[ruslan_mart]

function calculate(data) {
    var d,
        x = data[0] || 0,
        y = data[1] || 0,
        z = data[2] || 0,
        massive = [];
    if(x + y + z == 0) return {};
    while(y - x > z) {
        x += z;
        massive.push([x, x * Math.PI]);
    }
    return massive;
}