Index: doc/developer/data1.png
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+++ doc/developer/data1.png	(nonexistent)

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Index: doc/developer/data.html
===================================================================
--- doc/developer/data.html	(revision 20858)
+++ doc/developer/data.html	(revision 20859)
@@ -138,7 +138,7 @@
 Relevant structs, variables and functions are in layer.[ch].
 
 <h2> map </h2>
-<img src="data1.png">
+<img src="data1.svg">
 
 
 <h2> tree </h2>
Index: doc/developer/data1.svg
===================================================================
--- doc/developer/data1.svg	(nonexistent)
+++ doc/developer/data1.svg	(revision 20859)
@@ -0,0 +1,349 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.38.0 (20140413.2041)
+ -->
+<!-- Title: pcb_data Pages: 1 -->
+<svg width="1095pt" height="1404pt"
+ viewBox="0.00 0.00 1094.57 1403.57" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 1399.57)">
+<title>pcb_data</title>
+<polygon fill="white" stroke="none" points="-4,4 -4,-1399.57 1090.57,-1399.57 1090.57,4 -4,4"/>
+<g id="clust1" class="cluster"><title>cluster_1</title>
+<polygon fill="grey" stroke="black" points="474,-8 474,-123 1015,-123 1015,-8 474,-8"/>
+<text text-anchor="middle" x="744.5" y="-107.8" font-family="Times,serif" font-size="14.00">LEGEND</text>
+</g>
+<!-- PCBType_misc -->
+<g id="node1" class="node"><title>PCBType_misc</title>
+<ellipse fill="none" stroke="black" cx="281" cy="-900.63" rx="71.3357" ry="132.872"/>
+<text text-anchor="middle" x="281" y="-979.43" font-family="Times,serif" font-size="14.00">misc fields:</text>
+<text text-anchor="middle" x="281" y="-964.43" font-family="Times,serif" font-size="14.00">ID</text>
+<text text-anchor="middle" x="281" y="-949.43" font-family="Times,serif" font-size="14.00">Name</text>
+<text text-anchor="middle" x="281" y="-934.43" font-family="Times,serif" font-size="14.00">FileName</text>
+<text text-anchor="middle" x="281" y="-919.43" font-family="Times,serif" font-size="14.00">colors</text>
+<text text-anchor="middle" x="281" y="-904.43" font-family="Times,serif" font-size="14.00">drc settings</text>
+<text text-anchor="middle" x="281" y="-889.43" font-family="Times,serif" font-size="14.00">cursor coords</text>
+<text text-anchor="middle" x="281" y="-874.43" font-family="Times,serif" font-size="14.00">grid</text>
+<text text-anchor="middle" x="281" y="-859.43" font-family="Times,serif" font-size="14.00">layergroups</text>
+<text text-anchor="middle" x="281" y="-844.43" font-family="Times,serif" font-size="14.00">route styles</text>
+<text text-anchor="middle" x="281" y="-829.43" font-family="Times,serif" font-size="14.00">padstack protos</text>
+<text text-anchor="middle" x="281" y="-814.43" font-family="Times,serif" font-size="14.00">...</text>
+</g>
+<!-- PCBType_flags -->
+<g id="node2" class="node"><title>PCBType_flags</title>
+<ellipse fill="none" stroke="black" cx="463" cy="-900.63" rx="92.7622" ry="48.1667"/>
+<text text-anchor="middle" x="463" y="-919.43" font-family="Times,serif" font-size="14.00">flags:</text>
+<text text-anchor="middle" x="463" y="-904.43" font-family="Times,serif" font-size="14.00">Changed</text>
+<text text-anchor="middle" x="463" y="-889.43" font-family="Times,serif" font-size="14.00">ViaOn (vias drawn?)</text>
+<text text-anchor="middle" x="463" y="-874.43" font-family="Times,serif" font-size="14.00">...</text>
+</g>
+<!-- pcb_board_t -->
+<g id="node3" class="node"><title>pcb_board_t</title>
+<polygon fill="none" stroke="black" points="500,-1164.57 416,-1164.57 416,-1128.57 500,-1128.57 500,-1164.57"/>
+<text text-anchor="middle" x="458" y="-1142.87" font-family="Times,serif" font-size="14.00">pcb_board_t</text>
+</g>
+<!-- pcb_board_t&#45;&gt;PCBType_misc -->
+<g id="edge1" class="edge"><title>pcb_board_t&#45;&gt;PCBType_misc</title>
+<path fill="none" stroke="black" d="M441.584,-1128.48C421.475,-1107.15 386.894,-1069.12 361,-1033.57 353.398,-1023.13 345.821,-1011.94 338.531,-1000.66"/>
+<polygon fill="black" stroke="black" points="341.348,-998.565 333.016,-992.021 335.449,-1002.33 341.348,-998.565"/>
+</g>
+<!-- pcb_board_t&#45;&gt;PCBType_flags -->
+<g id="edge2" class="edge"><title>pcb_board_t&#45;&gt;PCBType_flags</title>
+<path fill="none" stroke="black" d="M458.352,-1128.41C459.062,-1093.77 460.695,-1014.09 461.823,-959.047"/>
+<polygon fill="black" stroke="black" points="465.329,-958.8 462.035,-948.731 458.33,-958.657 465.329,-958.8"/>
+</g>
+<!-- pcb_data_t -->
+<g id="node4" class="node"><title>pcb_data_t</title>
+<polygon fill="none" stroke="black" points="669,-918.63 593,-918.63 593,-882.63 669,-882.63 669,-918.63"/>
+<text text-anchor="middle" x="631" y="-896.93" font-family="Times,serif" font-size="14.00">pcb_data_t</text>
+</g>
+<!-- pcb_board_t&#45;&gt;pcb_data_t -->
+<g id="edge3" class="edge"><title>pcb_board_t&#45;&gt;pcb_data_t</title>
+<path fill="none" stroke="black" d="M477.612,-1128.43C500.592,-1107.64 538.846,-1070.73 565,-1033.57 588.892,-999.614 608.988,-955.762 620.517,-928.159"/>
+<polygon fill="black" stroke="black" points="623.81,-929.353 624.368,-918.773 617.334,-926.696 623.81,-929.353"/>
+</g>
+<!-- DataType_listrt -->
+<g id="node18" class="node"><title>DataType_listrt</title>
+<ellipse fill="none" stroke="black" cx="222" cy="-645.823" rx="128.077" ry="18"/>
+<text text-anchor="middle" x="222" y="-642.123" font-family="Times,serif" font-size="14.00">layer&#45;independent lists and rtrees</text>
+</g>
+<!-- pcb_data_t&#45;&gt;DataType_listrt -->
+<g id="edge11" class="edge"><title>pcb_data_t:s&#45;&gt;DataType_listrt</title>
+<path fill="none" stroke="black" d="M631,-881.63C631,-823.109 610.049,-805.047 565,-767.693 522.296,-732.284 376.599,-688.534 289.428,-664.579"/>
+<polygon fill="black" stroke="black" points="290.188,-661.158 279.619,-661.899 288.343,-667.911 290.188,-661.158"/>
+</g>
+<!-- DataType_LayerN -->
+<g id="node19" class="node"><title>DataType_LayerN</title>
+<ellipse fill="none" stroke="black" cx="454" cy="-645.823" rx="86.0347" ry="26.7407"/>
+<text text-anchor="middle" x="454" y="-649.623" font-family="Times,serif" font-size="14.00">LayerN: number of</text>
+<text text-anchor="middle" x="454" y="-634.623" font-family="Times,serif" font-size="14.00">layers in use</text>
+</g>
+<!-- pcb_data_t&#45;&gt;DataType_LayerN -->
+<g id="edge9" class="edge"><title>pcb_data_t:s&#45;&gt;DataType_LayerN</title>
+<path fill="none" stroke="black" d="M631,-881.63C631,-792.953 549.506,-716.508 497.112,-676.525"/>
+<polygon fill="black" stroke="black" points="499.071,-673.619 488.97,-670.424 494.874,-679.221 499.071,-673.619"/>
+</g>
+<!-- DataType_layers -->
+<g id="node20" class="node"><title>DataType_layers</title>
+<ellipse fill="none" stroke="black" cx="631" cy="-645.823" rx="72.5877" ry="18"/>
+<text text-anchor="middle" x="631" y="-642.123" font-family="Times,serif" font-size="14.00">an array of layers</text>
+</g>
+<!-- pcb_data_t&#45;&gt;DataType_layers -->
+<g id="edge10" class="edge"><title>pcb_data_t:s&#45;&gt;DataType_layers</title>
+<path fill="none" stroke="black" d="M631,-881.63C631,-806.469 631,-717.776 631,-674.029"/>
+<polygon fill="black" stroke="black" points="634.5,-673.911 631,-663.911 627.5,-673.911 634.5,-673.911"/>
+</g>
+<!-- DataType_misc -->
+<g id="node21" class="node"><title>DataType_misc</title>
+<ellipse fill="none" stroke="black" cx="772" cy="-645.823" rx="50.0912" ry="18"/>
+<text text-anchor="middle" x="772" y="-642.123" font-family="Times,serif" font-size="14.00">misc fields</text>
+</g>
+<!-- pcb_data_t&#45;&gt;DataType_misc -->
+<g id="edge8" class="edge"><title>pcb_data_t:s&#45;&gt;DataType_misc</title>
+<path fill="none" stroke="black" d="M631,-881.63C631,-792.957 705.819,-708.875 746.454,-669.748"/>
+<polygon fill="black" stroke="black" points="748.991,-672.166 753.855,-662.754 744.183,-667.079 748.991,-672.166"/>
+</g>
+<!-- DataType_rtrees -->
+<g id="node22" class="node"><title>DataType_rtrees</title>
+<ellipse fill="none" stroke="black" cx="910" cy="-645.823" rx="69.5877" ry="18"/>
+<text text-anchor="middle" x="910" y="-642.123" font-family="Times,serif" font-size="14.00">DataType_rtrees</text>
+</g>
+<!-- pcb_data_t&#45;&gt;DataType_rtrees -->
+<g id="edge12" class="edge"><title>pcb_data_t:s&#45;&gt;DataType_rtrees</title>
+<path fill="none" stroke="black" d="M631,-881.63C631,-764.065 777.809,-693.507 858.438,-663.622"/>
+<polygon fill="black" stroke="black" points="859.722,-666.879 867.929,-660.178 857.335,-660.299 859.722,-666.879"/>
+</g>
+<!-- pcb_data_t2 -->
+<g id="node5" class="node"><title>pcb_data_t2</title>
+<text text-anchor="middle" x="51" y="-366.777" font-family="Times,serif" font-size="14.00">another level of</text>
+<text text-anchor="middle" x="51" y="-351.777" font-family="Times,serif" font-size="14.00">pcb_data_t</text>
+<text text-anchor="middle" x="51" y="-336.777" font-family="Times,serif" font-size="14.00">...</text>
+</g>
+<!-- pcb_subc_t -->
+<g id="node6" class="node"><title>pcb_subc_t</title>
+<polygon fill="#aaffaa" stroke="#aaffaa" points="90,-523.953 12,-523.953 12,-487.953 90,-487.953 90,-523.953"/>
+<text text-anchor="middle" x="51" y="-502.253" font-family="Times,serif" font-size="14.00">pcb_subc_t</text>
+</g>
+<!-- pcb_subc_t&#45;&gt;pcb_data_t2 -->
+<g id="edge18" class="edge"><title>pcb_subc_t&#45;&gt;pcb_data_t2</title>
+<path fill="none" stroke="black" d="M51,-487.921C51,-464.686 51,-422.481 51,-392.157"/>
+<polygon fill="black" stroke="black" points="54.5001,-391.977 51,-381.977 47.5001,-391.977 54.5001,-391.977"/>
+</g>
+<!-- pcb_rat_line_t -->
+<g id="node7" class="node"><title>pcb_rat_line_t</title>
+<polygon fill="#aaffaa" stroke="#aaffaa" points="203.5,-523.953 108.5,-523.953 108.5,-487.953 203.5,-487.953 203.5,-523.953"/>
+<text text-anchor="middle" x="156" y="-502.253" font-family="Times,serif" font-size="14.00">pcb_rat_line_t</text>
+</g>
+<!-- pcb_pstk_t -->
+<g id="node8" class="node"><title>pcb_pstk_t</title>
+<polygon fill="#aaffaa" stroke="#aaffaa" points="298,-523.953 222,-523.953 222,-487.953 298,-487.953 298,-523.953"/>
+<text text-anchor="middle" x="260" y="-502.253" font-family="Times,serif" font-size="14.00">pcb_pstk_t</text>
+</g>
+<!-- pcb_padstack_proto_t -->
+<g id="node9" class="node"><title>pcb_padstack_proto_t</title>
+<polygon fill="none" stroke="black" points="471,-523.953 335,-523.953 335,-487.953 471,-487.953 471,-523.953"/>
+<text text-anchor="middle" x="403" y="-502.253" font-family="Times,serif" font-size="14.00">pcb_padstack_proto_t</text>
+</g>
+<!-- pcb_pstk_t&#45;&gt;pcb_padstack_proto_t -->
+<g id="edge19" class="edge"><title>pcb_pstk_t&#45;&gt;pcb_padstack_proto_t</title>
+<path fill="none" stroke="blue" d="M298.321,-505.953C306.496,-505.953 315.415,-505.953 324.485,-505.953"/>
+<polygon fill="blue" stroke="blue" points="324.759,-509.453 334.759,-505.953 324.759,-502.453 324.759,-509.453"/>
+<text text-anchor="middle" x="316.5" y="-527.753" font-family="Times,serif" font-size="14.00">id</text>
+<text text-anchor="middle" x="316.5" y="-512.753" font-family="Times,serif" font-size="14.00">ref.</text>
+</g>
+<!-- pcb_arc_t -->
+<g id="node10" class="node"><title>pcb_arc_t</title>
+<polygon fill="#aaffaa" stroke="#aaffaa" points="459,-223 389,-223 389,-187 459,-187 459,-223"/>
+<text text-anchor="middle" x="424" y="-201.3" font-family="Times,serif" font-size="14.00">pcb_arc_t</text>
+</g>
+<!-- pcb_line_t -->
+<g id="node11" class="node"><title>pcb_line_t</title>
+<polygon fill="#aaffaa" stroke="#aaffaa" points="278,-223 204,-223 204,-187 278,-187 278,-223"/>
+<text text-anchor="middle" x="241" y="-201.3" font-family="Times,serif" font-size="14.00">pcb_line_t</text>
+</g>
+<!-- pcb_text_t -->
+<g id="node12" class="node"><title>pcb_text_t</title>
+<polygon fill="#aaffaa" stroke="#aaffaa" points="668,-223 594,-223 594,-187 668,-187 668,-223"/>
+<text text-anchor="middle" x="631" y="-201.3" font-family="Times,serif" font-size="14.00">pcb_text_t</text>
+</g>
+<!-- pcb_poly_t -->
+<g id="node13" class="node"><title>pcb_poly_t</title>
+<polygon fill="#aaffaa" stroke="#aaffaa" points="894.5,-223 817.5,-223 817.5,-187 894.5,-187 894.5,-223"/>
+<text text-anchor="middle" x="856" y="-201.3" font-family="Times,serif" font-size="14.00">pcb_poly_t</text>
+</g>
+<!-- struct -->
+<g id="node30" class="node"><title>struct</title>
+<polygon fill="none" stroke="black" points="883,-73 829,-73 829,-35 883,-35 883,-73"/>
+<text text-anchor="middle" x="856" y="-57.8" font-family="Times,serif" font-size="14.00">box:</text>
+<text text-anchor="middle" x="856" y="-42.8" font-family="Times,serif" font-size="14.00">struct</text>
+</g>
+<!-- pcb_poly_t&#45;&gt;struct -->
+<!-- PCB -->
+<g id="node14" class="node"><title>PCB</title>
+<polygon fill="none" stroke="black" points="449,-1395.57 298,-1327.57 449,-1259.57 600,-1327.57 449,-1395.57"/>
+<text text-anchor="middle" x="449" y="-1346.37" font-family="Times,serif" font-size="14.00">extern pcb_board_t PCB</text>
+<text text-anchor="middle" x="449" y="-1331.37" font-family="Times,serif" font-size="14.00">global variable</text>
+<text text-anchor="middle" x="449" y="-1316.37" font-family="Times,serif" font-size="14.00">holding the current</text>
+<text text-anchor="middle" x="449" y="-1301.37" font-family="Times,serif" font-size="14.00">board</text>
+</g>
+<!-- PCB&#45;&gt;pcb_board_t -->
+<g id="edge4" class="edge"><title>PCB&#45;&gt;pcb_board_t</title>
+<path fill="none" stroke="black" d="M452.3,-1260.93C453.792,-1231.26 455.473,-1197.82 456.621,-1174.99"/>
+<polygon fill="black" stroke="black" points="460.132,-1174.86 457.138,-1164.7 453.141,-1174.51 460.132,-1174.86"/>
+</g>
+<!-- Buffers -->
+<g id="node15" class="node"><title>Buffers</title>
+<polygon fill="none" stroke="black" points="795,-1380.57 618,-1327.57 795,-1274.57 972,-1327.57 795,-1380.57"/>
+<text text-anchor="middle" x="795" y="-1338.87" font-family="Times,serif" font-size="14.00">extern pcb_buffer_t Buffers[]</text>
+<text text-anchor="middle" x="795" y="-1323.87" font-family="Times,serif" font-size="14.00">global variable holding</text>
+<text text-anchor="middle" x="795" y="-1308.87" font-family="Times,serif" font-size="14.00">all paste buffers</text>
+</g>
+<!-- pcb_buffer_t -->
+<g id="node16" class="node"><title>pcb_buffer_t</title>
+<polygon fill="none" stroke="black" points="833,-1164.57 747,-1164.57 747,-1128.57 833,-1128.57 833,-1164.57"/>
+<text text-anchor="middle" x="790" y="-1142.87" font-family="Times,serif" font-size="14.00">pcb_buffer_t</text>
+</g>
+<!-- Buffers&#45;&gt;pcb_buffer_t -->
+<g id="edge5" class="edge"><title>Buffers&#45;&gt;pcb_buffer_t</title>
+<path fill="none" stroke="black" d="M793.554,-1274.79C792.641,-1242.12 791.499,-1201.24 790.76,-1174.78"/>
+<polygon fill="black" stroke="black" points="794.257,-1174.62 790.479,-1164.72 787.26,-1174.81 794.257,-1174.62"/>
+</g>
+<!-- pcb_buffer_t&#45;&gt;pcb_data_t -->
+<g id="edge7" class="edge"><title>pcb_buffer_t&#45;&gt;pcb_data_t</title>
+<path fill="none" stroke="black" d="M778.655,-1128.53C764.08,-1106.61 738.031,-1067.33 716,-1033.57 692.026,-996.822 664.584,-954.105 647.52,-927.465"/>
+<polygon fill="black" stroke="black" points="650.28,-925.284 641.94,-918.749 644.384,-929.058 650.28,-925.284"/>
+</g>
+<!-- BufferType_misc -->
+<g id="node17" class="node"><title>BufferType_misc</title>
+<ellipse fill="none" stroke="black" cx="790" cy="-900.63" rx="65.1077" ry="37.4533"/>
+<text text-anchor="middle" x="790" y="-911.93" font-family="Times,serif" font-size="14.00">misc fields:</text>
+<text text-anchor="middle" x="790" y="-896.93" font-family="Times,serif" font-size="14.00">bounding box</text>
+<text text-anchor="middle" x="790" y="-881.93" font-family="Times,serif" font-size="14.00">offset</text>
+</g>
+<!-- pcb_buffer_t&#45;&gt;BufferType_misc -->
+<g id="edge6" class="edge"><title>pcb_buffer_t&#45;&gt;BufferType_misc</title>
+<path fill="none" stroke="black" d="M790,-1128.41C790,-1091.53 790,-1003.59 790,-948.691"/>
+<polygon fill="black" stroke="black" points="793.5,-948.51 790,-938.51 786.5,-948.511 793.5,-948.51"/>
+</g>
+<!-- DataType_listrt&#45;&gt;pcb_subc_t -->
+<g id="edge14" class="edge"><title>DataType_listrt&#45;&gt;pcb_subc_t</title>
+<path fill="none" stroke="black" d="M201.032,-627.918C170.648,-603.421 114.271,-557.966 79.9451,-530.291"/>
+<polygon fill="black" stroke="black" points="82.1212,-527.549 72.1395,-523.997 77.7275,-532.999 82.1212,-527.549"/>
+</g>
+<!-- DataType_listrt&#45;&gt;pcb_rat_line_t -->
+<g id="edge15" class="edge"><title>DataType_listrt&#45;&gt;pcb_rat_line_t</title>
+<path fill="none" stroke="black" d="M213.775,-627.641C202.461,-604.008 181.993,-561.25 168.703,-533.49"/>
+<polygon fill="black" stroke="black" points="171.804,-531.861 164.329,-524.352 165.49,-534.883 171.804,-531.861"/>
+</g>
+<!-- DataType_listrt&#45;&gt;pcb_pstk_t -->
+<g id="edge16" class="edge"><title>DataType_listrt&#45;&gt;pcb_pstk_t</title>
+<path fill="none" stroke="black" d="M226.736,-627.641C233.193,-604.214 244.829,-561.996 252.484,-534.221"/>
+<polygon fill="black" stroke="black" points="255.921,-534.923 255.204,-524.352 249.173,-533.063 255.921,-534.923"/>
+</g>
+<!-- DataType_listrt&#45;&gt;pcb_padstack_proto_t -->
+<g id="edge17" class="edge"><title>DataType_listrt&#45;&gt;pcb_padstack_proto_t</title>
+<path fill="none" stroke="black" d="M244.194,-627.918C276.355,-603.421 336.029,-557.966 372.362,-530.291"/>
+<polygon fill="black" stroke="black" points="374.79,-532.841 380.624,-523.997 370.548,-527.272 374.79,-532.841"/>
+</g>
+<!-- pcb_layer_t -->
+<g id="node23" class="node"><title>pcb_layer_t</title>
+<polygon fill="none" stroke="black" points="671,-523.953 591,-523.953 591,-487.953 671,-487.953 671,-523.953"/>
+<text text-anchor="middle" x="631" y="-502.253" font-family="Times,serif" font-size="14.00">pcb_layer_t</text>
+</g>
+<!-- DataType_layers&#45;&gt;pcb_layer_t -->
+<g id="edge13" class="edge"><title>DataType_layers&#45;&gt;pcb_layer_t</title>
+<path fill="none" stroke="black" d="M631,-627.641C631,-604.317 631,-562.367 631,-534.589"/>
+<polygon fill="black" stroke="black" points="634.5,-534.352 631,-524.352 627.5,-534.352 634.5,-534.352"/>
+</g>
+<!-- LayerType_lines -->
+<g id="node24" class="node"><title>LayerType_lines</title>
+<ellipse fill="none" stroke="black" cx="241" cy="-355.477" rx="83.6854" ry="18"/>
+<text text-anchor="middle" x="241" y="-351.777" font-family="Times,serif" font-size="14.00">list and rtree of lines</text>
+</g>
+<!-- pcb_layer_t&#45;&gt;LayerType_lines -->
+<g id="edge25" class="edge"><title>pcb_layer_t&#45;&gt;LayerType_lines</title>
+<path fill="none" stroke="black" d="M590.583,-489.904C533.377,-468.56 425.551,-428.168 334,-392.953 319.401,-387.338 303.546,-381.152 289.132,-375.494"/>
+<polygon fill="black" stroke="black" points="290.003,-372.076 279.416,-371.675 287.443,-378.591 290.003,-372.076"/>
+</g>
+<!-- LayerType_arcs -->
+<g id="node25" class="node"><title>LayerType_arcs</title>
+<ellipse fill="none" stroke="black" cx="424" cy="-355.477" rx="81.4863" ry="18"/>
+<text text-anchor="middle" x="424" y="-351.777" font-family="Times,serif" font-size="14.00">list and rtree of arcs</text>
+</g>
+<!-- pcb_layer_t&#45;&gt;LayerType_arcs -->
+<g id="edge26" class="edge"><title>pcb_layer_t&#45;&gt;LayerType_arcs</title>
+<path fill="none" stroke="black" d="M607.254,-487.921C569.7,-460.984 496.599,-408.55 454.971,-378.692"/>
+<polygon fill="black" stroke="black" points="457.004,-375.842 446.838,-372.858 452.924,-381.53 457.004,-375.842"/>
+</g>
+<!-- LayerType_texts -->
+<g id="node26" class="node"><title>LayerType_texts</title>
+<ellipse fill="none" stroke="black" cx="631" cy="-355.477" rx="107.781" ry="18"/>
+<text text-anchor="middle" x="631" y="-351.777" font-family="Times,serif" font-size="14.00">list and rtree of text objects</text>
+</g>
+<!-- pcb_layer_t&#45;&gt;LayerType_texts -->
+<g id="edge27" class="edge"><title>pcb_layer_t&#45;&gt;LayerType_texts</title>
+<path fill="none" stroke="black" d="M631,-487.921C631,-462.549 631,-414.556 631,-384.114"/>
+<polygon fill="black" stroke="black" points="634.5,-383.767 631,-373.768 627.5,-383.768 634.5,-383.767"/>
+</g>
+<!-- LayerType_polygons -->
+<g id="node27" class="node"><title>LayerType_polygons</title>
+<ellipse fill="none" stroke="black" cx="856" cy="-355.477" rx="99.3824" ry="18"/>
+<text text-anchor="middle" x="856" y="-351.777" font-family="Times,serif" font-size="14.00">list and rtree of polygons</text>
+</g>
+<!-- pcb_layer_t&#45;&gt;LayerType_polygons -->
+<g id="edge28" class="edge"><title>pcb_layer_t&#45;&gt;LayerType_polygons</title>
+<path fill="none" stroke="black" d="M656.81,-487.921C697.608,-460.999 776.998,-408.61 822.259,-378.742"/>
+<polygon fill="black" stroke="black" points="824.416,-381.512 830.834,-373.083 820.56,-375.67 824.416,-381.512"/>
+</g>
+<!-- LayerType_misc -->
+<g id="node28" class="node"><title>LayerType_misc</title>
+<ellipse fill="none" stroke="black" cx="1030" cy="-355.477" rx="56.6372" ry="37.4533"/>
+<text text-anchor="middle" x="1030" y="-366.777" font-family="Times,serif" font-size="14.00">misc fields:</text>
+<text text-anchor="middle" x="1030" y="-351.777" font-family="Times,serif" font-size="14.00">flags</text>
+<text text-anchor="middle" x="1030" y="-336.777" font-family="Times,serif" font-size="14.00">colors</text>
+</g>
+<!-- pcb_layer_t&#45;&gt;LayerType_misc -->
+<g id="edge24" class="edge"><title>pcb_layer_t&#45;&gt;LayerType_misc</title>
+<path fill="none" stroke="black" d="M671.089,-494.016C734.538,-476.144 861.421,-438.109 964,-392.953 969.018,-390.745 974.16,-388.282 979.251,-385.709"/>
+<polygon fill="black" stroke="black" points="981.069,-388.708 988.323,-380.987 977.837,-382.499 981.069,-388.708"/>
+</g>
+<!-- LayerType_lines&#45;&gt;pcb_line_t -->
+<g id="edge20" class="edge"><title>LayerType_lines&#45;&gt;pcb_line_t</title>
+<path fill="none" stroke="black" d="M241,-337.444C241,-312.072 241,-264.08 241,-233.638"/>
+<polygon fill="black" stroke="black" points="244.5,-233.291 241,-223.291 237.5,-233.291 244.5,-233.291"/>
+</g>
+<!-- LayerType_arcs&#45;&gt;pcb_arc_t -->
+<g id="edge21" class="edge"><title>LayerType_arcs&#45;&gt;pcb_arc_t</title>
+<path fill="none" stroke="black" d="M424,-337.444C424,-312.072 424,-264.08 424,-233.638"/>
+<polygon fill="black" stroke="black" points="427.5,-233.291 424,-223.291 420.5,-233.291 427.5,-233.291"/>
+</g>
+<!-- LayerType_texts&#45;&gt;pcb_text_t -->
+<g id="edge23" class="edge"><title>LayerType_texts&#45;&gt;pcb_text_t</title>
+<path fill="none" stroke="black" d="M631,-337.444C631,-312.072 631,-264.08 631,-233.638"/>
+<polygon fill="black" stroke="black" points="634.5,-233.291 631,-223.291 627.5,-233.291 634.5,-233.291"/>
+</g>
+<!-- LayerType_polygons&#45;&gt;pcb_poly_t -->
+<g id="edge22" class="edge"><title>LayerType_polygons&#45;&gt;pcb_poly_t</title>
+<path fill="none" stroke="black" d="M856,-337.444C856,-312.072 856,-264.08 856,-233.638"/>
+<polygon fill="black" stroke="black" points="859.5,-233.291 856,-223.291 852.5,-233.291 859.5,-233.291"/>
+</g>
+<!-- round -->
+<g id="node29" class="node"><title>round</title>
+<ellipse fill="none" stroke="black" cx="954" cy="-54" rx="53.066" ry="26.7407"/>
+<text text-anchor="middle" x="954" y="-57.8" font-family="Times,serif" font-size="14.00">round:</text>
+<text text-anchor="middle" x="954" y="-42.8" font-family="Times,serif" font-size="14.00">struct field</text>
+</g>
+<!-- diamond -->
+<g id="node31" class="node"><title>diamond</title>
+<polygon fill="none" stroke="black" points="713,-92 615,-54 713,-16 811,-54 713,-92"/>
+<text text-anchor="middle" x="713" y="-57.8" font-family="Times,serif" font-size="14.00">diamond:</text>
+<text text-anchor="middle" x="713" y="-42.8" font-family="Times,serif" font-size="14.00">global variable</text>
+</g>
+<!-- grn -->
+<g id="node32" class="node"><title>grn</title>
+<polygon fill="#aaffaa" stroke="#aaffaa" points="597.5,-73 482.5,-73 482.5,-35 597.5,-35 597.5,-73"/>
+<text text-anchor="middle" x="540" y="-57.8" font-family="Times,serif" font-size="14.00">green:</text>
+<text text-anchor="middle" x="540" y="-42.8" font-family="Times,serif" font-size="14.00">drawing primitive</text>
+</g>
+</g>
+</svg>
Index: doc/developer/src/Makefile
===================================================================
--- doc/developer/src/Makefile	(revision 20858)
+++ doc/developer/src/Makefile	(revision 20859)
@@ -1,2 +1,2 @@
-../data1.png: data1.dot
-	dot -Tpng $^ > $@
+../data1.svg: data1.dot
+	dot -Tsvg $^ > $@