Re: [Iup-users] Transperency bug (?)

[Antonio S. <sc...@te...>]

  That depends on the system. For instance, stipple is always opaque in the
base Windows driver which the CD_IUP driver relies on.

 

Best,

Scuri

 

From: Robert Persson [mailto:r.k...@gm...] 
Sent: terça-feira, 20 de setembro de 2011 08:34
To: iup...@li...
Subject: [Iup-users] Transperency bug (?)

 

Hi!

I have created a small IUP+CD program which draws a box sith a stipple
pattern. Code attached below. It seems that CD_TRANSPARENT does not work for
back opacity using stipples (?). For Hatches it works as expected.

/* Robert.P., Sweden */

//CODE START
#include <cd.h>
#include <cdpdf.h>

#include <iup.h>
#include <cdiup.h>

static cdCanvas* cdcanvas;

static unsigned char stip[]= {
    1,1,0,0,0,0,
    1,1,0,0,0,0,
    0,0,0,0,0,0,
    0,0,0,0,0,0,
    0,0,0,0,0,0,
    0,0,0,0,0,0
};

int canvasaction(Ihandle* ih) {

    cdCanvasActivate(cdcanvas);

    //draw a see-through line
    cdCanvasForeground(cdcanvas,0xff0000);
    cdCanvasLine(cdcanvas,0,0,200,200);

    //draw a test rectangle
    cdCanvasBackground(cdcanvas,0xffff00);
    cdCanvasForeground(cdcanvas,0x00);

    cdCanvasBackOpacity(cdcanvas,CD_TRANSPARENT);
    cdCanvasStipple(cdcanvas,6,6,stip);
    cdCanvasBox(cdcanvas,50,200,50,200);

    return IUP_DEFAULT;
}

int main()
{
    IupOpen(0,0);

    Ihandle* canvas;

    Ihandle* dlg=IupDialog(canvas=IupCanvas(0));

    IupSetAttribute(canvas,"RASTERSIZE","500x500");

    IupSetCallback(canvas,"ACTION",canvasaction);

    IupMap(dlg);


    cdcanvas=cdCreateCanvas(CD_IUP,canvas);

    IupShow(dlg);
    IupMainLoop();

    IupClose();

    return 0;
}
//END