src/graph.c

   1 /*
   2  * Copyright (C) 2010-2011 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 width, int height, struct config *config)
  77 {
  78         struct color *bgcolor = config->graph_bgcolor;
  79
  80         /* draw background */
  81         if (config->alpha_channel_enabled)
  82                 cairo_set_source_rgba(cr,
  83                                       bgcolor->f_red,
  84                                       bgcolor->f_green,
  85                                       bgcolor->f_blue, config->graph_bg_alpha);
  86         else
  87                 cairo_set_source_rgb(cr,
  88                                      bgcolor->f_red,
  89                                      bgcolor->f_green, bgcolor->f_blue);
  90
  91         cairo_rectangle(cr, 0, 0, width, height);
  92         cairo_fill(cr);
  93 }
  94
  95 /* setup dash style */
  96 static double dashes[] = {
  97         1.0,            /* ink */
  98         1.0,            /* skip */
  99         1.0,            /* ink */
 100         1.0             /* skip */
 101 };
 102 static int ndash = sizeof(dashes) / sizeof(dashes[0]);
 103
 104 static void draw_background_lines(cairo_t *cr,
 105                                   struct color *color,
 106                                   int g_width, int g_height,
 107                                   int g_xoff, int g_yoff,
 108                                   int min, int max)
 109 {
 110         int i;
 111
 112         /* draw background lines */
 113         cairo_set_dash(cr, dashes, ndash, 0);
 114         cairo_set_line_width(cr, 1);
 115         cairo_set_source_rgb(cr,
 116                              color->f_red, color->f_green, color->f_blue);
 117
 118         /* vertical lines representing time steps */
 119         for (i = 0; i <= 5; i++) {
 120                 int x = i * (g_width / 5) + g_xoff;
 121                 cairo_move_to(cr, x, g_yoff);
 122                 cairo_line_to(cr, x, g_yoff + g_height);
 123                 cairo_stroke(cr);
 124         }
 125
 126         /* horizontal lines draws a line for each 10C step */
 127         for (i = min; i < max; i++) {
 128                 if (i % 10 == 0) {
 129                         int y = compute_y(i, min, max, g_height, g_yoff);
 130
 131                         cairo_move_to(cr, g_xoff, y);
 132                         cairo_line_to(cr, g_xoff + g_width, y);
 133                         cairo_stroke(cr);
 134                 }
 135         }
 136
 137         /* back to normal line style */
 138         cairo_set_dash(cr, 0, 0, 0);
 139
 140 }
 141
 142 static void draw_sensor_curve(struct psensor *s,
 143                               cairo_t *cr,
 144                               double min,
 145                               double max,
 146                               int bt,
 147                               int et,
 148                               int g_width,
 149                               int g_height,
 150                               int g_xoff,
 151                               int g_yoff)
 152 {
 153         int first = 1;
 154         int i;
 155
 156         cairo_set_source_rgb(cr,
 157                              s->color->f_red,
 158                              s->color->f_green,
 159                              s->color->f_blue);
 160         cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
 161         cairo_set_line_width(cr, 1);
 162
 163         for (i = 0; i < s->values_max_length; i++) {
 164                 int x, y, t;
 165                 double v;
 166
 167                 t = s->measures[i].time.tv_sec;
 168                 v = s->measures[i].value.d_num;
 169
 170                 if (v == UNKNOWN_DBL_VALUE || !t || (t - bt) < 0)
 171                         continue;
 172
 173                 x = (t - bt) * g_width / (et - bt) + g_xoff;
 174
 175                 y = compute_y(v, min, max, g_height, g_yoff);
 176
 177                 if (first) {
 178                         cairo_move_to(cr, x, y);
 179                         first = 0;
 180                 } else {
 181                         cairo_line_to(cr, x, y);
 182                 }
 183
 184         }
 185         cairo_stroke(cr);
 186 }
 187
 188
 189 void
 190 graph_update(struct psensor **sensors,
 191              GtkWidget *w_graph,
 192              struct config *config)
 193 {
 194         struct color *fgcolor = config->graph_fgcolor;
 195         int et, bt, width, height, g_width, g_height;
 196         double min_rpm, max_rpm, mint, maxt;
 197         char *strmin, *strmax;
 198         /* horizontal and vertical offset of the graph */
 199         int g_xoff, g_yoff;
 200         cairo_surface_t *cst;
 201         cairo_t *cr, *cr_pixmap;
 202         char *str_btime, *str_etime;
 203         cairo_text_extents_t te_btime, te_etime, te_max, te_min;
 204         struct psensor **sensor_cur;
 205         GtkAllocation galloc;
 206
 207         if (!gtk_widget_is_drawable(w_graph))
 208                 return ;
 209
 210         min_rpm = get_min_rpm(sensors);
 211         max_rpm = get_max_rpm(sensors);
 212
 213         mint = get_min_temp(sensors);
 214         strmin = psensor_value_to_string(SENSOR_TYPE_TEMP, mint);
 215
 216         maxt = get_max_temp(sensors);
 217         strmax = psensor_value_to_string(SENSOR_TYPE_TEMP, maxt);
 218
 219         str_btime = time_to_str(get_graph_begin_time_s(config));
 220         str_etime = time_to_str(get_graph_end_time_s());
 221
 222         gtk_widget_get_allocation(w_graph, &galloc);
 223         width = galloc.width;
 224         height = galloc.height;
 225
 226         cst = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 227         cr = cairo_create(cst);
 228
 229         draw_graph_background(cr, width, height, config);
 230
 231         cairo_select_font_face(cr,
 232                                "sans-serif",
 233                                CAIRO_FONT_SLANT_NORMAL,
 234                                CAIRO_FONT_WEIGHT_NORMAL);
 235         cairo_set_font_size(cr, 10.0);
 236
 237         cairo_text_extents(cr, str_etime, &te_etime);
 238         cairo_text_extents(cr, str_btime, &te_btime);
 239         cairo_text_extents(cr, strmax, &te_max);
 240         cairo_text_extents(cr, strmin, &te_min);
 241
 242         g_yoff = GRAPH_V_PADDING;
 243
 244         g_height = height - GRAPH_V_PADDING;
 245         if (te_etime.height > te_btime.height)
 246                 g_height -= GRAPH_V_PADDING + te_etime.height + GRAPH_V_PADDING;
 247         else
 248                 g_height -= GRAPH_V_PADDING + te_btime.height + GRAPH_V_PADDING;
 249
 250         if (te_min.width > te_max.width)
 251                 g_xoff = (2 * GRAPH_H_PADDING) + te_max.width;
 252         else
 253                 g_xoff = (2 * GRAPH_H_PADDING) + te_min.width;
 254
 255         g_width = width - g_xoff - GRAPH_H_PADDING;
 256
 257         cairo_set_source_rgb(cr,
 258                              fgcolor->f_red, fgcolor->f_green, fgcolor->f_blue);
 259
 260         /* draw graph begin time */
 261         cairo_move_to(cr, g_xoff, height - GRAPH_V_PADDING);
 262         cairo_show_text(cr, str_btime);
 263         free(str_btime);
 264
 265         /* draw graph end time */
 266         cairo_move_to(cr,
 267                       width - te_etime.width - GRAPH_H_PADDING,
 268                       height - GRAPH_V_PADDING);
 269         cairo_show_text(cr, str_etime);
 270         free(str_etime);
 271
 272         /* draw min and max temp */
 273         cairo_move_to(cr, GRAPH_H_PADDING, te_max.height + GRAPH_V_PADDING);
 274         cairo_show_text(cr, strmax);
 275         free(strmax);
 276
 277         cairo_move_to(cr,
 278                       GRAPH_H_PADDING, height - (te_min.height / 2) - g_yoff);
 279         cairo_show_text(cr, strmin);
 280         free(strmin);
 281
 282         draw_background_lines(cr, fgcolor,
 283                               g_width, g_height,
 284                               g_xoff, g_yoff,
 285                               mint, maxt);
 286
 287         /* .. and finaly draws the temperature graphs */
 288         bt = get_graph_begin_time_s(config);
 289         et = get_graph_end_time_s();
 290
 291         if (bt && et) {
 292                 sensor_cur = sensors;
 293                 while (*sensor_cur) {
 294                         struct psensor *s = *sensor_cur;
 295
 296                         if (s->enabled) {
 297                                 double min, max;
 298
 299                                 if (is_fan_type(s->type)) {
 300                                         min = min_rpm;
 301                                         max = max_rpm;
 302                                 } else if (s->type & SENSOR_TYPE_CPU_USAGE) {
 303                                         min = 0;
 304                                         max = get_max_value
 305                                                 (sensors,
 306                                                  SENSOR_TYPE_CPU_USAGE);
 307                                 } else {
 308                                         min = mint;
 309                                         max = maxt;
 310                                 }
 311
 312                                 draw_sensor_curve(s, cr,
 313                                                   min, max,
 314                                                   bt, et,
 315                                                   g_width, g_height,
 316                                                   g_xoff, g_yoff);
 317                         }
 318
 319                         sensor_cur++;
 320                 }
 321         }
 322
 323         cr_pixmap = gdk_cairo_create(gtk_widget_get_window(w_graph));
 324
 325         if (cr_pixmap) {
 326
 327                 if (config->alpha_channel_enabled)
 328                         cairo_set_operator(cr_pixmap, CAIRO_OPERATOR_SOURCE);
 329
 330                 cairo_set_source_surface(cr_pixmap, cst, 0, 0);
 331                 cairo_paint(cr_pixmap);
 332         }
 333
 334         cairo_destroy(cr_pixmap);
 335         cairo_surface_destroy(cst);
 336         cairo_destroy(cr);
 337 }