extjs chart y 축 정수 표현하기

axes: [{
        type: 'numeric3d',
        position: 'left',
        minimum:0,                      
        fields: ['field1','field2'], 
        renderer: function (label, layout, lastLabel) {
            var string = layout.toString(); 
            var found = string.indexOf('.');
            if(found == '-1') {
                return layout;  
            } else {
                return ' '
            }

        },
        grid: {
            odd: {
                fillStyle: 'rgba(245, 245, 245, 2)'
            },
            even: {
                fillStyle: 'rgba(255, 255, 255, 2)'
            }
        },

        title: {
            text: 'Title Name'
        }

    }]