Smoother curves (using Bezier algo).
[psensor.git] / src / graph.c
index 06d7c8b..a69b65a 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2012 jeanfi@gmail.com
+ * Copyright (C) 2010-2014 jeanfi@gmail.com
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * 02110-1301 USA
  */
 #include <stdlib.h>
+#include <string.h>
+
 #include <sys/time.h>
+
+#include <glib/gi18n.h>
 #include <gtk/gtk.h>
 
-#include "cfg.h"
-#include "psensor.h"
+#include <cfg.h>
+#include <plog.h>
+#include <psensor.h>
 
 /* horizontal padding */
 #define GRAPH_H_PADDING 4
@@ -50,7 +55,8 @@ static time_t get_graph_begin_time_s(struct config *cfg)
        return ct - cfg->graph_monitoring_duration * 60;
 }
 
-static int compute_y(double value, double min, double max, int height, int off)
+static double
+compute_y(double value, double min, double max, int height, int off)
 {
        double t = value - min;
        return height - ((double)height * (t / (max - min))) + off;
@@ -106,15 +112,15 @@ draw_graph_background(cairo_t *cr,
        cairo_fill(cr);
        if (config->alpha_channel_enabled)
                cairo_set_source_rgba(cr,
-                                     bgcolor->f_red,
-                                     bgcolor->f_green,
-                                     bgcolor->f_blue,
+                                     bgcolor->red,
+                                     bgcolor->green,
+                                     bgcolor->blue,
                                      config->graph_bg_alpha);
        else
                cairo_set_source_rgb(cr,
-                                    bgcolor->f_red,
-                                    bgcolor->f_green,
-                                    bgcolor->f_blue);
+                                    bgcolor->red,
+                                    bgcolor->green,
+                                    bgcolor->blue);
 
        cairo_rectangle(cr, g_xoff, g_yoff, g_width, g_height);
        cairo_fill(cr);
@@ -139,7 +145,7 @@ static void draw_background_lines(cairo_t *cr,
        cairo_set_line_width(cr, 1);
        cairo_set_dash(cr, dashes, ndash, 0);
        cairo_set_source_rgb(cr,
-                            color->f_red, color->f_green, color->f_blue);
+                            color->red, color->green, color->blue);
 
        /* vertical lines representing time steps */
        for (i = 0; i <= 5; i++) {
@@ -164,6 +170,108 @@ static void draw_background_lines(cairo_t *cr,
        cairo_set_dash(cr, 0, 0, 0);
 }
 
+/* contains the time_t of the measures which have been draw ie not the
+ * bezier control points for each sensor. */
+static GHashTable *times;
+
+static void draw_sensor_smooth_curve(struct psensor *s,
+                                    cairo_t *cr,
+                                    double min,
+                                    double max,
+                                    int bt,
+                                    int et,
+                                    int g_width,
+                                    int g_height,
+                                    int g_xoff,
+                                    int g_yoff)
+{
+       int i, dt, vdt, j, k, found;
+       double x[4], y[4], v;
+       time_t t, t0, *stimes;
+
+       if (!times)
+               times = g_hash_table_new_full(g_str_hash,
+                                             g_str_equal,
+                                             free,
+                                             free);
+
+       stimes = g_hash_table_lookup(times, s->id);
+
+       cairo_set_source_rgb(cr,
+                            s->color->red,
+                            s->color->green,
+                            s->color->blue);
+
+       i = 0;
+       if (stimes) {
+               while (i < s->values_max_length) {
+                       t = s->measures[i].time.tv_sec;
+                       v = s->measures[i].value;
+
+                       found = 0;
+                       if (v != UNKNOWN_DBL_VALUE && t) {
+                               k = 0;
+                               while (stimes[k]) {
+                                       if (t == stimes[k]) {
+                                               found = 1;
+                                               break;
+                                       }
+                                       k++;
+                               }
+                       }
+
+                       if (found)
+                               break;
+
+                       i++;
+               }
+       }
+
+       stimes = malloc((s->values_max_length + 1) * sizeof(time_t));
+       memset(stimes, 0, (s->values_max_length + 1) * sizeof(time_t));
+       g_hash_table_insert(times, strdup(s->id), stimes);
+
+       if (i == s->values_max_length)
+               i = 0;
+
+       k = 0;
+       dt = et - bt;
+       while (i < s->values_max_length) {
+               j = 0;
+               t = 0;
+               while (i < s->values_max_length && j < 4) {
+                       t = s->measures[i].time.tv_sec;
+                       v = s->measures[i].value;
+
+                       if (v == UNKNOWN_DBL_VALUE || !t) {
+                               i++;
+                               continue;
+                       }
+
+                       vdt = t - bt;
+
+                       x[0 + j] = ((double)vdt * g_width) / dt + g_xoff;
+                       y[0 + j] = compute_y(v, min, max, g_height, g_yoff);
+
+
+                       if (j == 0)
+                               t0 = t;
+
+                       i++;
+                       j++;
+               }
+
+               if (j == 4) {
+                       cairo_move_to(cr, x[0], y[0]);
+                       cairo_curve_to(cr, x[1], y[1], x[2], y[3], x[3], y[3]);
+                       stimes[k++] = t0;
+                       i--;
+               }
+       }
+
+       cairo_stroke(cr);
+}
+
 static void draw_sensor_curve(struct psensor *s,
                              cairo_t *cr,
                              double min,
@@ -175,19 +283,19 @@ static void draw_sensor_curve(struct psensor *s,
                              int g_xoff,
                              int g_yoff)
 {
-       int first, i, x, y, t, dt, vdt;
-       double v;
+       int first, i, t, dt, vdt;
+       double v, x, y;
 
        cairo_set_source_rgb(cr,
-                            s->color->f_red,
-                            s->color->f_green,
-                            s->color->f_blue);
+                            s->color->red,
+                            s->color->green,
+                            s->color->blue);
 
        dt = et - bt;
        first = 1;
        for (i = 0; i < s->values_max_length; i++) {
                t = s->measures[i].time.tv_sec;
-               v = s->measures[i].value.d_num;
+               v = s->measures[i].value;
 
                if (v == UNKNOWN_DBL_VALUE || !t)
                        continue;
@@ -196,7 +304,7 @@ static void draw_sensor_curve(struct psensor *s,
                if (vdt < 0)
                        continue;
 
-               x = vdt * g_width / dt + g_xoff;
+               x = ((double)vdt * g_width) / dt + g_xoff;
 
                y = compute_y(v, min, max, g_height, g_yoff);
 
@@ -211,6 +319,23 @@ static void draw_sensor_curve(struct psensor *s,
        cairo_stroke(cr);
 }
 
+static void display_no_graphs_warning(cairo_t *cr, int x, int y)
+{
+       char *msg;
+
+       msg = strdup(_("No graphs enabled"));
+
+       cairo_select_font_face(cr,
+                              "sans-serif",
+                              CAIRO_FONT_SLANT_NORMAL,
+                              CAIRO_FONT_WEIGHT_NORMAL);
+       cairo_set_font_size(cr, 18.0);
+
+       cairo_move_to(cr, x, y);
+       cairo_show_text(cr, msg);
+
+       free(msg);
+}
 
 void
 graph_update(struct psensor **sensors,
@@ -223,12 +348,12 @@ graph_update(struct psensor **sensors,
        double min_rpm, max_rpm, mint, maxt;
        char *strmin, *strmax;
        /* horizontal and vertical offset of the graph */
-       int g_xoff, g_yoff;
+       int g_xoff, g_yoff, no_graphs, min, max;
        cairo_surface_t *cst;
        cairo_t *cr, *cr_pixmap;
        char *str_btime, *str_etime;
        cairo_text_extents_t te_btime, te_etime, te_max, te_min;
-       struct psensor **sensor_cur;
+       struct psensor **sensor_cur, **enabled_sensors;
        GtkAllocation galloc;
        GtkStyleContext *style_ctx;
        GdkRGBA rgba;
@@ -236,19 +361,20 @@ graph_update(struct psensor **sensors,
        if (!gtk_widget_is_drawable(w_graph))
                return ;
 
-       min_rpm = get_min_rpm(sensors);
-       max_rpm = get_max_rpm(sensors);
+       enabled_sensors = psensor_list_filter_graph_enabled(sensors);
 
-       mint = get_min_temp(sensors);
+       min_rpm = get_min_rpm(enabled_sensors);
+       max_rpm = get_max_rpm(enabled_sensors);
 
-       strmin = psensor_value_to_string(SENSOR_TYPE_TEMP,
-                                        mint,
-                                        config->temperature_unit == CELCIUS);
+       mint = get_min_temp(enabled_sensors);
+       strmin = psensor_value_to_str(SENSOR_TYPE_TEMP,
+                                     mint,
+                                     config->temperature_unit == CELSIUS);
 
-       maxt = get_max_temp(sensors);
-       strmax = psensor_value_to_string(SENSOR_TYPE_TEMP,
-                                        maxt,
-                                        config->temperature_unit == CELCIUS);
+       maxt = get_max_temp(enabled_sensors);
+       strmax = psensor_value_to_str(SENSOR_TYPE_TEMP,
+                                     maxt,
+                                     config->temperature_unit == CELSIUS);
 
        str_btime = time_to_str(get_graph_begin_time_s(config));
        str_etime = time_to_str(get_graph_end_time_s());
@@ -329,44 +455,52 @@ graph_update(struct psensor **sensors,
        et = get_graph_end_time_s();
 
        if (bt && et) {
-               sensor_cur = sensors;
+               sensor_cur = enabled_sensors;
 
                cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
                cairo_set_line_width(cr, 1);
+               no_graphs = 1;
                while (*sensor_cur) {
                        struct psensor *s = *sensor_cur;
 
-                       if (s->enabled) {
-                               double min, max;
-
-                               if (is_fan_type(s->type)) {
-                                       min = min_rpm;
-                                       max = max_rpm;
-                               } else if (s->type & SENSOR_TYPE_CPU_USAGE) {
-                                       min = 0;
-                                       max = get_max_value
-                                               (sensors,
-                                                SENSOR_TYPE_CPU_USAGE);
-                               } else {
-                                       min = mint;
-                                       max = maxt;
-                               }
+                       no_graphs = 0;
+                       if (s->type & SENSOR_TYPE_RPM) {
+                               min = min_rpm;
+                               max = max_rpm;
+                       } else if (s->type & SENSOR_TYPE_PERCENT) {
+                               min = 0;
+                               max = get_max_value(enabled_sensors,
+                                                   SENSOR_TYPE_PERCENT);
+                       } else {
+                               min = mint;
+                               max = maxt;
+                       }
 
+                       if (1)
+                               draw_sensor_smooth_curve(s, cr,
+                                                        min, max,
+                                                        bt, et,
+                                                        g_width, g_height,
+                                                        g_xoff, g_yoff);
+                       else
                                draw_sensor_curve(s, cr,
                                                  min, max,
                                                  bt, et,
                                                  g_width, g_height,
                                                  g_xoff, g_yoff);
-                       }
 
                        sensor_cur++;
                }
+
+               if (no_graphs)
+                       display_no_graphs_warning(cr,
+                                                 g_xoff + 12,
+                                                 g_height / 2);
        }
 
        cr_pixmap = gdk_cairo_create(gtk_widget_get_window(w_graph));
 
        if (cr_pixmap) {
-
                if (config->alpha_channel_enabled)
                        cairo_set_operator(cr_pixmap, CAIRO_OPERATOR_SOURCE);
 
@@ -374,6 +508,8 @@ graph_update(struct psensor **sensors,
                cairo_paint(cr_pixmap);
        }
 
+       free(enabled_sensors);
+
        cairo_destroy(cr_pixmap);
        cairo_surface_destroy(cst);
        cairo_destroy(cr);