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<p>I don't know if I correctly understood you... but I think that,
if snap-to-grid is on, objects that are not exactly at a grid
vertex should go inmediatly to the nearer.</p>
<p>Two examples that don't help :D</p>
<p>Blender: it snaps to "next increment value". If object is at 0.5,
it goes to 1.5. I think this is good for some needings... but not
for PurrData. Watch blender.mp4</p>
<p>Inkscape: when snap-to-grid is on, object can be moved between
grid vertices. When is near a vertex, object sticks to it. I think
that Purr, snap-to-grid should always stick to the grid. I think
Inkscape is like this, because it has lot of snap-to options.
Watch Inkscape.mp4<br>
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<div class="moz-cite-prefix">On 20/10/20 13:31, Jonathan Wilkes
wrote:<br>
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<blockquote type="cite"
cite="mid:CAOA7yC7G1pOZ0dHSa=i4spj=COfZ7DRW-vdP0KCeANhVKgHYig@mail.gmail.com">
<div>2nd question:<br>
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<div><br>
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<div>Suppose the mouse pointer and the top-left corner of the
object underneath it are both 2/3 of the way to the post office
from their shared home.</div>
<div><br>
</div>
<div>1. Does the object wait until the mouse pointer has safely
arrived at the post office to "snap" itself to the post office?</div>
<div><br>
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<div>Or<br>
</div>
<div><br>
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<div>2. Does the object "snap" immediately to the post office at
the first step the mouse pointer takes toward the post office?</div>
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<div>If it's #1, then the selection will wait at an unsnapped
position until the mouse arrives at a grid line/point. So the
first step of an un-aligned object will have a UX like
"gravity"-- i.e., you are coaxing the selection to its initial
snap position. Also, the mouse may temporarily drag outside the
bounds of the object beneath it before the object snaps to its
new location.<br>
</div>
<div><br>
</div>
<div>If it's #2, then the selection will immediately align itself
to the grid constraints. This will provide consistency-- as any
mouse motion will guarantee grid alignment-- but have a jagged
feel on the first mouse motion of the un-aligned object. Edge
case-- if the mouse is near the top-left corner of an unaligned
object, then the object's initial grid snap will mean that the
mouse will be outside the object's bounds for the rest of the
time it's dragging.</div>
<div><br>
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<div>Since people generally drag more than one or two pixels with
a mouse, I'm leaning toward #1.</div>
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<div>I want to pick a pattern before I implement it. The backend
selection motion deals with deltas instead of coords, and that
makes this a bit more of a pain than it should be.</div>
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