              name: 'snap: show display both value'
                    }, {
                        gridIndex: 1,
                        nameLocation: 'middle',
                        nameGap: 30,
                        name: 'not snap: put axis on the middle of the two points, should display only one value.'
                    }, {
                        gridIndex: 2,
                        nameLocation: 'middle',
                        nameGap: 30,
                        name: 'step line not snap