There's no way to specify exactly where the gridlines will fall. The API tries to set the min and max values of the axis such that all gridlines fall on "nice" values. In your example, you would probably end up with a range of 220-400, with lines every 20. You can specify the minValue and maxValue suboptions for the axis in question, and so long as they are outside the bounds of your data, the API will use those values to determine the axis values instead of your data, which can help you pick the values you need to get the interval you want. So if your data went from 230-400, you could specify 220 as the min and 400 as the max, which would most likely get you the results you want for a 20 unit interval with 10 gridlines. Does that make sense?
On Friday, November 23, 2012 6:48:40 AM UTC-5, Hubert Kubik wrote: > > Hello everybody, > I'm implementing some small application displaying physical properties > (like pressure) of substances depending of given temperature. > I would like to put guides at certain intervals - (chosen from set of 1, > 2, 5, 10, 20 ...) , but API gives me only the possibility of specifying > number of guidelines. > I'm thinking of implementing an algorithm to select the best number of > guides for a given range. > For example if we have temperature span 230-400 and maximum number of > guidelines = 10 the best interval would be 20 starting at 240. > But maybe you know of any smarter way to do that... > > Cheers > Hubert > -- You received this message because you are subscribed to the Google Groups "Google Visualization API" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-visualization-api/-/s9Obx7-78Q8J. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-visualization-api?hl=en.
