> 1 - Is there any way to fill complex polygons with image
> patterns? (or, as an alternative, is there any way to define
> non rectangular clipping?)
Not as such - you can easily fill a rectangular area using the
Fl_Tiled_Image() class, but irregular polygons we don't really support,
either as a surface or as clipping.
Though there have been patches in the past to support it, I do not think
there is anything in any of the current main-line versions.
What I'd do is render the fill into an offscreen then use a barn-door
mask to get the polygon, but that's a bit of work, so may not suit your
needs.
Others may have more practical solutions!
> 2 - How can I resize only the width of fonts characters?
Hmm, this was asked a while back, maybe June of last year? It's not
something we really support, though at the time I posted a hack demo of
how it can be done, albeit a bit crude.
OK, found it, here's the example.
You can maybe take some ideas from this then do a better job!
---------
// fltk-config --compile text-scale.cxx
#include <stdlib.h>
#include <stdio.h>
#include <FL/Fl.H>
#include <FL/x.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/fl_draw.H>
#include <FL/math.h>
void draw_offscreen();
static Fl_Offscreen offscreen_cxt = NULL;
static Fl_Double_Window *main_win = NULL;
static char message[64];
static int scale = 1;
class scope_view: public Fl_Box
{
void draw();
public:
scope_view(int x, int y,int w,int h, const char *l=0) :
Fl_Box(x,y,w,h,l) {}
};
void scope_view::draw()
{
int wd = w();
int ht = h();
int xo = x();
int yo = y();
if(offscreen_cxt){
fl_copy_offscreen(xo, yo, wd, ht, offscreen_cxt, 0, 0);
}
else {
fl_color(FL_GRAY);
fl_rectf(xo, yo, wd, ht);
draw_offscreen();
}
} /* end of draw() method */
static scope_view *scope = 0;
class text_view: public Fl_Box
{
void draw();
public:
text_view(int x, int y,int w,int h, const char *l=0) :
Fl_Box(x,y,w,h,l) {}
};
static uchar *data_p = NULL;
static Fl_Image *img_tmp = NULL;
void text_view::draw()
{
int wd = scope->w();
int ht = scope->h();
int xo = 0;
int yo = 0;
if(offscreen_cxt) { // offscreen exists, grab something
if(data_p){
delete[] data_p;
data_p = NULL;
}
fl_begin_offscreen(offscreen_cxt); /* Open the offscreen context for
reading */
data_p = fl_read_image(data_p, 0, 0, wd, ht, 0);
fl_end_offscreen(); // close the offscreen context
Fl_RGB_Image rgb(data_p, wd, ht);
if(img_tmp){
delete img_tmp; // free the previous image before copying the new
one
}
img_tmp = rgb.copy(wd * scale, ht); // scale the image in the width
direction
img_tmp->draw(x(), y(), wd, ht, 0, 0);
}
} /* end of draw() method */
static text_view *zoom = 0;
void draw_offscreen()
{
int wd = scope->w();
int ht = scope->h();
int xo = 0;
int yo = 0;
if (!offscreen_cxt) offscreen_cxt = fl_create_offscreen(wd, ht);
if (!offscreen_cxt) {puts("Bad Offscreen"); exit(-1);}
fl_begin_offscreen(offscreen_cxt);
fl_color(FL_WHITE);
fl_rectf(xo, yo, wd, ht);
fl_color(FL_BLACK);
fl_font(FL_HELVETICA, 24);
int tw, th;
tw = th = 0;
fl_measure(message, tw, th);
fl_draw(message, xo + 10, yo + 10 + th);
fl_end_offscreen();
// scope->redraw();
// zoom->redraw();
main_win->redraw();
} /* end of draw() method */
void update_zoom(void *)
{
static int d = 1;
scale = scale + d;
if(scale > 4) {
d = -1;
}
if(scale < 2) {
d = +1;
}
sprintf(message, "Scaled by %d", scale);
draw_offscreen();
Fl::repeat_timeout(1.0, update_zoom);
} // update_offscreen
int main(int argc, char **argv)
{
sprintf(message, "Scaled by %d", scale);
main_win = new Fl_Double_Window(522, 500, "Zoom Text Window");
main_win->begin();
scope = new scope_view(5, 5, 512, 200);
zoom = new text_view(5, 210, 512, 200);
main_win->end();
main_win->show(argc, argv);
Fl::add_timeout(0.1, update_zoom);
return Fl::run();
}
/* end of file */
----------
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