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ManoloFLTK
f0c8f5aeb1
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115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
//
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// OpenGL image-drawing test program for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 2026 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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#include <FL/Fl_Gl_Window.H>
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#include <FL/Fl_Shared_Image.H>
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#include <FL/Fl_File_Chooser.H>
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#include <FL/Fl_Menu_Bar.H>
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#include <FL/gl.h>
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class image_background_box : public Fl_Widget {
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public:
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image_background_box(int x, int y, int w, int h) : Fl_Widget(x, y, w, h, NULL) {}
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void draw() override {
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gl_color(FL_WHITE);
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gl_rectf(x(), y(), w(), h());
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gl_color(color());
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int startX;
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for (int Y = y(); Y < y()+h(); Y += 5) {
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startX = Y % 10;
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for (int X = startX; X < w(); X += 10) {
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gl_rectf(X, Y, 5, 5);
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}
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}
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fl_color(FL_DARK_BLUE); // Effective only when the drawn image is an Fl_Bitmap
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Fl_Image *img = image();
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if (img) img->draw((w() - img->w())/2, y() + (h() - img->h())/2);
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}
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};
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void chooser_cb(Fl_Widget *, class Gl_Image_Window *mainwin);
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void close_cb(Fl_Widget *, void *) {
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Fl::first_window()->hide();
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}
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Fl_Menu_Item items[] = {
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{ "File", 0, 0, 0, FL_SUBMENU},
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{ "Choose image file…", 0, (Fl_Callback*)chooser_cb},
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{ "Quit", 0, close_cb},
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{0},
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{0},
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};
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class Gl_Image_Window : public Fl_Gl_Window {
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const Fl_Image *img_;
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image_background_box *box_;
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public:
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Gl_Image_Window(int w, int h, const char *t) : Fl_Gl_Window(w, h, t) {
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img_ = NULL;
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begin();
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Fl_Menu_Bar *bar = new Fl_Menu_Bar(0, 0, w, 30);
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bar->menu(items);
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items[1].user_data(this);
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box_ = new image_background_box(0, 30, w, h - 30);
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box_->color(FL_GRAY);
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end();
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resizable(box_);
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}
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void set_image(const Fl_Image *img) {
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if (img_) ((Fl_Image*)img_)->release();
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img_ = img;
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box_->image((Fl_Image*)img);
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((Fl_Image*)img)->scale(box_->w(), box_->h());
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redraw();
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}
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void resize(int x, int y, int w, int h) override {
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Fl_Gl_Window::resize(x,y,w,h);
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if (img_) ((Fl_Image*)img_)->scale(box_->w(), box_->h());
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}
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void draw() override {
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Fl_Gl_Window::draw(); // Draw FLTK child widgets.
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}
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};
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void chooser_cb(Fl_Widget *, Gl_Image_Window *mainwin) {
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char *fname = fl_file_chooser("select image file", "*.{png,jpg,gif,svg,svgz,xbm,xpm,ico}", NULL, 0);
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if (fname) {
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Fl_Shared_Image *shared = Fl_Shared_Image::get(fname);
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if (shared && !shared->fail()) {
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mainwin->copy_label(fname);
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mainwin->set_image(shared);
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}
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}
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}
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int main(int argc, char **argv) {
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fl_register_images();
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Gl_Image_Window mainwin(600, 600, "GL Image Viewer");
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mainwin.show(argc, argv);
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Fl::run();
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delete mainwin.child(1)->image();
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return 0;
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}
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