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