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Add brush function in parallel coordinates #281

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Sep 26, 2017
Merged

Add brush function in parallel coordinates #281

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37 changes: 35 additions & 2 deletions src/svg/components/ParallelCoordinates.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,7 @@ import {
line,
drag,
event,
min,
max
brushY
} from 'd3';

class ParallelCoordinates extends Component {
Expand All @@ -25,6 +24,7 @@ class ParallelCoordinates extends Component {
private parallelAxes: any;
private lineGenerator: Line<any>;
private dragEventPositions: any;
private brushedExtent: any;

constructor() {
super();
Expand All @@ -45,7 +45,9 @@ class ParallelCoordinates extends Component {

this.updateDomainOfDimensions();
this.updateYaxesByDimensions(data, height);

this.dragEventPositions = {};
this.brushedExtent = {};

let thisInstance = this; // To use instance method in selection event

Expand Down Expand Up @@ -78,6 +80,20 @@ class ParallelCoordinates extends Component {
.style('cursor', 'move')
.attr('y', -9)
.text((d) => d);

// TODO we will separate brush configuration later

dimensionEntries.append('g')
.attr('class', 'brush')
.each(function(d) {
select(this)
.call(brushY().extent([[-8, 0], [8, height]])
.on('brush', (dimension: any) => thisInstance.brushed(d))
);
})
.selectAll('rect')
.attr('x', -8)
.attr('width', 16);
}

private initializeParallelCoordinates(width: number, height: number) {
Expand Down Expand Up @@ -167,6 +183,23 @@ class ParallelCoordinates extends Component {
.attr('visibility', null);
}

// TODO we will separate brush component later

private brushed(dimension: any) {
this.brushedExtent[dimension] = [this._yScale[dimension].invert(event.selection[1]),
this._yScale[dimension].invert(event.selection[0])];

let activeDimension = this._dimensions.filter((d) => (this.brushedExtent[d] == null) ? false : true),
thisInstance = this;

this.svg.selectAll('.foreground')
.attr('opacity', (d: any) => activeDimension.every((i: string) =>
(thisInstance.brushedExtent[i][0] <= d[i] && thisInstance.brushedExtent[i][1] >= d[i]))
? 1
: 0
);
}

}

export default ParallelCoordinates;