test/cairo_test.cxx

   1 //
   2 // "$Id: arc.cxx 5115 2006-05-12 16:00:00Z fabien $"
   3 //
   4 // Arc drawing test program for the Fast Light Tool Kit (FLTK).
   5 //
   6 // Copyright 1998-2010 by Bill Spitzak and others.
   7 //
   8 // This library is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU Library General Public
  10 // License as published by the Free Software Foundation; either
  11 // version 2 of the License, or (at your option) any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // Library General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU Library General Public
  19 // License along with this library; if not, write to the Free Software
  20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21 // USA.
  22 //
  23 // Please report all bugs and problems on the following page:
  24 //
  25 //     http://www.fltk.org/str.php
  26 //
  27
  28 #include <config.h>
  29
  30 #ifdef FLTK_HAVE_CAIRO
  31
  32 #include <FL/Fl_Cairo_Window.H>
  33 #include <FL/Fl_Box.H>
  34 #include <FL/x.H>
  35 #include <FL/fl_draw.H>
  36 #include <FL/math.h>
  37 #define DEF_WIDTH 0.03
  38
  39 // uncomment the following line to enable cairo context autolink feature:
  40 // #define AUTOLINK
  41
  42 // put your drawing stuff here
  43 float drawargs[7] = {90, 90, 100, 100, 0, 360, 0};
  44 const char* name[7] = {"X", "Y", "W", "H", "start", "end", "rotate"};
  45
  46
  47 static void centered_text(cairo_t* cr, double x0,double y0,double w0,double h0, const char * my_text) {
  48     cairo_select_font_face (cr, "Sans", CAIRO_FONT_SLANT_OBLIQUE,CAIRO_FONT_WEIGHT_BOLD);
  49     cairo_set_source_rgba (cr, 0.9, 0.9, 0.4, 0.6);
  50     cairo_text_extents_t extents;
  51     cairo_text_extents (cr, my_text, &extents);
  52     double x = (extents.width/2 + extents.x_bearing);
  53     double y = (extents.height/2 + extents.y_bearing);
  54     cairo_move_to  (cr, x0+w0/2-x, y0+h0/2 - y);
  55     cairo_text_path(cr,my_text);
  56     cairo_fill_preserve (cr);
  57     cairo_set_source_rgba (cr, 0, 0, 0,1);
  58     cairo_set_line_width (cr, 0.004);
  59     cairo_stroke (cr);
  60     cairo_set_line_width (cr, DEF_WIDTH);
  61
  62
  63 }
  64
  65 static void round_button(cairo_t* cr, double x0, double y0,
  66                   double rect_width, double rect_height, double radius,
  67                   double r, double g, double b) {
  68
  69     double x1,y1;
  70
  71
  72     x1=x0+rect_width;
  73     y1=y0+rect_height;
  74     if (!rect_width || !rect_height)
  75         return;
  76     if (rect_width/2<radius) {
  77         if (rect_height/2<radius) {
  78             cairo_move_to  (cr, x0, (y0 + y1)/2);
  79             cairo_curve_to (cr, x0 ,y0, x0, y0, (x0 + x1)/2, y0);
  80             cairo_curve_to (cr, x1, y0, x1, y0, x1, (y0 + y1)/2);
  81             cairo_curve_to (cr, x1, y1, x1, y1, (x1 + x0)/2, y1);
  82             cairo_curve_to (cr, x0, y1, x0, y1, x0, (y0 + y1)/2);
  83         } else {
  84             cairo_move_to  (cr, x0, y0 + radius);
  85             cairo_curve_to (cr, x0 ,y0, x0, y0, (x0 + x1)/2, y0);
  86             cairo_curve_to (cr, x1, y0, x1, y0, x1, y0 + radius);
  87             cairo_line_to (cr, x1 , y1 - radius);
  88             cairo_curve_to (cr, x1, y1, x1, y1, (x1 + x0)/2, y1);
  89             cairo_curve_to (cr, x0, y1, x0, y1, x0, y1- radius);
  90         }
  91     } else {
  92         if (rect_height/2<radius) {
  93             cairo_move_to  (cr, x0, (y0 + y1)/2);
  94             cairo_curve_to (cr, x0 , y0, x0 , y0, x0 + radius, y0);
  95             cairo_line_to (cr, x1 - radius, y0);
  96             cairo_curve_to (cr, x1, y0, x1, y0, x1, (y0 + y1)/2);
  97             cairo_curve_to (cr, x1, y1, x1, y1, x1 - radius, y1);
  98             cairo_line_to (cr, x0 + radius, y1);
  99             cairo_curve_to (cr, x0, y1, x0, y1, x0, (y0 + y1)/2);
 100         } else {
 101             cairo_move_to  (cr, x0, y0 + radius);
 102             cairo_curve_to (cr, x0 , y0, x0 , y0, x0 + radius, y0);
 103             cairo_line_to (cr, x1 - radius, y0);
 104             cairo_curve_to (cr, x1, y0, x1, y0, x1, y0 + radius);
 105             cairo_line_to (cr, x1 , y1 - radius);
 106             cairo_curve_to (cr, x1, y1, x1, y1, x1 - radius, y1);
 107             cairo_line_to (cr, x0 + radius, y1);
 108             cairo_curve_to (cr, x0, y1, x0, y1, x0, y1- radius);
 109         }
 110     }
 111     cairo_close_path (cr);
 112
 113     cairo_pattern_t *pat=
 114         //cairo_pattern_create_linear (0.0, 0.0,  0.0, 1.0);
 115         cairo_pattern_create_radial (0.25, 0.24, 0.11, 0.24,  0.14, 0.35);
 116     cairo_pattern_set_extend (pat, CAIRO_EXTEND_REFLECT);
 117
 118     cairo_pattern_add_color_stop_rgba (pat, 1.0, r, g, b, 1);
 119     cairo_pattern_add_color_stop_rgba (pat, 0.0, 1, 1, 1, 1);
 120     cairo_set_source (cr, pat);
 121     cairo_fill_preserve (cr);
 122     cairo_pattern_destroy (pat);
 123
 124     //cairo_set_source_rgb (cr, 0.5,0.5,1);    cairo_fill_preserve (cr);
 125     cairo_set_source_rgba (cr, 0, 0, 0.5, 0.3);
 126     cairo_stroke (cr);
 127
 128     cairo_set_font_size (cr, 0.08);
 129     centered_text(cr,x0,y0,rect_width, rect_height, "FLTK loves Cairo!");
 130
 131 }
 132 // The cairo rendering cb called during Fl_Cairo_Window::draw() :
 133 static void my_cairo_draw_cb(Fl_Cairo_Window* window, cairo_t* cr) {
 134
 135   int w= window->w(), h = window->h();
 136
 137     cairo_set_line_width (cr, DEF_WIDTH);
 138     cairo_scale (cr, w,h);
 139
 140     round_button(cr,0.1,0.05,0.8,0.2,0.4,0,0,1);
 141     round_button(cr,0.1,0.35,0.8,0.2,0.4,1,0,0);
 142     round_button(cr,0.1,0.65,0.8,0.2,0.4,0,1,0);
 143     return;
 144 }
 145
 146 int main(int argc, char** argv) {
 147     Fl_Cairo_Window window(300,300);
 148
 149     window.resizable(&window);
 150     window.color(FL_WHITE);
 151     window.set_draw_cb(my_cairo_draw_cb);
 152     window.show(argc,argv);
 153
 154     return Fl::run();
 155 }
 156 #else
 157 #include <FL/fl_ask.H>
 158
 159 int main(int argc, char** argv) {
 160   fl_message("please configure fltk with CAIRO enabled (--enable-cairo or --enable-cairoext)");
 161   return 0;
 162 }
 163 #endif
 164
 165 //
 166 // End of "$Id: arc.cxx 5115 2006-05-12 16:00:00Z fabien $".
 167 //