On 8 Jun 2010, at 17:08, Leandro Fanzone wrote:
>
> I know those are many, and perhaps silly questions, but I couldn't
> find a suitable example among the demos, and I know you said "no
> examples" ;)
OK, here's something that works, but it is hacked together out of a
few bits I had lying around, lacks any useful comments, and is
probably *not* the smartest way to achieve the desired affect...
Tested on OSX only, as I can't be bothered moving over to another PC...
OH - And past experience suggests that the mailing process will
probably wrap all the longer lines and make the code even more of a
mess. Be aware!
--------------
// fltk-config --compile text-scale.cxx
#include <stdlib.h>
#include <stdio.h>
#include <FL/Fl.H>
#include <FL/x.H>
#include <FL/Fl_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_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_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);
draw_offscreen();
Fl::add_timeout(1.0, update_zoom);
return Fl::run();
}
/* end of file */
--------------
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