Replace jsPlumb by writing some SVG arrows ourselves.
authorSteinar H. Gunderson <sgunderson@bigfoot.com>
Fri, 22 Nov 2013 23:22:49 +0000 (00:22 +0100)
committerSteinar H. Gunderson <sgunderson@bigfoot.com>
Fri, 22 Nov 2013 23:22:49 +0000 (00:22 +0100)
www/index.html
www/js/remoteglot.js

index 699ec5e..b2320bd 100644 (file)
   Moves provided by <a href="http://www.freechess.org/">FICS</a>.
   Hosting and main analysis hardware by <a href="http://www.samfundet.no/">Studentersamfundet i Trondhjem</a>.
   JavaScript chessboard powered by <a href="http://chessboardjs.com/">chessboard.js</a>.
-  Arrows by <a href="http://jsplumbtoolkit.com">jsPlumb</a>&mdash;who would think you could
-  draw such beautiful arrows in just 161 kB of JavaScript on top of the
-  323 kB needed for jQuery and jQuery UI? How far technology has come. If you want something
-  more retro, the <a href="/text.pl">text interface</a> is still available.</p>
+  If you want something more retro, the <a href="/text.pl">text interface</a> is still available.</p>
 
 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
-<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.2/jquery-ui.min.js"></script>
-<script type="text/javascript" src="js/jquery.jsPlumb-1.5.3-min.js"></script>
 <script type="text/javascript" src="js/chessboard-0.3.0.min.js"></script>
 <script type="text/javascript" src="js/remoteglot.js"></script>
 </body>
index 128568a..98d9ac4 100644 (file)
@@ -1,7 +1,6 @@
 var board = null;
 var hiddenboard = null;
 var arrows = [];
-var arrow_targets = [];
 var occupied_by_arrows = [];
 var refutation_lines = [];
 var move_num = 1;
@@ -33,21 +32,14 @@ var request_update = function(board) {
 
 var clear_arrows = function() {
        for (var i = 0; i < arrows.length; ++i) {
-               if (arrows[i].connection1) {
-                       jsPlumb.detach(arrows[i].connection1);
-               }
-               if (arrows[i].connection2) {
-                       jsPlumb.detach(arrows[i].connection2);
+               if (arrows[i].svg) {
+                       arrows[i].svg.parentElement.removeChild(arrows[i].svg);
+                       delete arrows[i].svg;
                }
        }
        arrows = [];
 
-       for (var i = 0; i < arrow_targets.length; ++i) {
-               document.body.removeChild(arrow_targets[i]);
-       }
-       arrow_targets = [];
-       
-       occupied_by_arrows = [];        
+       occupied_by_arrows = [];
        for (var y = 0; y < 8; ++y) {
                occupied_by_arrows.push([false, false, false, false, false, false, false, false]);
        }
@@ -101,16 +93,43 @@ var interfering_arrow = function(from, to) {
        return false;
 }
 
-var add_target = function() {
-       var elem = document.createElement("div");
-       $(elem).addClass("window");
-       elem.id = "target" + arrow_targets.length;
-       document.body.appendChild(elem);        
-       arrow_targets.push(elem);
-       return elem.id;
+var point_from_start = function(x1, y1, x2, y2, t, u) {
+       var dx = x2 - x1;
+       var dy = y2 - y1;
+
+       var norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
+       dx *= norm;
+       dy *= norm;
+
+       var x = x1 + dx * t + dy * u;
+       var y = y1 + dy * t - dx * u;
+       return x + " " + y;
 }
-       
+
+var point_from_end = function(x1, y1, x2, y2, t, u) {
+       var dx = x2 - x1;
+       var dy = y2 - y1;
+
+       var norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
+       dx *= norm;
+       dy *= norm;
+
+       var x = x2 + dx * t + dy * u;
+       var y = y2 + dy * t - dx * u;
+       return x + " " + y;
+}
+
 var position_arrow = function(arrow) {
+       if (arrow.svg) {
+               arrow.svg.parentElement.removeChild(arrow.svg);
+               delete arrow.svg;
+       }
+       if (current_display_line !== null) {
+               return;
+       }
+
+       var pos = $(".square-a8").position();
+
        var zoom_factor = $("#board").width() / 400.0;
        var line_width = arrow.line_width * zoom_factor;
        var arrow_size = arrow.arrow_size * zoom_factor;
@@ -121,71 +140,56 @@ var position_arrow = function(arrow) {
        var from_x = (arrow.from_col + 0.5)*square_width;
        var to_x = (arrow.to_col + 0.5)*square_width;
 
-       var dx = to_x - from_x;
-       var dy = to_y - from_y;
-       var len = Math.sqrt(dx * dx + dy * dy);
-       dx /= len;
-       dy /= len;
-       var pos = $(".square-a8").position();
-       $("#" + arrow.s1).css({ top: pos.top + from_y + (0.5 * arrow_size) * dy, left: pos.left + from_x + (0.5 * arrow_size) * dx });
-       $("#" + arrow.d1).css({ top: pos.top + to_y - (0.5 * arrow_size) * dy, left: pos.left + to_x - (0.5 * arrow_size) * dx });
-       $("#" + arrow.s1v).css({ top: pos.top + from_y - 0 * dy, left: pos.left + from_x - 0 * dx });
-       $("#" + arrow.d1v).css({ top: pos.top + to_y + 0 * dy, left: pos.left + to_x + 0 * dx });
-
-       if (arrow.connection1) {
-               jsPlumb.detach(arrow.connection1);
-       }
-       if (arrow.connection2) {
-               jsPlumb.detach(arrow.connection2);
-       }
-       if (current_display_line !== null) {
-               delete arrow.connection1;
-               delete arrow.connection2;
-               return;
-       }
-       arrow.connection1 = jsPlumb.connect({
-               source: arrow.s1,
-               target: arrow.d1,
-               connector:["Straight"],
-               cssClass:"c1",
-               endpoint:"Blank",
-               endpointClass:"c1Endpoint",                                                                                                        
-               anchor:"Continuous",
-               paintStyle:{ 
-                       lineWidth:line_width,
-                       strokeStyle:arrow.fg_color,
-                       outlineWidth:1,
-                       outlineColor:"#666",
-                       opacity:"60%"
-               }
-       });
-       arrow.connection2 = jsPlumb.connect({
-               source: arrow.s1v,
-               target: arrow.d1v,
-               connector:["Straight"],
-               cssClass:"vir",
-               endpoint:"Blank",
-               endpointClass:"c1Endpoint",                                                                                                        
-               anchor:"Continuous",
-               paintStyle:{ 
-                       lineWidth:0,
-                       strokeStyle:arrow.fg_color,
-                       outlineWidth:0,
-                       outlineColor:"#666"
-               },
-               overlays : [
-                       ["Arrow", {
-                               cssClass:"l1arrow",
-                               location:1.0,
-                               width: arrow_size,
-                               length: arrow_size,
-                               paintStyle: { 
-                                       lineWidth:line_width,
-                                       strokeStyle:"#000"
-                               }
-                       }]
-               ]
-       });
+       var SVG_NS = "http://www.w3.org/2000/svg";
+       var XHTML_NS = "http://www.w3.org/1999/xhtml";
+       var svg = document.createElementNS(SVG_NS, "svg");
+       svg.setAttribute("width", $("#board").width());
+       svg.setAttribute("height", $("#board").height());
+       svg.setAttribute("style", "position: absolute");
+       svg.setAttribute("position", "absolute");
+       svg.setAttribute("version", "1.1");
+       svg.setAttribute("class", "c1");
+       svg.setAttribute("xmlns", XHTML_NS);
+
+       var x1 = from_x;
+       var y1 = from_y;
+       var x2 = to_x;
+       var y2 = to_y;
+
+       // Draw the line.
+       var outline = document.createElementNS(SVG_NS, "path");
+       outline.setAttribute("d", "M " + point_from_start(x1, y1, x2, y2, arrow_size / 2, 0) + " L " + point_from_end(x1, y1, x2, y2, -arrow_size / 2, 0));
+       outline.setAttribute("xmlns", XHTML_NS);
+       outline.setAttribute("stroke", "#666");
+       outline.setAttribute("stroke-width", line_width + 2);
+       outline.setAttribute("fill", "none");
+       svg.appendChild(outline);
+
+       var path = document.createElementNS(SVG_NS, "path");
+       path.setAttribute("d", "M " + point_from_start(x1, y1, x2, y2, arrow_size / 2, 0) + " L " + point_from_end(x1, y1, x2, y2, -arrow_size / 2, 0));
+       path.setAttribute("xmlns", XHTML_NS);
+       path.setAttribute("stroke", arrow.fg_color);
+       path.setAttribute("stroke-width", line_width);
+       path.setAttribute("fill", "none");
+       svg.appendChild(path);
+
+       // Then the arrow head.
+       var head = document.createElementNS(SVG_NS, "path");
+       head.setAttribute("d",
+               "M " +  point_from_end(x1, y1, x2, y2, 0, 0) +
+               " L " + point_from_end(x1, y1, x2, y2, -arrow_size, -arrow_size / 2) +
+               " L " + point_from_end(x1, y1, x2, y2, -arrow_size * .623, 0.0) +
+               " L " + point_from_end(x1, y1, x2, y2, -arrow_size, arrow_size / 2) +
+               " L " + point_from_end(x1, y1, x2, y2, 0, 0));
+       head.setAttribute("xmlns", XHTML_NS);
+       head.setAttribute("stroke", "#000");
+       head.setAttribute("stroke-width", "1");
+       head.setAttribute("fill", "#f66");
+       svg.appendChild(head);
+
+       $(svg).css({ top: pos.top, left: pos.left });
+       document.body.appendChild(svg);
+       arrow.svg = svg;
 }
 
 var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_size) {
@@ -196,16 +200,12 @@ var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_
 
        // Create arrow.
        var arrow = {
-               s1: add_target(),
-               d1: add_target(),
-               s1v: add_target(),
-               d1v: add_target(),
                from_col: from_col,
                from_row: from_row,
                to_col: to_col,
                to_row: to_row,
                line_width: line_width,
-               arrow_size: arrow_size, 
+               arrow_size: arrow_size,
                fg_color: fg_color
        };