public void setCircleFillRatio(float fillRatio) {
        if (fillRatio < 0) {
            fillRatio = 0;
        } else if (fillRatio > 1) {
            fillRatio = 1;
        }

        this.circleFillRatio = fillRatio;
        calculateCircleOval();
    }
Set how much of view area should be taken by chart circle. Value should be between 0 and 1. Default is 1 so
circle will have radius equals min(View.width, View.height).
hellocharts-library/src/lecho/lib/hellocharts/renderer/PieChartRenderer.java