Gordon Webster wrote:
I'm sure there is some overhead - but not too much. (Note - this is speculation on my part - I have no inside knowledge.)Dear Revolutionaries
I have a question or two about rev's graphic objects ...
Since the rev graphic objects such as lines and shapes
are objects that can have their own properties, styles
etc., is there a big memory overhead in using them to
create complicated graphics?
I'd be concerned about storing a million objects each of which is a single line - but not about a few thousand of them (though it can be expensive in time to create many graphics - or even worse to delete them ....)
Note that there are some very clever things you can do with polygon objects that in some cases allow you to achieve the drawing effects you want with many fewer graphic objects (and much more speed).
For instance, you can put a "marker" on each vertex of a polygon (this is a quick way to draw many similar shapes - set the marker of a polygon to the shape you want to draw, and then simply adding a vertex to the polygon gives you a whole extra shape. This is often used in combination with the other unusual feature - a blank line in the list of vertices results in a "non-visible" edge; so a list of points like
100,100
100,200
200,200 400,400 400,500 will result in two disjoint line line segments.
What would be the best way in rev to do the equivalentThe simple answer is that you probably don't need to double-buffer it. Of course there are cases where the simple answer is wrong :-)
of double-buffering the graphics i.e. invisibly
drawing the next frame of a complex graphic in
background and then displaying it?
If you have a few thousand graphic shapes, and want to redraw them, then you may need to. On the other hand, if you can use the clever features of polygons above, then you can get very smooth animation effects at very high speed without double-buffering.
If you need to double-buffer, you can do set lockscreen to true -- draw the "next" screen now set lockscreen to false
If you haven't already, take a look at Malte's libRMC (latest version announced on the list within the last few weeks)
-- Alex.
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