#include <malloc.h>
#include <math.h>
#include <assert.h>
+#include <stdlib.h>
#include <cairo.h>
#include <gtk/gtk.h>
#include "tickmarks.h"
+#include "graph.h"
+#include "flist.h"
+#include "lib/prio_tree.h"
+
+/*
+ * Allowable difference to show tooltip
+ */
+#define TOOLTIP_DELTA 0.08
struct xyvalue {
double x, y;
struct graph_value {
struct graph_value *next;
+ struct prio_tree_node node;
+ char *tooltip;
void *value;
};
struct graph_value *tail;
struct graph_value *values;
struct graph_label *next;
+ struct prio_tree_root prio_tree;
double r, g, b;
int value_count;
+ unsigned int tooltip_count;
struct graph *parent;
};
+struct tick_value {
+ unsigned int offset;
+ double value;
+};
+
struct graph {
char *title;
char *xtitle;
char *ytitle;
unsigned int xdim, ydim;
+ double xoffset, yoffset;
struct graph_label *labels;
struct graph_label *tail;
int per_label_limit;
+ const char *font;
+ graph_axis_unit_change_callback x_axis_unit_change_callback;
+ graph_axis_unit_change_callback y_axis_unit_change_callback;
+ unsigned int base_offset;
+ double left_extra;
+ double right_extra;
+ double top_extra;
+ double bottom_extra;
+
+ double xtick_zero;
+ double xtick_delta;
+ double xtick_zero_val;
+ double xtick_one_val;
+ double ytick_zero;
+ double ytick_delta;
+ double ytick_zero_val;
+ double ytick_one_val;
};
-struct graph *graph_new(unsigned int xdim, unsigned int ydim)
+void graph_set_size(struct graph *g, unsigned int xdim, unsigned int ydim)
+{
+ g->xdim = xdim;
+ g->ydim = ydim;
+}
+
+void graph_set_position(struct graph *g, double xoffset, double yoffset)
+{
+ g->xoffset = xoffset;
+ g->yoffset = yoffset;
+}
+
+struct graph *graph_new(unsigned int xdim, unsigned int ydim, const char *font)
{
struct graph *g;
g = calloc(1, sizeof(*g));
- g->xdim = xdim;
- g->ydim = ydim;
+ graph_set_size(g, xdim, ydim);
g->per_label_limit = -1;
+ g->font = font;
+ if (!g->font)
+ g->font = "Sans";
return g;
}
+void graph_x_axis_unit_change_notify(struct graph *g, graph_axis_unit_change_callback f)
+{
+ g->x_axis_unit_change_callback = f;
+}
+
+void graph_y_axis_unit_change_notify(struct graph *g, graph_axis_unit_change_callback f)
+{
+ g->y_axis_unit_change_callback = f;
+}
+
static int count_labels(struct graph_label *labels)
{
int count = 0;
}
}
-static void draw_centered_text(cairo_t *cr, double x, double y,
- double fontsize, const char *text)
+static void draw_aligned_text(struct graph *g, cairo_t *cr, double x, double y,
+ double fontsize, const char *text, int alignment)
{
+#define CENTERED 0
+#define LEFT_JUSTIFIED 1
+#define RIGHT_JUSTIFIED 2
+
+ double factor, direction;
cairo_text_extents_t extents;
- cairo_select_font_face (cr, "Sans",
- CAIRO_FONT_SLANT_NORMAL,
- CAIRO_FONT_WEIGHT_NORMAL);
+ switch(alignment) {
+ case CENTERED:
+ direction = -1.0;
+ factor = 0.5;
+ break;
+ case RIGHT_JUSTIFIED:
+ direction = -1.0;
+ factor = 1.0;
+ break;
+ case LEFT_JUSTIFIED:
+ default:
+ direction = 1.0;
+ factor = 1.0;
+ break;
+ }
+ cairo_select_font_face (cr, g->font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size(cr, fontsize);
cairo_text_extents(cr, text, &extents);
- x = x - (extents.width / 2 + extents.x_bearing);
+ x = x + direction * (factor * extents.width + extents.x_bearing);
y = y - (extents.height / 2 + extents.y_bearing);
cairo_move_to(cr, x, y);
cairo_show_text(cr, text);
}
-static void draw_vertical_centered_text(cairo_t *cr, double x, double y,
- double fontsize, const char *text)
+static inline void draw_centered_text(struct graph *g, cairo_t *cr, double x, double y,
+ double fontsize, const char *text)
+{
+ draw_aligned_text(g, cr, x, y, fontsize, text, CENTERED);
+}
+
+static inline void draw_right_justified_text(struct graph *g, cairo_t *cr,
+ double x, double y,
+ double fontsize, const char *text)
+{
+ draw_aligned_text(g, cr, x, y, fontsize, text, RIGHT_JUSTIFIED);
+}
+
+static inline void draw_left_justified_text(struct graph *g, cairo_t *cr,
+ double x, double y,
+ double fontsize, const char *text)
+{
+ draw_aligned_text(g, cr, x, y, fontsize, text, LEFT_JUSTIFIED);
+}
+
+static void draw_vertical_centered_text(struct graph *g, cairo_t *cr, double x,
+ double y, double fontsize,
+ const char *text)
{
double sx, sy;
cairo_text_extents_t extents;
- cairo_select_font_face (cr, "Sans",
- CAIRO_FONT_SLANT_NORMAL,
- CAIRO_FONT_WEIGHT_NORMAL);
+ cairo_select_font_face(cr, g->font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size(cr, fontsize);
cairo_text_extents(cr, text, &extents);
double *x1, double *y1, double *x2, double *y2)
{
cairo_set_source_rgb(cr, 0, 0, 0);
- cairo_set_line_width (cr, 1.0);
+ cairo_set_line_width (cr, 0.8);
- cairo_move_to(cr, 0, 0);
- cairo_line_to(cr, 0, g->ydim);
- cairo_line_to(cr, g->xdim, g->ydim);
- cairo_line_to(cr, g->xdim, 0);
- cairo_line_to(cr, 0, 0);
-
- /* for now just set margins at 10% of width. This is not very good. */
- *x1 = g->xdim / 10.0;
- *x2 = 9.0 * *x1;
- *y1 = g->ydim / 10.0;
- *y2 = 9.0 * *y1;
+ *x1 = 0.10 * g->xdim;
+ *x2 = 0.95 * g->xdim;
+ *y1 = 0.10 * g->ydim;
+ *y2 = 0.90 * g->ydim;
cairo_move_to(cr, *x1, *y1);
cairo_line_to(cr, *x1, *y2);
cairo_line_to(cr, *x1, *y1);
cairo_stroke(cr);
- draw_centered_text(cr, g->xdim / 2, g->ydim / 20, 20.0, g->title);
- draw_centered_text(cr, g->xdim / 2, g->ydim * 0.97, 14.0, g->xtitle);
- draw_vertical_centered_text(cr, g->xdim * 0.02, g->ydim / 2, 14.0, g->ytitle);
+ draw_centered_text(g, cr, g->xdim / 2, g->ydim / 20, 20.0, g->title);
+ draw_centered_text(g, cr, g->xdim / 2, g->ydim * 0.97, 14.0, g->xtitle);
+ draw_vertical_centered_text(g, cr, g->xdim * 0.02, g->ydim / 2, 14.0, g->ytitle);
cairo_stroke(cr);
}
static void graph_draw_x_ticks(struct graph *g, cairo_t *cr,
double x1, double y1, double x2, double y2,
- double minx, double maxx, int nticks)
+ double minx, double maxx, int nticks, int add_tm_text)
{
struct tickmark *tm;
double tx;
- int i;
+ int i, power_of_ten;
static double dash[] = { 1.0, 2.0 };
- nticks = calc_tickmarks(minx, maxx, nticks, &tm);
+ nticks = calc_tickmarks(minx, maxx, nticks, &tm, &power_of_ten,
+ g->x_axis_unit_change_callback == NULL, g->base_offset);
+ if (g->x_axis_unit_change_callback)
+ g->x_axis_unit_change_callback(g, power_of_ten);
for (i = 0; i < nticks; i++) {
tx = (((tm[i].value) - minx) / (maxx - minx)) * (x2 - x1) + x1;
- if (tx < x1 || tx > x2)
+
+ /*
+ * Update tick delta
+ */
+ if (!i) {
+ g->xtick_zero = tx;
+ g->xtick_zero_val = tm[0].value;
+ } else if (i == 1) {
+ g->xtick_delta = (tm[1].value - tm[0].value) / (tx - g->xtick_zero);
+ g->xtick_one_val = tm[1].value;
+ }
+
+ /* really tx < yx || tx > x2, but protect against rounding */
+ if (x1 - tx > 0.01 || tx - x2 > 0.01)
continue;
/* Draw tick mark */
- cairo_set_line_width(cr, 1.0);
+ cairo_set_line_width(cr, 0.8);
cairo_move_to(cr, tx, y2);
cairo_line_to(cr, tx, y2 + (y2 - y1) * 0.03);
cairo_stroke(cr);
cairo_stroke(cr);
cairo_restore(cr);
+ if (!add_tm_text)
+ continue;
+
/* draw tickmark label */
- draw_centered_text(cr, tx, y2 * 1.04, 12.0, tm[i].string);
+ draw_centered_text(g, cr, tx, y2 * 1.04, 12.0, tm[i].string);
cairo_stroke(cr);
-
}
}
-static void graph_draw_y_ticks(struct graph *g, cairo_t *cr,
+static double graph_draw_y_ticks(struct graph *g, cairo_t *cr,
double x1, double y1, double x2, double y2,
- double miny, double maxy, int nticks)
+ double miny, double maxy, int nticks, int add_tm_text)
{
struct tickmark *tm;
double ty;
- int i;
+ int i, power_of_ten;
static double dash[] = { 2.0, 2.0 };
- nticks = calc_tickmarks(miny, maxy, nticks, &tm);
+ nticks = calc_tickmarks(miny, maxy, nticks, &tm, &power_of_ten,
+ g->y_axis_unit_change_callback == NULL, g->base_offset);
+ if (g->y_axis_unit_change_callback)
+ g->y_axis_unit_change_callback(g, power_of_ten);
+
+ /*
+ * Use highest tickmark as top of graph, not highest value. Otherwise
+ * it's impossible to see what the max value is, if the graph is
+ * fairly flat.
+ */
+ maxy = tm[nticks - 1].value;
for (i = 0; i < nticks; i++) {
ty = y2 - (((tm[i].value) - miny) / (maxy - miny)) * (y2 - y1);
- if (ty < y1 || ty > y2)
+
+ /*
+ * Update tick delta
+ */
+ if (!i) {
+ g->ytick_zero = ty;
+ g->ytick_zero_val = tm[0].value;
+ } else if (i == 1) {
+ g->ytick_delta = (tm[1].value - tm[0].value) / (ty - g->ytick_zero);
+ g->ytick_one_val = tm[1].value;
+ }
+
+ /* really ty < y1 || ty > y2, but protect against rounding */
+ if (y1 - ty > 0.01 || ty - y2 > 0.01)
continue;
+
/* draw tick mark */
cairo_move_to(cr, x1, ty);
cairo_line_to(cr, x1 - (x2 - x1) * 0.02, ty);
cairo_stroke(cr);
cairo_restore(cr);
+ if (!add_tm_text)
+ continue;
+
/* draw tickmark label */
- draw_centered_text(cr, x1 - (x2 - x1) * 0.04, ty, 12.0, tm[i].string);
+ draw_right_justified_text(g, cr, x1 - (x2 - x1) * 0.025, ty, 12.0, tm[i].string);
cairo_stroke(cr);
}
+
+ /*
+ * Return new max to use
+ */
+ return maxy;
}
void bar_graph_draw(struct graph *bg, cairo_t *cr)
struct graph_label *lb;
cairo_save(cr);
+ cairo_translate(cr, bg->xoffset, bg->yoffset);
graph_draw_common(bg, cr, &x1, &y1, &x2, &y2);
nlabels = count_labels(bg->labels);
- space_per_label = (x2 - x1) / (double) nlabels;
+ space_per_label = (x2 - x1) / (double) nlabels;
+ /*
+ * Start bars at 0 unless we have negative values, otherwise we
+ * present a skewed picture comparing label X and X+1.
+ */
mindata = find_min_data(bg->labels);
+ if (mindata > 0)
+ mindata = 0;
+
maxdata = find_max_data(bg->labels);
if (fabs(maxdata - mindata) < 1e-20) {
- draw_centered_text(cr,
+ draw_centered_text(bg, cr,
x1 + (x2 - x1) / 2.0,
y1 + (y2 - y1) / 2.0, 20.0, "No good data");
return;
}
- graph_draw_y_ticks(bg, cr, x1, y1, x2, y2, mindata, maxdata, 10);
-
+ maxdata = graph_draw_y_ticks(bg, cr, x1, y1, x2, y2, mindata, maxdata, 10, 1);
i = 0;
for (lb = bg->labels; lb; lb = lb->next) {
int nvalues;
label_offset = bg->xdim * 0.1 + space_per_label * (double) i + space_per_label * 0.1;
draw_bars(bg, cr, lb, label_offset, bar_width, mindata, maxdata);
// draw_centered_text(cr, label_offset + (bar_width / 2.0 + bar_width * 0.1), bg->ydim * 0.93,
- draw_centered_text(cr, x1 + space_per_label * (i + 0.5), bg->ydim * 0.93,
+ draw_centered_text(bg, cr, x1 + space_per_label * (i + 0.5), bg->ydim * 0.93,
12.0, lb->label);
i++;
}
double tmp, answer = 0.0;
struct graph_label *i;
struct graph_value *j;
+ int first = 1;
for (i = g->labels; i; i = i->next)
for (j = i->values; j; j = j->next) {
tmp = getvalue(j);
+ if (first) {
+ first = 0;
+ answer = tmp;
+ }
answer = cmp(tmp, answer);
}
return answer;
void line_graph_draw(struct graph *g, cairo_t *cr)
{
double x1, y1, x2, y2;
- double minx, miny, maxx, maxy;
- double tx, ty;
+ double minx, miny, maxx, maxy, gminx, gminy, gmaxx, gmaxy;
+ double tx, ty, top_extra, bottom_extra, left_extra, right_extra;
struct graph_label *i;
struct graph_value *j;
- int first = 1;
+ int good_data = 1, first = 1;
cairo_save(cr);
+ cairo_translate(cr, g->xoffset, g->yoffset);
graph_draw_common(g, cr, &x1, &y1, &x2, &y2);
minx = find_xy_value(g, getx, mindouble);
maxx = find_xy_value(g, getx, maxdouble);
miny = find_xy_value(g, gety, mindouble);
+
+ /*
+ * Start graphs at zero, unless we have a value below. Otherwise
+ * it's hard to visually compare the read and write graph, since
+ * the lowest valued one will be the floor of the graph view.
+ */
+ if (miny > 0)
+ miny = 0;
+
maxy = find_xy_value(g, gety, maxdouble);
if (fabs(maxx - minx) < 1e-20 || fabs(maxy - miny) < 1e-20) {
- draw_centered_text(cr,
- x1 + (x2 - x1) / 2.0,
- y1 + (y2 - y1) / 2.0, 20.0, "No good Data");
- return;
+ good_data = 0;
+ minx = 0.0;
+ miny = 0.0;
+ maxx = 10.0;
+ maxy = 100.0;
}
- graph_draw_x_ticks(g, cr, x1, y1, x2, y2, minx, maxx, 10);
- graph_draw_y_ticks(g, cr, x1, y1, x2, y2, miny, maxy, 10);
+ top_extra = 0.0;
+ bottom_extra = 0.0;
+ left_extra = 0.0;
+ right_extra = 0.0;
+
+ if (g->top_extra > 0.001)
+ top_extra = fabs(maxy - miny) * g->top_extra;
+ if (g->bottom_extra > 0.001)
+ bottom_extra = fabs(maxy - miny) * g->bottom_extra;
+ if (g->left_extra > 0.001)
+ left_extra = fabs(maxx - minx) * g->left_extra;
+ if (g->right_extra > 0.001)
+ right_extra = fabs(maxx - minx) * g->right_extra;
+
+ gminx = minx - left_extra;
+ gmaxx = maxx + right_extra;
+ gminy = miny - bottom_extra;
+ gmaxy = maxy + top_extra;
- cairo_set_line_width(cr, 2.5);
+ graph_draw_x_ticks(g, cr, x1, y1, x2, y2, gminx, gmaxx, 10, good_data);
+ gmaxy = graph_draw_y_ticks(g, cr, x1, y1, x2, y2, gminy, gmaxy, 10, good_data);
+
+ if (!good_data)
+ goto skip_data;
+
+ cairo_set_line_width(cr, 1.5);
for (i = g->labels; i; i = i->next) {
first = 1;
+ if (i->r < 0) /* invisible data */
+ continue;
+
cairo_set_source_rgb(cr, i->r, i->g, i->b);
for (j = i->values; j; j = j->next) {
- tx = ((getx(j) - minx) / (maxx - minx)) * (x2 - x1) + x1;
- ty = y2 - ((gety(j) - miny) / (maxy - miny)) * (y2 - y1);
+ tx = ((getx(j) - gminx) / (gmaxx - gminx)) * (x2 - x1) + x1;
+ ty = y2 - ((gety(j) - gminy) / (gmaxy - gminy)) * (y2 - y1);
if (first) {
cairo_move_to(cr, tx, ty);
first = 0;
}
cairo_stroke(cr);
}
- cairo_restore(cr);
-}
-static void gfree(void *f)
-{
- if (f)
- free(f);
+skip_data:
+ cairo_restore(cr);
}
static void setstring(char **str, const char *value)
{
- gfree(*str);
+ free(*str);
*str = strdup(value);
}
else
bg->tail->next = i;
bg->tail = i;
+ INIT_PRIO_TREE_ROOT(&i->prio_tree);
}
-static void graph_label_add_value(struct graph_label *i, void *value)
+static void graph_label_add_value(struct graph_label *i, void *value,
+ const char *tooltip)
{
+ struct graph *g = i->parent;
struct graph_value *x;
x = malloc(sizeof(*x));
+ memset(x, 0, sizeof(*x));
x->value = value;
x->next = NULL;
- if (!i->tail) {
+ if (!i->tail)
i->values = x;
- } else {
+ else
i->tail->next = x;
- }
i->tail = x;
i->value_count++;
- if (i->parent->per_label_limit != -1 &&
- i->value_count > i->parent->per_label_limit) {
- x = i->values;
- i->values = i->values->next;
- free(x->value);
- free(x);
- i->value_count--;
+ if (tooltip) {
+ /*
+ * use msec to avoid dropping too much precision when
+ * storing as an integer.
+ */
+ double xval = getx(x);
+ double minx = xval - (g->xtick_one_val * TOOLTIP_DELTA);
+ double maxx = xval + (g->xtick_one_val * TOOLTIP_DELTA);
+ struct prio_tree_node *ret;
+
+ xval = xval * 1000.0;
+ minx = minx * 1000.0;
+ maxx = maxx * 1000.0;
+
+ INIT_PRIO_TREE_NODE(&x->node);
+ x->node.start = minx;
+ x->node.last = maxx;
+ if (x->node.last == x->node.start) {
+ x->node.last += fabs(g->xtick_delta);
+ if (x->node.last == x->node.start)
+ x->node.last++;
+ }
+
+ /*
+ * If ret != &x->node, we have an alias. Since the values
+ * should be identical, we can drop it
+ */
+ ret = prio_tree_insert(&i->prio_tree, &x->node);
+ if (ret == &x->node) {
+ x->tooltip = strdup(tooltip);
+ i->tooltip_count++;
+ }
+ }
+
+ if (g->per_label_limit != -1 &&
+ i->value_count > g->per_label_limit) {
+ int to_drop = 1;
+
+ /*
+ * If the limit was dynamically reduced, making us more
+ * than 1 entry ahead after adding this one, drop two
+ * entries. This will make us (eventually) reach the
+ * specified limit.
+ */
+ if (i->value_count - g->per_label_limit >= 2)
+ to_drop = 2;
+
+ while (to_drop--) {
+ x = i->values;
+ i->values = i->values->next;
+ if (x->tooltip) {
+ free(x->tooltip);
+ prio_tree_remove(&i->prio_tree, &x->node);
+ i->tooltip_count--;
+ }
+ free(x->value);
+ free(x);
+ i->value_count--;
+ }
}
}
i = graph_find_label(bg, label);
if (!i)
return -1;
- graph_label_add_value(i, d);
+ graph_label_add_value(i, d, NULL);
return 0;
}
int graph_add_xy_data(struct graph *bg, const char *label,
- const double x, const double y)
+ const double x, const double y, const char *tooltip)
{
struct graph_label *i;
struct xyvalue *xy;
i = graph_find_label(bg, label);
if (!i)
return -1;
- graph_label_add_value(i, xy);
+
+ graph_label_add_value(i, xy, tooltip);
return 0;
}
-static void graph_free_values(struct graph_value *values)
+static void graph_free_values(struct graph_label *l, struct graph_value *values)
{
struct graph_value *i, *next;
for (i = values; i; i = next) {
next = i->next;
- gfree(i->value);
- gfree(i);
+ free(i->value);
+ if (i->tooltip) {
+ free(i->tooltip);
+ prio_tree_remove(&l->prio_tree, &i->node);
+ l->tooltip_count--;
+ }
+ free(i);
}
}
for (i = labels; i; i = next) {
next = i->next;
- graph_free_values(i->values);
- gfree(i);
+ graph_free_values(i, i->values);
+ free(i);
}
}
struct graph_label *i;
double r, g, b;
- r = fabs(red);
- g = fabs(green);
- b = fabs(blue);
-
- if (r > 1.0)
- r = 1.0;
- if (g > 1.0)
- g = 1.0;
- if (b > 1.0)
- b =1.0;
+ if (red < 0.0) { /* invisible color */
+ r = -1.0;
+ g = -1.0;
+ b = -1.0;
+ } else {
+ r = fabs(red);
+ g = fabs(green);
+ b = fabs(blue);
+
+ if (r > 1.0)
+ r = 1.0;
+ if (g > 1.0)
+ g = 1.0;
+ if (b > 1.0)
+ b = 1.0;
+ }
for (i = gr->labels; i; i = i->next)
if (strcmp(i->label, label) == 0) {
void graph_free(struct graph *bg)
{
- gfree(bg->title);
- gfree(bg->xtitle);
- gfree(bg->ytitle);
+ free(bg->title);
+ free(bg->xtitle);
+ free(bg->ytitle);
graph_free_labels(bg->labels);
}
g->per_label_limit = per_label_limit;
}
+void graph_add_extra_space(struct graph *g, double left_percent, double right_percent,
+ double top_percent, double bottom_percent)
+{
+ g->left_extra = left_percent;
+ g->right_extra = right_percent;
+ g->top_extra = top_percent;
+ g->bottom_extra = bottom_percent;
+}
+
+/*
+ * Normally values are logged in a base unit of 0, but for other purposes
+ * it makes more sense to log in higher unit. For instance for bandwidth
+ * purposes, you may want to log in KB/sec (or MB/sec) rather than bytes/sec.
+ */
+void graph_set_base_offset(struct graph *g, unsigned int base_offset)
+{
+ g->base_offset = base_offset;
+}
+
+int graph_has_tooltips(struct graph *g)
+{
+ struct graph_label *i;
+
+ for (i = g->labels; i; i = i->next)
+ if (i->tooltip_count)
+ return 1;
+
+ return 0;
+}
+
+int graph_contains_xy(struct graph *g, int x, int y)
+{
+ int first_x = g->xoffset;
+ int last_x = g->xoffset + g->xdim;
+ int first_y = g->yoffset;
+ int last_y = g->yoffset + g->ydim;
+
+ return (x >= first_x && x <= last_x) && (y >= first_y && y <= last_y);
+}
+
+const char *graph_find_tooltip(struct graph *g, int ix, int iy)
+{
+ double x = ix, y = iy;
+ struct prio_tree_iter iter;
+ struct prio_tree_node *n;
+ struct graph_label *i;
+ struct graph_value *best = NULL;
+ double best_delta;
+ double maxy, miny;
+
+ x -= g->xoffset;
+ y -= g->yoffset;
+
+ x = g->xtick_zero_val + ((x - g->xtick_zero) * g->xtick_delta);
+ y = g->ytick_zero_val + ((y - g->ytick_zero) * g->ytick_delta);
+
+ x = x * 1000.0;
+ maxy = y + (g->ytick_one_val * TOOLTIP_DELTA);
+ miny = y - (g->ytick_one_val * TOOLTIP_DELTA);
+ best_delta = UINT_MAX;
+ i = g->labels;
+ do {
+ INIT_PRIO_TREE_ITER(&iter);
+ prio_tree_iter_init(&iter, &i->prio_tree, x, x);
+
+ n = prio_tree_next(&iter);
+ if (!n)
+ continue;
+
+ do {
+ struct graph_value *v;
+ double yval, ydiff;
+
+ v = container_of(n, struct graph_value, node);
+ yval = gety(v);
+ ydiff = fabs(yval - y);
+
+ /*
+ * zero delta, or within or match critera, break
+ */
+ if (ydiff < best_delta) {
+ best_delta = ydiff;
+ if (!best_delta ||
+ (yval >= miny && yval <= maxy)) {
+ best = v;
+ break;
+ }
+ }
+ } while ((n = prio_tree_next(&iter)) != NULL);
+
+ /*
+ * If we got matches in one label, don't check others.
+ */
+ break;
+ } while ((i = i->next) != NULL);
+
+ if (best)
+ return best->tooltip;
+
+ return NULL;
+}
projects / fio.git / blobdiff