fd5cd80935
This is a big commit and there are too many changes to list them all.
The main changes are:
- rename all CMake build options to 'FLTK_*'
- export library targets with namespace (prefix) 'fltk::'
- standardize shared library target names with suffix '-shared'
- set public build properties on libraries for consumers
- document library names and aliases in README.CMake.txt
- document changes in "Migrating Code from FLTK 1.3 to 1.4"
- partial backwards compatibility for old user projects
Included but not directly related changes:
- fix Windows (Visual Studio) DLL build
- add CMake function fl_debug_target() to show target properties
- don't build test programs if FLTK is a subproject
- internal: reformat CMake code: remove space before '('
Thanks to Matthias and Manolo for their help, testing, and feeback.
66 lines
2.8 KiB
C++
66 lines
2.8 KiB
C++
//
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// Simple demo of drawing an "X" in Cairo (antialiased lines)
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//
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// Copyright 1998-2022 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.H> // includes <FL/fl_config.h>
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#ifdef FLTK_HAVE_CAIRO // Builds example code only if cairo enabled
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#include <FL/Fl_Cairo_Window.H>
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// Cairo rendering cb called during Fl_Cairo_Window::draw()
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static void my_cairo_draw_cb(Fl_Cairo_Window *window, cairo_t *cr) {
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const double xmax = (window->w() - 1);
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const double ymax = (window->h() - 1);
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// Set antialiasing mode. We could check the Cairo version at compile time but we'd
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// also have to check the runtime version which would make this demo too complicated.
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// CAIRO_ANTIALIAS_BEST is available since Cairo version 1.12,
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// CAIRO_ANTIALIAS_DEFAULT is available since Cairo version 1.0.
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cairo_set_antialias(cr, CAIRO_ANTIALIAS_DEFAULT); // use default antialiasing
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// Draw orange "X"
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// Draws an X to four corners of resizable window.
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// See Fl_Cairo_Window docs for more info.
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//
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cairo_set_line_width(cr, 1.00); // line width for drawing
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cairo_set_source_rgb(cr, 1.0, 0.5, 0.0); // orange
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cairo_move_to(cr, 0.0, 0.0); cairo_line_to(cr, xmax, ymax); // draw diagonal "\"
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cairo_move_to(cr, 0.0, ymax); cairo_line_to(cr, xmax, 0.0); // draw diagonal "/"
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cairo_stroke(cr); // stroke the lines
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}
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int main(int argc, char **argv) {
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Fl_Cairo_Window window(300, 300, "Cairo Draw 'X'");
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window.color(FL_BLACK); // cairo window's default bg color
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window.size_range(50,50,-1,-1); // allow resize 50,50 and up
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window.resizable(&window); // allow window to be resized
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window.set_draw_cb(my_cairo_draw_cb); // draw callback for cairo drawing
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window.show(argc, argv);
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return Fl::run();
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}
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// The code that follows just allows the example to build even if cairo wasn't enabled.
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#else // (!FLTK_HAVE_CAIRO)
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#include <FL/fl_ask.H>
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int main(int argc, char **argv) {
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fl_message_title("This program needs a Cairo enabled FLTK library");
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fl_message("Please configure FLTK with Cairo enabled (--enable-cairo or --enable-cairoext)\n"
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"or one of the CMake options FLTK_OPTION_CAIRO_WINDOW or FLTK_OPTION_CAIRO_EXT, respectively.");
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return 0;
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}
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#endif // (FLTK_HAVE_CAIRO)
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