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 <math.h>
  28
  29 #include <cfg.h>
  30 #include <plog.h>
  31 #include <psensor.h>
  32
  33 /* horizontal padding */
  34 #define GRAPH_H_PADDING 4
  35 /* vertical padding */
  36 #define GRAPH_V_PADDING 4
  37
  38 bool is_smooth_curves_enabled;
  39
  40 struct graph_info {
  41         /* Horizontal position of the central region (curves) */
  42         int g_xoff;
  43         /* Vertical position of the central region (curves) */
  44         int g_yoff;
  45
  46         /* Height of the drawing canvas */
  47         int height;
  48
  49         /* Background color of the current desktop theme */
  50         GdkRGBA theme_bg_color;
  51         /* Foreground color of the current desktop theme */
  52         GdkRGBA theme_fg_color;
  53 };
  54
  55
  56 /* Return the end time of the graph i.e. the more recent measure.  If
  57  * no measure are available, return 0.
  58  */
  59 static time_t get_graph_end_time_s(struct psensor **sensors)
  60 {
  61         time_t ret, t;
  62         struct psensor *s;
  63         struct measure *measures;
  64         int i;
  65
  66         ret = 0;
  67         while (*sensors) {
  68                 s = *sensors;
  69                 measures = s->measures;
  70
  71                 for (i = s->values_max_length - 1; i >= 0; i--) {
  72                         if (measures[i].value != UNKNOWN_DBL_VALUE) {
  73                                 t = measures[i].time.tv_sec;
  74
  75                                 if (t > ret)
  76                                         ret = t;
  77                         }
  78                         i--;
  79                 }
  80
  81                 sensors++;
  82         }
  83
  84         return ret;
  85 }
  86
  87 static time_t get_graph_begin_time_s(struct config *cfg, time_t etime)
  88 {
  89         if (!etime)
  90                 return 0;
  91
  92         return etime - cfg->graph_monitoring_duration * 60;
  93 }
  94
  95 static double
  96 compute_y(double value, double min, double max, int height, int off)
  97 {
  98         double t = value - min;
  99
 100         return height - ((double)height * (t / (max - min))) + off;
 101 }
 102
 103 static char *time_to_str(time_t s)
 104 {
 105         char *str;
 106         /* note: localtime returns a static field, no free required */
 107         struct tm *tm = localtime(&s);
 108
 109         if (!tm)
 110                 return NULL;
 111
 112         str = malloc(6);
 113         strftime(str, 6, "%H:%M", tm);
 114
 115         return str;
 116 }
 117
 118 static void draw_left_region(cairo_t *cr, struct graph_info *info)
 119 {
 120         cairo_set_source_rgb(cr,
 121                              info->theme_bg_color.red,
 122                              info->theme_bg_color.green,
 123                              info->theme_bg_color.blue);
 124
 125         cairo_rectangle(cr, 0, 0, info->g_xoff, info->height);
 126         cairo_fill(cr);
 127 }
 128
 129 static void
 130 draw_graph_background(cairo_t *cr,
 131                       int g_xoff, int g_yoff,
 132                       int g_width, int g_height,
 133                       int width, struct config *config,
 134                       struct graph_info *info)
 135 {
 136         struct color *bgcolor;
 137
 138         bgcolor = config->graph_bgcolor;
 139
 140         if (config->alpha_channel_enabled)
 141                 cairo_set_source_rgba(cr,
 142                                       info->theme_bg_color.red,
 143                                       info->theme_bg_color.green,
 144                                       info->theme_bg_color.blue,
 145                                       config->graph_bg_alpha);
 146         else
 147                 cairo_set_source_rgb(cr,
 148                                      info->theme_bg_color.red,
 149                                      info->theme_bg_color.green,
 150                                      info->theme_bg_color.blue);
 151
 152         cairo_rectangle(cr, g_xoff, 0, g_width, info->height);
 153         cairo_fill(cr);
 154
 155         if (config->alpha_channel_enabled)
 156                 cairo_set_source_rgba(cr,
 157                                       bgcolor->red,
 158                                       bgcolor->green,
 159                                       bgcolor->blue,
 160                                       config->graph_bg_alpha);
 161         else
 162                 cairo_set_source_rgb(cr,
 163                                      bgcolor->red,
 164                                      bgcolor->green,
 165                                      bgcolor->blue);
 166
 167         cairo_rectangle(cr, g_xoff, g_yoff, g_width, g_height);
 168         cairo_fill(cr);
 169 }
 170
 171 /* setup dash style */
 172 static double dashes[] = {
 173         1.0,            /* ink */
 174         2.0,            /* skip */
 175 };
 176 static int ndash = sizeof(dashes) / sizeof(dashes[0]);
 177
 178 static void draw_background_lines(cairo_t *cr,
 179                                   struct color *color,
 180                                   int g_width, int g_height,
 181                                   int g_xoff, int g_yoff,
 182                                   int min, int max)
 183 {
 184         int i;
 185
 186         /* draw background lines */
 187         cairo_set_line_width(cr, 1);
 188         cairo_set_dash(cr, dashes, ndash, 0);
 189         cairo_set_source_rgb(cr,
 190                              color->red, color->green, color->blue);
 191
 192         /* vertical lines representing time steps */
 193         for (i = 0; i <= 5; i++) {
 194                 int x = i * (g_width / 5) + g_xoff;
 195
 196                 cairo_move_to(cr, x, g_yoff);
 197                 cairo_line_to(cr, x, g_yoff + g_height);
 198                 cairo_stroke(cr);
 199         }
 200
 201         /* horizontal lines draws a line for each 10C step */
 202         for (i = min; i < max; i++) {
 203                 if (i % 10 == 0) {
 204                         int y = compute_y(i, min, max, g_height, g_yoff);
 205
 206                         cairo_move_to(cr, g_xoff, y);
 207                         cairo_line_to(cr, g_xoff + g_width, y);
 208                         cairo_stroke(cr);
 209                 }
 210         }
 211
 212         /* back to normal line style */
 213         cairo_set_dash(cr, 0, 0, 0);
 214 }
 215
 216 /* Keys: sensor identifier.
 217  *
 218  * Values: array of time_t. Each time_t is corresponding to a sensor
 219  * measure which has been used as the start point of a Bezier curve.
 220  */
 221 static GHashTable *times;
 222
 223 static void draw_sensor_smooth_curve(struct psensor *s,
 224                                      cairo_t *cr,
 225                                      double min,
 226                                      double max,
 227                                      int bt,
 228                                      int et,
 229                                      int g_width,
 230                                      int g_height,
 231                                      int g_xoff,
 232                                      int g_yoff)
 233 {
 234         int i, dt, vdt, j, k, found;
 235         double x[4], y[4], v;
 236         time_t t, t0, *stimes;
 237
 238         if (!times)
 239                 times = g_hash_table_new_full(g_str_hash,
 240                                               g_str_equal,
 241                                               free,
 242                                               free);
 243
 244         stimes = g_hash_table_lookup(times, s->id);
 245
 246         cairo_set_source_rgb(cr,
 247                              s->color->red,
 248                              s->color->green,
 249                              s->color->blue);
 250
 251         /* search the index of the first measure used as a start point
 252          * of a Bezier curve. The start and end points of the Bezier
 253          * curves must be preserved to ensure the same overall shape
 254          * of the graph. */
 255         i = 0;
 256         if (stimes) {
 257                 while (i < s->values_max_length) {
 258                         t = s->measures[i].time.tv_sec;
 259                         v = s->measures[i].value;
 260
 261                         found = 0;
 262                         if (v != UNKNOWN_DBL_VALUE && t) {
 263                                 k = 0;
 264                                 while (stimes[k]) {
 265                                         if (t == stimes[k]) {
 266                                                 found = 1;
 267                                                 break;
 268                                         }
 269                                         k++;
 270                                 }
 271                         }
 272
 273                         if (found)
 274                                 break;
 275
 276                         i++;
 277                 }
 278         }
 279
 280         stimes = malloc((s->values_max_length + 1) * sizeof(time_t));
 281         memset(stimes, 0, (s->values_max_length + 1) * sizeof(time_t));
 282         g_hash_table_insert(times, strdup(s->id), stimes);
 283
 284         if (i == s->values_max_length)
 285                 i = 0;
 286
 287         k = 0;
 288         dt = et - bt;
 289         while (i < s->values_max_length) {
 290                 j = 0;
 291                 t = 0;
 292                 while (i < s->values_max_length && j < 4) {
 293                         t = s->measures[i].time.tv_sec;
 294                         v = s->measures[i].value;
 295
 296                         if (v == UNKNOWN_DBL_VALUE || !t) {
 297                                 i++;
 298                                 continue;
 299                         }
 300
 301                         vdt = t - bt;
 302
 303                         x[0 + j] = ((double)vdt * g_width) / dt + g_xoff;
 304                         y[0 + j] = compute_y(v, min, max, g_height, g_yoff);
 305
 306                         if (j == 0)
 307                                 t0 = t;
 308
 309                         i++;
 310                         j++;
 311                 }
 312
 313                 if (j == 4) {
 314                         cairo_move_to(cr, x[0], y[0]);
 315                         cairo_curve_to(cr, x[1], y[1], x[2], y[3], x[3], y[3]);
 316                         stimes[k++] = t0;
 317                         i--;
 318                 }
 319         }
 320
 321         cairo_stroke(cr);
 322 }
 323
 324 static void draw_sensor_curve(struct psensor *s,
 325                               cairo_t *cr,
 326                               double min,
 327                               double max,
 328                               int bt,
 329                               int et,
 330                               int g_width,
 331                               int g_height,
 332                               int g_xoff,
 333                               int g_yoff)
 334 {
 335         int first, i, t, dt, vdt;
 336         double v, x, y;
 337
 338         cairo_set_source_rgb(cr,
 339                              s->color->red,
 340                              s->color->green,
 341                              s->color->blue);
 342
 343         dt = et - bt;
 344         first = 1;
 345         for (i = 0; i < s->values_max_length; i++) {
 346                 t = s->measures[i].time.tv_sec;
 347                 v = s->measures[i].value;
 348
 349                 if (v == UNKNOWN_DBL_VALUE || !t)
 350                         continue;
 351
 352                 vdt = t - bt;
 353
 354                 x = ((double)vdt * g_width) / dt + g_xoff;
 355
 356                 y = compute_y(v, min, max, g_height, g_yoff);
 357
 358                 if (first) {
 359                         cairo_move_to(cr, x, y);
 360                         first = 0;
 361                 } else {
 362                         cairo_line_to(cr, x, y);
 363                 }
 364
 365         }
 366         cairo_stroke(cr);
 367 }
 368
 369 static void display_no_graphs_warning(cairo_t *cr, int x, int y)
 370 {
 371         char *msg;
 372
 373         msg = strdup(_("No graphs enabled"));
 374
 375         cairo_select_font_face(cr,
 376                                "sans-serif",
 377                                CAIRO_FONT_SLANT_NORMAL,
 378                                CAIRO_FONT_WEIGHT_NORMAL);
 379         cairo_set_font_size(cr, 18.0);
 380
 381         cairo_move_to(cr, x, y);
 382         cairo_show_text(cr, msg);
 383
 384         free(msg);
 385 }
 386
 387 void
 388 graph_update(struct psensor **sensors,
 389              GtkWidget *w_graph,
 390              struct config *config,
 391              GtkWidget *window)
 392 {
 393         struct color *fgcolor = config->graph_fgcolor;
 394         int et, bt, width, height, g_width, g_height;
 395         double min_rpm, max_rpm, mint, maxt, min, max;
 396         char *strmin, *strmax;
 397         /* horizontal and vertical offset of the graph */
 398         int g_xoff, g_yoff, no_graphs;
 399         cairo_surface_t *cst;
 400         cairo_t *cr, *cr_pixmap;
 401         char *str_btime, *str_etime;
 402         cairo_text_extents_t te_btime, te_etime, te_max, te_min;
 403         struct psensor **sensor_cur, **enabled_sensors;
 404         GtkAllocation galloc;
 405         GtkStyleContext *style_ctx;
 406         struct graph_info info;
 407
 408         if (!gtk_widget_is_drawable(w_graph))
 409                 return;
 410
 411         enabled_sensors = psensor_list_filter_graph_enabled(sensors);
 412
 413         min_rpm = get_min_rpm(enabled_sensors);
 414         max_rpm = get_max_rpm(enabled_sensors);
 415
 416         mint = get_min_temp(enabled_sensors);
 417         strmin = psensor_value_to_str(SENSOR_TYPE_TEMP,
 418                                       mint,
 419                                       config->temperature_unit == CELSIUS);
 420
 421         maxt = get_max_temp(enabled_sensors);
 422         strmax = psensor_value_to_str(SENSOR_TYPE_TEMP,
 423                                       maxt,
 424                                       config->temperature_unit == CELSIUS);
 425
 426         et = get_graph_end_time_s(enabled_sensors);
 427         bt = get_graph_begin_time_s(config, et);
 428
 429         str_btime = time_to_str(bt);
 430         str_etime = time_to_str(et);
 431
 432         gtk_widget_get_allocation(w_graph, &galloc);
 433         width = galloc.width;
 434         height = galloc.height;
 435
 436         cst = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 437         cr = cairo_create(cst);
 438
 439         cairo_select_font_face(cr,
 440                                "sans-serif",
 441                                CAIRO_FONT_SLANT_NORMAL,
 442                                CAIRO_FONT_WEIGHT_NORMAL);
 443         cairo_set_font_size(cr, 10.0);
 444
 445         cairo_text_extents(cr, str_etime, &te_etime);
 446         cairo_text_extents(cr, str_btime, &te_btime);
 447         cairo_text_extents(cr, strmax, &te_max);
 448         cairo_text_extents(cr, strmin, &te_min);
 449
 450         g_yoff = GRAPH_V_PADDING;
 451
 452         g_height = height - GRAPH_V_PADDING;
 453         if (te_etime.height > te_btime.height)
 454                 g_height -= GRAPH_V_PADDING + te_etime.height + GRAPH_V_PADDING;
 455         else
 456                 g_height -= GRAPH_V_PADDING + te_btime.height + GRAPH_V_PADDING;
 457
 458         if (te_min.width > te_max.width)
 459                 g_xoff = (2 * GRAPH_H_PADDING) + te_max.width;
 460         else
 461                 g_xoff = (2 * GRAPH_H_PADDING) + te_min.width;
 462
 463         info.g_xoff = g_xoff;
 464         info.g_yoff = g_yoff;
 465         info.height = height;
 466
 467         style_ctx = gtk_widget_get_style_context(window);
 468         gtk_style_context_get_background_color(style_ctx,
 469                                                GTK_STATE_FLAG_NORMAL,
 470                                                &info.theme_bg_color);
 471         gtk_style_context_get_color(style_ctx,
 472                                     GTK_STATE_FLAG_NORMAL,
 473                                     &info.theme_fg_color);
 474
 475
 476         g_width = width - g_xoff - GRAPH_H_PADDING;
 477
 478         draw_graph_background(cr,
 479                               g_xoff, g_yoff, g_width, g_height,
 480                               width, config,
 481                               &info);
 482
 483         /* Set the color for text drawing */
 484         cairo_set_source_rgb(cr,
 485                              info.theme_fg_color.red,
 486                              info.theme_fg_color.green,
 487                              info.theme_fg_color.blue);
 488
 489         /* draw graph begin time */
 490         cairo_move_to(cr, g_xoff, height - GRAPH_V_PADDING);
 491         cairo_show_text(cr, str_btime);
 492         free(str_btime);
 493
 494         /* draw graph end time */
 495         cairo_move_to(cr,
 496                       width - te_etime.width - GRAPH_H_PADDING,
 497                       height - GRAPH_V_PADDING);
 498         cairo_show_text(cr, str_etime);
 499         free(str_etime);
 500
 501         draw_background_lines(cr, fgcolor,
 502                               g_width, g_height,
 503                               g_xoff, g_yoff,
 504                               mint, maxt);
 505
 506         /* .. and finaly draws the temperature graphs */
 507         if (bt && et) {
 508                 sensor_cur = enabled_sensors;
 509
 510                 cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
 511                 cairo_set_line_width(cr, 1);
 512                 no_graphs = 1;
 513                 while (*sensor_cur) {
 514                         struct psensor *s = *sensor_cur;
 515
 516                         no_graphs = 0;
 517                         if (s->type & SENSOR_TYPE_RPM) {
 518                                 min = min_rpm;
 519                                 max = max_rpm;
 520                         } else if (s->type & SENSOR_TYPE_PERCENT) {
 521                                 min = 0;
 522                                 max = get_max_value(enabled_sensors,
 523                                                     SENSOR_TYPE_PERCENT);
 524                         } else {
 525                                 min = mint;
 526                                 max = maxt;
 527                         }
 528
 529                         if (is_smooth_curves_enabled)
 530                                 draw_sensor_smooth_curve(s, cr,
 531                                                          min, max,
 532                                                          bt, et,
 533                                                          g_width, g_height,
 534                                                          g_xoff, g_yoff);
 535                         else
 536                                 draw_sensor_curve(s, cr,
 537                                                   min, max,
 538                                                   bt, et,
 539                                                   g_width, g_height,
 540                                                   g_xoff, g_yoff);
 541
 542                         sensor_cur++;
 543                 }
 544
 545                 if (no_graphs)
 546                         display_no_graphs_warning(cr,
 547                                                   g_xoff + 12,
 548                                                   g_height / 2);
 549         }
 550
 551         draw_left_region(cr, &info);
 552
 553         /* draw min and max temp */
 554         cairo_set_source_rgb(cr,
 555                              info.theme_fg_color.red,
 556                              info.theme_fg_color.green,
 557                              info.theme_fg_color.blue);
 558
 559         cairo_move_to(cr, GRAPH_H_PADDING, te_max.height + GRAPH_V_PADDING);
 560         cairo_show_text(cr, strmax);
 561         free(strmax);
 562
 563         cairo_move_to(cr,
 564                       GRAPH_H_PADDING, height - (te_min.height / 2) - g_yoff);
 565         cairo_show_text(cr, strmin);
 566         free(strmin);
 567
 568         cr_pixmap = gdk_cairo_create(gtk_widget_get_window(w_graph));
 569
 570         if (cr_pixmap) {
 571                 if (config->alpha_channel_enabled)
 572                         cairo_set_operator(cr_pixmap, CAIRO_OPERATOR_SOURCE);
 573
 574                 cairo_set_source_surface(cr_pixmap, cst, 0, 0);
 575                 cairo_paint(cr_pixmap);
 576         }
 577
 578         free(enabled_sensors);
 579
 580         cairo_destroy(cr_pixmap);
 581         cairo_surface_destroy(cst);
 582         cairo_destroy(cr);
 583 }
 584
 585 int compute_values_max_length(struct config *c)
 586 {
 587         int n, duration, interval;
 588
 589         duration = c->graph_monitoring_duration * 60;
 590         interval = c->sensor_update_interval;
 591
 592         n = 3 + ceil((((double)duration) / interval) + 0.5) + 3;
 593
 594         return n;
 595 }