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