1 /* $Id: gtkdatabox_lines.c 4 2008-06-22 09:19:11Z rbock $ */
2 /* GtkDatabox - An extension to the gtk+ library
3 * Copyright (C) 1998 - 2008 Dr. Roland Bock
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public License
7 * as published by the Free Software Foundation; either version 2.1
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 #include <gtkdatabox_lines.h>
21
22 G_DEFINE_TYPE(GtkDataboxLines, gtk_databox_lines,
23 GTK_DATABOX_TYPE_XYC_GRAPH)
24
25 static void gtk_databox_lines_real_draw (GtkDataboxGraph * lines,
26 GtkDatabox* box);
27
28 /**
29 * GtkDataboxLinesPrivate
30 * @see_also: #GtkDatabox, #GtkDataboxGraph, #GtkDataboxPoints, #GtkDataboxBars, #GtkDataboxMarkers
31 *
32 * A private data structure used by the #GtkDataboxLines. It shields all internal things
33 * from developers who are just using the object.
34 *
35 **/
36 typedef struct _GtkDataboxLinesPrivate GtkDataboxLinesPrivate;
37
38 struct _GtkDataboxLinesPrivate
39 {
40 gint16 *xpixels;
41 gint16 *ypixels;
42 guint pixelsalloc;
43 };
44
45 static void
lines_finalize(GObject * object)46 lines_finalize (GObject * object)
47 {
48 GtkDataboxLines *lines = GTK_DATABOX_LINES (object);
49 GtkDataboxLinesPrivate *priv=GTK_DATABOX_LINES_GET_PRIVATE(lines);
50
51 g_free (priv->xpixels);
52 g_free (priv->ypixels);
53
54 /* Chain up to the parent class */
55 G_OBJECT_CLASS (gtk_databox_lines_parent_class)->finalize (object);
56 }
57
58 static void
gtk_databox_lines_class_init(GtkDataboxLinesClass * klass)59 gtk_databox_lines_class_init (GtkDataboxLinesClass *klass)
60 {
61 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
62 GtkDataboxGraphClass *graph_class = GTK_DATABOX_GRAPH_CLASS (klass);
63
64 gobject_class->finalize = lines_finalize;
65
66 graph_class->draw = gtk_databox_lines_real_draw;
67
68 g_type_class_add_private (klass, sizeof (GtkDataboxLinesPrivate));
69 }
70
71 static void
gtk_databox_lines_init(GtkDataboxLines * lines)72 gtk_databox_lines_init (GtkDataboxLines *lines)
73 {
74 GtkDataboxLinesPrivate *priv=GTK_DATABOX_LINES_GET_PRIVATE(lines);
75 priv->xpixels = NULL;
76 priv->ypixels = NULL;
77 priv->pixelsalloc = 0;
78 }
79
80 /**
81 * gtk_databox_lines_new:
82 * @len: length of @X and @Y
83 * @X: array of horizontal position values of markers
84 * @Y: array of vertical position values of markers
85 * @color: color of the markers
86 * @size: marker size or line width (depending on the @type)
87 *
88 * Creates a new #GtkDataboxLines object which can be added to a #GtkDatabox widget.
89 *
90 * Return value: A new #GtkDataboxLines object
91 **/
92 GtkDataboxGraph *
gtk_databox_lines_new(guint len,gfloat * X,gfloat * Y,GdkRGBA * color,guint size)93 gtk_databox_lines_new (guint len, gfloat * X, gfloat * Y,
94 GdkRGBA * color, guint size)
95 {
96 GtkDataboxLines *lines;
97 g_return_val_if_fail (X, NULL);
98 g_return_val_if_fail (Y, NULL);
99 g_return_val_if_fail ((len > 0), NULL);
100
101 lines = g_object_new (GTK_DATABOX_TYPE_LINES,
102 "X-Values", X,
103 "Y-Values", Y,
104 "xstart", 0,
105 "ystart", 0,
106 "xstride", 1,
107 "ystride", 1,
108 "xtype", G_TYPE_FLOAT,
109 "ytype", G_TYPE_FLOAT,
110 "length", len,
111 "maxlen", len,
112 "color", color, "size", size, NULL);
113
114 return GTK_DATABOX_GRAPH (lines);
115 }
116
117 /**
118 * gtk_databox_lines_new_full:
119 * @maxlen: maximum length of @X and @Y
120 * @len: actual number of @X and @Y values to plot
121 * @X: array of horizontal position values of markers
122 * @Y: array of vertical position values of markers
123 * @xstart: the first element in the X array to plot (usually 0)
124 * @ystart: the first element in the Y array to plot (usually 0)
125 * @xstride: successive elements in the X array are separated by this much (1 if array, ncols if matrix)
126 * @ystride: successive elements in the Y array are separated by this much (1 if array, ncols if matrix)
127 * @xtype: the GType of the X array elements. G_TYPE_FLOAT, G_TYPE_DOUBLE, etc.
128 * @ytype: the GType of the Y array elements. G_TYPE_FLOAT, G_TYPE_DOUBLE, etc.
129 * @color: color of the markers
130 * @size: marker size or line width (depending on the @type)
131 *
132 * Creates a new #GtkDataboxLines object which can be added to a #GtkDatabox widget.
133 *
134 * Return value: A new #GtkDataboxLines object
135 **/
136 GtkDataboxGraph *
gtk_databox_lines_new_full(guint maxlen,guint len,void * X,guint xstart,guint xstride,GType xtype,void * Y,guint ystart,guint ystride,GType ytype,GdkRGBA * color,guint size)137 gtk_databox_lines_new_full (guint maxlen, guint len,
138 void * X, guint xstart, guint xstride, GType xtype,
139 void * Y, guint ystart, guint ystride, GType ytype,
140 GdkRGBA * color, guint size)
141 {
142 GtkDataboxLines *lines;
143 g_return_val_if_fail (X, NULL);
144 g_return_val_if_fail (Y, NULL);
145 g_return_val_if_fail ((len > 0), NULL);
146
147 lines = g_object_new (GTK_DATABOX_TYPE_LINES,
148 "X-Values", X,
149 "Y-Values", Y,
150 "xstart", xstart,
151 "ystart", ystart,
152 "xstride", xstride,
153 "ystride", ystride,
154 "xtype", xtype,
155 "ytype", ytype,
156 "length", len,
157 "maxlen", maxlen,
158 "color", color, "size", size, NULL);
159
160 return GTK_DATABOX_GRAPH (lines);
161 }
162
163 static void
gtk_databox_lines_real_draw(GtkDataboxGraph * graph,GtkDatabox * box)164 gtk_databox_lines_real_draw (GtkDataboxGraph * graph,
165 GtkDatabox * box)
166 {
167 GtkDataboxLines *lines = GTK_DATABOX_LINES (graph);
168 GtkDataboxLinesPrivate *priv=GTK_DATABOX_LINES_GET_PRIVATE(graph);
169 guint i = 0;
170 void *X;
171 void *Y;
172 guint len, maxlen;
173 cairo_t *cr;
174 gint16 *xpixels, *ypixels;
175 guint xstart, xstride, ystart, ystride;
176 GType xtype, ytype;
177 float linewidth;
178
179 g_return_if_fail (GTK_DATABOX_IS_LINES (lines));
180 g_return_if_fail (GTK_IS_DATABOX (box));
181
182 len = gtk_databox_xyc_graph_get_length (GTK_DATABOX_XYC_GRAPH (graph));
183 maxlen = gtk_databox_xyc_graph_get_maxlen (GTK_DATABOX_XYC_GRAPH (graph));
184
185 if (priv->pixelsalloc < len)
186 {
187 priv->pixelsalloc = len;
188 priv->xpixels = (gint16 *)g_realloc(priv->xpixels, len * sizeof(gint16));
189 priv->ypixels = (gint16 *)g_realloc(priv->ypixels, len * sizeof(gint16));
190 }
191
192 xpixels = priv->xpixels;
193 ypixels = priv->ypixels;
194
195 X = gtk_databox_xyc_graph_get_X (GTK_DATABOX_XYC_GRAPH (graph));
196 xstart = gtk_databox_xyc_graph_get_xstart (GTK_DATABOX_XYC_GRAPH (graph));
197 xstride = gtk_databox_xyc_graph_get_xstride (GTK_DATABOX_XYC_GRAPH (graph));
198 xtype = gtk_databox_xyc_graph_get_xtype (GTK_DATABOX_XYC_GRAPH (graph));
199 gtk_databox_values_to_xpixels(box, xpixels, X, xtype, maxlen, xstart, xstride, len);
200
201 Y = gtk_databox_xyc_graph_get_Y (GTK_DATABOX_XYC_GRAPH (graph));
202 ystart = gtk_databox_xyc_graph_get_ystart (GTK_DATABOX_XYC_GRAPH (graph));
203 ystride = gtk_databox_xyc_graph_get_ystride (GTK_DATABOX_XYC_GRAPH (graph));
204 ytype = gtk_databox_xyc_graph_get_ytype (GTK_DATABOX_XYC_GRAPH (graph));
205 gtk_databox_values_to_ypixels(box, ypixels, Y, ytype, maxlen, ystart, ystride, len);
206
207 cr = gtk_databox_graph_create_gc (graph, box);
208
209 linewidth = gtk_databox_graph_get_size (graph);
210 cairo_set_line_width(cr, linewidth + 0.1);
211
212 cairo_move_to(cr, xpixels[0] + 0.5, ypixels[0] + 0.5);
213 for (i = 1; i < len; i++)
214 cairo_line_to(cr, xpixels[i] + 0.5, ypixels[i] + 0.5);
215
216 cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
217 cairo_stroke(cr);
218 cairo_destroy(cr);
219
220 return;
221 }
222