Here is a small example of using a text gropnode:
----8<----
#include <picogui.h>
int main(int argc,char **argv) {
pghandle w;
pgInit(argc,argv);
pgRegisterApp(PG_APP_NORMAL,"Canvas Text",0);
w = pgNewWidget(PG_WIDGET_CANVAS,0,0);
pgWriteCmd(w,PGCANVAS_GROP,5,PG_GROP_TEXT,50,50,1,1);
pgWriteCmd(w,PGCANVAS_SETGROP,3,pgNewString("Hello,\nWorld!"),0,0x000000);
pgWriteCmd(w,PGCANVAS_COLORCONV,1,4);
pgEventLoop();
}
----8<----
For a little explanation... (sorry this stuff is horribly undocumented now)
The text gropnode takes 3 params: A string handle, an optional font descriptor, and a
color. Because the color is parameter 3, the mask '4' is used with the color
conversion.
The width and height parameters in PGCANVAS_GROP are not used, but should
be > 0 for compatibility.
It's a little convoluted as it is because that's the way it works in the server,
hopefully sometime relatively soon I'll make macros or something so the canvas
operations are more sane.
On Wed, 21 March 2001, Philippe Ney wrote:
>
> Hi Micah,
>
> I try to write text in canvas widget in the following way:
>
> pgWriteCmd(from,PGCANVAS_GROP,3,PG_GROP_TEXT,100,100);
> pgWriteCmd(from,PGCANVAS_SETGROP,2,PG_GROP_TEXT,pgNewString("TEST"));
> pgWriteCmd(from,PGCANVAS_SETGROP,1,0x000000);
> pgWriteCmd(from,PGCANVAS_COLORCONV,1,1);
>
> But the result is just an black square from origine to the pointer.
> As when I try to load bitmap in the canvas widget.
>
> Could you tell me how to write text and bitmap in canvas widget?
>
> Thanks,
> Philippe
>
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