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livetrax/share/web_surfaces/builtin/mixer/toolkit/widgets/chart.js

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WS: Improve mixer demo
2020-06-21 17:29:27 -04:00
/*
* This file is part of Toolkit.
*
* Toolkit is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* Toolkit is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General
* Public License along with this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
"use strict";
(function(w, TK){
function calculate_overlap(X, Y) {
/* no overlap, return 0 */
if (X[2] < Y[0] || Y[2] < X[0] || X[3] < Y[1] || Y[3] < X[1]) return 0;
return (Math.min(X[2], Y[2]) - Math.max(X[0], Y[0])) *
(Math.min(X[3], Y[3]) - Math.max(X[1], Y[1]));
}
function show_handles() {
var handles = this.handles;
for (var i = 0; i < handles.length; i++) {
this.add_child(handles[i]);
}
}
function hide_handles() {
var handles = this.handles;
for (var i = 0; i < handles.length; i++) {
this.remove_child(handles[i]);
}
}
var STOP = function(e) {
e.preventDefault();
e.stopPropagation();
return false;
}
function draw_key() {
var __key, bb;
var _key = this._key;
var _key_bg = this._key_background;
if (!_key || !_key_bg) return;
while (_key.firstChild !== _key.lastChild)
_key.removeChild(_key.lastChild);
TK.empty(_key.firstChild);
var O = this.options;
var disp = "none";
var gpad = TK.css_space(_key, "padding");
var gmarg = TK.css_space(_key, "margin");
var c = 0;
var w = 0;
var top = 0;
var lines = [];
for (var i = 0; i < this.graphs.length; i++) {
if (this.graphs[i].get("key") !== false) {
var t = TK.make_svg("tspan", {"class": "toolkit-label",
style: "dominant-baseline: central;"
});
t.textContent = this.graphs[i].get("key");
t.setAttribute("x", gpad.left);
_key.firstChild.appendChild(t);
if (!bb) bb = _key.getBoundingClientRect();
top += c ? parseInt(TK.get_style(t, "line-height")) : gpad.top;
t.setAttribute("y", top + bb.height / 2);
lines.push({
x: (parseInt(TK.get_style(t, "margin-right")) || 0),
y: Math.round(top),
width: Math.round(bb.width),
height: Math.round(bb.height),
"class": this.graphs[i].element.getAttribute("class"),
color: (this.graphs[i].element.getAttribute("color") || ""),
style: this.graphs[i].element.getAttribute("style")
})
w = Math.max(w, t.getComputedTextLength());
disp = "block";
c++;
}
}
for (var i = 0; i < lines.length; i++) {
var b = TK.make_svg("rect", {
"class": lines[i]["class"] + " toolkit-rect",
color: lines[i].color,
style: lines[i].style,
x: lines[i].x + 0.5 + w + gpad.left,
y: lines[i].y + 0.5 + parseInt(lines[i].height / 2 - O.key_size.y / 2),
height: O.key_size.y,
width: O.key_size.x
});
_key.appendChild(b);
}
_key_bg.style.display = disp;
_key.style.display = disp;
bb = _key.getBoundingClientRect();
var width = this.range_x.options.basis;
var height = this.range_y.options.basis;
switch (O.key) {
case "top-left":
__key = {
x1: gmarg.left,
y1: gmarg.top,
x2: gmarg.left + parseInt(bb.width) + gpad.left + gpad.right,
y2: gmarg.top + parseInt(bb.height) + gpad.top + gpad.bottom
}
break;
case "top-right":
__key = {
x1: width - gmarg.right - parseInt(bb.width) - gpad.left - gpad.right,
y1: gmarg.top,
x2: width - gmarg.right,
y2: gmarg.top + parseInt(bb.height) + gpad.top + gpad.bottom
}
break;
case "bottom-left":
__key = {
x1: gmarg.left,
y1: height - gmarg.bottom - parseInt(bb.height) - gpad.top - gpad.bottom,
x2: gmarg.left + parseInt(bb.width) + gpad.left + gpad.right,
y2: height - gmarg.bottom
}
break;
case "bottom-right":
__key = {
x1: width - gmarg.right - parseInt(bb.width) - gpad.left - gpad.right,
y1: height -gmarg.bottom - parseInt(bb.height) - gpad.top - gpad.bottom,
x2: width - gmarg.right,
y2: height - gmarg.bottom
}
break;
default:
TK.warn("Unsupported key", O.key);
}
_key.setAttribute("transform", "translate(" + __key.x1 + "," + __key.y1 + ")");
_key_bg.setAttribute("x", __key.x1);
_key_bg.setAttribute("y", __key.y1);
_key_bg.setAttribute("width", __key.x2 - __key.x1);
_key_bg.setAttribute("height", __key.y2 - __key.y1);
}
function draw_title() {
var _title = this._title;
if (!_title) return;
_title.textContent = this.options.title;
/* FORCE_RELAYOUT */
TK.S.add(function() {
var mtop = parseInt(TK.get_style(_title, "margin-top") || 0);
var mleft = parseInt(TK.get_style(_title, "margin-left") || 0);
var mbottom = parseInt(TK.get_style(_title, "margin-bottom") || 0);
var mright = parseInt(TK.get_style(_title, "margin-right") || 0);
var bb = _title.getBoundingClientRect();
var x,y,anchor, range_x = this.range_x, range_y = this.range_y;
switch (this.options.title_position) {
case "top-left":
anchor = "start";
x = mleft;
y = mtop + bb.height / 2;
break;
case "top":
anchor = "middle";
x = range_x.options.basis / 2;
y = mtop + bb.height / 2;
break;
case "top-right":
anchor = "end";
x = range_x.options.basis - mright;
y = mtop + bb.height / 2;
break;
case "left":
anchor = "start";
x = mleft;
y = range_y.options.basis / 2;
break;
case "center":
anchor = "middle";
x = range_x.options.basis / 2;
y = range_y.options.basis / 2;
break;
case "right":
anchor = "end";
x = range_x.options.basis - mright;
y = range_y.options.basis / 2;
break;
case "bottom-left":
anchor = "start";
x = mleft;
y = range_y.options.basis - mtop - bb.height / 2;
break;
case "bottom":
anchor = "middle";
x = range_x.options.basis / 2;
y = range_y.options.basis - mtop - bb.height / 2;
break;
case "bottom-right":
anchor = "end";
x = range_x.options.basis - mright;
y = range_y.options.basis - mtop - bb.height / 2;
break;
default:
TK.warn("Unsupported title_position", this.options.title_position);
}
TK.S.add(function() {
_title.setAttribute("text-anchor", anchor);
_title.setAttribute("x", x);
_title.setAttribute("y", y);
}, 1);
}.bind(this));
}
/**
* TK.Chart is an SVG image containing one or more Graphs. TK.Chart
* extends {@link TK.Widget} and contains a {@link TK.Grid} and two
* {@link TK.Range}s.
*
* @param {Object} [options={ }] - An object containing initial options.
*
* @property {String|Boolean} [options.title=""] - A title for the Chart.
* Set to `false` to remove the title from the DOM.
* @property {String} [options.title_position="top-right"] - Position of the
* title inside of the chart. Possible values are
* <code>"top-left"</code>, <code>"top"</code>, <code>"top-right"</code>,
* <code>"left"</code>, <code>"center"</code>, <code>"right"</code>,
* <code>"bottom-left"</code>, <code>"bottom"</code> and
* <code>"bottom-right"</code>.
* @property {Boolean|String} [options.key=false] - If set to a string
* a key is rendered into the chart at the given position. The key
* will detail names and colors of the graphs inside of this chart.
* Possible values are <code>"top-left"</code>, <code>"top-right"</code>,
* <code>"bottom-left"</code> and <code>"bottom-right"</code>. Set to `false`
* to remove the key from the DOM.
* @property {Object} [options.key_size={x:20,y:10}] - Size of the colored
* rectangles inside of the key describing individual graphs.
* @property {Array<Object>} [options.grid_x=[]] - An array containing
* objects with the following optional members to draw the grid:
* @property {Number} [options.grid_x.pos] - The value where to draw grid line and corresponding label.
* @property {String} [options.grid_x.color] - A valid CSS color string to colorize the elements.
* @property {String} [options.grid_x.class] - A class name for the elements.
* @property {String} [options.grid_x.label] - A label string.
* @property {Array<Object>} [options.grid_y=[]] - An array containing
* objects with the following optional members to draw the grid:
* @property {Number} [options.grid_y.pos] - The value where to draw grid line and corresponding label.
* @property {String} [options.grid_y.color] - A valid CSS color string to colorize the elements.
* @property {String} [options.grid_y.class] - A class name for the elements.
* @property {String} [options.grid_y.label] - A label string.
* @property {Boolean} [options.show_grid=true] - Set to <code>false</code> to
* hide the grid.
* @property {Function|Object} [options.range_x={}] - Either a function
* returning a {@link TK.Range} or an object containing options for a
* new {@link TK.Range}.
* @property {Function|Object} [options.range_y={}] - Either a function
* returning a {@link TK.Range} or an object containing options for a
* new {@link TK.Range}.
* @property {Object|Function} [options.range_z={ scale: "linear", min: 0, max: 1 }] -
* Either a function returning a {@link TK.Range} or an object
* containing options for a new {@link TK.Range}.
* @property {Number} [options.importance_label=4] - Multiplicator of
* square pixels on hit testing labels to gain importance.
* @property {Number} [options.importance_handle=1] - Multiplicator of
* square pixels on hit testing handles to gain importance.
* @property {Number} [options.importance_border=50] - Multiplicator of
* square pixels on hit testing borders to gain importance.
* @property {Array<Object>} [options.handles=[]] - An array of options for
* creating {@link TK.ResponseHandle} on init.
* @property {Boolean} [options.show_handles=true] - Show or hide all
* handles.
*
* @class TK.Chart
*
* @extends TK.Widget
*/
function geom_set(value, key) {
this.set_style(key, value+"px");
TK.error("using deprecated '"+key+"' options");
}
TK.Chart = TK.class({
_class: "Chart",
Extends: TK.Widget,
Implements: TK.Ranges,
_options: Object.assign(Object.create(TK.Widget.prototype._options), {
width: "int",
height: "int",
_width: "int",
_height: "int",
range_x: "object",
range_y: "object",
range_z: "object",
key: "string",
key_size: "object",
title: "string",
title_position: "string",
resized: "boolean",
importance_label: "number",
importance_handle: "number",
importance_border: "number",
handles: "array",
show_handles: "boolean",
depth: "number",
}),
options: {
grid_x: [],
grid_y: [],
range_x: {}, // an object with options for a range for the x axis
// or a function returning a TK.Range instance (only on init)
range_y: {}, // an object with options for a range for the y axis
// or a function returning a TK.Range instance (only on init)
range_z: { scale: "linear", min: 0, max: 1 }, // TK.Range z options
key: false, // key draws a description for the graphs at the given
// position, use false for no key
key_size: {x:20, y:10}, // size of the key rects
title: "", // a title for the chart
title_position: "top-right", // the position of the title
resized: false,
importance_label: 4, // multiplicator of square pixels on hit testing
// labels to gain importance
importance_handle: 1, // multiplicator of square pixels on hit testing
// handles to gain importance
importance_border: 50, // multiplicator of square pixels on hit testing
// borders to gain importance
handles: [], // list of bands to create on init
show_handles: true,
},
static_events: {
set_width: geom_set,
set_height: geom_set,
mousewheel: STOP,
DOMMouseScroll: STOP,
set_depth: function(value) {
this.range_z.set("basis", value);
},
set_show_handles: function(value) {
(value ? show_handles : hide_handles).call(this);
},
},
initialize: function (options) {
var E, S;
/**
* @member {Array} TK.Chart#graphs - An array containing all SVG paths acting as graphs.
*/
this.graphs = [];
/**
* @member {Array} TK.Chart#handles - An array containing all {@link TK.ResponseHandle} instances.
*/
this.handles = [];
TK.Widget.prototype.initialize.call(this, options);
/**
* @member {TK.Range} TK.Chart#range_x - The {@link TK.Range} for the x axis.
*/
/**
* @member {TK.Range} TK.Chart#range_y - The {@link TK.Range} for the y axis.
*/
this.add_range(this.options.range_x, "range_x");
this.add_range(this.options.range_y, "range_y");
this.add_range(this.options.range_z, "range_z");
this.range_y.set("reverse", true, true, true);
/**
* @member {HTMLDivElement} TK.Chart#element - The main DIV container.
* Has class <code>toolkit-chart</code>.
*/
if (!(E = this.element)) this.element = E = TK.element("div");
TK.add_class(E, "toolkit-chart");
this.widgetize(E, true, true, true);
this.svg = S = TK.make_svg("svg");
if (!this.options.width)
this.options.width = this.range_x.options.basis;
if (!this.options.height)
this.options.height = this.range_y.options.basis;
/**
* @member {SVGGroup} TK.Chart#_graphs - The SVG group containing all graphs.
* Has class <code>toolkit-graphs</code>.
*/
this._graphs = TK.make_svg("g", {"class": "toolkit-graphs"});
S.appendChild(this._graphs);
E.appendChild(S);
if (this.options.width) this.set("width", this.options.width);
if (this.options.height) this.set("height", this.options.height);
/**
* @member {SVGGroup} TK.Chart#_handles - The SVG group containing all handles.
* Has class <code>toolkit-handles</code>.
*/
this._handles = TK.make_svg("g", {"class": "toolkit-handles"});
this.svg.appendChild(this._handles);
this.svg.onselectstart = function () { return false; };
this.add_handles(this.options.handles);
},
resize: function () {
var E = this.element;
var O = this.options;
var S = this.svg;
TK.Widget.prototype.resize.call(this);
var tmp = TK.css_space(S, "border", "padding");
var w = TK.inner_width(E) - tmp.left - tmp.right;
var h = TK.inner_height(E) - tmp.top - tmp.bottom;
if (w > 0 && O._width !== w) {
this.set("_width", w);
this.range_x.set("basis", w);
this.invalid._width = true;
this.trigger_draw();
}
if (h > 0 && O._height !== h) {
this.set("_height", h);
this.range_y.set("basis", h);
this.invalid._height = true;
this.trigger_draw();
}
},
redraw: function () {
var I = this.invalid;
var E = this.svg;
var O = this.options;
TK.Widget.prototype.redraw.call(this);
if (I.validate("ranges", "_width", "_height", "range_x", "range_y")) {
/* we need to redraw both key and title, because
* they do depend on the size */
I.title = true;
I.key = true;
var w = O._width;
var h = O._height;
if (w && h) {
E.setAttribute("width", w + "px");
E.setAttribute("height", h + "px");
}
}
if (I.graphs) {
for (var i = 0; i < this.graphs.length; i++) {
this.graphs[i].redraw();
}
}
if (I.validate("title", "title_position")) {
draw_title.call(this);
}
if (I.validate("key", "key_size", "graphs")) {
draw_key.call(this);
}
if (I.show_handles) {
I.show_handles = false;
if (O.show_handles) {
this._handles.style.removeProperty("display");
} else {
this._handles.style.display = "none";
}
}
},
destroy: function () {
for (var i = 0; i < this._graphs.length; i++) {
this._graphs[i].destroy();
}
this._graphs.remove();
this._handles.remove();
TK.Widget.prototype.destroy.call(this);
},
add_child: function(child) {
if (child instanceof TK.Graph) {
this.add_graph(child);
return;
}
TK.Widget.prototype.add_child.call(this, child);
},
remove_child: function(child) {
if (child instanceof TK.Graph) {
this.remove_graph(child);
return;
}
TK.Widget.prototype.remove_child.call(this, child);
},
/**
* Add a graph to the chart.
*
* @method TK.Chart#add_graph
*
* @param {Object} graph - The graph to add. This can be either an
* instance of {@link TK.Graph} or an object of options to
* {@link TK.Graph}.
*
* @returns {Object} The instance of {@link TK.Graph}.
*
* @emits TK.Chart#graphadded
*/
add_graph: function (options) {
var g;
if (TK.Graph.prototype.isPrototypeOf(options)) {
g = options;
} else {
g = new TK.Graph(options);
}
g.set("container", this._graphs);
if (!g.options.range_x) g.set("range_x", this.range_x);
if (!g.options.range_y) g.set("range_y", this.range_y);
this.graphs.push(g);
g.add_event("set", function (key, value, obj) {
if (key === "color" || key === "class" || key === "key") {
this.invalid.graphs = true;
this.trigger_draw();
}
}.bind(this));
/**
* Is fired when a graph was added. Arguments are the graph
* and its position in the array.
*
* @event TK.Chart#graphadded
*
* @param {TK.Graph} graph - The {@link TK.Graph} which was added.
* @param {int} id - The ID of the added {@link TK.Graph}.
*/
this.fire_event("graphadded", g, this.graphs.length - 1);
this.invalid.graphs = true;
this.trigger_draw();
TK.Widget.prototype.add_child.call(this, g);
return g;
},
/**
* Remove a graph from the chart.
*
* @method TK.Chart#remove_graph
*
* @param {TK.Graph} graph - The {@link TK.Graph} to remove.
*
* @emits TK.Chart#graphremoved
*/
remove_graph: function (g) {
var i;
if ((i = this.graphs.indexOf(g)) !== -1) {
/**
* Is fired when a graph was removed. Arguments are the graph
* and its position in the array.
*
* @event TK.Chart#graphremoved
*
* @param {TK.Graph} graph - The {@link TK.Graph} which was removed.
* @param {int} id - The ID of the removed {@link TK.Graph}.
*/
this.fire_event("graphremoved", g, i);
g.destroy();
this.graphs.splice(i, 1);
TK.Widget.prototype.remove_child.call(this, g);
this.invalid.graphs = true;
this.trigger_draw();
}
},
/**
* Remove all graphs from the chart.
*
* @method TK.Chart#empty
*
* @emits TK.Chart#emptied
*/
empty: function () {
this.graphs.map(this.remove_graph, this);
/**
* Is fired when all graphs are removed from the chart.
*
* @event TK.Chart#emptied
*/
this.fire_event("emptied");
},
/**
* Add a new handle to the widget. Options is an object containing
* options for the {@link TK.ResponseHandle}.
*
* @method TK.Chart#add_handle
*
* @param {Object} [options={ }] - An object containing initial options. - The options for the {@link TK.ResponseHandle}.
* @param {Object} [type=TK.ResponseHandle] - A widget class to be used as the new handle.
*
* @emits TK.Chart#handleadded
*/
add_handle: function (options, type) {
type = type || TK.ResponseHandle;
options.container = this._handles;
if (options.range_x === void(0))
options.range_x = function () { return this.range_x; }.bind(this);
if (options.range_y === void(0))
options.range_y = function () { return this.range_y; }.bind(this);
if (options.range_z === void(0))
options.range_z = function () { return this.range_z; }.bind(this);
options.intersect = this.intersect.bind(this);
var h = new type(options);
this.handles.push(h);
if (this.options.show_handles)
this.add_child(h);
/**
* Is fired when a new handle was added.
*
* @param {TK.ResponseHandle} handle - The {@link TK.ResponseHandle} which was added.
*
* @event TK.Chart#handleadded
*/
this.fire_event("handleadded", h);
return h;
},
/**
* Add multiple new {@link TK.ResponseHandle} to the widget. Options is an array
* of objects containing options for the new instances of {@link TK.ResponseHandle}.
*
* @method TK.Chart#add_handles
*
* @param {Array<Object>} options - An array of options objects for the {@link TK.ResponseHandle}.
* @param {Object} [type=TK.ResponseHandle] - A widget class to be used for the new handles.
*/
add_handles: function (handles, type) {
for (var i = 0; i < handles.length; i++)
this.add_handle(handles[i], type);
},
/**
* Remove a handle from the widget.
*
* @method TK.Chart#remove_handle
*
* @param {TK.ResponseHandle} handle - The {@link TK.ResponseHandle} to remove.
*
* @emits TK.Chart#handleremoved
*/
remove_handle: function (handle) {
// remove a handle from the widget.
for (var i = 0; i < this.handles.length; i++) {
if (this.handles[i] === handle) {
if (this.options.show_handles)
this.remove_child(handle);
this.handles[i].destroy();
this.handles.splice(i, 1);
/**
* Is fired when a handle was removed.
*
* @event TK.Chart#handleremoved
*/
this.fire_event("handleremoved");
break;
}
}
},
/**
* Remove multiple or all {@link TK.ResponseHandle} from the widget.
*
* @method TK.Chart#remove_handles
*
* @param {Array<TK.ResponseHandle>} handles - An array of
* {@link TK.ResponseHandle} instances. If the argument reveals to
* `false`, all handles are removed from the widget.
*/
remove_handles: function (handles) {
var H = handles || this.handles.slice();
for (var i = 0; i < H.length; i++) {
this.remove_handle(H[i]);
}
if (!handles) {
this.handles = [];
/**
* Is fired when all handles are removed.
*
* @event TK.Chart#emptied
*/
this.fire_event("emptied");
}
},
intersect: function (X, handle) {
// this function walks over all known handles and asks for the coords
// of the label and the handle. Calculates intersecting square pixels
// according to the importance set in options. Returns an object
// containing intersect (the amount of intersecting square pixels) and
// count (the amount of overlapping elements)
var c = 0;
var a = 0, _a;
var O = this.options;
var importance_handle = O.importance_handle
var importance_label = O.importance_label
for (var i = 0; i < this.handles.length; i++) {
var h = this.handles[i];
if (h === handle || !h.get("active") || !h.get("show_handle")) continue;
_a = calculate_overlap(X, h.handle);
if (_a) {
c ++;
a += _a * importance_handle;
}
_a = calculate_overlap(X, h.label);
if (_a) {
c ++;
a += _a * importance_label;
}
}
if (this.bands && this.bands.length) {
for (var i = 0; i < this.bands.length; i++) {
var b = this.bands[i];
if (b === handle || !b.get("active") || !b.get("show_handle")) continue;
_a = calculate_overlap(X, b.handle);
if (_a > 0) {
c ++;
a += _a * importance_handle;
}
_a = calculate_overlap(X, b.label);
if (_a > 0) {
c ++;
a += _a * importance_label;
}
}
}
/* calculate intersection with border */
_a = calculate_overlap(X, [ 0, 0, this.range_x.options.basis, this.range_y.options.basis ]);
a += ((X[2] - X[0]) * (X[3] - X[1]) - _a) * O.importance_border;
return {intersect: a, count: c};
},
});
/**
* @member {TK.Grid} TK.Chart#grid - The grid element of the chart.
* Has class <code>toolkit-grid</code>.
*/
TK.ChildWidget(TK.Chart, "grid", {
create: TK.Grid,
show: true,
append: function() {
this.svg.insertBefore(this.grid.element, this.svg.firstChild);
},
map_options: {
grid_x: "grid_x",
grid_y: "grid_y",
},
default_options: function () {
return {
range_x: this.range_x,
range_y: this.range_y,
};
},
});
function key_hover_cb(ev) {
var b = ev.type === "mouseenter";
TK.toggle_class(this, "toolkit-hover", b);
/* this.nextSibling is the key */
TK.toggle_class(this.nextSibling, "toolkit-hover", b);
}
/**
* @member {SVGRect} TK.Chart#_key_background - The SVG rectangle of the key.
* Has class <code>toolkit-background</code>.
*/
TK.ChildElement(TK.Chart, "key_background", {
option: "key",
display_check: function(v) {
return !!v;
},
create: function() {
var k = TK.make_svg("rect", {"class": "toolkit-background"});
k.addEventListener("mouseenter", key_hover_cb);
k.addEventListener("mouseleave", key_hover_cb);
return k;
},
append: function() {
this.svg.appendChild(this._key_background);
},
});
/**
* @member {SVGGroup} TK.Chart#_key - The SVG group containing all descriptions.
* Has class <code>toolkit-key</code>.
*/
TK.ChildElement(TK.Chart, "key", {
option: "key",
display_check: function(v) {
return !!v;
},
create: function() {
var key = TK.make_svg("g", {"class": "toolkit-key"});
key.appendChild(TK.make_svg("text", {"class": "toolkit-key-text"}));
return key;
},
append: function() {
this.svg.appendChild(this._key);
},
});
/**
* @member {SVGText} TK.Chart#_title - The title of the chart.
* Has class <code>toolkit-title</code>.
*/
TK.ChildElement(TK.Chart, "title", {
option: "title",
display_check: function(v) {
return typeof(v) === "string" && v.length;
},
create: function() {
return TK.make_svg("text", {
"class": "toolkit-title",
style: "dominant-baseline: central;"
});
},
append: function() {
var svg = this.svg;
svg.insertBefore(this._title, svg.firstChild);
},
});
})(this, this.TK);
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