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 <sys/time.h>
  21 #include <gtk/gtk.h>
  22
  23 #include "cfg.h"
  24 #include "psensor.h"
  25
  26 /* horizontal padding */
  27 #define GRAPH_H_PADDING 4
  28 /* vertical padding */
  29 #define GRAPH_V_PADDING 4
  30
  31 static time_t get_graph_end_time_s()
  32 {
  33         struct timeval tv;
  34
  35         if (gettimeofday(&tv, NULL) == 0)
  36                 return tv.tv_sec;
  37         else
  38                 return 0;
  39 }
  40
  41 static time_t get_graph_begin_time_s(struct config *cfg)
  42 {
  43         int ct;
  44
  45         ct = get_graph_end_time_s();
  46
  47         if (!ct)
  48                 return 0;
  49
  50         return ct - cfg->graph_monitoring_duration * 60;
  51 }
  52
  53 static int compute_y(double value, double min, double max, int height, int off)
  54 {
  55         double t = value - min;
  56         return height - ((double)height * (t / (max - min))) + off;
  57 }
  58
  59 static char *time_to_str(time_t s)
  60 {
  61         char *str;
  62         /* note: localtime returns a static field, no free required */
  63         struct tm *tm = localtime(&s);
  64
  65         if (!tm)
  66                 return NULL;
  67
  68         str = malloc(6);
  69         strftime(str, 6, "%H:%M", tm);
  70
  71         return str;
  72 }
  73
  74 static void
  75 draw_graph_background(cairo_t *cr,
  76                       int g_xoff, int g_yoff,
  77                       int g_width, int g_height,
  78                       int width, int height, struct config *config,
  79                       GtkWidget *widget)
  80 {
  81         GtkStyleContext* style_ctx;
  82         struct color *bgcolor;
  83         GdkRGBA rgba;
  84
  85         bgcolor = config->graph_bgcolor;
  86
  87         style_ctx = gtk_widget_get_style_context(widget);
  88         gtk_style_context_get_background_color(style_ctx,
  89                                                GTK_STATE_FLAG_NORMAL,
  90                                                &rgba);
  91         if (config->alpha_channel_enabled)
  92                 cairo_set_source_rgba(cr,
  93                                       rgba.red,
  94                                       rgba.green,
  95                                       rgba.blue,
  96                                       config->graph_bg_alpha);
  97         else
  98                 cairo_set_source_rgb(cr,
  99                                      rgba.red,
 100                                      rgba.green,
 101                                      rgba.blue);
 102
 103         cairo_rectangle(cr, 0, 0, width, height);
 104         cairo_fill(cr);
 105         if (config->alpha_channel_enabled)
 106                 cairo_set_source_rgba(cr,
 107                                       bgcolor->f_red,
 108                                       bgcolor->f_green,
 109                                       bgcolor->f_blue, config->graph_bg_alpha);
 110         else
 111                 cairo_set_source_rgb(cr,
 112                                      bgcolor->f_red,
 113                                      bgcolor->f_green, bgcolor->f_blue);
 114
 115
 116
 117         cairo_rectangle(cr, g_xoff, g_yoff, g_width, g_height);
 118         cairo_fill(cr);
 119 }
 120
 121 /* setup dash style */
 122 static double dashes[] = {
 123         1.0,            /* ink */
 124         2.0,            /* skip */
 125 };
 126 static int ndash = sizeof(dashes) / sizeof(dashes[0]);
 127
 128 static void draw_background_lines(cairo_t *cr,
 129                                   struct color *color,
 130                                   int g_width, int g_height,
 131                                   int g_xoff, int g_yoff,
 132                                   int min, int max)
 133 {
 134         int i;
 135
 136         /* draw background lines */
 137         cairo_set_line_width(cr, 1);
 138         cairo_set_dash(cr, dashes, ndash, 0);
 139         cairo_set_source_rgb(cr,
 140                              color->f_red, color->f_green, color->f_blue);
 141
 142         /* vertical lines representing time steps */
 143         for (i = 0; i <= 5; i++) {
 144                 int x = i * (g_width / 5) + g_xoff;
 145                 cairo_move_to(cr, x, g_yoff);
 146                 cairo_line_to(cr, x, g_yoff + g_height);
 147                 cairo_stroke(cr);
 148         }
 149
 150         /* horizontal lines draws a line for each 10C step */
 151         for (i = min; i < max; i++) {
 152                 if (i % 10 == 0) {
 153                         int y = compute_y(i, min, max, g_height, g_yoff);
 154
 155                         cairo_move_to(cr, g_xoff, y);
 156                         cairo_line_to(cr, g_xoff + g_width, y);
 157                         cairo_stroke(cr);
 158                 }
 159         }
 160
 161         /* back to normal line style */
 162         cairo_set_dash(cr, 0, 0, 0);
 163 }
 164
 165 static void draw_sensor_curve(struct psensor *s,
 166                               cairo_t *cr,
 167                               double min,
 168                               double max,
 169                               int bt,
 170                               int et,
 171                               int g_width,
 172                               int g_height,
 173                               int g_xoff,
 174                               int g_yoff)
 175 {
 176         int first, i, x, y, t, dt, vdt;
 177         double v;
 178
 179         cairo_set_source_rgb(cr,
 180                              s->color->f_red,
 181                              s->color->f_green,
 182                              s->color->f_blue);
 183
 184         dt = et - bt;
 185         first = 1;
 186         for (i = 0; i < s->values_max_length; i++) {
 187                 t = s->measures[i].time.tv_sec;
 188                 v = s->measures[i].value.d_num;
 189
 190                 if (v == UNKNOWN_DBL_VALUE || !t)
 191                         continue;
 192
 193                 vdt = t - bt;
 194                 if (vdt < 0)
 195                         continue;
 196
 197                 x = vdt * g_width / dt + g_xoff;
 198
 199                 y = compute_y(v, min, max, g_height, g_yoff);
 200
 201                 if (first) {
 202                         cairo_move_to(cr, x, y);
 203                         first = 0;
 204                 } else {
 205                         cairo_line_to(cr, x, y);
 206                 }
 207
 208         }
 209         cairo_stroke(cr);
 210 }
 211
 212
 213 void
 214 graph_update(struct psensor **sensors,
 215              GtkWidget *w_graph,
 216              struct config *config)
 217 {
 218         struct color *fgcolor = config->graph_fgcolor;
 219         int et, bt, width, height, g_width, g_height;
 220         double min_rpm, max_rpm, mint, maxt;
 221         char *strmin, *strmax;
 222         /* horizontal and vertical offset of the graph */
 223         int g_xoff, g_yoff;
 224         cairo_surface_t *cst;
 225         cairo_t *cr, *cr_pixmap;
 226         char *str_btime, *str_etime;
 227         cairo_text_extents_t te_btime, te_etime, te_max, te_min;
 228         struct psensor **sensor_cur;
 229         GtkAllocation galloc;
 230
 231         if (!gtk_widget_is_drawable(w_graph))
 232                 return ;
 233
 234         min_rpm = get_min_rpm(sensors);
 235         max_rpm = get_max_rpm(sensors);
 236
 237         mint = get_min_temp(sensors);
 238         strmin = psensor_value_to_string(SENSOR_TYPE_TEMP, mint);
 239
 240         maxt = get_max_temp(sensors);
 241         strmax = psensor_value_to_string(SENSOR_TYPE_TEMP, maxt);
 242
 243         str_btime = time_to_str(get_graph_begin_time_s(config));
 244         str_etime = time_to_str(get_graph_end_time_s());
 245
 246         gtk_widget_get_allocation(w_graph, &galloc);
 247         width = galloc.width;
 248         height = galloc.height;
 249
 250         cst = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 251         cr = cairo_create(cst);
 252
 253         cairo_select_font_face(cr,
 254                                "sans-serif",
 255                                CAIRO_FONT_SLANT_NORMAL,
 256                                CAIRO_FONT_WEIGHT_NORMAL);
 257         cairo_set_font_size(cr, 10.0);
 258
 259         cairo_text_extents(cr, str_etime, &te_etime);
 260         cairo_text_extents(cr, str_btime, &te_btime);
 261         cairo_text_extents(cr, strmax, &te_max);
 262         cairo_text_extents(cr, strmin, &te_min);
 263
 264         g_yoff = GRAPH_V_PADDING;
 265
 266         g_height = height - GRAPH_V_PADDING;
 267         if (te_etime.height > te_btime.height)
 268                 g_height -= GRAPH_V_PADDING + te_etime.height + GRAPH_V_PADDING;
 269         else
 270                 g_height -= GRAPH_V_PADDING + te_btime.height + GRAPH_V_PADDING;
 271
 272         if (te_min.width > te_max.width)
 273                 g_xoff = (2 * GRAPH_H_PADDING) + te_max.width;
 274         else
 275                 g_xoff = (2 * GRAPH_H_PADDING) + te_min.width;
 276
 277         g_width = width - g_xoff - GRAPH_H_PADDING;
 278
 279         draw_graph_background(cr,
 280                               g_xoff, g_yoff, g_width, g_height,
 281                               width, height, config,
 282                               w_graph);
 283
 284         cairo_set_source_rgb(cr,
 285                              fgcolor->f_red, fgcolor->f_green, fgcolor->f_blue);
 286
 287         /* draw graph begin time */
 288         cairo_move_to(cr, g_xoff, height - GRAPH_V_PADDING);
 289         cairo_show_text(cr, str_btime);
 290         free(str_btime);
 291
 292         /* draw graph end time */
 293         cairo_move_to(cr,
 294                       width - te_etime.width - GRAPH_H_PADDING,
 295                       height - GRAPH_V_PADDING);
 296         cairo_show_text(cr, str_etime);
 297         free(str_etime);
 298
 299         /* draw min and max temp */
 300         cairo_move_to(cr, GRAPH_H_PADDING, te_max.height + GRAPH_V_PADDING);
 301         cairo_show_text(cr, strmax);
 302         free(strmax);
 303
 304         cairo_move_to(cr,
 305                       GRAPH_H_PADDING, height - (te_min.height / 2) - g_yoff);
 306         cairo_show_text(cr, strmin);
 307         free(strmin);
 308
 309         draw_background_lines(cr, fgcolor,
 310                               g_width, g_height,
 311                               g_xoff, g_yoff,
 312                               mint, maxt);
 313
 314         /* .. and finaly draws the temperature graphs */
 315         bt = get_graph_begin_time_s(config);
 316         et = get_graph_end_time_s();
 317
 318         if (bt && et) {
 319                 sensor_cur = sensors;
 320
 321                 cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
 322                 cairo_set_line_width(cr, 1);
 323                 while (*sensor_cur) {
 324                         struct psensor *s = *sensor_cur;
 325
 326                         if (s->enabled) {
 327                                 double min, max;
 328
 329                                 if (is_fan_type(s->type)) {
 330                                         min = min_rpm;
 331                                         max = max_rpm;
 332                                 } else if (s->type & SENSOR_TYPE_CPU_USAGE) {
 333                                         min = 0;
 334                                         max = get_max_value
 335                                                 (sensors,
 336                                                  SENSOR_TYPE_CPU_USAGE);
 337                                 } else {
 338                                         min = mint;
 339                                         max = maxt;
 340                                 }
 341
 342                                 draw_sensor_curve(s, cr,
 343                                                   min, max,
 344                                                   bt, et,
 345                                                   g_width, g_height,
 346                                                   g_xoff, g_yoff);
 347                         }
 348
 349                         sensor_cur++;
 350                 }
 351         }
 352
 353         cr_pixmap = gdk_cairo_create(gtk_widget_get_window(w_graph));
 354
 355         if (cr_pixmap) {
 356
 357                 if (config->alpha_channel_enabled)
 358                         cairo_set_operator(cr_pixmap, CAIRO_OPERATOR_SOURCE);
 359
 360                 cairo_set_source_surface(cr_pixmap, cst, 0, 0);
 361                 cairo_paint(cr_pixmap);
 362         }
 363
 364         cairo_destroy(cr_pixmap);
 365         cairo_surface_destroy(cst);
 366         cairo_destroy(cr);
 367 }