The effect draw block is growing each time you
add a new line or circle to draw.
Each time
show b
is called, everything in the draw block is drawn.
So as it grows, so it slows.
A solution is to capture b's image once every while
or perhaps every iteration, with:
img: to-image b
and clear the draw block at the same time.
Then set b's image like this:
b/image: img
and at the next iteration, draw on top of that.
Anton.
> Hi all !!
>
> i'm new in rebol and i'm not good in english so i'd try to be clear.
>
> I just test a script from auverlot's book, here it is :
>
> **********
> REBOL []
> pos-xy: none
> view layout [
> b: box 400x400 white feel [
> detect: func [face event] [
> switch event/type [
> move [
> pos-xy: event/offset
> append b/effect/draw reduce [pos-xy]
> show b
> ]
> down [
> pos-xy: event/offset
> append b/effect/draw reduce ['circle pos-xy 30 'line]
> show b
> ]
> alt-down [
> append b/effect/draw reduce ['fill-pen (random 255.255.255)
> 'line]
> ]
> ]
> ]
> redraw: none
> ] effect [draw ['pen black 'line]]
> ]
> ************
>
> So first when i moved around the mouse over the box very fast the
> pen seems
> to follow very good.
> but if i click down just one time (a circle is paint in the box), then
> suddenly the pen seems to
> be late. if i stop move the mouse, the pen ends up arriving, and if i move
> fast again, the pen is
> always late.
>
> I don't understand why a simple draw circle command in a dynamic drawing
> decrease the drawing performance.
>
> I hope that you've understand my question. Thanks in advance to all.
>
> Fred.
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