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for(var i = 0; i + num_coords <= size(args); i += num_coords)
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{
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append(cmds, rel ? cmd_vg + 1: cmd_vg);
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for(var j = i; j < i + num_coords; j += 1)
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append(coords, args[j]);
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# If a moveto is followed by multiple pairs of coordinates, the
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# subsequent pairs are treated as implicit lineto commands.
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if( cmd == 'm' )
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cmd_vg = cmd_map['l'];
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}
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if( math.mod(size(args), num_coords) > 0 )
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debug.warn('too much coords for cmd: ' ~ cmd);
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}
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}
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}
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stack[-1].setData(cmds, coords);
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};
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# ----------------------------------------------------------------------------
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# Parse a css style attribute
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var parseStyle = func(style)
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{
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if( style == nil )
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return {};
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var styles = {};
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foreach(var part; split(';', style))
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{
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if( !size(part = string.trim(part)) )
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continue;
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if( size(part = split(':',part)) != 2 )
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continue;
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var key = string.trim(part[0]);
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if( !size(key) )
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continue;
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var value = string.trim(part[1]);
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if( !size(value) )
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continue;
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styles[key] = value;
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}
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return styles;
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}
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# ----------------------------------------------------------------------------
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# Parse a css color
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var parseColor = func(s)
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{
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var color = [0, 0, 0];
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if( s == nil )
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return color;
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if( size(s) == 7 and substr(s, 0, 1) == '#' )
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{
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return [ std.stoul(substr(s, 1, 2), 16) / 255,
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std.stoul(substr(s, 3, 2), 16) / 255,
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std.stoul(substr(s, 5, 2), 16) / 255 ];
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}
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return color;
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};
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# ----------------------------------------------------------------------------
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# XML parsers element open callback
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var start = func(name, attr)
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{
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level += 1;
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if( skip )
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return;
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if( level == 1 )
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{
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if( name != 'svg' )
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die("Not an svg file (root=" ~ name ~ ")");
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else
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return;
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}
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var style = parseStyle(attr['style']);
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if( style['display'] == 'none' )
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{
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skip = level - 1;
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return;
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}
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else if( name == "g" )
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{
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append(stack, stack[-1].createChild('group', attr['id']));
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}
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else if( name == "text" )
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{
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append(stack, stack[-1].createChild('text', attr['id']));
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stack[-1].setTranslation(attr['x'], attr['y']);
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# http://www.w3.org/TR/SVG/text.html#TextAnchorProperty
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var h_align = style["text-anchor"];
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if( h_align == "end" )
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h_align = "right";
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else if( h_align == "middle" )
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h_align = "center";
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else # "start"
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h_align = "left";
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stack[-1].setAlignment(h_align ~ "-baseline");
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# TODO vertical align
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stack[-1].setColor(parseColor(style['fill']));
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stack[-1].setFont("UbuntuMono-B.ttf");
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#stack[-1].setFont("LiberationFonts/LiberationMono-Bold.ttf");
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}
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else if( name == "path" or name == "rect" )
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{
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append(stack, stack[-1].createChild('path', attr['id']));
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var d = attr['d'];
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if( name == "rect" )
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{
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var width = attr['width'];
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var height = attr['height'];
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var x = attr['x'];
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var y = attr['y'];
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d = sprintf("M%f,%f v%f h%f v%fz", x, y, height, width, -height);
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}
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parsePath(d);
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var w = style['stroke-width'];
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stack[-1].setStrokeLineWidth( w != nil ? w : 1 );
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stack[-1].setColor(parseColor(style['stroke']));
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var fill = style['fill'];
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if( fill != nil and fill != "none" )
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{
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stack[-1].setColorFill(parseColor(fill));
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stack[-1].setFill(1);
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}
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# http://www.w3.org/TR/SVG/painting.html#StrokeDasharrayProperty
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var dash = style['stroke-dasharray'];
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if( dash and size(dash) > 3 )
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# at least 2 comma separated values...
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stack[-1].setStrokeDashPattern(split(',', dash));
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}
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else if( name == "tspan" )
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{
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return;
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}
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else
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{
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print("parsesvg: skipping unknown element '" ~ name ~ "'");
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skip = level;
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return;
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}
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parseTransform(attr['transform']);
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};
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# XML parsers element close callback
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var end = func(name)
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{
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level -= 1;
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if( skip )
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{
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if( level <= skip )
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skip = 0;
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return;
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}
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if( name == 'g' or name == 'text' or name == 'path' or name == 'rect' )
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pop(stack);
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};
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# XML parsers element data callback
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var data = func(data)
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{
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if( skip )
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return;
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if( size(data) and isa(stack[-1], Text) )
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stack[-1].setText(data);
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};
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if( path[0] != '/' )
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path = getprop("/sim/fg-root") ~ "/" ~ path;
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call(func parsexml(path, start, end, data), nil, var err = []);
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if( size(err) )
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{
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debug.dump(err);
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return 0;
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}
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return 1;
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}
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