sgpemv2/src/schedulables_widget.cc

// src/schedulables_widget.cc - Copyright 2005, 2006, University
//               of Padova, dept. of Pure and Applied
//               Mathematics
//
// This file is part of SGPEMv2.
//
// This is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// SGPEMv2 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with SGPEMv2; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

#include "schedulables_widget.hh"

#include <cmath>

using namespace sgpem;


SchedulablesWidget::SchedulablesWidget()
  : _ctx(NULL)
{
  // Add other events we want to manage (as mouse clicks)
  // when needed
  add_events(Gdk::EXPOSURE_MASK);	   
}
 

SchedulablesWidget::~SchedulablesWidget()
{
}


void 
SchedulablesWidget::update(const History& history)
{
  // FIXME : write me
}

 
void 
SchedulablesWidget::on_size_request(Gtk::Requisition* requisition)
{
  // FIXME: take correct measures, consider also using a viewport(?)
  *requisition = Gtk::Requisition();
  requisition->width = get_allocation().get_width();
  requisition->height = requisition->width;
}


bool 
SchedulablesWidget::on_expose_event(GdkEventExpose* event)
{
  // Use double buffering or we're CPU-dead

  Glib::RefPtr<Gdk::Window> window = get_window();
  GdkWindow* gdkWindow = window->gobj();
  GdkDrawable* gdkDrawable;
  gint xOffset, yOffset;
  gdk_window_get_internal_paint_info(gdkWindow, &gdkDrawable, &xOffset, &yOffset);

  // Copy new ctx from old one (the buffer); from distant memories,
  // we should use something like create_similar to instantiate a 
  // compatible surface and then copy the buffer to fg
  // So the following two lines WILL HAVE TO CHANGE.
  cairo_t*& cr = _ctx;
  cr = gdk_cairo_create(gdkDrawable); 

  const Gtk::Allocation& allocation = get_allocation();
  int width  = allocation.get_width();
  int height = allocation.get_height();
  
  // Already clip, so that paint hasn't to care about it:
  if(event) 
    {
      cairo_rectangle(cr, event->area.x, event->area.y,
		      event->area.width, event->area.height);
      cairo_clip(cr);
    }
  
  // NOTE: just to try:
  
  // should be calculated dinamically:
  set_size_request(200,400);
  
  // Height should be calculated dynamically?
  cairo_scale(cr, width, width);
  cairo_set_line_width(cr, 0.02);
  cairo_set_source_rgba(cr, 0, 0, 0, 1);
  
  // Draw initial sphere perimeter
  float r = 1.f, g = 0.f, b = 0.f;
  double x = .5, y = .5, radius = .5;
  cairo_save(cr);
  cairo_new_path(cr);
  cairo_arc(cr, x, y, radius, 0, 2*M_PI);
  cairo_pattern_t* grad = cairo_pattern_create_radial(x, y, radius, x, y, radius - .15);
  cairo_pattern_add_color_stop_rgba(grad,  0, r - .2, g - .2, b - .2, 1);
  cairo_pattern_add_color_stop_rgba(grad,  1,      r,      g,      b, 1);
  cairo_set_source(cr, grad);
  cairo_fill_preserve(cr);
  cairo_pattern_destroy(grad);
  cairo_set_source_rgba(cr, 0, 0, 0, 1);
  cairo_set_line_width(cr, radius * .01);
  cairo_stroke(cr);
  cairo_restore(cr);	

  cairo_destroy(cr);
  
  return true; 
}
 

bool 
SchedulablesWidget::on_button_press_event(GdkEventButton* event)
{
  // Not here. Yet.
  return false;
}