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