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brush.js
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brush.js
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{
const get_extent_rect = args => {
return d3.select(args.target).select('.mg-extent').size()
? d3.select(args.target).select('.mg-extent')
: d3.select(args.target)
.select('.mg-rollover-rect, .mg-voronoi')
.insert('g', '*')
.classed('mg-brush', true)
.append('rect')
.classed('mg-extent', true);
};
const create_brushing_pattern = (args, range) => {
const x = range.x[0];
const width = range.x[1] - range.x[0];
const y = range.y[0];
const height = range.y[1] - range.y[0];
get_extent_rect(args)
.attr('x', x)
.attr('width', width)
.attr('y', y)
.attr('height', height)
.attr('opacity', 1);
};
const remove_brushing_pattern = args => {
get_extent_rect(args)
.attr('width', 0)
.attr('height', 0)
.attr('opacity', 0);
};
const add_event_handler_for_brush = (args, target, axis) => {
const svg = d3.select(args.target).select('svg');
const rollover = svg.select('.mg-rollover-rect, .mg-voronoi');
const container = rollover.node();
const targetUid = mg_target_ref(args.target);
let isDragging = false;
let mouseDown = false;
let origin = [];
const calculateSelectionRange = () => {
const min_x = args.left;
const max_x = args.width - args.right - args.buffer;
const min_y = args.top;
const max_y = args.height - args.bottom - args.buffer;
const mouse = d3.mouse(container);
const range = {};
range.x = axis.x ? [
Math.max(min_x, Math.min(origin[0], mouse[0])),
Math.min(max_x, Math.max(origin[0], mouse[0]))
] : [min_x, max_x];
range.y = axis.y ? [
Math.max(min_y, Math.min(origin[1], mouse[1])),
Math.min(max_y, Math.max(origin[1], mouse[1]))
] : [min_y, max_y];
return range;
};
rollover.classed('mg-brush-container', true);
rollover.on('mousedown.' + targetUid, () => {
mouseDown = true;
isDragging = false;
origin = d3.mouse(container);
svg.classed('mg-brushed', false);
svg.classed('mg-brushing-in-progress', true);
remove_brushing_pattern(args);
});
d3.select(document).on('mousemove.' + targetUid, () => {
if (mouseDown) {
isDragging = true;
rollover.classed('mg-brushing', true);
create_brushing_pattern(args, calculateSelectionRange());
}
});
d3.select(document).on('mouseup.' + targetUid, () => {
if (!mouseDown) return;
mouseDown = false;
svg.classed('mg-brushing-in-progress', false);
const range = calculateSelectionRange();
if (isDragging) {
isDragging = false;
if (target === args) {
MG.zoom_to_data_range(target, range);
if (args.click_to_zoom_out)
svg.select('.mg-rollover-rect, .mg-voronoi').classed('mg-brushed', true);
} else {
const domain = MG.convert_range_to_domain(args, range);
MG.zoom_to_data_domain(target, domain);
}
} else if (args.click_to_zoom_out) {
MG.zoom_to_raw_range(target);
}
if (mg_is_function(args.brushing_selection_changed))
args.brushing_selection_changed(args, range);
});
};
const add_brush_function = args => {
if (args.x_axis_type === 'categorical' || args.y_axis_type === 'categorical')
return console.warn('The option "brush" does not support axis type "categorical" currently.');
if (!args.zoom_target) args.zoom_target = args;
if (args.zoom_target !== args) args.zoom_target.processed.subplot = args;
let brush_axis;
switch (args.brush) {
case 'x':
brush_axis = {x: true, y: false};
break;
case 'y':
brush_axis = {x: false, y: true};
break;
case 'xy':
brush_axis = {x: true, y: true};
break;
default:
brush_axis = {x: true, y: true};
}
add_event_handler_for_brush(args, args.zoom_target, brush_axis);
};
MG.add_brush_function = add_brush_function;
MG.create_brushing_pattern = create_brushing_pattern;
MG.remove_brushing_pattern = remove_brushing_pattern;
}

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brush.js (3 KB)

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