src/graph.c

   1 /*
   2  * Copyright (C) 2010-2014 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 <string.h>
  21
  22 #include <sys/time.h>
  23
  24 #include <glib/gi18n.h>
  25 #include <gtk/gtk.h>
  26
  27 #include <cfg.h>
  28 #include <plog.h>
  29 #include <psensor.h>
  30
  31 /* horizontal padding */
  32 #define GRAPH_H_PADDING 4
  33 /* vertical padding */
  34 #define GRAPH_V_PADDING 4
  35
  36 static time_t get_graph_end_time_s()
  37 {
  38         struct timeval tv;
  39
  40         if (gettimeofday(&tv, NULL) == 0)
  41                 return tv.tv_sec;
  42         else
  43                 return 0;
  44 }
  45
  46 static time_t get_graph_begin_time_s(struct config *cfg)
  47 {
  48         int ct;
  49
  50         ct = get_graph_end_time_s();
  51
  52         if (!ct)
  53                 return 0;
  54
  55         return ct - cfg->graph_monitoring_duration * 60;
  56 }
  57
  58 static double
  59 compute_y(double value, double min, double max, int height, int off)
  60 {
  61         double t = value - min;
  62         return height - ((double)height * (t / (max - min))) + off;
  63 }
  64
  65 static char *time_to_str(time_t s)
  66 {
  67         char *str;
  68         /* note: localtime returns a static field, no free required */
  69         struct tm *tm = localtime(&s);
  70
  71         if (!tm)
  72                 return NULL;
  73
  74         str = malloc(6);
  75         strftime(str, 6, "%H:%M", tm);
  76
  77         return str;
  78 }
  79
  80 static void
  81 draw_graph_background(cairo_t *cr,
  82                       int g_xoff, int g_yoff,
  83                       int g_width, int g_height,
  84                       int width, int height, struct config *config,
  85                       GtkWidget *widget,
  86                       GtkWidget *window)
  87 {
  88         GtkStyleContext *style_ctx;
  89         struct color *bgcolor;
  90         GdkRGBA rgba;
  91
  92         bgcolor = config->graph_bgcolor;
  93
  94         style_ctx = gtk_widget_get_style_context(window);
  95         gtk_style_context_get_background_color(style_ctx,
  96                                                GTK_STATE_FLAG_NORMAL,
  97                                                &rgba);
  98
  99         if (config->alpha_channel_enabled)
 100                 cairo_set_source_rgba(cr,
 101                                       rgba.red,
 102                                       rgba.green,
 103                                       rgba.blue,
 104                                       config->graph_bg_alpha);
 105         else
 106                 cairo_set_source_rgb(cr,
 107                                      rgba.red,
 108                                      rgba.green,
 109                                      rgba.blue);
 110
 111         cairo_rectangle(cr, 0, 0, width, height);
 112         cairo_fill(cr);
 113         if (config->alpha_channel_enabled)
 114                 cairo_set_source_rgba(cr,
 115                                       bgcolor->red,
 116                                       bgcolor->green,
 117                                       bgcolor->blue,
 118                                       config->graph_bg_alpha);
 119         else
 120                 cairo_set_source_rgb(cr,
 121                                      bgcolor->red,
 122                                      bgcolor->green,
 123                                      bgcolor->blue);
 124
 125         cairo_rectangle(cr, g_xoff, g_yoff, g_width, g_height);
 126         cairo_fill(cr);
 127 }
 128
 129 /* setup dash style */
 130 static double dashes[] = {
 131         1.0,            /* ink */
 132         2.0,            /* skip */
 133 };
 134 static int ndash = sizeof(dashes) / sizeof(dashes[0]);
 135
 136 static void draw_background_lines(cairo_t *cr,
 137                                   struct color *color,
 138                                   int g_width, int g_height,
 139                                   int g_xoff, int g_yoff,
 140                                   int min, int max)
 141 {
 142         int i;
 143
 144         /* draw background lines */
 145         cairo_set_line_width(cr, 1);
 146         cairo_set_dash(cr, dashes, ndash, 0);
 147         cairo_set_source_rgb(cr,
 148                              color->red, color->green, color->blue);
 149
 150         /* vertical lines representing time steps */
 151         for (i = 0; i <= 5; i++) {
 152                 int x = i * (g_width / 5) + g_xoff;
 153                 cairo_move_to(cr, x, g_yoff);
 154                 cairo_line_to(cr, x, g_yoff + g_height);
 155                 cairo_stroke(cr);
 156         }
 157
 158         /* horizontal lines draws a line for each 10C step */
 159         for (i = min; i < max; i++) {
 160                 if (i % 10 == 0) {
 161                         int y = compute_y(i, min, max, g_height, g_yoff);
 162
 163                         cairo_move_to(cr, g_xoff, y);
 164                         cairo_line_to(cr, g_xoff + g_width, y);
 165                         cairo_stroke(cr);
 166                 }
 167         }
 168
 169         /* back to normal line style */
 170         cairo_set_dash(cr, 0, 0, 0);
 171 }
 172
 173 /* Keys: sensor identifier.
 174  *
 175  * Values: array of time_t. Each time_t is corresponding to a sensor
 176  * measure which has been used as the start point of a Bezier curve.
 177  */
 178 static GHashTable *times;
 179
 180 static void draw_sensor_smooth_curve(struct psensor *s,
 181                                      cairo_t *cr,
 182                                      double min,
 183                                      double max,
 184                                      int bt,
 185                                      int et,
 186                                      int g_width,
 187                                      int g_height,
 188                                      int g_xoff,
 189                                      int g_yoff)
 190 {
 191         int i, dt, vdt, j, k, found;
 192         double x[4], y[4], v;
 193         time_t t, t0, *stimes;
 194
 195         if (!times)
 196                 times = g_hash_table_new_full(g_str_hash,
 197                                               g_str_equal,
 198                                               free,
 199                                               free);
 200
 201         stimes = g_hash_table_lookup(times, s->id);
 202
 203         cairo_set_source_rgb(cr,
 204                              s->color->red,
 205                              s->color->green,
 206                              s->color->blue);
 207
 208         /* search the index of the first measure used as a start point
 209          * of a Bezier curve. The start and end points of the Bezier
 210          * curves must be preserved to ensure the same overall shape
 211          * of the graph. */
 212         i = 0;
 213         if (stimes) {
 214                 while (i < s->values_max_length) {
 215                         t = s->measures[i].time.tv_sec;
 216                         v = s->measures[i].value;
 217
 218                         found = 0;
 219                         if (v != UNKNOWN_DBL_VALUE && t) {
 220                                 k = 0;
 221                                 while (stimes[k]) {
 222                                         if (t == stimes[k]) {
 223                                                 found = 1;
 224                                                 break;
 225                                         }
 226                                         k++;
 227                                 }
 228                         }
 229
 230                         if (found)
 231                                 break;
 232
 233                         i++;
 234                 }
 235         }
 236
 237         stimes = malloc((s->values_max_length + 1) * sizeof(time_t));
 238         memset(stimes, 0, (s->values_max_length + 1) * sizeof(time_t));
 239         g_hash_table_insert(times, strdup(s->id), stimes);
 240
 241         if (i == s->values_max_length)
 242                 i = 0;
 243
 244         k = 0;
 245         dt = et - bt;
 246         while (i < s->values_max_length) {
 247                 j = 0;
 248                 t = 0;
 249                 while (i < s->values_max_length && j < 4) {
 250                         t = s->measures[i].time.tv_sec;
 251                         v = s->measures[i].value;
 252
 253                         if (v == UNKNOWN_DBL_VALUE || !t) {
 254                                 i++;
 255                                 continue;
 256                         }
 257
 258                         vdt = t - bt;
 259
 260                         x[0 + j] = ((double)vdt * g_width) / dt + g_xoff;
 261                         y[0 + j] = compute_y(v, min, max, g_height, g_yoff);
 262
 263                         if (j == 0)
 264                                 t0 = t;
 265
 266                         i++;
 267                         j++;
 268                 }
 269
 270                 if (j == 4) {
 271                         cairo_move_to(cr, x[0], y[0]);
 272                         cairo_curve_to(cr, x[1], y[1], x[2], y[3], x[3], y[3]);
 273                         stimes[k++] = t0;
 274                         i--;
 275                 }
 276         }
 277
 278         cairo_stroke(cr);
 279 }
 280
 281 static void draw_sensor_curve(struct psensor *s,
 282                               cairo_t *cr,
 283                               double min,
 284                               double max,
 285                               int bt,
 286                               int et,
 287                               int g_width,
 288                               int g_height,
 289                               int g_xoff,
 290                               int g_yoff)
 291 {
 292         int first, i, t, dt, vdt;
 293         double v, x, y;
 294
 295         cairo_set_source_rgb(cr,
 296                              s->color->red,
 297                              s->color->green,
 298                              s->color->blue);
 299
 300         dt = et - bt;
 301         first = 1;
 302         for (i = 0; i < s->values_max_length; i++) {
 303                 t = s->measures[i].time.tv_sec;
 304                 v = s->measures[i].value;
 305
 306                 if (v == UNKNOWN_DBL_VALUE || !t)
 307                         continue;
 308
 309                 vdt = t - bt;
 310                 if (vdt < 0)
 311                         continue;
 312
 313                 x = ((double)vdt * g_width) / dt + g_xoff;
 314
 315                 y = compute_y(v, min, max, g_height, g_yoff);
 316
 317                 if (first) {
 318                         cairo_move_to(cr, x, y);
 319                         first = 0;
 320                 } else {
 321                         cairo_line_to(cr, x, y);
 322                 }
 323
 324         }
 325         cairo_stroke(cr);
 326 }
 327
 328 static void display_no_graphs_warning(cairo_t *cr, int x, int y)
 329 {
 330         char *msg;
 331
 332         msg = strdup(_("No graphs enabled"));
 333
 334         cairo_select_font_face(cr,
 335                                "sans-serif",
 336                                CAIRO_FONT_SLANT_NORMAL,
 337                                CAIRO_FONT_WEIGHT_NORMAL);
 338         cairo_set_font_size(cr, 18.0);
 339
 340         cairo_move_to(cr, x, y);
 341         cairo_show_text(cr, msg);
 342
 343         free(msg);
 344 }
 345
 346 void
 347 graph_update(struct psensor **sensors,
 348              GtkWidget *w_graph,
 349              struct config *config,
 350              GtkWidget *window)
 351 {
 352         struct color *fgcolor = config->graph_fgcolor;
 353         int et, bt, width, height, g_width, g_height;
 354         double min_rpm, max_rpm, mint, maxt;
 355         char *strmin, *strmax;
 356         /* horizontal and vertical offset of the graph */
 357         int g_xoff, g_yoff, no_graphs, min, max;
 358         cairo_surface_t *cst;
 359         cairo_t *cr, *cr_pixmap;
 360         char *str_btime, *str_etime;
 361         cairo_text_extents_t te_btime, te_etime, te_max, te_min;
 362         struct psensor **sensor_cur, **enabled_sensors;
 363         GtkAllocation galloc;
 364         GtkStyleContext *style_ctx;
 365         GdkRGBA rgba;
 366
 367         if (!gtk_widget_is_drawable(w_graph))
 368                 return ;
 369
 370         enabled_sensors = psensor_list_filter_graph_enabled(sensors);
 371
 372         min_rpm = get_min_rpm(enabled_sensors);
 373         max_rpm = get_max_rpm(enabled_sensors);
 374
 375         mint = get_min_temp(enabled_sensors);
 376         strmin = psensor_value_to_str(SENSOR_TYPE_TEMP,
 377                                       mint,
 378                                       config->temperature_unit == CELSIUS);
 379
 380         maxt = get_max_temp(enabled_sensors);
 381         strmax = psensor_value_to_str(SENSOR_TYPE_TEMP,
 382                                       maxt,
 383                                       config->temperature_unit == CELSIUS);
 384
 385         str_btime = time_to_str(get_graph_begin_time_s(config));
 386         str_etime = time_to_str(get_graph_end_time_s());
 387
 388         gtk_widget_get_allocation(w_graph, &galloc);
 389         width = galloc.width;
 390         height = galloc.height;
 391
 392         cst = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 393         cr = cairo_create(cst);
 394
 395         cairo_select_font_face(cr,
 396                                "sans-serif",
 397                                CAIRO_FONT_SLANT_NORMAL,
 398                                CAIRO_FONT_WEIGHT_NORMAL);
 399         cairo_set_font_size(cr, 10.0);
 400
 401         cairo_text_extents(cr, str_etime, &te_etime);
 402         cairo_text_extents(cr, str_btime, &te_btime);
 403         cairo_text_extents(cr, strmax, &te_max);
 404         cairo_text_extents(cr, strmin, &te_min);
 405
 406         g_yoff = GRAPH_V_PADDING;
 407
 408         g_height = height - GRAPH_V_PADDING;
 409         if (te_etime.height > te_btime.height)
 410                 g_height -= GRAPH_V_PADDING + te_etime.height + GRAPH_V_PADDING;
 411         else
 412                 g_height -= GRAPH_V_PADDING + te_btime.height + GRAPH_V_PADDING;
 413
 414         if (te_min.width > te_max.width)
 415                 g_xoff = (2 * GRAPH_H_PADDING) + te_max.width;
 416         else
 417                 g_xoff = (2 * GRAPH_H_PADDING) + te_min.width;
 418
 419         g_width = width - g_xoff - GRAPH_H_PADDING;
 420
 421         draw_graph_background(cr,
 422                               g_xoff, g_yoff, g_width, g_height,
 423                               width, height, config,
 424                               w_graph,
 425                               window);
 426
 427         /** Set the color for text drawing */
 428         style_ctx = gtk_widget_get_style_context(window);
 429         gtk_style_context_get_color(style_ctx, GTK_STATE_FLAG_NORMAL, &rgba);
 430         cairo_set_source_rgb(cr, rgba.red, rgba.green, rgba.blue);
 431
 432         /* draw graph begin time */
 433         cairo_move_to(cr, g_xoff, height - GRAPH_V_PADDING);
 434         cairo_show_text(cr, str_btime);
 435         free(str_btime);
 436
 437         /* draw graph end time */
 438         cairo_move_to(cr,
 439                       width - te_etime.width - GRAPH_H_PADDING,
 440                       height - GRAPH_V_PADDING);
 441         cairo_show_text(cr, str_etime);
 442         free(str_etime);
 443
 444         /* draw min and max temp */
 445         cairo_move_to(cr, GRAPH_H_PADDING, te_max.height + GRAPH_V_PADDING);
 446         cairo_show_text(cr, strmax);
 447         free(strmax);
 448
 449         cairo_move_to(cr,
 450                       GRAPH_H_PADDING, height - (te_min.height / 2) - g_yoff);
 451         cairo_show_text(cr, strmin);
 452         free(strmin);
 453
 454         draw_background_lines(cr, fgcolor,
 455                               g_width, g_height,
 456                               g_xoff, g_yoff,
 457                               mint, maxt);
 458
 459         /* .. and finaly draws the temperature graphs */
 460         bt = get_graph_begin_time_s(config);
 461         et = get_graph_end_time_s();
 462
 463         if (bt && et) {
 464                 sensor_cur = enabled_sensors;
 465
 466                 cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
 467                 cairo_set_line_width(cr, 1);
 468                 no_graphs = 1;
 469                 while (*sensor_cur) {
 470                         struct psensor *s = *sensor_cur;
 471
 472                         no_graphs = 0;
 473                         if (s->type & SENSOR_TYPE_RPM) {
 474                                 min = min_rpm;
 475                                 max = max_rpm;
 476                         } else if (s->type & SENSOR_TYPE_PERCENT) {
 477                                 min = 0;
 478                                 max = get_max_value(enabled_sensors,
 479                                                     SENSOR_TYPE_PERCENT);
 480                         } else {
 481                                 min = mint;
 482                                 max = maxt;
 483                         }
 484
 485                         if (1)
 486                                 draw_sensor_smooth_curve(s, cr,
 487                                                          min, max,
 488                                                          bt, et,
 489                                                          g_width, g_height,
 490                                                          g_xoff, g_yoff);
 491                         else
 492                                 draw_sensor_curve(s, cr,
 493                                                   min, max,
 494                                                   bt, et,
 495                                                   g_width, g_height,
 496                                                   g_xoff, g_yoff);
 497
 498                         sensor_cur++;
 499                 }
 500
 501                 if (no_graphs)
 502                         display_no_graphs_warning(cr,
 503                                                   g_xoff + 12,
 504                                                   g_height / 2);
 505         }
 506
 507         cr_pixmap = gdk_cairo_create(gtk_widget_get_window(w_graph));
 508
 509         if (cr_pixmap) {
 510                 if (config->alpha_channel_enabled)
 511                         cairo_set_operator(cr_pixmap, CAIRO_OPERATOR_SOURCE);
 512
 513                 cairo_set_source_surface(cr_pixmap, cst, 0, 0);
 514                 cairo_paint(cr_pixmap);
 515         }
 516
 517         free(enabled_sensors);
 518
 519         cairo_destroy(cr_pixmap);
 520         cairo_surface_destroy(cst);
 521         cairo_destroy(cr);
 522 }