Martin Nordholts wrote:
>* Tim Jedlicka wrote:**
*>>*
*>>* I stumbled upon this link describing the use of the Diagonal (45 degree
*>>* diagonal from each corner of an image) as the optimum crop guide ("better"
*>>* than rule-of-thirds or golden rule).
...
*

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> Oops, it of course depends on portrait or landscape which line you hit
> first. I think you will have to throw in an if there.
I figured out a way to avoid the "if" statement. However, I don't know which
method would be more efficient. i.e. should I try to avoid the "if"? These
diagonal crop guides are very dynamic as you change your crop rectangle so I
don't want to bog down the rendering. Just need some guidance on which route
to take. I'll then have some follow up questions since I am not much of a
coder (I'll do this off list unless directed otherwise).
gimpregionselecttool.c has this bit of code when selecting a region:
/* don't let the events come in too fast, ignore below a delay of 100 ms
*/
if (time - last_time < 100)
return;
last_time = time;
diff_x = coords->x - region_sel->x;
diff_y = coords->y - region_sel->y;
diff = ((ABS (diff_x) > ABS (diff_y)) ? diff_x : diff_y) / 2.0;
So there "if" doesn't look like it is too costly.
The way I came up with to avoid the "if" is (pseudo code):
X = x2-x1
Y = y2-y1
Z = [(X + Y) - ABS (X - Y)] / 2
So the upper left diagonal would go from x1,y1 to (x1 + Z), (y1 + Z)
Any advice on which way to implement?
--
Tim Jedlicka, Network Entomologist
[EMAIL PROTECTED], http://www.galifree.com

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