Thanks Daniel,

I've just been reading this 
https://github.com/google/google-visualization-issues/issues/1769 about 
this very thing.



On Sunday, December 18, 2022 at 6:34:49 PM UTC-5 [email protected] wrote:

> You'll have to set the viewWindow min and max values of one axis so that 
> it matches the min and max extreme values of the other axis.  It's also 
> useful to specify the axis tick values you want to see using the ticks 
> option.
>
> I did this using Ray's code.  See 
> https://jsfiddle.net/dlaliberte/91wef0ga/14/
>
>
> On Sun, Dec 18, 2022 at 5:07 PM 'Ray Thomas' via Google Visualization API <
> [email protected]> wrote:
>
>> It doesn't work properly! I used
>>
>> <script type="text/javascript">
>>       // Load Charts and the corechart package.
>>       google.charts.load('current', {'packages':['corechart']});
>>       google.charts.setOnLoadCallback(drawChart);
>>
>>       function drawChart() {
>>
>>    var queryString = encodeURIComponent('SELECT A,B ORDER BY A');
>>    var query = new google.visualization.Query('
>> https://docs.google.com/spreadsheets/d/1tswaWUAbeBijHq4o505w0h7TmbD-qGhR3jBactcbGq0/gviz/tq?gid=464392919&headers=1&tq='
>>  
>> + queryString);
>>    query.send(handleQueryResponse);
>> }
>>      
>> function handleQueryResponse(response) {
>>    if (response.isError()) {
>>    alert('Error in query: ' + response.getMessage() + ' ' + 
>> response.getDetailedMessage());
>>    return;
>> }
>>   
>> var data = response.getDataTable();
>>
>> // Set the column label properly for Fahrenheit
>> data.setColumnLabel(1, "Fahrenheit");
>> // Create a new column to hold the Celcius values
>> data.addColumn("number", "Celcius");
>> // Get the number of rows in the data
>> var totalRows= data.getNumberOfRows();
>>     
>> for (i = 0; i < totalRows; i++) { 
>>     fTemp = data.getValue(i,1);
>>     cTemp = (fTemp - 32) * 0.5556;
>>     data.setCell(i, 2, cTemp); 
>> }
>>
>> var options = {
>>     series: {
>>           0: {targetAxisIndex: 0},
>>           1: {targetAxisIndex: 1}
>>         },
>>     vAxes: {
>>           // Adds titles to each axis.
>>           0: {title: 'Temp: Fahrenheit'},
>>           1: {title: 'Temp: Celcius'}
>>         },
>> };
>>
>> var Chart = new 
>> google.visualization.LineChart(document.getElementById('switch-chart'));
>> Chart.draw(data, options);
>> }
>> </script>
>>
>> What that gives is:
>>
>> [image: charts-conversion.jpg]
>>
>> What I expected to happen is for the lines to line up with each other, 
>> but they don't. I will look at this again, it would be useful for other 
>> values, mph and km/hr etc.
>>
>> On Friday, December 16, 2022 at 10:30:19 PM UTC-5 Ray Thomas wrote:
>>
>>> I don't think you can do exactly what you want to do because the scale 
>>> and grid markers are calculated by the API.
>>>
>>> But what you could do is add a calculated column either in the original 
>>> data or create it before the API processes the data, that contains 
>>> the fahrenheit values and display that on the right hand side. See the help 
>>> for series and vAxes at 
>>> https://developers.google.com/chart/interactive/docs/gallery/linechart?csw=1#dual-y-charts
>>>  
>>> and the JSFiddle at https://jsfiddle.net/api/post/library/pure/
>>>
>>> Something else you can do is add both values to the tooltips. The help 
>>> for customizing the tooltips is at 
>>> https://developers.google.com/chart/interactive/docs/customizing_tooltip_content
>>>
>>>
>>>
>>>
>>>
>>> On Wednesday, December 14, 2022 at 9:39:49 PM UTC-5 
>>> [email protected] wrote:
>>>
>>>> I'm using the line chart and having some trouble formatting the y-axis 
>>>> grid markers. The data provided is stored in Celsius, but I'd like the 
>>>> labels on the left to also show Fahrenheit. For example one of the markers 
>>>> is showing 22, but I'd like it to show something like 22 / 71.6. This is 
>>>> my 
>>>> first time using Google Charts and I couldn't find anything in the 
>>>> documentation about manually adjusting automatic values. Can anyone point 
>>>> me in the right direction?
>>>>
>>>> [image: Screenshot 2022-12-14 at 6.33.27 PM.png]
>>>>
>>>> -- 
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>>  
>> <https://groups.google.com/d/msgid/google-visualization-api/aab92913-58a2-4a54-b8b2-3dee7f19387bn%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>>
>
>
> -- 
>
> • Daniel LaLiberte
>
>  • SWE
>
>  • Cambridge MA
>
>  • [email protected]
>

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