test/image.cxx

   1 //
   2 // "$Id: image.cxx 7903 2010-11-28 21:06:39Z matt $"
   3 //
   4 // Fl_Image test program for the Fast Light Tool Kit (FLTK).
   5 //
   6 // Notice that Fl_Image is for a static, multiple-reuse image, such
   7 // as an icon or postage stamp.  Use fl_draw_image to go directly
   8 // from an buffered image that changes often.
   9 //
  10 // Copyright 1998-2010 by Bill Spitzak and others.
  11 //
  12 // This library is free software; you can redistribute it and/or
  13 // modify it under the terms of the GNU Library General Public
  14 // License as published by the Free Software Foundation; either
  15 // version 2 of the License, or (at your option) any later version.
  16 //
  17 // This library is distributed in the hope that it will be useful,
  18 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 // Library General Public License for more details.
  21 //
  22 // You should have received a copy of the GNU Library General Public
  23 // License along with this library; if not, write to the Free Software
  24 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  25 // USA.
  26 //
  27 // Please report all bugs and problems on the following page:
  28 //
  29 //     http://www.fltk.org/str.php
  30 //
  31
  32 #include <FL/Fl.H>
  33 #include <FL/Fl_Double_Window.H>
  34 #include <FL/Fl_Button.H>
  35 #include <FL/Fl_Image.H>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <math.h>
  39
  40 int width = 100;
  41 int height = 100;
  42 uchar *image;
  43
  44 void make_image() {
  45   image = new uchar[4*width*height];
  46   uchar *p = image;
  47   for (int y = 0; y < height; y++) {
  48     double Y = double(y)/(height-1);
  49     for (int x = 0; x < width; x++) {
  50       double X = double(x)/(width-1);
  51       *p++ = uchar(255*((1-X)*(1-Y))); // red in upper-left
  52       *p++ = uchar(255*((1-X)*Y));      // green in lower-left
  53       *p++ = uchar(255*(X*Y));  // blue in lower-right
  54       X -= 0.5;
  55       Y -= 0.5;
  56       int alpha = (int)(255 * sqrt(X * X + Y * Y));
  57       if (alpha < 255) *p++ = uchar(alpha);     // alpha transparency
  58       else *p++ = 255;
  59       Y += 0.5;
  60     }
  61   }
  62 }
  63
  64 #include <FL/Fl_Toggle_Button.H>
  65
  66 Fl_Toggle_Button *leftb,*rightb,*topb,*bottomb,*insideb,*overb,*inactb;
  67 Fl_Button *b;
  68 Fl_Double_Window *w;
  69
  70 void button_cb(Fl_Widget *,void *) {
  71   int i = 0;
  72   if (leftb->value()) i |= FL_ALIGN_LEFT;
  73   if (rightb->value()) i |= FL_ALIGN_RIGHT;
  74   if (topb->value()) i |= FL_ALIGN_TOP;
  75   if (bottomb->value()) i |= FL_ALIGN_BOTTOM;
  76   if (insideb->value()) i |= FL_ALIGN_INSIDE;
  77   if (overb->value()) i |= FL_ALIGN_TEXT_OVER_IMAGE;
  78   b->align(i);
  79   if (inactb->value()) b->deactivate();
  80   else b->activate();
  81   w->redraw();
  82 }
  83
  84 #include <FL/x.H>
  85 #if !defined(WIN32) && !defined(__APPLE__)
  86 #include "list_visuals.cxx"
  87 #endif
  88
  89 int visid = -1;
  90 int arg(int argc, char **argv, int &i) {
  91   if (argv[i][1] == 'v') {
  92     if (i+1 >= argc) return 0;
  93     visid = atoi(argv[i+1]);
  94     i += 2;
  95     return 2;
  96   }
  97   return 0;
  98 }
  99
 100 int main(int argc, char **argv) {
 101 #if !defined(WIN32) && !defined(__APPLE__)
 102   int i = 1;
 103
 104   Fl::args(argc,argv,i,arg);
 105
 106   if (visid >= 0) {
 107     fl_open_display();
 108     XVisualInfo templt; int num;
 109     templt.visualid = visid;
 110     fl_visual = XGetVisualInfo(fl_display, VisualIDMask, &templt, &num);
 111     if (!fl_visual) {
 112       fprintf(stderr, "No visual with id %d, use one of:\n",visid);
 113       list_visuals();
 114       exit(1);
 115     }
 116     fl_colormap = XCreateColormap(fl_display, RootWindow(fl_display,fl_screen),
 117                                 fl_visual->visual, AllocNone);
 118     fl_xpixel(FL_BLACK); // make sure black is allocated in overlay visuals
 119   } else {
 120     Fl::visual(FL_RGB);
 121   }
 122 #endif
 123
 124   Fl_Double_Window window(400,400); ::w = &window;
 125   window.color(FL_WHITE);
 126   Fl_Button b(140,160,120,120,"Image w/Alpha"); ::b = &b;
 127
 128   Fl_RGB_Image *rgb;
 129   Fl_Image *dergb;
 130
 131   make_image();
 132   rgb = new Fl_RGB_Image(image, width, height,4);
 133   dergb = rgb->copy();
 134   dergb->inactive();
 135
 136   b.image(rgb);
 137   b.deimage(dergb);
 138
 139   leftb = new Fl_Toggle_Button(25,50,50,25,"left");
 140   leftb->callback(button_cb);
 141   rightb = new Fl_Toggle_Button(75,50,50,25,"right");
 142   rightb->callback(button_cb);
 143   topb = new Fl_Toggle_Button(125,50,50,25,"top");
 144   topb->callback(button_cb);
 145   bottomb = new Fl_Toggle_Button(175,50,50,25,"bottom");
 146   bottomb->callback(button_cb);
 147   insideb = new Fl_Toggle_Button(225,50,50,25,"inside");
 148   insideb->callback(button_cb);
 149   overb = new Fl_Toggle_Button(25,75,100,25,"text over");
 150   overb->callback(button_cb);
 151   inactb = new Fl_Toggle_Button(125,75,100,25,"inactive");
 152   inactb->callback(button_cb);
 153   window.resizable(window);
 154   window.end();
 155   window.show(argc, argv);
 156   return Fl::run();
 157 }
 158
 159 //
 160 // End of "$Id: image.cxx 7903 2010-11-28 21:06:39Z matt $".
 161 //