TOPIC:

dear radaee our problem is :
when use : Page_addAnnotRect(page, mat, &rect, g_rect_Width * m_scale, g_rect_color, fill_color);
we fill rect with a color with alpha 1
for example when draw rect with red color it fill with red but with alpha 1 and not transparent

you hint me with your Hint :
CGFloat clr[4];
clr[0] = //red, ... range [0,1];
clr[1] = //green, ... range [0,1];
clr[2] = //blue, ... range [0,1];
clr[3] = //alpha, ... range [0,1];
CGContextSetFillColor(m_ctx, clr);
CGContextFillRect(m_ctx, CGRectMake(...));

i change only clr[3] = 0.5;
but not different in my alpha in fill rect !
also when i change it my frame of reader's color change (not rect color change )

OK, the alpha channel must be in stroke color(g_rect_color).
alpha channel in fill_color is 0 if no filling, or 255 if has filling.

i really cant understand your mean
your mean there is no way to fill color with alpha ( for EXM : 0.5 ) ?
i want to draw rect Like your Android SDK [in android SDK when draw rect they fill with e color with custom alpha]

annotation just has 1 alpha information, both for stroke and fill or other graphics.
parameters has 2 color.
alpha informatioin is in sroke color.
fill color use same alpha value to stroke if fill_color alpha value is not zero.

can you help me

i try all of way but result is

upload7.ir/images/16534463092081659262.png

just try:

Page_addAnnotRect(page, mat, &rect, g_rect_Width * m_scale, 0x80FF0000, 0xFF0000FF);