interpolations
interpolations: Array<object> = [{ name: 'basis', value: d3Shape.curveBasis },{ name: 'basisClosed', value: d3Shape.curveBasisClosed },{ name: 'basisOpen', value: d3Shape.curveBasisOpen },{ name: 'bundle', value: d3Shape.curveBundle },{ name: 'cardinal', value: d3Shape.curveCardinal },{ name: 'cardinalClosed', value: d3Shape.curveCardinalClosed },{ name: 'cardinalOpen', value: d3Shape.curveCardinalOpen },{ name: 'catmullRom', value: d3Shape.curveCatmullRom },{ name: 'catmullRomClosed', value: d3Shape.curveCatmullRomClosed },{ name: 'catmullRomOpen', value: d3Shape.curveCatmullRomOpen },{ name: 'linear', value: d3Shape.curveLinear },{ name: 'linearClosed', value: d3Shape.curveLinearClosed },{ name: 'monotoneX', value: d3Shape.curveMonotoneX },{ name: 'monotoneY', value: d3Shape.curveMonotoneY },{ name: 'natural', value: d3Shape.curveNatural },{ name: 'step', value: d3Shape.curveStep },{ name: 'stepAfter', value: d3Shape.curveStepAfter },{ name: 'stepBefore', value: d3Shape.curveStepBefore }]