Digital Workshop

Hi

I'm trying to create a small slider (needs to fit on a toolbar) that moves horizontally, which would allow the end-user to set the rotation angle for a vector (rotation angle is scripted using a variable, so if the variable is set to a number value like 15, the rotation will be 15 degrees).

An excellent sample, by Robin Garrett, is on the Forum at

viewtopic.php?t=658&highlight=slider

However, it is set up with some advanced math, arranged in percent values/increments and only in a positive direction. I can't figure out how to modify this sample slider so that it has a series of values (to set the variable to) expressed as minus to plus degrees instead: for example,
-90 degrees, -45 degrees, -15 degrees, -5 degrees, 0 degrees, +5 degrees, +15 degrees, +45 degrees and +90 degrees. The choices are arbitrary, but the minus to plus range is needed. There is no need to set the slider to scale or have values arranged in-between the few categories. The aim to to give the end-user a few choices, plus or minus, to set rotation angle (actual rotation is built into the vector-click and it turns). The slider is a more elegant solution than 9 very small buttons on the toolbar (too much space). (I also need to set up a second slider for scaling the vector with minus to plus values, but different increments.)

Any design help would be appreciated to suggest how this slider can be modified (or a new one constructed) to accomplish the above results.

Kind Regards,

Here's how you get the minus to plus range.

The key line in Robin's script is pospercent = Math.round(pospixabs/percentwidth)
which gives an output of 0-100.
you can reset the output from -50 to +50 by subtracting 50 from it.

pospercent = Math.round(pospixabs/percentwidth) - 50

you can scale the output with a multiplier -- since you are working in %, compensate for it with a suitable divisor.

example -- the line below will give an output of -90 to +90

pospercent = Math.round(((pospixabs/percentwidth)-50)*(90/50))

I've adapted the sample -- see the third page.

cheers
Paul

Hi Paul

Thanks once again for helping out. This is a very nice solution.

Kind Regards,