如何更改Google圖表工具提示的字體大小

Question

如何更改Google圖表工具提示的字體大小？ [這是我試過到目前爲止：https://jsfiddle.net/Albion87/ujpv8oep/3/] 這些都是我需要的一組選項..

// Set chart options 
var options = { 
    isStacked: true, 
    tooltip: { textStyle: { fontName: 'verdana', fontSize: 7 } },  
    width: 800, 
    height: 600, 
    chart: { 
     title: 'Year-by-year coffee consumption', 
     subtitle: 'This data is not real' 
    },  
    vAxis: { 
     viewWindow: { 
      min: 0, 
      max: 100 
     } 
    }, 
    legend: { position: 'left', alignment: 'start' }, 
    series: { 
     2: { 
      targetAxisIndex: 1 
     }, 
     3: { 
      targetAxisIndex: 1 
     } 
    }, 
    backgroundColor: {fill: 'transparent'}, 
    chartArea: { 
     backgroundColor: 'transparent' 
    } 
}; 

enter image description here

Answer 1

問題是材料圖...

有是幾個選項，簡單地不起作用材料圖表，
包括...

tooltip.isHtml 
tooltip.showColorCode 
tooltip.textStyle 
tooltip.trigger 

看到 - >Tracking Issue for Material Chart Feature Parity #2143

---

建議嘗試以下與選項核心圖...

theme: 'material' 

---

材料圖表 - >google.charts.Bar - packages: ['bar']

核心圖表 - >google.visualization.ColumnChart - packages: ['corechart']