private brushBrush()

in src/UXClient/Components/LineChart/LineChart.ts [836:879]
40 lines of code
13 McCabe index (conditional complexity)

    private brushBrush () {
        var handleHeight = this.getHandleHeight();
        this.brushElem.selectAll('.handle')
            .attr('height', handleHeight)
            .attr('y', (this.chartHeight - handleHeight) / 2);

        if (!d3.event.sourceEvent){
            return;
        } 
        if (d3.event.sourceEvent && d3.event.sourceEvent.type === 'mousemove') {
            this.brushElem.select(".selection").attr("visibility", "visible");
            //check boundary conditions for width of the brush
            if (d3.event.selection[1] - d3.event.selection[0] < this.minBrushWidth) {
                return;
            } else {
                this.brushElem.selectAll(".handle").attr("visibility", "visible");
            }
        }
        if (this.surpressBrushTimeSet == true) {
            this.surpressBrushTimeSet = false;
            return;
        }
        if (!d3.event.selection) return; 

        if (this.contextMenu)
            this.contextMenu.hide();
        if (this.brushContextMenu)
            this.brushContextMenu.hide();
        
        var newBrushStartPosition = d3.event.selection[0];
        var newBrushEndPosition = d3.event.selection[1];
        if (newBrushStartPosition != this.brushStartPosition) {
            this.brushStartTime = this.x.invert(d3.event.selection[0]);
            this.brushStartPosition = newBrushStartPosition;
        }
        if (newBrushEndPosition != this.brushEndPosition) {
            this.brushEndTime = this.x.invert(d3.event.selection[1]);
            this.brushEndPosition = newBrushEndPosition;
        }
    
        if (this.chartOptions.brushMoveAction) {
            this.chartOptions.brushMoveAction(this.brushStartTime, this.brushEndTime);
        }
    }