//
// "$Id: fl_gleam.cxx 11914 2016-09-01 12:41:19Z AlbrechtS $"
//
// "Gleam" drawing routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//
// These box types provide a sort of Clearlooks Glossy scheme
// for FLTK.
//
// Copyright 2001-2005 by Colin Jones.
//
// Modified 2012-2013 by Edmanuel Torres
// This is a new version of the fl_gleam. The gradients are on the top
// an the bottom, the text area looks like in the classic FLTK way.
//

#include <FL/Fl.H>
#include <FL/fl_draw.H>


static void gleam_color(Fl_Color c) {
  Fl::set_box_color(c);
}

static void shade_rect_top_bottom(int x, int y, int w, int h, Fl_Color fg1, Fl_Color fg2, float th) {
  // Draws the shiny using maximum limits
  int h_top    = ((h/2) < (20) ? (h/2) : (20)); // min(h/2,20);
  int h_bottom = ((h/6) < (15) ? (h/6) : (15)); // min(h/6,15);
  int h_flat = h-(h_top+h_bottom);
  int j = 0;
  float step_size_top = h_top>1?(0.999f/(float)(h_top)):1;
  float step_size_bottom = h_bottom>1?(0.999f/(float)(h_bottom)):1;
  // This loop generates the gradient at the top of the widget
  for (float k = 1; k >= 0; k -= step_size_top){
    gleam_color(fl_color_average(fl_color_average(fg1, fg2, th), fg1, k));
    fl_xyline(x, y+j, x+w);
    j++;
  }
  gleam_color(fg1);
  fl_rectf(x, y+h_top, w+1, h_flat);
  // This loop generates the gradient at the bottom of the widget
  for (float k = 1; k >= 0; k -= step_size_bottom){
    gleam_color(fl_color_average(fg1,fl_color_average(fg1, fg2, th), k));
    fl_xyline(x, y+j+h_flat-1, x+w);
    j++;
  }
}

static void shade_rect_top_bottom_up(int x, int y, int w, int h, Fl_Color bc, float th) {
  shade_rect_top_bottom(x,y,w,h,bc,FL_WHITE,th);
}

static void shade_rect_top_bottom_down(int x, int y, int w, int h, Fl_Color bc, float th) {
  shade_rect_top_bottom(x,y,w,h,bc,FL_BLACK,th);
}

static void frame_rect(int x, int y, int w, int h, Fl_Color fg1, Fl_Color fg2, Fl_Color lc) {
  gleam_color(fg1);
  fl_yxline(x, y+h-1,  y+1);         //Go from bottom to top left side
  fl_yxline(x+w, y+h-1,  y+1);     //Go from bottom to top right side
  fl_xyline(x+1, y, x+w-1);         //Go across the top
  fl_xyline(x+1, y+h, x+w-1);     //Go across the bottom
  gleam_color(fg2);
  fl_yxline(x+1, y+h-2, y+2);     //Go from bottom to top left side
  fl_yxline(x+w-1, y+h-2, y+2); //Go from bottom to top right side
  gleam_color(lc);
  fl_xyline(x+2, y+1, x+w-3);     //Go across the top
  fl_xyline(x+2, y+h-1, x+w-3); //Go across the bottom
}

static void frame_rect_up(int x, int y, int w, int h, Fl_Color bc, Fl_Color lc, float th1, float th2) {
  frame_rect(x,y,w,h,fl_color_average(fl_darker(bc), FL_BLACK, th1),fl_color_average(bc, FL_WHITE, th2),lc);
}

static void frame_rect_down(int x, int y, int w, int h, Fl_Color bc, Fl_Color lc, float th1, float th2) {
  frame_rect(x,y,w,h,fl_color_average(bc, FL_WHITE, th1),fl_color_average(FL_BLACK, bc, th2),lc);
}

static void up_frame(int x, int y, int w, int h, Fl_Color c) {
  frame_rect_up(x, y, w-1, h-1, c, fl_color_average(c, FL_WHITE, .25f), .55f, .05f);
}

static void up_box(int x, int y, int w, int h, Fl_Color c) {
  shade_rect_top_bottom_up(x+2, y+1, w-5, h-3, c, .15f);
  frame_rect_up(x, y, w-1, h-1, c, fl_color_average(c, FL_WHITE, .05f), .15f, .05f);
}

static void thin_up_box(int x, int y, int w, int h, Fl_Color c) {
  shade_rect_top_bottom_up(x+2, y+1, w-5, h-3, c, .25f);
  frame_rect_up(x, y, w-1, h-1, c, fl_color_average(c, FL_WHITE, .45f), .25f, .15f);
}

static void down_frame(int x, int y, int w, int h, Fl_Color c) {
  frame_rect_down(x, y, w-1, h-1, fl_darker(c), fl_darker(c), .25f, .95f);
}

static void down_box(int x, int y, int w, int h, Fl_Color c) {
  shade_rect_top_bottom_down(x+1, y+1, w-3, h-3, c, .65f);
  frame_rect_down(x, y, w-1, h-1, c, fl_color_average(c, FL_BLACK, .05f), .05f, .95f);
}

static void thin_down_box(int x, int y, int w, int h, Fl_Color c) {
  shade_rect_top_bottom_down(x+1, y+1, w-3, h-3, c, .85f);
  frame_rect_down(x, y, w-1, h-1, c, fl_color_average(c, FL_BLACK, .45f), .35f, 0.85f);
}

extern void fl_internal_boxtype(Fl_Boxtype, Fl_Box_Draw_F*);

Fl_Boxtype fl_define_FL_GLEAM_UP_BOX() {
  fl_internal_boxtype(_FL_GLEAM_UP_BOX, up_box);
  fl_internal_boxtype(_FL_GLEAM_DOWN_BOX, down_box);
  fl_internal_boxtype(_FL_GLEAM_UP_FRAME, up_frame);
  fl_internal_boxtype(_FL_GLEAM_DOWN_FRAME, down_frame);
  fl_internal_boxtype(_FL_GLEAM_THIN_UP_BOX, thin_up_box);
  fl_internal_boxtype(_FL_GLEAM_THIN_DOWN_BOX, thin_down_box);
  fl_internal_boxtype(_FL_GLEAM_ROUND_UP_BOX, up_box);
  fl_internal_boxtype(_FL_GLEAM_ROUND_DOWN_BOX, down_box);
  return _FL_GLEAM_UP_BOX;
}


//
// End of "$Id: fl_gleam.cxx 11914 2016-09-01 12:41:19Z AlbrechtS $".
//

