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