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Member "g3data-1.5.4/g3data/drawing.c" (8 Jan 2011, 4694 Bytes) of package /linux/privat/old/g3data-1.5.4.tar.gz:
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1 /*
2
3 g3data : A program for grabbing data from scanned graphs
4 Copyright (C) 2000 Jonas Frantz
5
6 This file is part of g3data.
7
8 g3data is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 g3data is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21
22
23 Authors email : jonas.frantz@welho.com
24
25 */
26
27 #include <stdlib.h>
28 #include <gtk/gtk.h>
29 #include "main.h"
30 #include "drawing.h"
31
32 #define MARKERLENGTH 6 /* Axis marker length */
33 #define MARKERTHICKNESS 2 /* Axis marker thickness */
34
35 /****************************************************************/
36 /* This function draws the X-axis, Y-axis or point marker on */
37 /* the drawing_area depending on the value of the type */
38 /* parameter. */
39 /****************************************************************/
40 void DrawMarker(cairo_t *cr, gint x, gint y, gint type, GdkColor *color)
41 {
42 if (type == 0) {
43 gdk_cairo_set_source_color(cr, &color[0]);
44 cairo_move_to(cr, x - MARKERLENGTH, y);
45 cairo_rel_line_to(cr, 2 * MARKERLENGTH, 0);
46 cairo_move_to(cr, x, y);
47 cairo_rel_line_to(cr, 0, -MARKERLENGTH);
48 cairo_stroke(cr);
49 } else if (type == 1) {
50 gdk_cairo_set_source_color(cr, &color[1]);
51 cairo_move_to(cr, x, y - MARKERLENGTH);
52 cairo_rel_line_to(cr, 0, 2 * MARKERLENGTH);
53 cairo_move_to(cr, x, y);
54 cairo_rel_line_to(cr, MARKERLENGTH, 0);
55 cairo_stroke(cr);
56 } else if (type == 2) {
57 gdk_cairo_set_source_color(cr, &color[2]);
58 cairo_rectangle(cr, x - MARKERLENGTH / 2, y - MARKERLENGTH / 2, MARKERLENGTH, MARKERLENGTH);
59 cairo_stroke(cr);
60 }
61 }
62
63
64 /****************************************************************/
65 /* This function initializes the colors which are used when */
66 /* drawing the axispoints and the graph points */
67 /****************************************************************/
68 gboolean setcolors(GdkColor **color)
69 {
70 gboolean *success;
71 gint i, ncolors;
72 gushort xcolor[19][4] = {{40000,20000,48000}, /* x axis marker color */
73 {40000,48000,20000}, /* y axis marker color */
74 {65535,00000,00000}, /* outer square color */
75 {65535,65535,65535}}; /* inner square color */
76
77 ncolors=4; /* Number of colors to be initialized */
78 *color = (GdkColor *) calloc (ncolors, sizeof(GdkColor)); /* Allocate memory for the colors */
79 success = (gboolean *) calloc (ncolors, sizeof(gboolean));
80
81 for(i=0;i<ncolors;i++) { /* Transfer colorindexes into colors array */
82 (*color)[i].red = xcolor[i][0];
83 (*color)[i].green = xcolor[i][1];
84 (*color)[i].blue = xcolor[i][2];
85 }
86
87 /* Allocate the colors */
88 gdk_colormap_alloc_colors(gdk_colormap_get_system(),*color, ncolors, FALSE, FALSE, success);
89 free(success);
90
91 return TRUE;
92 }