src/graph.c

   1 /*
   2  * Copyright (C) 2010-2012 jeanfi@gmail.com
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301 USA
  18  */
  19 #include <stdlib.h>
  20 #include <sys/time.h>
  21 #include <gtk/gtk.h>
  22
  23 #include "cfg.h"
  24 #include "psensor.h"
  25
  26 /* horizontal padding */
  27 #define GRAPH_H_PADDING 4
  28 /* vertical padding */
  29 #define GRAPH_V_PADDING 4
  30
  31 static time_t get_graph_end_time_s()
  32 {
  33         struct timeval tv;
  34
  35         if (gettimeofday(&tv, NULL) == 0)
  36                 return tv.tv_sec;
  37         else
  38                 return 0;
  39 }
  40
  41 static time_t get_graph_begin_time_s(struct config *cfg)
  42 {
  43         int ct;
  44
  45         ct = get_graph_end_time_s();
  46
  47         if (!ct)
  48                 return 0;
  49
  50         return ct - cfg->graph_monitoring_duration * 60;
  51 }
  52
  53 static int compute_y(double value, double min, double max, int height, int off)
  54 {
  55         double t = value - min;
  56         return height - ((double)height * (t / (max - min))) + off;
  57 }
  58
  59 static char *time_to_str(time_t s)
  60 {
  61         char *str;
  62         /* note: localtime returns a static field, no free required */
  63         struct tm *tm = localtime(&s);
  64
  65         if (!tm)
  66                 return NULL;
  67
  68         str = malloc(6);
  69         strftime(str, 6, "%H:%M", tm);
  70
  71         return str;
  72 }
  73
  74 static void
  75 draw_graph_background(cairo_t *cr,
  76                       int g_xoff, int g_yoff,
  77                       int g_width, int g_height,
  78                       int width, int height, struct config *config,
  79                       GtkWidget *widget)
  80 {
  81         GtkStyle *style;
  82         struct color *bgcolor = config->graph_bgcolor;
  83         GdkColor *bg;
  84
  85         style = gtk_widget_get_style(widget);
  86
  87         bg = &style->bg[GTK_STATE_NORMAL];
  88
  89         if (config->alpha_channel_enabled)
  90                 cairo_set_source_rgba(cr,
  91                                       ((double)bg->red) / 65535,
  92                                       ((double)bg->green) / 65535,
  93                                       ((double)bg->blue) / 65535,
  94                                       config->graph_bg_alpha);
  95         else
  96                 cairo_set_source_rgb(cr,
  97                                      ((double)bg->red) / 65535,
  98                                      ((double)bg->green) / 65535,
  99                                      ((double)bg->blue) / 65535);
 100
 101         cairo_rectangle(cr, 0, 0, width, height);
 102         cairo_fill(cr);
 103         if (config->alpha_channel_enabled)
 104                 cairo_set_source_rgba(cr,
 105                                       bgcolor->f_red,
 106                                       bgcolor->f_green,
 107                                       bgcolor->f_blue, config->graph_bg_alpha);
 108         else
 109                 cairo_set_source_rgb(cr,
 110                                      bgcolor->f_red,
 111                                      bgcolor->f_green, bgcolor->f_blue);
 112
 113
 114
 115         cairo_rectangle(cr, g_xoff, g_yoff, g_width, g_height);
 116         cairo_fill(cr);
 117 }
 118
 119 /* setup dash style */
 120 static double dashes[] = {
 121         1.0,            /* ink */
 122         2.0,            /* skip */
 123 };
 124 static int ndash = sizeof(dashes) / sizeof(dashes[0]);
 125
 126 static void draw_background_lines(cairo_t *cr,
 127                                   struct color *color,
 128                                   int g_width, int g_height,
 129                                   int g_xoff, int g_yoff,
 130                                   int min, int max)
 131 {
 132         int i;
 133
 134         /* draw background lines */
 135         cairo_set_line_width(cr, 1);
 136         cairo_set_dash(cr, dashes, ndash, 0);
 137         cairo_set_source_rgb(cr,
 138                              color->f_red, color->f_green, color->f_blue);
 139
 140         /* vertical lines representing time steps */
 141         for (i = 0; i <= 5; i++) {
 142                 int x = i * (g_width / 5) + g_xoff;
 143                 cairo_move_to(cr, x, g_yoff);
 144                 cairo_line_to(cr, x, g_yoff + g_height);
 145                 cairo_stroke(cr);
 146         }
 147
 148         /* horizontal lines draws a line for each 10C step */
 149         for (i = min; i < max; i++) {
 150                 if (i % 10 == 0) {
 151                         int y = compute_y(i, min, max, g_height, g_yoff);
 152
 153                         cairo_move_to(cr, g_xoff, y);
 154                         cairo_line_to(cr, g_xoff + g_width, y);
 155                         cairo_stroke(cr);
 156                 }
 157         }
 158
 159         /* back to normal line style */
 160         cairo_set_dash(cr, 0, 0, 0);
 161 }
 162
 163 static void draw_sensor_curve(struct psensor *s,
 164                               cairo_t *cr,
 165                               double min,
 166                               double max,
 167                               int bt,
 168                               int et,
 169                               int g_width,
 170                               int g_height,
 171                               int g_xoff,
 172                               int g_yoff)
 173 {
 174         int first = 1;
 175         int i;
 176
 177         cairo_set_source_rgb(cr,
 178                              s->color->f_red,
 179                              s->color->f_green,
 180                              s->color->f_blue);
 181
 182         for (i = 0; i < s->values_max_length; i++) {
 183                 int x, y, t;
 184                 double v;
 185
 186                 t = s->measures[i].time.tv_sec;
 187                 v = s->measures[i].value.d_num;
 188
 189                 if (v == UNKNOWN_DBL_VALUE || !t || (t - bt) < 0)
 190                         continue;
 191
 192                 x = (t - bt) * g_width / (et - bt) + g_xoff;
 193
 194                 y = compute_y(v, min, max, g_height, g_yoff);
 195
 196                 if (first) {
 197                         cairo_move_to(cr, x, y);
 198                         first = 0;
 199                 } else {
 200                         cairo_line_to(cr, x, y);
 201                 }
 202
 203         }
 204         cairo_stroke(cr);
 205 }
 206
 207
 208 void
 209 graph_update(struct psensor **sensors,
 210              GtkWidget *w_graph,
 211              struct config *config)
 212 {
 213         struct color *fgcolor = config->graph_fgcolor;
 214         int et, bt, width, height, g_width, g_height;
 215         double min_rpm, max_rpm, mint, maxt;
 216         char *strmin, *strmax;
 217         /* horizontal and vertical offset of the graph */
 218         int g_xoff, g_yoff;
 219         cairo_surface_t *cst;
 220         cairo_t *cr, *cr_pixmap;
 221         char *str_btime, *str_etime;
 222         cairo_text_extents_t te_btime, te_etime, te_max, te_min;
 223         struct psensor **sensor_cur;
 224         GtkAllocation galloc;
 225
 226         if (!gtk_widget_is_drawable(w_graph))
 227                 return ;
 228
 229         min_rpm = get_min_rpm(sensors);
 230         max_rpm = get_max_rpm(sensors);
 231
 232         mint = get_min_temp(sensors);
 233         strmin = psensor_value_to_string(SENSOR_TYPE_TEMP, mint);
 234
 235         maxt = get_max_temp(sensors);
 236         strmax = psensor_value_to_string(SENSOR_TYPE_TEMP, maxt);
 237
 238         str_btime = time_to_str(get_graph_begin_time_s(config));
 239         str_etime = time_to_str(get_graph_end_time_s());
 240
 241         gtk_widget_get_allocation(w_graph, &galloc);
 242         width = galloc.width;
 243         height = galloc.height;
 244
 245         cst = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 246         cr = cairo_create(cst);
 247
 248         cairo_select_font_face(cr,
 249                                "sans-serif",
 250                                CAIRO_FONT_SLANT_NORMAL,
 251                                CAIRO_FONT_WEIGHT_NORMAL);
 252         cairo_set_font_size(cr, 10.0);
 253
 254         cairo_text_extents(cr, str_etime, &te_etime);
 255         cairo_text_extents(cr, str_btime, &te_btime);
 256         cairo_text_extents(cr, strmax, &te_max);
 257         cairo_text_extents(cr, strmin, &te_min);
 258
 259         g_yoff = GRAPH_V_PADDING;
 260
 261         g_height = height - GRAPH_V_PADDING;
 262         if (te_etime.height > te_btime.height)
 263                 g_height -= GRAPH_V_PADDING + te_etime.height + GRAPH_V_PADDING;
 264         else
 265                 g_height -= GRAPH_V_PADDING + te_btime.height + GRAPH_V_PADDING;
 266
 267         if (te_min.width > te_max.width)
 268                 g_xoff = (2 * GRAPH_H_PADDING) + te_max.width;
 269         else
 270                 g_xoff = (2 * GRAPH_H_PADDING) + te_min.width;
 271
 272         g_width = width - g_xoff - GRAPH_H_PADDING;
 273
 274         draw_graph_background(cr,
 275                               g_xoff, g_yoff, g_width, g_height,
 276                               width, height, config,
 277                               w_graph);
 278
 279         cairo_set_source_rgb(cr,
 280                              fgcolor->f_red, fgcolor->f_green, fgcolor->f_blue);
 281
 282         /* draw graph begin time */
 283         cairo_move_to(cr, g_xoff, height - GRAPH_V_PADDING);
 284         cairo_show_text(cr, str_btime);
 285         free(str_btime);
 286
 287         /* draw graph end time */
 288         cairo_move_to(cr,
 289                       width - te_etime.width - GRAPH_H_PADDING,
 290                       height - GRAPH_V_PADDING);
 291         cairo_show_text(cr, str_etime);
 292         free(str_etime);
 293
 294         /* draw min and max temp */
 295         cairo_move_to(cr, GRAPH_H_PADDING, te_max.height + GRAPH_V_PADDING);
 296         cairo_show_text(cr, strmax);
 297         free(strmax);
 298
 299         cairo_move_to(cr,
 300                       GRAPH_H_PADDING, height - (te_min.height / 2) - g_yoff);
 301         cairo_show_text(cr, strmin);
 302         free(strmin);
 303
 304         draw_background_lines(cr, fgcolor,
 305                               g_width, g_height,
 306                               g_xoff, g_yoff,
 307                               mint, maxt);
 308
 309         /* .. and finaly draws the temperature graphs */
 310         bt = get_graph_begin_time_s(config);
 311         et = get_graph_end_time_s();
 312
 313         if (bt && et) {
 314                 sensor_cur = sensors;
 315
 316                 cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
 317                 cairo_set_line_width(cr, 1);
 318
 319                 while (*sensor_cur) {
 320                         struct psensor *s = *sensor_cur;
 321
 322                         if (s->enabled) {
 323                                 double min, max;
 324
 325                                 if (is_fan_type(s->type)) {
 326                                         min = min_rpm;
 327                                         max = max_rpm;
 328                                 } else if (s->type & SENSOR_TYPE_CPU_USAGE) {
 329                                         min = 0;
 330                                         max = get_max_value
 331                                                 (sensors,
 332                                                  SENSOR_TYPE_CPU_USAGE);
 333                                 } else {
 334                                         min = mint;
 335                                         max = maxt;
 336                                 }
 337
 338                                 draw_sensor_curve(s, cr,
 339                                                   min, max,
 340                                                   bt, et,
 341                                                   g_width, g_height,
 342                                                   g_xoff, g_yoff);
 343                         }
 344
 345                         sensor_cur++;
 346                 }
 347         }
 348
 349         cr_pixmap = gdk_cairo_create(gtk_widget_get_window(w_graph));
 350
 351         if (cr_pixmap) {
 352
 353                 if (config->alpha_channel_enabled)
 354                         cairo_set_operator(cr_pixmap, CAIRO_OPERATOR_SOURCE);
 355
 356                 cairo_set_source_surface(cr_pixmap, cst, 0, 0);
 357                 cairo_paint(cr_pixmap);
 358         }
 359
 360         cairo_destroy(cr_pixmap);
 361         cairo_surface_destroy(cst);
 362         cairo_destroy(cr);
 363 }