--- /dev/null
+// Copyright (C) 2007, 2008 Ben Asselstine
+//
+// This program 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 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+// 02110-1301, USA.
+
+#include "line-chart.h"
+#include "ucompose.hpp"
+#include <cairomm/context.h>
+
+LineChart::LineChart(std::list<std::list<unsigned int> > lines,
+ std::list<Gdk::Color> colours,
+ unsigned int max_height_value,
+ std::string x_axis_description,
+ std::string y_axis_description)
+{
+ d_lines = lines;
+ d_colours = colours;
+ d_max_height_value = max_height_value;
+ d_x_axis_description = x_axis_description;
+ d_y_axis_description = y_axis_description;
+ d_x_indicator = -1;
+}
+
+LineChart::~LineChart()
+{
+}
+
+bool LineChart::on_expose_event(GdkEventExpose* event)
+{
+ // This is where we draw on the window
+ Glib::RefPtr<Gdk::Window> window = get_window();
+ if(window)
+ {
+ Gtk::Allocation allocation = get_allocation();
+ const int width = allocation.get_width();
+ const int height = allocation.get_height();
+
+ // coordinates for the center of the window
+ int xc, yc;
+ xc = width / 2;
+ yc = height / 2;
+ int origin_x = 0;
+ int origin_y = height;
+ unsigned int hoffs = 30;
+ unsigned int voffs = 30;
+
+ Cairo::RefPtr<Cairo::Context> cr = window->create_cairo_context();
+
+ // clip to the area indicated by the expose event so that we only redraw
+ // the portion of the window that needs to be redrawn
+ cr->rectangle(event->area.x, event->area.y,
+ event->area.width, event->area.height);
+ cr->clip();
+ cr->set_source_rgb (0.8, 0.8, 0.8);
+ cr->set_line_width(1000.0);
+ cr->move_to(0,0);
+ cr->line_to(width,height);
+ cr->stroke();
+
+ cr->set_line_width(1.0);
+ //loop through the outer list, and operate on the inner lists
+ unsigned int max_turn = 0;
+ std::list<std::list<unsigned int> >::iterator line = d_lines.begin();
+ for (; line!= d_lines.end(); line++)
+ {
+ if ((*line).size() > max_turn)
+ max_turn = (*line).size();
+ }
+
+ if (d_max_height_value == 0)
+ {
+ line = d_lines.begin();
+ for (; line!= d_lines.end(); line++)
+ {
+ std::list<unsigned int>::iterator it = (*line).begin();
+ for (; it != (*line).end(); it++)
+ {
+ if (*it > d_max_height_value)
+ d_max_height_value = *it;
+ }
+ }
+ }
+
+ // ensure the border is big enough for the label.
+ Glib::RefPtr<Pango::Layout> layout = Glib::wrap (pango_cairo_create_layout (cr->cobj ()));
+ std::string text_font = "Sans 8";
+ Pango::FontDescription font_desc (text_font);
+ layout->set_font_description (font_desc);
+
+ layout->set_text(String::ucompose("%1", d_max_height_value));
+ int w, h;
+ layout->get_pixel_size (w, h);
+ if (w * (hoffs / 4) > hoffs)
+ hoffs = w + (hoffs / 4);
+
+ std::list<Gdk::Color>::iterator cit = d_colours.begin();
+ line = d_lines.begin();
+ for (; line!= d_lines.end(), cit != d_colours.end(); line++, cit++)
+ {
+ //okay, here's my line and it's colour,
+ double red = (double)(*cit).get_red() /65535.0;
+ double green = (double)(*cit).get_green() /65535.0;
+ double blue = (double)(*cit).get_blue() /65535.0;
+ cr->set_source_rgb(red, green, blue);
+ std::list<unsigned int>::iterator it = (*line).begin();
+ unsigned int turn = 1;
+ cr->move_to(origin_x + hoffs, origin_y - voffs);
+ for (; it != (*line).end(); it++, turn++)
+ {
+ cr->line_to((((float)turn / (float)max_turn) *
+ (width - (hoffs * 2))) + hoffs,
+ height - (voffs * 2) -
+ (((float)*it / (float)d_max_height_value) *
+ (height - (voffs * 2.0))) + voffs);
+ }
+ cr->stroke();
+ }
+
+ //draw horizontal axis
+ cr->set_source_rgb(0.3, 0.3, 0.3);
+ cr->move_to(origin_x + hoffs, origin_y - voffs);
+ cr->line_to((width - (hoffs * 2)) + hoffs, origin_y - voffs);
+ cr->stroke();
+
+ //draw ticks on the horizontal axis
+ cr->set_source_rgb(0.3, 0.3, 0.3);
+ cr->move_to(origin_x + hoffs, origin_y - voffs + 1);
+ cr->line_to(origin_x + hoffs, origin_y - voffs + (voffs / 4) + 1);
+ cr->stroke();
+
+ cr->move_to((width - (hoffs * 2)) + hoffs - 1, origin_y - voffs + 1);
+ cr->line_to((width - (hoffs * 2)) + hoffs - 1,
+ origin_y - voffs + (voffs / 4) + 1);
+ cr->stroke();
+
+ //draw vertical axis
+ cr->set_source_rgb(0.3, 0.3, 0.3);
+ cr->move_to(origin_x + hoffs, origin_y - voffs);
+ cr->line_to(origin_x + hoffs, voffs);
+ cr->stroke();
+
+ //draw ticks on the vertical axis
+ cr->move_to(origin_x + hoffs - 1, origin_y - voffs);
+ cr->line_to(origin_x + hoffs - (hoffs / 4) - 1, origin_y - voffs);
+ cr->stroke();
+ cr->move_to(origin_x + hoffs - 1, voffs + 1);
+ cr->line_to(origin_x + hoffs - (hoffs / 4) - 1, voffs + 1);
+ cr->stroke();
+
+ //draw the indicator line
+ if (d_x_indicator > -1 && (unsigned int) d_x_indicator <= max_turn)
+ {
+ //draw a line at turn x
+ cr->set_source_rgb(0.0, 0.0, 0.0);
+ cr->move_to((((float)d_x_indicator/ (float)max_turn) * (width - (hoffs * 2))) + hoffs, voffs);
+ cr->line_to((((float)d_x_indicator/ (float)max_turn) * (width - (hoffs * 2))) + hoffs, height - voffs);
+ cr->stroke();
+ }
+
+ // draw the labels on the horizontal axis
+ layout->set_font_description (font_desc);
+ layout->set_text("0");
+ layout->get_pixel_size (w, h);
+ cr->move_to(hoffs - (w / 2), origin_y - voffs + (voffs / 4));
+ cr->set_source_rgb (0.0, 0.0, 0.0);
+ cr->set_operator (Cairo::OPERATOR_ATOP);
+ pango_cairo_show_layout (cr->cobj (), layout->gobj ());
+
+ layout->set_text(String::ucompose("%1", max_turn));
+ layout->get_pixel_size (w, h);
+ cr->move_to((width - (hoffs * 2)) + hoffs - (w / 2),
+ origin_y - voffs + (voffs / 4) + 1);
+ cr->set_source_rgb (0.0, 0.0, 0.0);
+ cr->set_operator (Cairo::OPERATOR_ATOP);
+ pango_cairo_show_layout (cr->cobj (), layout->gobj ());
+
+ layout->set_text(d_y_axis_description);
+ layout->get_pixel_size (w, h);
+ cr->move_to((width / 2 - (hoffs * 1)) + hoffs - (w / 2),
+ origin_y - voffs + (voffs / 2) + 1);
+ cr->set_source_rgb (0.0, 0.0, 0.0);
+ cr->set_operator (Cairo::OPERATOR_ATOP);
+ pango_cairo_show_layout (cr->cobj (), layout->gobj ());
+
+ // draw the labels on the vertical axis
+ layout->set_font_description (font_desc);
+ layout->set_text("0");
+ layout->get_pixel_size (w, h);
+ cr->move_to(origin_x + hoffs - (hoffs / 4) - 1 - w, origin_y - voffs - (h/2));
+ cr->set_source_rgb (0.0, 0.0, 0.0);
+ cr->set_operator (Cairo::OPERATOR_ATOP);
+ pango_cairo_show_layout (cr->cobj (), layout->gobj ());
+
+ layout->set_text(String::ucompose("%1", d_max_height_value));
+ layout->get_pixel_size (w, h);
+ cr->move_to(origin_x + hoffs - (hoffs / 4) - 1 - w, voffs + 1 - (h/2));
+ cr->set_source_rgb (0.0, 0.0, 0.0);
+ cr->set_operator (Cairo::OPERATOR_ATOP);
+ pango_cairo_show_layout (cr->cobj (), layout->gobj ());
+
+ PangoContext *context;
+ PangoCairoFontMap *fontmap;
+ fontmap = (PangoCairoFontMap *) pango_cairo_font_map_get_default ();
+ context = pango_cairo_font_map_create_context (fontmap);
+ pango_context_set_base_gravity(context, PANGO_GRAVITY_EAST);
+ pango_context_set_gravity_hint(context, PANGO_GRAVITY_HINT_STRONG);
+ layout->context_changed();
+
+ layout->set_text(d_x_axis_description);
+ layout->get_pixel_size (w, h);
+ cr->move_to(0, height - (voffs * 2) -
+ (0.50 * (height - (voffs * 2.0))) + voffs + (w / 2));
+ cr->rotate(-90 / (180.0 / G_PI));
+ pango_cairo_show_layout (cr->cobj (), layout->gobj ());
+
+ }
+
+ return true;
+}
+
+void LineChart::set_x_indicator(int x)
+{
+ d_x_indicator = x;
+ Glib::RefPtr<Gdk::Window> window = get_window();
+ if(window)
+ {
+ Gtk::Allocation allocation = get_allocation();
+ const int width = allocation.get_width();
+ const int height = allocation.get_height();
+ GdkEventExpose event;
+ event.area.x = 0;
+ event.area.y = 0;
+ event.area.height = height;
+ event.area.width = width;
+ on_expose_event(&event);
+ }
+}
projects / lordsawar / blobdiff