How to Calculate Plot Height?

[David Armour]

I would like to automate the calculation for the parameters that go in AXSPOS and AXSLEN however I cannot figure out how to calculate the overall plot height.

In some cases I need to rotate the X-Axis labels to be vertical which then means I need more space.

How can I calculate the points from the top of the TITLIN #1 down to the bottom X_AXIS, and then from the X_AXIS to the bottom of the X_AXIS TITLE?

Using this data I believe I could correctly set my AXSPOS and AXSLEN parameters so that my plot always fits in the page.

[Helmut Michels]

Hi Dave,

you can get the width and height of a plot with the routine getpag. For example, Dislin uses this values

for setting the default axis lengths to 2/3 of the page length and height.

The top position of the first title line is:

        ytop = nya - nyl - nshift  - 2 * nh  - 3 * (xlinsp * nh) - nh

where

       nya is the y-position of the bottom x-axis   (the value in axpos (nxa, nya));

       nyl is the length of the y-axis;

       nshift is the shift parameter defined by vkytit. The default value is 0;

       nh  is the character height of the title lines defined by height or htitle;

       xlinsp is the  line space factor defined by linesp. The default value is 1.5;

       2 * nh is the space between the top x-axis and the bottom of title line # 4.

The bottom position of the first title line is then:

       ybottom =  ytop + nh

The formulas above are only correct if the origin of the page is located in the upper

left corner, which is the default.

Perhaps, it's easier for you to write the title with the Dislin routine messag at your

own position.

With best regards,

Helmut

[David Armour]

Hi Helmut,

Thanks for that info. My problem is the plot falling off the bottom of the page when I rotate the X-Axis labels vertically. How do I get the size of the labels in points for the DISLIN generated labels (e.g. dates) and their position below the X-Axis?

Rgds,

David

[David Armour]

Hi,

Does anyone know how to do this?

Rgds,

David

[Helmut Michels]

the length of numbers and strings  can be calculated with the functions

nlnumb and nlmess. So, you have to find the longest label and calculate the length of it.

If the labels are in numeric format, it can easily be done from the axis parameters in graf.

For date labels it's a little bit more complicate. I think that you have to use the longest possible

date string. The distance of the labels from an axis is defined by the routines labdis and ticlen,

where the position of the ticks is also important.