src/graph.c

   1 /*
   2  * Copyright (C) 2010-2012 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 "log.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 static time_t get_graph_end_time_s()
  37 {
  38         struct timeval tv;
  39
  40         if (gettimeofday(&tv, NULL) == 0)
  41                 return tv.tv_sec;
  42         else
  43                 return 0;
  44 }
  45
  46 static time_t get_graph_begin_time_s(struct config *cfg)
  47 {
  48         int ct;
  49
  50         ct = get_graph_end_time_s();
  51
  52         if (!ct)
  53                 return 0;
  54
  55         return ct - cfg->graph_monitoring_duration * 60;
  56 }
  57
  58 static int compute_y(double value, double min, double max, int height, int off)
  59 {
  60         double t = value - min;
  61         return height - ((double)height * (t / (max - min))) + off;
  62 }
  63
  64 static char *time_to_str(time_t s)
  65 {
  66         char *str;
  67         /* note: localtime returns a static field, no free required */
  68         struct tm *tm = localtime(&s);
  69
  70         if (!tm)
  71                 return NULL;
  72
  73         str = malloc(6);
  74         strftime(str, 6, "%H:%M", tm);
  75
  76         return str;
  77 }
  78
  79 static void
  80 draw_graph_background(cairo_t *cr,
  81                       int g_xoff, int g_yoff,
  82                       int g_width, int g_height,
  83                       int width, int height, struct config *config,
  84                       GtkWidget *widget,
  85                       GtkWidget *window)
  86 {
  87         GtkStyleContext *style_ctx;
  88         struct color *bgcolor;
  89         GdkRGBA rgba;
  90
  91         bgcolor = config->graph_bgcolor;
  92
  93         style_ctx = gtk_widget_get_style_context(window);
  94         gtk_style_context_get_background_color(style_ctx,
  95                                                GTK_STATE_FLAG_NORMAL,
  96                                                &rgba);
  97
  98         if (config->alpha_channel_enabled)
  99                 cairo_set_source_rgba(cr,
 100                                       rgba.red,
 101                                       rgba.green,
 102                                       rgba.blue,
 103                                       config->graph_bg_alpha);
 104         else
 105                 cairo_set_source_rgb(cr,
 106                                      rgba.red,
 107                                      rgba.green,
 108                                      rgba.blue);
 109
 110         cairo_rectangle(cr, 0, 0, width, height);
 111         cairo_fill(cr);
 112         if (config->alpha_channel_enabled)
 113                 cairo_set_source_rgba(cr,
 114                                       bgcolor->f_red,
 115                                       bgcolor->f_green,
 116                                       bgcolor->f_blue,
 117                                       config->graph_bg_alpha);
 118         else
 119                 cairo_set_source_rgb(cr,
 120                                      bgcolor->f_red,
 121                                      bgcolor->f_green,
 122                                      bgcolor->f_blue);
 123
 124         cairo_rectangle(cr, g_xoff, g_yoff, g_width, g_height);
 125         cairo_fill(cr);
 126 }
 127
 128 /* setup dash style */
 129 static double dashes[] = {
 130         1.0,            /* ink */
 131         2.0,            /* skip */
 132 };
 133 static int ndash = sizeof(dashes) / sizeof(dashes[0]);
 134
 135 static void draw_background_lines(cairo_t *cr,
 136                                   struct color *color,
 137                                   int g_width, int g_height,
 138                                   int g_xoff, int g_yoff,
 139                                   int min, int max)
 140 {
 141         int i;
 142
 143         /* draw background lines */
 144         cairo_set_line_width(cr, 1);
 145         cairo_set_dash(cr, dashes, ndash, 0);
 146         cairo_set_source_rgb(cr,
 147                              color->f_red, color->f_green, color->f_blue);
 148
 149         /* vertical lines representing time steps */
 150         for (i = 0; i <= 5; i++) {
 151                 int x = i * (g_width / 5) + g_xoff;
 152                 cairo_move_to(cr, x, g_yoff);
 153                 cairo_line_to(cr, x, g_yoff + g_height);
 154                 cairo_stroke(cr);
 155         }
 156
 157         /* horizontal lines draws a line for each 10C step */
 158         for (i = min; i < max; i++) {
 159                 if (i % 10 == 0) {
 160                         int y = compute_y(i, min, max, g_height, g_yoff);
 161
 162                         cairo_move_to(cr, g_xoff, y);
 163                         cairo_line_to(cr, g_xoff + g_width, y);
 164                         cairo_stroke(cr);
 165                 }
 166         }
 167
 168         /* back to normal line style */
 169         cairo_set_dash(cr, 0, 0, 0);
 170 }
 171
 172 static void draw_sensor_curve(struct psensor *s,
 173                               cairo_t *cr,
 174                               double min,
 175                               double max,
 176                               int bt,
 177                               int et,
 178                               int g_width,
 179                               int g_height,
 180                               int g_xoff,
 181                               int g_yoff)
 182 {
 183         int first, i, x, y, t, dt, vdt;
 184         double v;
 185
 186         cairo_set_source_rgb(cr,
 187                              s->color->f_red,
 188                              s->color->f_green,
 189                              s->color->f_blue);
 190
 191         dt = et - bt;
 192         first = 1;
 193         for (i = 0; i < s->values_max_length; i++) {
 194                 t = s->measures[i].time.tv_sec;
 195                 v = s->measures[i].value;
 196
 197                 if (v == UNKNOWN_DBL_VALUE || !t)
 198                         continue;
 199
 200                 vdt = t - bt;
 201                 if (vdt < 0)
 202                         continue;
 203
 204                 x = vdt * g_width / dt + g_xoff;
 205
 206                 y = compute_y(v, min, max, g_height, g_yoff);
 207
 208                 if (first) {
 209                         cairo_move_to(cr, x, y);
 210                         first = 0;
 211                 } else {
 212                         cairo_line_to(cr, x, y);
 213                 }
 214
 215         }
 216         cairo_stroke(cr);
 217 }
 218
 219 static void display_no_graphs_warning(cairo_t *cr, int x, int y)
 220 {
 221         char *msg;
 222
 223         msg = strdup(_("No graphs enabled"));
 224
 225         cairo_select_font_face(cr,
 226                                "sans-serif",
 227                                CAIRO_FONT_SLANT_NORMAL,
 228                                CAIRO_FONT_WEIGHT_NORMAL);
 229         cairo_set_font_size(cr, 18.0);
 230
 231         cairo_move_to(cr, x, y);
 232         cairo_show_text(cr, msg);
 233
 234         free(msg);
 235 }
 236
 237 void
 238 graph_update(struct psensor **sensors,
 239              GtkWidget *w_graph,
 240              struct config *config,
 241              GtkWidget *window)
 242 {
 243         struct color *fgcolor = config->graph_fgcolor;
 244         int et, bt, width, height, g_width, g_height;
 245         double min_rpm, max_rpm, mint, maxt;
 246         char *strmin, *strmax;
 247         /* horizontal and vertical offset of the graph */
 248         int g_xoff, g_yoff, no_graphs, min, max;
 249         cairo_surface_t *cst;
 250         cairo_t *cr, *cr_pixmap;
 251         char *str_btime, *str_etime;
 252         cairo_text_extents_t te_btime, te_etime, te_max, te_min;
 253         struct psensor **sensor_cur;
 254         GtkAllocation galloc;
 255         GtkStyleContext *style_ctx;
 256         GdkRGBA rgba;
 257
 258         if (!gtk_widget_is_drawable(w_graph))
 259                 return ;
 260
 261         min_rpm = get_min_rpm(sensors);
 262         max_rpm = get_max_rpm(sensors);
 263
 264         mint = get_min_temp(sensors);
 265
 266         strmin = psensor_value_to_str(SENSOR_TYPE_TEMP,
 267                                       mint,
 268                                       config->temperature_unit == CELCIUS);
 269
 270         maxt = get_max_temp(sensors);
 271         strmax = psensor_value_to_str(SENSOR_TYPE_TEMP,
 272                                       maxt,
 273                                       config->temperature_unit == CELCIUS);
 274
 275         str_btime = time_to_str(get_graph_begin_time_s(config));
 276         str_etime = time_to_str(get_graph_end_time_s());
 277
 278         gtk_widget_get_allocation(w_graph, &galloc);
 279         width = galloc.width;
 280         height = galloc.height;
 281
 282         cst = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 283         cr = cairo_create(cst);
 284
 285         cairo_select_font_face(cr,
 286                                "sans-serif",
 287                                CAIRO_FONT_SLANT_NORMAL,
 288                                CAIRO_FONT_WEIGHT_NORMAL);
 289         cairo_set_font_size(cr, 10.0);
 290
 291         cairo_text_extents(cr, str_etime, &te_etime);
 292         cairo_text_extents(cr, str_btime, &te_btime);
 293         cairo_text_extents(cr, strmax, &te_max);
 294         cairo_text_extents(cr, strmin, &te_min);
 295
 296         g_yoff = GRAPH_V_PADDING;
 297
 298         g_height = height - GRAPH_V_PADDING;
 299         if (te_etime.height > te_btime.height)
 300                 g_height -= GRAPH_V_PADDING + te_etime.height + GRAPH_V_PADDING;
 301         else
 302                 g_height -= GRAPH_V_PADDING + te_btime.height + GRAPH_V_PADDING;
 303
 304         if (te_min.width > te_max.width)
 305                 g_xoff = (2 * GRAPH_H_PADDING) + te_max.width;
 306         else
 307                 g_xoff = (2 * GRAPH_H_PADDING) + te_min.width;
 308
 309         g_width = width - g_xoff - GRAPH_H_PADDING;
 310
 311         draw_graph_background(cr,
 312                               g_xoff, g_yoff, g_width, g_height,
 313                               width, height, config,
 314                               w_graph,
 315                               window);
 316
 317         /** Set the color for text drawing */
 318         style_ctx = gtk_widget_get_style_context(window);
 319         gtk_style_context_get_color(style_ctx, GTK_STATE_FLAG_NORMAL, &rgba);
 320         cairo_set_source_rgb(cr, rgba.red, rgba.green, rgba.blue);
 321
 322         /* draw graph begin time */
 323         cairo_move_to(cr, g_xoff, height - GRAPH_V_PADDING);
 324         cairo_show_text(cr, str_btime);
 325         free(str_btime);
 326
 327         /* draw graph end time */
 328         cairo_move_to(cr,
 329                       width - te_etime.width - GRAPH_H_PADDING,
 330                       height - GRAPH_V_PADDING);
 331         cairo_show_text(cr, str_etime);
 332         free(str_etime);
 333
 334         /* draw min and max temp */
 335         cairo_move_to(cr, GRAPH_H_PADDING, te_max.height + GRAPH_V_PADDING);
 336         cairo_show_text(cr, strmax);
 337         free(strmax);
 338
 339         cairo_move_to(cr,
 340                       GRAPH_H_PADDING, height - (te_min.height / 2) - g_yoff);
 341         cairo_show_text(cr, strmin);
 342         free(strmin);
 343
 344         draw_background_lines(cr, fgcolor,
 345                               g_width, g_height,
 346                               g_xoff, g_yoff,
 347                               mint, maxt);
 348
 349         /* .. and finaly draws the temperature graphs */
 350         bt = get_graph_begin_time_s(config);
 351         et = get_graph_end_time_s();
 352
 353         if (bt && et) {
 354                 sensor_cur = sensors;
 355
 356                 cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
 357                 cairo_set_line_width(cr, 1);
 358                 no_graphs = 1;
 359                 while (*sensor_cur) {
 360                         struct psensor *s = *sensor_cur;
 361
 362                         if (s->enabled) {
 363                                 no_graphs = 0;
 364                                 if (is_fan_type(s->type)) {
 365                                         min = min_rpm;
 366                                         max = max_rpm;
 367                                 } else if (s->type & SENSOR_TYPE_CPU_USAGE) {
 368                                         min = 0;
 369                                         max = get_max_value
 370                                                 (sensors,
 371                                                  SENSOR_TYPE_CPU_USAGE);
 372                                 } else {
 373                                         min = mint;
 374                                         max = maxt;
 375                                 }
 376
 377                                 draw_sensor_curve(s, cr,
 378                                                   min, max,
 379                                                   bt, et,
 380                                                   g_width, g_height,
 381                                                   g_xoff, g_yoff);
 382                         }
 383
 384                         sensor_cur++;
 385                 }
 386
 387                 if (no_graphs)
 388                         display_no_graphs_warning(cr,
 389                                                   g_xoff + 12,
 390                                                   g_height / 2);
 391         }
 392
 393         cr_pixmap = gdk_cairo_create(gtk_widget_get_window(w_graph));
 394
 395         if (cr_pixmap) {
 396
 397                 if (config->alpha_channel_enabled)
 398                         cairo_set_operator(cr_pixmap, CAIRO_OPERATOR_SOURCE);
 399
 400                 cairo_set_source_surface(cr_pixmap, cst, 0, 0);
 401                 cairo_paint(cr_pixmap);
 402         }
 403
 404         cairo_destroy(cr_pixmap);
 405         cairo_surface_destroy(cst);
 406         cairo_destroy(cr);
 407 }