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