Hallo, Rebecca Schatz hat gesagt: // Rebecca Schatz wrote:
I have a really simple question: Does anyone know how to make a patch that will give me the speed the mouse is moving? I'm on windows and am using gemmouse to get the position.
A handy idiom to get the difference between a value's current and its previous position is a cross-wired trigger-substraction construct like this:
[t f f]
\ /
x
/
[- ]
If you connect for example a slider on top of that, you can see how fast the slider was moved. With Gem you can use the values coming out of gemmouse inserted into this idiom. You can also drive the whole thing with a [metro] or from the [gemhead] while storing the mouse coordinate into a [float]'s right inlet like:
[gemhead] <- or use a [metro] here | [b] [gemmouse] | | [float] | [t f f] X [- ] | [s SPEED-X]
Duplicate this for the y coordinate, if you want. For absolute speed in both directions you can add the squares of "SPEED-X" and "SPEED-Y" and [sqrt] it. That's like in Pythagoras from school: a^2 + b^2 = c^2
But when using this with [gemmouse] make you you match the [gemmouse] coordinates with the [gemwin] coordinates accordingly. There was a mailing list thread one or two weeks ago about this, search the archive for "scaling" and "interpolation" or so.
Ciao
Frank Barknecht _ ______footils.org__