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missing.js
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{
function mg_missing_add_text(svg, {missing_text, width, height}) {
svg.selectAll('.mg-missing-text').data([missing_text])
.enter().append('text')
.attr('class', 'mg-missing-text')
.attr('x', width / 2)
.attr('y', height / 2)
.attr('dy', '.50em')
.attr('text-anchor', 'middle')
.text(missing_text);
}
function mg_missing_x_scale(args) {
args.scales.X = d3.scaleLinear()
.domain([0, args.data.length])
.range([mg_get_plot_left(args), mg_get_plot_right(args)]);
args.scalefns.yf = ({y}) => args.scales.Y(y);
}
function mg_missing_y_scale(args) {
args.scales.Y = d3.scaleLinear()
.domain([-2, 2])
.range([args.height - args.bottom - args.buffer * 2, args.top]);
args.scalefns.xf = ({x}) => args.scales.X(x);
}
function mg_make_fake_data(args) {
const data = [];
for (let x = 1; x <= 50; x++) {
data.push({ x, y: Math.random() - (x * 0.03) });
}
args.data = data;
}
function mg_add_missing_background_rect(g, {title, buffer, title_y_position, width, height}) {
g.append('svg:rect')
.classed('mg-missing-background', true)
.attr('x', buffer)
.attr('y', buffer + (title ? title_y_position : 0) * 2)
.attr('width', width - buffer * 2)
.attr('height', height - buffer * 2 - (title ? title_y_position : 0) * 2)
.attr('rx', 15)
.attr('ry', 15);
}
function mg_missing_add_line(g, {scalefns, interpolate, data}) {
const line = d3.line()
.x(scalefns.xf)
.y(scalefns.yf)
.curve(interpolate);
g.append('path')
.attr('class', 'mg-main-line mg-line1-color')
.attr('d', line(data));
}
function mg_missing_add_area(g, {scalefns, scales, interpolate, data}) {
const area = d3.area()
.x(scalefns.xf)
.y0(scales.Y.range()[0])
.y1(scalefns.yf)
.curve(interpolate);
g.append('path')
.attr('class', 'mg-main-area mg-area1-color')
.attr('d', area(data));
}
function mg_remove_all_children({target}) {
d3.select(target).selectAll('svg *').remove();
}
function mg_missing_remove_legend({legend_target}) {
if (legend_target) {
d3.select(legend_target).html('');
}
}
function missingData(args) {
this.init = (args) => {
this.args = args;
mg_init_compute_width(args);
mg_init_compute_height(args);
// create svg if one doesn't exist
const container = d3.select(args.target);
mg_raise_container_error(container, args);
let svg = container.selectAll('svg');
mg_remove_svg_if_chart_type_has_changed(svg, args);
svg = mg_add_svg_if_it_doesnt_exist(svg, args);
mg_adjust_width_and_height_if_changed(svg, args);
mg_set_viewbox_for_scaling(svg, args);
mg_remove_all_children(args);
svg.classed('mg-missing', true);
mg_missing_remove_legend(args);
chart_title(args);
// are we adding a background placeholder
if (args.show_missing_background) {
mg_make_fake_data(args);
mg_missing_x_scale(args);
mg_missing_y_scale(args);
const g = mg_add_g(svg, 'mg-missing-pane');
mg_add_missing_background_rect(g, args);
mg_missing_add_line(g, args);
mg_missing_add_area(g, args);
}
mg_missing_add_text(svg, args);
this.windowListeners();
return this;
};
this.windowListeners = () => {
mg_window_listeners(this.args);
return this;
};
this.init(args);
}
const defaults = {
top: [40, 'number'], // the size of the top margin
bottom: [30, 'number'], // the size of the bottom margin
right: [10, 'number'], // size of the right margin
left: [0, 'number'], // size of the left margin
buffer: [8, 'number'], // the buffer between the actual chart area and the margins
legend_target: ['', 'string'],
width: [350, 'number'],
height: [220, 'number'],
missing_text: ['Data currently missing or unavailable', 'string'],
show_tooltips: [true, 'boolean'],
show_missing_background: [true, 'boolean']
};
MG.register('missing-data', missingData, defaults);
}

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