[visualization-api] How to chance haxis data display. How to change column color by value

[Erez V.]

Hello,
Here is the code for a column chart: 
 function drawVisualization_b() {
        
        var data = new google.visualization.DataTable();
data.addColumn('string', 'Couple');
data.addColumn('number', 'profit');


for(var i = 0; i <= datum_b.length-1 ; i++){
datum_b[i].profit=parseFloat(datum_b[i].profit);
var obj = datum_b[i];
data.addRow([obj.item, obj.profit]);
}


  
  
    var options = {
      title :'Profit / Loss of all traded instruments',
      vAxis: {title: 'Balance', gridlines: { count: 10 }},
     
      hAxis: {title: 'Traded Instruments ', direction: 1, 
        textPosition : 'out', slantedText: true, 
        slantedTextAngle: 60},
  colors:['navy'],
       animation: {
          duration: 1000,
          easing: 'out',
          startup: true},
  bar: { groupWidth: '80%' },
  barVisibilityThreshold :-1,
  seriesType: 'bars'};

    var chart = new 
google.visualization.ComboChart(document.getElementById('balance_div'));
    chart.draw(data, options);

And Here is how it id displayed : 

When the mouse hovers above the 3 dots on the x axis the name of the item 
is displayed in a bracket.
I want att items(forex couples) will be displayed slanted
How do I do it ? 

I also want that a column with positive value will be green and a column 
with negative value will be red
How can it be done ?

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