从android.graphics.Path中取出Point点，Kotlin

    /**
     * 从一条Path中获取多少个Point点
     */
    private fun getPoints(path: Path, pointCount: Int): Array<FloatPoint?> {
        val points = arrayOfNulls<FloatPoint>(pointCount)

        val pm = PathMeasure(path, false)
        val length = pm.length
        var distance = 0f
        val speed = length / pointCount
        var counter = 0
        val aCoordinates = FloatArray(2)
        while (distance < length && counter < pointCount) {
            // 从path中取出点Point
            pm.getPosTan(distance, aCoordinates, null)
            points[counter] = FloatPoint(
                aCoordinates[0],
                aCoordinates[1]
            )

            counter++

            distance += speed
        }

        return points
    }

    class FloatPoint(var x: Float, var y: Float)

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