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//
// "$Id: arc.cxx 5115 2006-05-12 16:00:00Z fabien $"
//
// Arc drawing test program for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#include <config.h>
#ifdef FLTK_HAVE_CAIRO
#include <FL/Fl_Cairo_Window.H>
#include <FL/Fl_Box.H>
#include <FL/x.H>
#include <FL/fl_draw.H>
#include <FL/math.h>
#define DEF_WIDTH 0.03
// uncomment the following line to enable cairo context autolink feature:
// #define AUTOLINK
// put your drawing stuff here
float drawargs[7] = {90, 90, 100, 100, 0, 360, 0};
const char* name[7] = {"X", "Y", "W", "H", "start", "end", "rotate"};
static void centered_text(cairo_t* cr, double x0,double y0,double w0,double h0, const char * my_text) {
cairo_select_font_face (cr, "Sans", CAIRO_FONT_SLANT_OBLIQUE,CAIRO_FONT_WEIGHT_BOLD);
cairo_set_source_rgba (cr, 0.9, 0.9, 0.4, 0.6);
cairo_text_extents_t extents;
cairo_text_extents (cr, my_text, &extents);
double x = (extents.width/2 + extents.x_bearing);
double y = (extents.height/2 + extents.y_bearing);
cairo_move_to (cr, x0+w0/2-x, y0+h0/2 - y);
cairo_text_path(cr,my_text);
cairo_fill_preserve (cr);
cairo_set_source_rgba (cr, 0, 0, 0,1);
cairo_set_line_width (cr, 0.004);
cairo_stroke (cr);
cairo_set_line_width (cr, DEF_WIDTH);
}
static void round_button(cairo_t* cr, double x0, double y0,
double rect_width, double rect_height, double radius,
double r, double g, double b) {
double x1,y1;
x1=x0+rect_width;
y1=y0+rect_height;
if (!rect_width || !rect_height)
return;
if (rect_width/2<radius) {
if (rect_height/2<radius) {
cairo_move_to (cr, x0, (y0 + y1)/2);
cairo_curve_to (cr, x0 ,y0, x0, y0, (x0 + x1)/2, y0);
cairo_curve_to (cr, x1, y0, x1, y0, x1, (y0 + y1)/2);
cairo_curve_to (cr, x1, y1, x1, y1, (x1 + x0)/2, y1);
cairo_curve_to (cr, x0, y1, x0, y1, x0, (y0 + y1)/2);
} else {
cairo_move_to (cr, x0, y0 + radius);
cairo_curve_to (cr, x0 ,y0, x0, y0, (x0 + x1)/2, y0);
cairo_curve_to (cr, x1, y0, x1, y0, x1, y0 + radius);
cairo_line_to (cr, x1 , y1 - radius);
cairo_curve_to (cr, x1, y1, x1, y1, (x1 + x0)/2, y1);
cairo_curve_to (cr, x0, y1, x0, y1, x0, y1- radius);
}
} else {
if (rect_height/2<radius) {
cairo_move_to (cr, x0, (y0 + y1)/2);
cairo_curve_to (cr, x0 , y0, x0 , y0, x0 + radius, y0);
cairo_line_to (cr, x1 - radius, y0);
cairo_curve_to (cr, x1, y0, x1, y0, x1, (y0 + y1)/2);
cairo_curve_to (cr, x1, y1, x1, y1, x1 - radius, y1);
cairo_line_to (cr, x0 + radius, y1);
cairo_curve_to (cr, x0, y1, x0, y1, x0, (y0 + y1)/2);
} else {
cairo_move_to (cr, x0, y0 + radius);
cairo_curve_to (cr, x0 , y0, x0 , y0, x0 + radius, y0);
cairo_line_to (cr, x1 - radius, y0);
cairo_curve_to (cr, x1, y0, x1, y0, x1, y0 + radius);
cairo_line_to (cr, x1 , y1 - radius);
cairo_curve_to (cr, x1, y1, x1, y1, x1 - radius, y1);
cairo_line_to (cr, x0 + radius, y1);
cairo_curve_to (cr, x0, y1, x0, y1, x0, y1- radius);
}
}
cairo_close_path (cr);
cairo_pattern_t *pat=
//cairo_pattern_create_linear (0.0, 0.0, 0.0, 1.0);
cairo_pattern_create_radial (0.25, 0.24, 0.11, 0.24, 0.14, 0.35);
cairo_pattern_set_extend (pat, CAIRO_EXTEND_REFLECT);
cairo_pattern_add_color_stop_rgba (pat, 1.0, r, g, b, 1);
cairo_pattern_add_color_stop_rgba (pat, 0.0, 1, 1, 1, 1);
cairo_set_source (cr, pat);
cairo_fill_preserve (cr);
cairo_pattern_destroy (pat);
//cairo_set_source_rgb (cr, 0.5,0.5,1); cairo_fill_preserve (cr);
cairo_set_source_rgba (cr, 0, 0, 0.5, 0.3);
cairo_stroke (cr);
cairo_set_font_size (cr, 0.08);
centered_text(cr,x0,y0,rect_width, rect_height, "FLTK loves Cairo!");
}
// The cairo rendering cb called during Fl_Cairo_Window::draw() :
static void my_cairo_draw_cb(Fl_Cairo_Window* window, cairo_t* cr) {
int w= window->w(), h = window->h();
cairo_set_line_width (cr, DEF_WIDTH);
cairo_scale (cr, w,h);
round_button(cr,0.1,0.05,0.8,0.2,0.4,0,0,1);
round_button(cr,0.1,0.35,0.8,0.2,0.4,1,0,0);
round_button(cr,0.1,0.65,0.8,0.2,0.4,0,1,0);
return;
}
int main(int argc, char** argv) {
#ifdef AUTOLINK
Fl::cairo_autolink_context(true);
#endif
Fl_Cairo_Window window(300,300);
window.resizable(&window);
window.color(FL_WHITE);
window.set_draw_cb(my_cairo_draw_cb);
window.show(argc,argv);
return Fl::run();
}
#else
#include <FL/fl_ask.H>
int main(int argc, char** argv) {
fl_message("please configure fltk with CAIRO enabled (--enable-cairo or --enable-cairoext)");
return 0;
}
#endif
//
// End of "$Id: arc.cxx 5115 2006-05-12 16:00:00Z fabien $".
//
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