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 <graph.h>
  31 #include <plog.h>
  32 #include <psensor.h>
  33
  34 /* horizontal padding */
  35 static const int GRAPH_H_PADDING = 4;
  36 /* vertical padding */
  37 static const int GRAPH_V_PADDING = 4;
  38
  39 bool is_smooth_curves_enabled;
  40
  41 struct graph_info {
  42         /* Horizontal position of the central area (curves) */
  43         int g_xoff;
  44         /* Vertical position of the central area (curves) */
  45         int g_yoff;
  46
  47         /* Width of the central area (curves) */
  48         int g_width;
  49         /* Height of the central area (curves) */
  50         int g_height;
  51
  52         /* Height of the drawing canvas */
  53         int height;
  54         /* Width of the drawing canvas */
  55         int width;
  56
  57         /* Background color of the current desktop theme */
  58         GdkRGBA theme_bg_color;
  59         /* Foreground color of the current desktop theme */
  60         GdkRGBA theme_fg_color;
  61 };
  62
  63 static struct psensor **list_filter_graph_enabled(struct psensor **sensors)
  64 {
  65         int n, i;
  66         struct psensor **result, **cur, *s;
  67
  68         if (!sensors)
  69                 return NULL;
  70
  71         n = psensor_list_size(sensors);
  72         result = malloc((n+1) * sizeof(struct psensor *));
  73
  74         for (cur = sensors, i = 0; *cur; cur++) {
  75                 s = *cur;
  76
  77                 if (config_is_sensor_graph_enabled(s->id))
  78                         result[i++] = s;
  79         }
  80
  81         result[i] = NULL;
  82
  83         return result;
  84 }
  85
  86 /* Return the end time of the graph i.e. the more recent measure.  If
  87  * no measure are available, return 0.
  88  * If Bezier curves are used return the measure n-3 to avoid to
  89  * display a part of the curve outside the graph area.
  90  */
  91 static time_t get_graph_end_time_s(struct psensor **sensors)
  92 {
  93         time_t ret, t;
  94         struct psensor *s;
  95         struct measure *measures;
  96         int i, n;
  97
  98         ret = 0;
  99         while (*sensors) {
 100                 s = *sensors;
 101                 measures = s->measures;
 102
 103                 if (is_smooth_curves_enabled)
 104                         n = 2;
 105                 else
 106                         n = 0;
 107
 108                 for (i = s->values_max_length - 1; i >= 0; i--) {
 109                         if (measures[i].value != UNKNOWN_DBL_VALUE) {
 110                                 if (!n) {
 111                                         t = measures[i].time.tv_sec;
 112
 113                                         if (t > ret) {
 114                                                 ret = t;
 115                                                 break;
 116                                         }
 117                                 } else {
 118                                         n--;
 119                                 }
 120                         }
 121                         i--;
 122                 }
 123
 124                 sensors++;
 125         }
 126
 127         return ret;
 128 }
 129
 130 static time_t get_graph_begin_time_s(struct config *cfg, time_t etime)
 131 {
 132         if (!etime)
 133                 return 0;
 134
 135         return etime - cfg->graph_monitoring_duration * 60;
 136 }
 137
 138 static double
 139 compute_y(double value, double min, double max, int height, int off)
 140 {
 141         double t = value - min;
 142
 143         return height - ((double)height * (t / (max - min))) + off;
 144 }
 145
 146 static char *time_to_str(time_t s)
 147 {
 148         char *str;
 149         /* note: localtime returns a static field, no free required */
 150         struct tm *tm = localtime(&s);
 151
 152         if (!tm)
 153                 return NULL;
 154
 155         str = malloc(6);
 156         strftime(str, 6, "%H:%M", tm);
 157
 158         return str;
 159 }
 160
 161 static void draw_left_region(cairo_t *cr, struct graph_info *info)
 162 {
 163         cairo_set_source_rgb(cr,
 164                              info->theme_bg_color.red,
 165                              info->theme_bg_color.green,
 166                              info->theme_bg_color.blue);
 167
 168         cairo_rectangle(cr, 0, 0, info->g_xoff, info->height);
 169         cairo_fill(cr);
 170 }
 171
 172 static void draw_right_region(cairo_t *cr, struct graph_info *info)
 173 {
 174         cairo_set_source_rgb(cr,
 175                              info->theme_bg_color.red,
 176                              info->theme_bg_color.green,
 177                              info->theme_bg_color.blue);
 178
 179
 180         cairo_rectangle(cr,
 181                         info->g_xoff + info->g_width,
 182                         0,
 183                         info->g_xoff + info->g_width + GRAPH_H_PADDING,
 184                         info->height);
 185         cairo_fill(cr);
 186 }
 187
 188 static void
 189 draw_graph_background(cairo_t *cr,
 190                       struct config *config,
 191                       struct graph_info *info)
 192 {
 193         struct color *bgcolor;
 194
 195         bgcolor = config->graph_bgcolor;
 196
 197         if (config->alpha_channel_enabled)
 198                 cairo_set_source_rgba(cr,
 199                                       info->theme_bg_color.red,
 200                                       info->theme_bg_color.green,
 201                                       info->theme_bg_color.blue,
 202                                       config->graph_bg_alpha);
 203         else
 204                 cairo_set_source_rgb(cr,
 205                                      info->theme_bg_color.red,
 206                                      info->theme_bg_color.green,
 207                                      info->theme_bg_color.blue);
 208
 209         cairo_rectangle(cr, info->g_xoff, 0, info->g_width, info->height);
 210         cairo_fill(cr);
 211
 212         if (config->alpha_channel_enabled)
 213                 cairo_set_source_rgba(cr,
 214                                       bgcolor->red,
 215                                       bgcolor->green,
 216                                       bgcolor->blue,
 217                                       config->graph_bg_alpha);
 218         else
 219                 cairo_set_source_rgb(cr,
 220                                      bgcolor->red,
 221                                      bgcolor->green,
 222                                      bgcolor->blue);
 223
 224         cairo_rectangle(cr,
 225                         info->g_xoff,
 226                         info->g_yoff,
 227                         info->g_width,
 228                         info->g_height);
 229         cairo_fill(cr);
 230 }
 231
 232 /* setup dash style */
 233 static double dashes[] = {
 234         1.0,            /* ink */
 235         2.0,            /* skip */
 236 };
 237 static int ndash = sizeof(dashes) / sizeof(dashes[0]);
 238
 239 static void draw_background_lines(cairo_t *cr,
 240                                   int min, int max,
 241                                   struct config *config,
 242                                   struct graph_info *info)
 243 {
 244         int i;
 245         double x, y;
 246         struct color *color;
 247
 248         color = config->graph_fgcolor;
 249
 250         /* draw background lines */
 251         cairo_set_line_width(cr, 1);
 252         cairo_set_dash(cr, dashes, ndash, 0);
 253         cairo_set_source_rgb(cr, color->red, color->green, color->blue);
 254
 255         /* vertical lines representing time steps */
 256         for (i = 0; i <= 5; i++) {
 257                 x = i * ((double)info->g_width / 5) + info->g_xoff;
 258                 cairo_move_to(cr, x, info->g_yoff);
 259                 cairo_line_to(cr, x, info->g_yoff + info->g_height);
 260         }
 261
 262         /* horizontal lines draws a line for each 10C step */
 263         for (i = min; i < max; i++) {
 264                 if (i % 10 == 0) {
 265                         y = compute_y(i,
 266                                       min,
 267                                       max,
 268                                       info->g_height,
 269                                       info->g_yoff);
 270
 271                         cairo_move_to(cr, info->g_xoff, y);
 272                         cairo_line_to(cr, info->g_xoff + info->g_width, y);
 273                 }
 274         }
 275
 276         cairo_stroke(cr);
 277
 278         /* back to normal line style */
 279         cairo_set_dash(cr, NULL, 0, 0);
 280 }
 281
 282 /* Keys: sensor identifier.
 283  *
 284  * Values: array of time_t. Each time_t is corresponding to a sensor
 285  * measure which has been used as the start point of a Bezier curve.
 286  */
 287 static GHashTable *times;
 288
 289 static void draw_sensor_smooth_curve(struct psensor *s,
 290                                      cairo_t *cr,
 291                                      double min,
 292                                      double max,
 293                                      int bt,
 294                                      int et,
 295                                      struct graph_info *info)
 296 {
 297         int i, dt, vdt, j, k, found;
 298         double x[4], y[4], v;
 299         time_t t, t0, *stimes;
 300
 301         if (!times)
 302                 times = g_hash_table_new_full(g_str_hash,
 303                                               g_str_equal,
 304                                               free,
 305                                               free);
 306
 307         stimes = g_hash_table_lookup(times, s->id);
 308
 309         cairo_set_source_rgb(cr,
 310                              s->color->red,
 311                              s->color->green,
 312                              s->color->blue);
 313
 314         /* search the index of the first measure used as a start point
 315          * of a Bezier curve. The start and end points of the Bezier
 316          * curves must be preserved to ensure the same overall shape
 317          * of the graph. */
 318         i = 0;
 319         if (stimes) {
 320                 while (i < s->values_max_length) {
 321                         t = s->measures[i].time.tv_sec;
 322                         v = s->measures[i].value;
 323
 324                         found = 0;
 325                         if (v != UNKNOWN_DBL_VALUE && t) {
 326                                 k = 0;
 327                                 while (stimes[k]) {
 328                                         if (t == stimes[k]) {
 329                                                 found = 1;
 330                                                 break;
 331                                         }
 332                                         k++;
 333                                 }
 334                         }
 335
 336                         if (found)
 337                                 break;
 338
 339                         i++;
 340                 }
 341         }
 342
 343         stimes = malloc((s->values_max_length + 1) * sizeof(time_t));
 344         memset(stimes, 0, (s->values_max_length + 1) * sizeof(time_t));
 345         g_hash_table_insert(times, strdup(s->id), stimes);
 346
 347         if (i == s->values_max_length)
 348                 i = 0;
 349
 350         k = 0;
 351         dt = et - bt;
 352         while (i < s->values_max_length) {
 353                 j = 0;
 354                 t = 0;
 355                 while (i < s->values_max_length && j < 4) {
 356                         t = s->measures[i].time.tv_sec;
 357                         v = s->measures[i].value;
 358
 359                         if (v == UNKNOWN_DBL_VALUE || !t) {
 360                                 i++;
 361                                 continue;
 362                         }
 363
 364                         vdt = t - bt;
 365
 366                         x[0 + j] = ((double)vdt * info->g_width)
 367                                 / dt + info->g_xoff;
 368                         y[0 + j] = compute_y(v,
 369                                              min,
 370                                              max,
 371                                              info->g_height,
 372                                              info->g_yoff);
 373
 374                         if (j == 0)
 375                                 t0 = t;
 376
 377                         i++;
 378                         j++;
 379                 }
 380
 381                 if (j == 4) {
 382                         cairo_move_to(cr, x[0], y[0]);
 383                         cairo_curve_to(cr, x[1], y[1], x[2], y[3], x[3], y[3]);
 384                         stimes[k++] = t0;
 385                         i--;
 386                 }
 387         }
 388
 389         cairo_stroke(cr);
 390 }
 391
 392 static void draw_sensor_curve(struct psensor *s,
 393                               cairo_t *cr,
 394                               double min,
 395                               double max,
 396                               int bt,
 397                               int et,
 398                               struct graph_info *info)
 399 {
 400         int first, i, t, dt, vdt;
 401         double v, x, y;
 402
 403         cairo_set_source_rgb(cr,
 404                              s->color->red,
 405                              s->color->green,
 406                              s->color->blue);
 407
 408         dt = et - bt;
 409         first = 1;
 410         for (i = 0; i < s->values_max_length; i++) {
 411                 t = s->measures[i].time.tv_sec;
 412                 v = s->measures[i].value;
 413
 414                 if (v == UNKNOWN_DBL_VALUE || !t)
 415                         continue;
 416
 417                 vdt = t - bt;
 418
 419                 x = ((double)vdt * info->g_width) / dt + info->g_xoff;
 420
 421                 y = compute_y(v, min, max, info->g_height, info->g_yoff);
 422
 423                 if (first) {
 424                         cairo_move_to(cr, x, y);
 425                         first = 0;
 426                 } else {
 427                         cairo_line_to(cr, x, y);
 428                 }
 429
 430         }
 431         cairo_stroke(cr);
 432 }
 433
 434 static void display_no_graphs_warning(cairo_t *cr, int x, int y)
 435 {
 436         char *msg;
 437
 438         msg = strdup(_("No graphs enabled"));
 439
 440         cairo_select_font_face(cr,
 441                                "sans-serif",
 442                                CAIRO_FONT_SLANT_NORMAL,
 443                                CAIRO_FONT_WEIGHT_NORMAL);
 444         cairo_set_font_size(cr, 18.0);
 445
 446         cairo_move_to(cr, x, y);
 447         cairo_show_text(cr, msg);
 448
 449         free(msg);
 450 }
 451
 452 void
 453 graph_update(struct psensor **sensors,
 454              GtkWidget *w_graph,
 455              struct config *config,
 456              GtkWidget *window)
 457 {
 458         int et, bt, width, height, g_width, g_height;
 459         double min_rpm, max_rpm, mint, maxt, min, max;
 460         char *strmin, *strmax;
 461         /* horizontal and vertical offset of the graph */
 462         int g_xoff, g_yoff, no_graphs;
 463         cairo_surface_t *cst;
 464         cairo_t *cr, *cr_pixmap;
 465         char *str_btime, *str_etime;
 466         cairo_text_extents_t te_btime, te_etime, te_max, te_min;
 467         struct psensor **sensor_cur, **enabled_sensors;
 468         GtkAllocation galloc;
 469         GtkStyleContext *style_ctx;
 470         struct graph_info info;
 471
 472         if (!gtk_widget_is_drawable(w_graph))
 473                 return;
 474
 475         enabled_sensors = list_filter_graph_enabled(sensors);
 476
 477         min_rpm = get_min_rpm(enabled_sensors);
 478         max_rpm = get_max_rpm(enabled_sensors);
 479
 480         mint = get_min_temp(enabled_sensors);
 481         strmin = psensor_value_to_str(SENSOR_TYPE_TEMP,
 482                                       mint,
 483                                       config->temperature_unit == CELSIUS);
 484
 485         maxt = get_max_temp(enabled_sensors);
 486         strmax = psensor_value_to_str(SENSOR_TYPE_TEMP,
 487                                       maxt,
 488                                       config->temperature_unit == CELSIUS);
 489
 490         et = get_graph_end_time_s(enabled_sensors);
 491         bt = get_graph_begin_time_s(config, et);
 492
 493         str_btime = time_to_str(bt);
 494         str_etime = time_to_str(et);
 495
 496         gtk_widget_get_allocation(w_graph, &galloc);
 497         width = galloc.width;
 498         info.width = galloc.width;
 499         height = galloc.height;
 500         info.height = height;
 501
 502
 503         cst = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 504         cr = cairo_create(cst);
 505
 506         cairo_select_font_face(cr,
 507                                "sans-serif",
 508                                CAIRO_FONT_SLANT_NORMAL,
 509                                CAIRO_FONT_WEIGHT_NORMAL);
 510         cairo_set_font_size(cr, 10.0);
 511
 512         cairo_text_extents(cr, str_etime, &te_etime);
 513         cairo_text_extents(cr, str_btime, &te_btime);
 514         cairo_text_extents(cr, strmax, &te_max);
 515         cairo_text_extents(cr, strmin, &te_min);
 516
 517         g_yoff = GRAPH_V_PADDING;
 518         info.g_yoff = g_yoff;
 519
 520         g_height = height - GRAPH_V_PADDING;
 521         if (te_etime.height > te_btime.height)
 522                 g_height -= GRAPH_V_PADDING + te_etime.height + GRAPH_V_PADDING;
 523         else
 524                 g_height -= GRAPH_V_PADDING + te_btime.height + GRAPH_V_PADDING;
 525
 526         info.g_height = g_height;
 527
 528         if (te_min.width > te_max.width)
 529                 g_xoff = (2 * GRAPH_H_PADDING) + te_max.width;
 530         else
 531                 g_xoff = (2 * GRAPH_H_PADDING) + te_min.width;
 532
 533         info.g_xoff = g_xoff;
 534
 535         style_ctx = gtk_widget_get_style_context(window);
 536         gtk_style_context_get_background_color(style_ctx,
 537                                                GTK_STATE_FLAG_NORMAL,
 538                                                &info.theme_bg_color);
 539         gtk_style_context_get_color(style_ctx,
 540                                     GTK_STATE_FLAG_NORMAL,
 541                                     &info.theme_fg_color);
 542
 543         g_width = width - g_xoff - GRAPH_H_PADDING;
 544         info.g_width = g_width;
 545
 546         draw_graph_background(cr, config, &info);
 547
 548         /* Set the color for text drawing */
 549         cairo_set_source_rgb(cr,
 550                              info.theme_fg_color.red,
 551                              info.theme_fg_color.green,
 552                              info.theme_fg_color.blue);
 553
 554         /* draw graph begin time */
 555         cairo_move_to(cr, g_xoff, height - GRAPH_V_PADDING);
 556         cairo_show_text(cr, str_btime);
 557         free(str_btime);
 558
 559         /* draw graph end time */
 560         cairo_move_to(cr,
 561                       width - te_etime.width - GRAPH_H_PADDING,
 562                       height - GRAPH_V_PADDING);
 563         cairo_show_text(cr, str_etime);
 564         free(str_etime);
 565
 566         draw_background_lines(cr, mint, maxt, config, &info);
 567
 568         /* .. and finaly draws the temperature graphs */
 569         if (bt && et) {
 570                 sensor_cur = enabled_sensors;
 571
 572                 cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
 573                 cairo_set_line_width(cr, 1);
 574                 no_graphs = 1;
 575                 while (*sensor_cur) {
 576                         struct psensor *s = *sensor_cur;
 577
 578                         no_graphs = 0;
 579                         if (s->type & SENSOR_TYPE_RPM) {
 580                                 min = min_rpm;
 581                                 max = max_rpm;
 582                         } else if (s->type & SENSOR_TYPE_PERCENT) {
 583                                 min = 0;
 584                                 max = get_max_value(enabled_sensors,
 585                                                     SENSOR_TYPE_PERCENT);
 586                         } else {
 587                                 min = mint;
 588                                 max = maxt;
 589                         }
 590
 591                         if (is_smooth_curves_enabled)
 592                                 draw_sensor_smooth_curve(s, cr,
 593                                                          min, max,
 594                                                          bt, et,
 595                                                          &info);
 596                         else
 597                                 draw_sensor_curve(s, cr,
 598                                                   min, max,
 599                                                   bt, et,
 600                                                   &info);
 601
 602                         sensor_cur++;
 603                 }
 604
 605                 if (no_graphs)
 606                         display_no_graphs_warning(cr,
 607                                                   g_xoff + 12,
 608                                                   g_height / 2);
 609         }
 610
 611         draw_left_region(cr, &info);
 612         draw_right_region(cr, &info);
 613
 614         /* draw min and max temp */
 615         cairo_set_source_rgb(cr,
 616                              info.theme_fg_color.red,
 617                              info.theme_fg_color.green,
 618                              info.theme_fg_color.blue);
 619
 620         cairo_move_to(cr, GRAPH_H_PADDING, te_max.height + GRAPH_V_PADDING);
 621         cairo_show_text(cr, strmax);
 622         free(strmax);
 623
 624         cairo_move_to(cr,
 625                       GRAPH_H_PADDING, height - (te_min.height / 2) - g_yoff);
 626         cairo_show_text(cr, strmin);
 627         free(strmin);
 628
 629         cr_pixmap = gdk_cairo_create(gtk_widget_get_window(w_graph));
 630
 631         if (cr_pixmap) {
 632                 if (config->alpha_channel_enabled)
 633                         cairo_set_operator(cr_pixmap, CAIRO_OPERATOR_SOURCE);
 634
 635                 cairo_set_source_surface(cr_pixmap, cst, 0, 0);
 636                 cairo_paint(cr_pixmap);
 637         }
 638
 639         free(enabled_sensors);
 640
 641         cairo_destroy(cr_pixmap);
 642         cairo_surface_destroy(cst);
 643         cairo_destroy(cr);
 644 }
 645
 646 int compute_values_max_length(struct config *c)
 647 {
 648         int n, duration, interval;
 649
 650         duration = c->graph_monitoring_duration * 60;
 651         interval = c->sensor_update_interval;
 652
 653         n = 3 + ceil((((double)duration) / interval) + 0.5) + 3;
 654
 655         return n;
 656 }