Alt-Modifier Key usually not available for Linux about jsfreechart HOT 2 OPEN

// detect Linux
if (!jsfc.Utils.isLinux) {
    jsfc.Utils.isLinux = function() {
        return navigator.appVersion.indexOf("X11") != -1 || navigator.appVersion.indexOf("Linux") != -1;
    }
}

// create modifier that works on Windows, Mac and Linux
if (!jsfc.Modifier.createModifier) {
    jsfc.Modifier.createModifier = function(altKey, ctrlKey, shiftKey, shiftExtends) {
        var m;
        if (jsfc.Utils.isMacOS()) {
            // Mac can't use ctrl key -> map to cmd key (meta key) 
            m = new jsfc.Modifier(altKey, false, ctrlKey, shiftKey);
        } else if (jsfc.Utils.isLinux()) { 
            // Linux can't use alt key -> map to Windows key (meta key)
            m = new jsfc.Modifier(false, ctrlKey, altKey, shiftKey);
        } else {
            // Windows, can't use the Windows key (meta key)
            m = new jsfc.Modifier(altKey, ctrlKey, false, shiftKey);
        }
        if (shiftExtends) {
            m.extension = new jsfc.Modifier(false, false, false, true);
        }
        return m;
    }
}