How can I add a grid line and value at end of a chart?

[Steve Morris]

My application shows a stacked column chart where the x-axis is a time window. The user can change the width of the time window but it always starts and ends on the hour.

The problem is that If the number of hours is not an even number, there is no grid line at the end of the chart, as shown below. I handle this if the window <= 12 hours by setting hAxis.gridlines.count so that there is a grid line every hour. However, that becomes too crowded when the window is more than 12 hours.

An additional problem is that, even if there is a grid line at the end of the chart, the graph does not show the value.

Is there a way to always show a line at the end of the chart and to show the value?

[Daniel LaLiberte]

Situations in which the chart area is not bounded by gridlines is considered less important than other criteria, though it does try.  If you specify a viewWindow min and max value, they will be used as hard constraints on the boundary, and then if the correct number of equally-spaced gridlines fall on the bounds you set, you will get those gridlines.  The count is a slightly less hard constraint, since it will be sacrificed (usually + or - one) if the resulting gridlines don't fall on nice-enough values.  

You can also specify exactly the tick values you want for where the gridlines should go, using the 'ticks' option.  

Hope this helps you get a result you are happy with.

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Daniel LaLiberte

dlaliberte@Google.com   5CC, Cambridge MA