GUI features: mute, hold, fold, etc

[d.andrew STEWART]

Hello, Can we still use past features, such as mute, hold, fold, (I can't remember all of them) with the latest version of webmapper?

[Joseph Malloch]

Hi Andrew,

The mute/clamp/fold/wrap functionality was removed quite a while ago (for various reasons) but can be replicated using the map expression. What effect are you looking for?

Cheers,

Joe

[d.andrew STEWART]

Do you have time to give me an example of each (an example of an expression); then I can probably figure out the math more easily. I use all four: mute, clamp, fold, wrap., especially mute and clamp

What do you think?

[Joseph Malloch]

Hi Andrew – see if the examples below help. If you can share a specific scenario or mapping idea I can probably help...

All the expressions below assume your bounds are already defined, e.g.:

“minVal = -10; maxVal = 10;"

For the “mute” effect you can use a special expression variable named “muted”, e.g.:

Mute below minVal: “muted = x < minVal; y = x;”

Mute above maxVal: “muted = x > maxVal; y = x;”

Mute outside range: “muted = (x < minVal) || (x > maxVal); y = x;”

For the “clamp” effect you can use the functions min(), max() or both, e.g.:

Clamp at minVal: “y = max(minVal, x);”

Clamp at maxVal: “y = min(maxVal, x);”

Clamp at both: “y = max(minVal, min(x, maxVal));”

Fold and wrap are much more complex, especially when combining different effects at different extrema. Here are some of the simpler configurations:

Fold at minVal: “y = x > minVal ? x : 2 * minVal - x;”

Fold at maxVal: “y = x < maxVal ? x : 2 * maxVal - x;”

Fold at both: “a = (x - minVal) % range; y = floor((x - minVal) / range) % 2 ? minVal + a : maxVal - a;"

Wrap at minVal: “range = maxVal - minVal; y = x > minVal ? x : minVal + (x - minVal) % range;""

Wrap at maxVal: “range = maxVal - minVal; y = x < maxVal ? x : minVal + (x - minVal) % range;""

Wrap at both: “range = maxVal - minVal; y = minVal + (x - minVal) % range;"

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[d.andrew STEWART]

Thank you .  Will run tests