> My problem is to draw any line or rectangle on any image.
> Suppose if i draw an image (using fl_draw_image) on some part
> of window. Then i want to draw any rectangle oe line on this
> image. That i have tried in draw function(after drawing
> image) and outside the draw function. But line/rectangle never appear.
I'm not sure I understand what you want - but here's a worked example -
probably unnecessarily complex, that I hacked together. Does this help?
/***********************************************************************
*/
// Compile as:
// fltk-config --use-images --compile image_draw.cxx
//
// invoke as:
// image_draw {something.jpg | something.png | etc...}
//
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <FL/Fl.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Shared_Image.H>
#include <Fl/fl_draw.H>
Fl_Double_Window *outer_win;
Fl_Shared_Image *img;
Fl_RGB_Image *rgbimg = NULL;
/***********************************************************************
*/
class vw_box : public Fl_Box {
protected:
void draw(void);
int iw, ih, id;
char *data;
public:
vw_box(int X, int Y, int W, int H, const char *L=0) :
Fl_Box(X,Y,W,H,L)
{data = NULL;}
void set_data(char *newdat, int W, int H, int D);
};
/***********************************************************************
*/
void vw_box::set_data(char *newdat, int W, int H, int D) {
iw = W; ih = H; id = D;
if (data) delete [] data;
data = newdat;
}
/***********************************************************************
*/
void vw_box::draw(void) {
if (!data) return;
short wd = w(); short ht = h();
short xoff = 0; short yoff = 0;
static short xp = 50, yp = 50, dx = 10, dy = 10;
xp += dx; yp += dy;
if (xp < x()) {xp = x(); dx = -dx;}
if ((xp+100) > (x()+wd)) {xp = (x()+wd-100); dx = -dx;}
if (yp < y()) {yp = y(); dy = -dy;}
if ((yp+100) > (y()+ht)) {yp = (y()+ht-100); dy = -dy;}
if (ih < ht) yoff = (ht - ih) / 2;
if (iw < wd) xoff = (wd - iw) / 2;
short xpos = x() + xoff;
short ypos = y() + yoff;
/* Ensure that the full window is redrawn */
Fl_Box::draw();
fl_push_no_clip();
/* Redraw the whole image */
fl_draw_image((const uchar *)data, xpos, ypos, iw, ih, id);
// draw a box on top of the image
fl_rect(xp, yp, 100, 100, FL_RED);
fl_pop_clip();
}
/***********************************************************************
*/
vw_box *box_1;
/***********************************************************************
*/
void load_file(const char *n) {
if (img) img->release();
img = Fl_Shared_Image::get(n);
if (!img) {
puts("Image file format not recognized!");
fflush(stdout);
return;
}
Fl_Image *temp;
if (img->w() > img->h()) temp = img->copy(box_1->w(), box_1->h()
* img->h() / img->w());
else temp = img->copy(box_1->w() * img->w() / img->h(),
box_1->h());
img->release();
img = (Fl_Shared_Image *)temp;
box_1->image(img);
box_1->set_data((char *)img->data()[0], img->w(), img->h(),
img->d());
box_1->redraw();
}
/***********************************************************************
*/
void quit_cb(Fl_Button*, void*) {
outer_win->hide();
}
/***********************************************************************
*/
void animate_box(void*) {
box_1->redraw();
Fl::repeat_timeout(0.1, animate_box);
}
/***********************************************************************
*/
int main(int argc, char **argv) {
fl_register_images();
Fl::get_system_colors();
outer_win = new Fl_Double_Window(600, 650, "Picture Window");
box_1 = new vw_box(5, 5, 590, 500);
box_1->box(FL_FLAT_BOX);
Fl_Button *quit = new Fl_Button(535, 615, 60, 30);
quit->label("Quit");
quit->callback((Fl_Callback*)quit_cb);
outer_win->end();
if (argv[1]) load_file(argv[1]);
outer_win->show();
Fl::add_timeout(0.1, animate_box);
return Fl::run();
}
/* End of File */
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Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14
3EL
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