[racket] Crowdsourcing Pict3D's design

This is what I ended up doing, as well as disabling mouse look on OS X. 
I used Firefox's autoscroll as inspiration, and I think I've made it 
usable enough. Let me know what you think.

Neil

On 03/11/2015 01:50 AM, Neil Van Dyke wrote:
> John Clements wrote on 03/11/2015 01:38 AM:
>> Maybe simpler: why not just treat the mouse like a joystick? That is,
>> if you press the mouse down and move it a little to the right and hold
>> it there, the camera continues to move smoothly until you release.
>
> Firefox "autoscroll" is one popular example of this. Middle-mouse-down
> on most parts of the page puts an indicator at pointer position on
> screen; then, until mouse-up, the direction and speed of the scrolling
> is relative to the direction and distance of pointer from this indicator.
>
> https://support.mozilla.org/en-US/kb/advanced-panel-accessibility-browsing-network-upda#w_browsing
>
>
> Neil V.
>
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