4 ** Made by (Johnny Q. Hacker)
5 ** Login <solarion@johnathan>
8 Copyright (C) 2008 Joseph Pingenot
10 This program is free software: you can redistribute it and/or modify
11 it under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation, either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 **Many thanks to Davyd Madeley for the excellent Cairo Widget Tutorial
24 ** at http://gnomejournal.org/article/34/writing-a-widget-using-cairo-and-gtk28
26 ** Started on Thu Jul 17 10:51:32 2008 Johnny Q. Hacker
27 ** Last update Sun May 12 01:17:25 2002 Speed Blue
30 #include "graphwidget.h"
32 G_DEFINE_TYPE(GraphWidget, graph_widget, GTK_TYPE_DRAWING_AREA);
34 struct drawing_context {
40 static void draw_point(gpointer data, gpointer user_data) {
41 struct drawing_context *cxt = (struct drawing_context *) user_data;
42 cairo_arc(cxt->cr, ((*double)data)[0], ((*double)data)[1], cxt->radius, 0, 2*M_PI);
45 static void draw(GtkWidget *graph, cairo_t *cr) {
46 struct drawing_context cxt;
48 fprintf(stderr, "draw(%d, %d)\n", graph, cr);
49 fprintf(stderr, "allocation.x=%d, allocation.y=%d, allocation.height=%d, allocation.width=%d\n", graph->allocation.x, graph->allocation.y, graph->allocation.height, graph->allocation.width);
51 double x0=graph->allocation.x;
52 double y0=graph->allocation.y;
53 double height=graph->allocation.height;
54 double width=graph->allocation.width;
57 cxt.radius = ((height < width)? height : width)*0.01;
59 fprintf(stderr, "x0=%g, y0=%g, width=%g, height=%g\n", x0, y0, height, width);
60 fprintf(stderr, "move_to(%d, %g->%g, %g->%g)\n", cr, graph_data[0], graph->allocation.x + graph_data[0]*(graph->allocation.width), graph_data[1], graph->allocation.y + graph_data[1]*(graph->allocation.height));
63 cairo_translate(cr, x0, y0);
64 cairo_scale(cr, width, height);
65 g_ptr_array_foreach(GRAPH_WIDGET(graph)->graph->points, &draw_point, (gpointer)&cxt);
66 cairo_set_source_rgb(cr, 0, 0, 0);
71 static gboolean graph_widget_expose(GtkWidget *graph, GdkEventExpose *event) {
72 cairo_t *cr = gdk_cairo_create(graph->window);
73 cairo_rectangle(cr, event->area.x, event->area.y, event->area.width, event->area.height);
80 static void graph_widget_class_init(GraphWidgetClass *klass) {
81 GtkWidgetClass *widget_class;
82 widget_class = GTK_WIDGET_CLASS(klass);
83 widget_class->expose_event = graph_widget_expose;
86 static void graph_widget_init(GraphWidget *graph) {
88 graph->graph = graph_new();
91 GtkWidget *graph_widget_new() {
92 return = g_object_new(GRAPH_WIDGET_TYPE, NULL);
95 Graph* get_graph(GraphWidget* gw) {