/* * Copyright (C) 2012 Fusion-io * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License v2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Parts of this file were imported from Jens Axboe's blktrace sources (also GPL) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "plot.h" static int io_graph_scale = 8; static int graph_width = 700; static int graph_height = 250; static int graph_circle_extra = 30; static int graph_inner_x_margin = 2; static int graph_inner_y_margin = 2; static int graph_tick_len = 5; static int graph_left_pad = 120; static int tick_label_pad = 16; static int tick_font_size = 15; static char *font_family = "sans-serif"; /* this is the title for the whole page */ static int plot_title_height = 50; static int plot_title_font_size = 25; /* this is the label at the top of each plot */ static int plot_label_height = 60; static int plot_label_font_size = 20; /* label for each axis is slightly smaller */ static int axis_label_font_size = 16; int legend_x_off = 45; int legend_y_off = -10; int legend_font_size = 15; int legend_width = 80; static int rolling_avg_secs = 0; static int line_len = 1024; static char line[1024]; static int final_height = 0; static int final_width = 0; static char *colors[] = { "blue", "darkgreen", "red", "darkviolet", "orange", "aqua", "brown", "#00FF00", "yellow", "coral", "black", "darkred", "fuchsia", "crimson", NULL }; extern unsigned int longest_proc_name; char *pick_color(void) { static int color_index; char *ret = colors[color_index]; if (!ret) { color_index = 0; ret = colors[color_index]; } color_index++; return ret; } char *pick_fio_color(void) { static int fio_color_index; char *ret = colors[fio_color_index]; if (!ret) { fio_color_index = 0; ret = colors[fio_color_index]; } fio_color_index += 2; return ret; } static int cpu_color_index; char *pick_cpu_color(void) { char *ret = colors[cpu_color_index]; if (!ret) { cpu_color_index = 0; ret = colors[cpu_color_index]; } cpu_color_index++; return ret; } void reset_cpu_color(void) { cpu_color_index = 0; } struct graph_line_data *alloc_line_data(unsigned int min_seconds, unsigned int max_seconds, unsigned int stop_seconds) { int size = sizeof(struct graph_line_data) + (stop_seconds + 1) * sizeof(struct graph_line_pair); struct graph_line_data *gld; gld = calloc(1, size); if (!gld) { fprintf(stderr, "Unable to allocate memory for graph data\n"); exit(1); } gld->min_seconds = min_seconds; gld->max_seconds = max_seconds; gld->stop_seconds = stop_seconds; return gld; } struct graph_dot_data *alloc_dot_data(unsigned int min_seconds, unsigned int max_seconds, u64 min_offset, u64 max_offset, unsigned int stop_seconds, char *color, char *label) { int size; int arr_size; int rows = graph_height * io_graph_scale; int cols = graph_width; struct graph_dot_data *gdd; size = sizeof(struct graph_dot_data); /* the number of bits */ arr_size = (rows + 1) * cols; /* the number of bytes */ arr_size = (arr_size + 7) / 8; gdd = calloc(1, size + arr_size); if (!gdd) { fprintf(stderr, "Unable to allocate memory for graph data\n"); exit(1); } gdd->min_seconds = min_seconds; gdd->max_seconds = max_seconds; gdd->stop_seconds = stop_seconds; gdd->rows = rows; gdd->cols = cols; gdd->min_offset = min_offset; gdd->max_offset = max_offset; gdd->color = color; gdd->label = label; if (strlen(label) > longest_proc_name) longest_proc_name = strlen(label); return gdd; } void set_gdd_bit(struct graph_dot_data *gdd, u64 offset, double bytes, double time) { double bytes_per_row = (double)(gdd->max_offset - gdd->min_offset + 1) / gdd->rows; double secs_per_col = (double)(gdd->max_seconds - gdd->min_seconds) / gdd->cols; double col; double row; int col_int; int row_int; int bit_index; int arr_index; int bit_mod; double mod = bytes_per_row; if (offset > gdd->max_offset || offset < gdd->min_offset) return; time = time / 1000000000.0; if (time < gdd->min_seconds || time > gdd->max_seconds) return; gdd->total_ios++; while (bytes > 0 && offset <= gdd->max_offset) { row = (double)(offset - gdd->min_offset) / bytes_per_row; col = (time - gdd->min_seconds) / secs_per_col; col_int = floor(col); row_int = floor(row); bit_index = row_int * gdd->cols + col_int; arr_index = bit_index / 8; bit_mod = bit_index % 8; gdd->data[arr_index] |= 1 << bit_mod; offset += mod; bytes -= mod; } } static double rolling_avg(struct graph_line_pair *data, int index, int distance) { double sum = 0; int start; if (distance < 0) distance = 1; if (distance > index) { start = 0; } else { start = index - distance; } distance = 0; while (start <= index) { double avg; if (data[start].count) avg = ((double)data[start].sum) / data[start].count; else avg= 0; sum += avg; distance++; start++; } return sum / distance; } void write_svg_header(int fd) { char *spaces = " \n"; char *header = "\n"; char *filter1 ="\n " "\n " "\n " "\n " "\n"; char *filter2 ="\n " "\n " "\n " "\n " "\n"; char *filter3 ="\n " "\n " " " "\n " "\n " "\n"; char *defs_start = "\n"; char *defs_close = "\n"; final_width = 0; final_height = 0; write(fd, header, strlen(header)); /* write a bunch of spaces so we can stuff in the width and height later */ write(fd, spaces, strlen(spaces)); write(fd, spaces, strlen(spaces)); write(fd, spaces, strlen(spaces)); write(fd, defs_start, strlen(defs_start)); write(fd, filter1, strlen(filter1)); write(fd, filter2, strlen(filter2)); write(fd, filter3, strlen(filter3)); write(fd, defs_close, strlen(defs_close)); } /* svg y offset for the traditional 0,0 (bottom left corner) of the plot */ static int axis_y(void) { return plot_label_height + graph_height + graph_inner_y_margin; } /* this gives you the correct pixel for a given offset from the bottom left y axis */ static double axis_y_off_double(double y) { return plot_label_height + graph_height - y; } static int axis_y_off(int y) { return axis_y_off_double(y); } /* svg x axis offset from 0 */ static int axis_x(void) { return graph_left_pad; } /* the correct pixel for a given X offset */ static double axis_x_off_double(double x) { return graph_left_pad + graph_inner_x_margin + x; } static int axis_x_off(int x) { return (int)axis_x_off_double(x); } /* * this draws a backing rectangle for the plot and it * also creates a new svg element so our offsets can * be relative to this one plot. */ void setup_axis(struct plot *plot) { int ret; int len; int fd = plot->fd; int bump_height = tick_font_size * 3 + axis_label_font_size; int local_legend_width = legend_width; if (plot->no_legend) local_legend_width = 0; plot->total_width = axis_x_off(graph_width) + graph_left_pad / 2 + local_legend_width; plot->total_height = axis_y() + tick_label_pad + tick_font_size; if (plot->add_xlabel) plot->total_height += bump_height; /* backing rect */ snprintf(line, line_len, "", plot->start_x_offset, plot->start_y_offset, plot->total_width + 40, plot->total_height + 20); len = strlen(line); write(fd, line, len); snprintf(line, line_len, "", plot->start_x_offset + 15, plot->start_y_offset, plot->total_width, plot->total_height); len = strlen(line); write(fd, line, len); plot->total_height += 20; plot->total_width += 20; if (plot->total_height + plot->start_y_offset > final_height) final_height = plot->total_height + plot->start_y_offset; if (plot->start_x_offset + plot->total_width + 40 > final_width) final_width = plot->start_x_offset + plot->total_width + 40; /* create an svg object for all our coords to be relative against */ snprintf(line, line_len, "\n", plot->start_x_offset, plot->start_y_offset); write(fd, line, strlen(line)); snprintf(line, 1024, "\n", axis_x(), axis_y(), graph_width + graph_inner_x_margin * 2, axis_y_off(graph_height) - graph_inner_y_margin, axis_x()); len = strlen(line); ret = write(fd, line, len); if (ret != len) { fprintf(stderr, "failed to write svg axis\n"); exit(1); } } /* * this draws a backing rectangle for the plot and it * also creates a new svg element so our offsets can * be relative to this one plot. */ void setup_axis_spindle(struct plot *plot) { int len; int fd = plot->fd; int bump_height = tick_font_size * 3 + axis_label_font_size; legend_x_off = -60; plot->total_width = axis_x_off(graph_width) + legend_width; plot->total_height = axis_y() + tick_label_pad + tick_font_size; if (plot->add_xlabel) plot->total_height += bump_height; /* backing rect */ snprintf(line, line_len, "", plot->start_x_offset, plot->start_y_offset, plot->total_width + 10, plot->total_height + 20); len = strlen(line); write(fd, line, len); snprintf(line, line_len, "", plot->start_x_offset + 15, plot->start_y_offset, plot->total_width - 30, plot->total_height); len = strlen(line); write(fd, line, len); plot->total_height += 20; if (plot->total_height + plot->start_y_offset > final_height) final_height = plot->total_height + plot->start_y_offset; if (plot->start_x_offset + plot->total_width + 40 > final_width) final_width = plot->start_x_offset + plot->total_width + 40; /* create an svg object for all our coords to be relative against */ snprintf(line, line_len, "\n", plot->start_x_offset, plot->start_y_offset); write(fd, line, strlen(line)); } /* draw a plot title. This should be done only once, * and it bumps the plot width/height numbers by * what it draws. * * Call this before setting up the first axis */ void set_plot_title(struct plot *plot, char *title) { int len; int fd = plot->fd; plot->total_height = plot_title_height; plot->total_width = axis_x_off(graph_width) + graph_left_pad / 2 + legend_width; /* backing rect */ snprintf(line, line_len, "", plot->start_y_offset, plot->total_width + 40, plot_title_height + 20); len = strlen(line); write(fd, line, len); snprintf(line, line_len, "%s\n", axis_x_off(graph_width / 2), plot->start_y_offset + plot_title_height / 2, font_family, plot_title_font_size, "middle", title); plot->start_y_offset += plot_title_height; len = strlen(line); write(fd, line, len); } #define TICK_MINI_STEPS 3 static double find_step(double first, double last, int num_ticks) { int mini_step[TICK_MINI_STEPS] = { 1, 2, 5 }; int cur_mini_step = 0; double step = (last - first) / num_ticks; double log10 = log(10); /* Round to power of 10 */ step = exp(floor(log(step) / log10) * log10); /* Scale down step to provide enough ticks */ while (cur_mini_step < TICK_MINI_STEPS && (last - first) / (step * mini_step[cur_mini_step]) > num_ticks) cur_mini_step++; if (cur_mini_step > 0) step *= mini_step[cur_mini_step - 1]; return step; } /* * create evenly spread out ticks along the xaxis. if tick only is set * this just makes the ticks, otherwise it labels each tick as it goes */ void set_xticks(struct plot *plot, int num_ticks, int first, int last) { int pixels_per_tick; double step; int i; int tick_y = axis_y_off(graph_tick_len) + graph_inner_y_margin; int tick_x = axis_x(); int tick_only = plot->add_xlabel == 0; int text_y = axis_y() + tick_label_pad; char *middle = "middle"; char *start = "start"; step = find_step(first, last, num_ticks); /* * We don't want last two ticks to be too close together so subtract * 20% of the step from the interval */ num_ticks = (double)(last - first - step) / step + 1; pixels_per_tick = graph_width * step / (double)(last - first); for (i = 0; i < num_ticks; i++) { char *anchor; if (i != 0) { snprintf(line, line_len, "\n", tick_x, tick_y, graph_tick_len); write(plot->fd, line, strlen(line)); anchor = middle; } else { anchor = start; } if (!tick_only) { if (step >= 1) snprintf(line, line_len, "%d\n", tick_x, text_y, font_family, tick_font_size, anchor, (int)(first + step * i)); else snprintf(line, line_len, "%.2f\n", tick_x, text_y, font_family, tick_font_size, anchor, first + step * i); write(plot->fd, line, strlen(line)); } tick_x += pixels_per_tick; } if (!tick_only) { if (step >= 1) snprintf(line, line_len, "%d\n", axis_x_off(graph_width - 2), text_y, font_family, tick_font_size, last); else snprintf(line, line_len, "%.2f\n", axis_x_off(graph_width - 2), text_y, font_family, tick_font_size, (double)last); write(plot->fd, line, strlen(line)); } } void set_ylabel(struct plot *plot, char *label) { int len; int fd = plot->fd; snprintf(line, line_len, "%s\n", graph_left_pad / 2 - axis_label_font_size, axis_y_off(graph_height / 2), font_family, graph_left_pad / 2 - axis_label_font_size, (int)axis_y_off(graph_height / 2), axis_label_font_size, "middle", label); len = strlen(line); write(fd, line, len); } void set_xlabel(struct plot *plot, char *label) { int len; int fd = plot->fd; snprintf(line, line_len, "%s\n", axis_x_off(graph_width / 2), axis_y() + tick_font_size * 3 + axis_label_font_size / 2, font_family, axis_label_font_size, "middle", label); len = strlen(line); write(fd, line, len); } /* * create evenly spread out ticks along the y axis. * The ticks are labeled as it goes */ void set_yticks(struct plot *plot, int num_ticks, int first, int last, char *units) { int pixels_per_tick = graph_height / num_ticks; int step = (last - first) / num_ticks; int i; int tick_y = 0; int text_x = axis_x() - 6; int tick_x = axis_x(); char *anchor = "end"; for (i = 0; i < num_ticks; i++) { if (i != 0) { snprintf(line, line_len, "\n", tick_x, axis_y_off(tick_y), axis_x_off(graph_width), axis_y_off(tick_y)); write(plot->fd, line, strlen(line)); } snprintf(line, line_len, "%d%s\n", text_x, axis_y_off(tick_y - tick_font_size / 2), font_family, tick_font_size, anchor, first + step * i, units); write(plot->fd, line, strlen(line)); tick_y += pixels_per_tick; } snprintf(line, line_len, "%d%s\n", text_x, axis_y_off(graph_height), font_family, tick_font_size, anchor, last, units); write(plot->fd, line, strlen(line)); } void set_plot_label(struct plot *plot, char *label) { int len; int fd = plot->fd; snprintf(line, line_len, "%s\n", axis_x() + graph_width / 2, plot_label_height / 2, font_family, plot_label_font_size, "middle", label); len = strlen(line); write(fd, line, len); } static void close_svg(int fd) { char *close_line = "\n"; write(fd, close_line, strlen(close_line)); } int close_plot(struct plot *plot) { close_svg(plot->fd); if (plot->direction == PLOT_DOWN) plot->start_y_offset += plot->total_height; else if (plot->direction == PLOT_ACROSS) plot->start_x_offset += plot->total_width; return 0; } struct plot *alloc_plot(void) { struct plot *plot; plot = calloc(1, sizeof(*plot)); if (!plot) { fprintf(stderr, "Unable to allocate memory %s\n", strerror(errno)); exit(1); } plot->fd = 0; return plot; } int close_plot_file(struct plot *plot) { int ret; ret = lseek(plot->fd, 0, SEEK_SET); if (ret == (off_t)-1) { perror("seek"); exit(1); } final_width = ((final_width + 1) / 2) * 2; final_height = ((final_height + 1) / 2) * 2; snprintf(line, line_len, "\n", final_width, final_height); write(plot->fd, line, strlen(line)); snprintf(line, line_len, "\n", final_width, final_height); write(plot->fd, line, strlen(line)); close(plot->fd); plot->fd = 0; return 0; } void set_plot_output(struct plot *plot, char *filename) { int fd; if (plot->fd) close_plot_file(plot); fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600); if (fd < 0) { fprintf(stderr, "Unable to open output file %s err %s\n", filename, strerror(errno)); exit(1); } plot->fd = fd; plot->start_y_offset = plot->start_x_offset = 0; write_svg_header(fd); } char *byte_unit_names[] = { "", "K", "M", "G", "T", "P", "E", "Z", "Y", "unobtainium" }; int MAX_BYTE_UNIT_SCALE = 9; char *time_unit_names[] = { "n", "u", "m", "s" }; int MAX_TIME_UNIT_SCALE = 3; void scale_line_graph_bytes(u64 *max, char **units, u64 factor) { int scale = 0; u64 val = *max; u64 div = 1; while (val > factor * 64) { val /= factor; scale++; div *= factor; } *units = byte_unit_names[scale]; if (scale == 0) return; if (scale > MAX_BYTE_UNIT_SCALE) scale = MAX_BYTE_UNIT_SCALE; *max /= div; } void scale_line_graph_time(u64 *max, char **units) { int scale = 0; u64 val = *max; u64 div = 1; while (val > 1000 * 10) { val /= 1000; scale++; div *= 1000; if (scale == MAX_TIME_UNIT_SCALE) break; } *units = time_unit_names[scale]; if (scale == 0) return; *max /= div; } int svg_line_graph(struct plot *plot, struct graph_line_data *gld, char *color, int thresh1, int thresh2) { unsigned int i; double val; double avg; int rolling; int fd = plot->fd; char *start = "max) / graph_height; double xscale = (double)(gld->max_seconds - gld->min_seconds - 1) / graph_width; char c = 'M'; double x; int printed_header = 0; int printed_lines = 0; if (thresh1 && thresh2) rolling = 0; else if (rolling_avg_secs) rolling = rolling_avg_secs; else rolling = (gld->stop_seconds - gld->min_seconds) / 25; for (i = gld->min_seconds; i < gld->stop_seconds; i++) { avg = rolling_avg(gld->data, i, rolling); if (yscale == 0) val = 0; else val = avg / yscale; if (val > graph_height) val = graph_height; if (val < 0) val = 0; x = (double)(i - gld->min_seconds) / xscale; if (!thresh1 && !thresh2) { if (!printed_header) { write(fd, start, strlen(start)); printed_header = 1; } /* in full line mode, everything in the graph is connected */ snprintf(line, line_len, "%c %d %d ", c, axis_x_off(x), axis_y_off(val)); c = 'L'; write(fd, line, strlen(line)); printed_lines = 1; } else if (avg > thresh1 || avg > thresh2) { int len = 10; if (!printed_header) { write(fd, start, strlen(start)); printed_header = 1; } /* otherwise, we just print a bar up there to show this one data point */ if (i >= gld->stop_seconds - 2) len = -10; /* * we don't use the rolling averages here to show high * points in the data */ snprintf(line, line_len, "M %d %d h %d ", axis_x_off(x), axis_y_off(val), len); write(fd, line, strlen(line)); printed_lines = 1; } } if (printed_lines) { snprintf(line, line_len, "\" fill=\"none\" stroke=\"%s\" stroke-width=\"2\"/>\n", color); write(fd, line, strlen(line)); } if (plot->timeline) svg_write_time_line(plot, plot->timeline); return 0; } void svg_write_time_line(struct plot *plot, int col) { snprintf(line, line_len, "\n", axis_x_off(col), axis_y_off(0), axis_x_off(col), axis_y_off(graph_height)); write(plot->fd, line, strlen(line)); } static int svg_add_io(int fd, double row, double col, double width, double height, char *color) { float rx = 0; snprintf(line, line_len, "\n", axis_x_off_double(col), axis_y_off_double(row), width, height, rx, color); return write(fd, line, strlen(line)); } int svg_io_graph_movie_array(struct plot *plot, struct pid_plot_history *pph) { double cell_index; double movie_row; double movie_col; int i; for (i = 0; i < pph->num_used; i++) { cell_index = pph->history[i]; movie_row = floor(cell_index / graph_width); movie_col = cell_index - movie_row * graph_width; svg_add_io(plot->fd, movie_row, movie_col, 4, 4, pph->color); } return 0; } static float spindle_steps = 0; void rewind_spindle_steps(int num) { spindle_steps -= num * 0.01; } int svg_io_graph_movie_array_spindle(struct plot *plot, struct pid_plot_history *pph) { double cell_index; int i; int num_circles = 0; double cells_per_circle; double circle_num; double degrees_per_cell; double rot; double center_x; double center_y; double graph_width_extra = graph_width + graph_circle_extra; double graph_height_extra = graph_height + graph_circle_extra; double radius;; if (graph_width_extra > graph_height_extra) graph_width_extra = graph_height_extra; if (graph_width_extra < graph_height_extra) graph_height_extra = graph_width_extra; radius = graph_width_extra; center_x = axis_x_off_double(graph_width_extra / 2); center_y = axis_y_off_double(graph_height_extra / 2); snprintf(line, line_len, " " "\n", spindle_steps * 1.2, center_x, center_y, center_x, center_y, graph_width_extra / 2); write(plot->fd, line, strlen(line)); snprintf(line, line_len, "\n\n", axis_x_off_double(graph_width_extra), center_y, 4.5); write(plot->fd, line, strlen(line)); spindle_steps += 0.01; radius = floor(radius / 2); num_circles = radius / 4 - 3; cells_per_circle = pph->history_max / num_circles; degrees_per_cell = 360 / cells_per_circle; for (i = 0; i < pph->num_used; i++) { cell_index = pph->history[i]; circle_num = floor(cell_index / cells_per_circle); rot = cell_index - circle_num * cells_per_circle; circle_num = num_circles - circle_num; radius = circle_num * 4; rot = rot * degrees_per_cell; rot -= spindle_steps; snprintf(line, line_len, "\n", -rot, center_x, center_y, axis_x_off_double(graph_width_extra / 2 + radius) + 8, center_y, radius, radius, pph->color); write(plot->fd, line, strlen(line)); } return 0; } static int add_plot_history(struct pid_plot_history *pph, double val) { if (pph->num_used == pph->history_len) { pph->history_len += 4096; pph->history = realloc(pph->history, pph->history_len * sizeof(double)); if (!pph->history) { perror("Unable to allocate memory"); exit(1); } } pph->history[pph->num_used++] = val; return 0; } int svg_io_graph_movie(struct graph_dot_data *gdd, struct pid_plot_history *pph, int col) { int row = 0; int arr_index; unsigned char val; int bit_index; int bit_mod; double blocks_per_row = (gdd->max_offset - gdd->min_offset + 1) / gdd->rows; double movie_blocks_per_cell = (gdd->max_offset - gdd->min_offset + 1) / (graph_width * graph_height); double cell_index; int margin_orig = graph_inner_y_margin; graph_inner_y_margin += 5; pph->history_max = (gdd->max_offset - gdd->min_offset + 1) / movie_blocks_per_cell; for (row = gdd->rows - 1; row >= 0; row--) { bit_index = row * gdd->cols + col; arr_index = bit_index / 8; bit_mod = bit_index % 8; if (arr_index < 0) continue; val = gdd->data[arr_index]; if (val & (1 << bit_mod)) { /* in bytes, linear offset from the start of the drive */ cell_index = (double)row * blocks_per_row; /* a cell number in the graph */ cell_index /= movie_blocks_per_cell; add_plot_history(pph, cell_index); } } graph_inner_y_margin = margin_orig; return 0; } int svg_io_graph(struct plot *plot, struct graph_dot_data *gdd) { int fd = plot->fd;; int col = 0; int row = 0; int arr_index; unsigned char val; int bit_index; int bit_mod; for (row = gdd->rows - 1; row >= 0; row--) { for (col = 0; col < gdd->cols; col++) { bit_index = row * gdd->cols + col; arr_index = bit_index / 8; bit_mod = bit_index % 8; if (arr_index < 0) continue; val = gdd->data[arr_index]; if (val & (1 << bit_mod)) svg_add_io(fd, floor(row / io_graph_scale), col, 1.5, 1.5, gdd->color); } } return 0; } void svg_alloc_legend(struct plot *plot, int num_lines) { char **lines = calloc(num_lines, sizeof(char *)); plot->legend_index = 0; plot->legend_lines = lines; plot->num_legend_lines = num_lines; } void svg_free_legend(struct plot *plot) { int i; for (i = 0; i < plot->legend_index; i++) free(plot->legend_lines[i]); free(plot->legend_lines); plot->legend_lines = NULL; plot->legend_index = 0; } void svg_write_legend(struct plot *plot) { int legend_line_x = axis_x_off(graph_width) + legend_x_off; int legend_line_y = axis_y_off(graph_height) + legend_y_off; int i; if (plot->legend_index == 0) return; snprintf(line, line_len, "\n", legend_line_x - 15, legend_line_y - 12, legend_width, plot->legend_index * legend_font_size + legend_font_size / 2 + 12); write(plot->fd, line, strlen(line)); for (i = 0; i < plot->legend_index; i++) { write(plot->fd, plot->legend_lines[i], strlen(plot->legend_lines[i])); free(plot->legend_lines[i]); } free(plot->legend_lines); plot->legend_lines = NULL; plot->legend_index = 0; } void svg_add_legend(struct plot *plot, char *text, char *extra, char *color) { int legend_line_x = axis_x_off(graph_width) + legend_x_off; int legend_line_y = axis_y_off(graph_height) + legend_y_off; if (!text && (!extra || strlen(extra) == 0)) return; legend_line_y += plot->legend_index * legend_font_size + legend_font_size / 2; snprintf(line, line_len, " " "%s%s\n", legend_line_x, legend_line_y, color, legend_line_x + 13, legend_line_y + 4, font_family, legend_font_size, text, extra); plot->legend_lines[plot->legend_index++] = strdup(line); } void set_legend_width(int longest_str) { if (longest_str) legend_width = longest_str * (legend_font_size * 3 / 4) + 25; else legend_width = 0; } void set_rolling_avg(int rolling) { rolling_avg_secs = rolling; } void set_io_graph_scale(int scale) { io_graph_scale = scale; } void set_graph_size(int width, int height) { graph_width = width; graph_height = height; } void get_graph_size(int *width, int *height) { *width = graph_width; *height = graph_height; } void set_graph_height(int h) { graph_height = h; } void set_graph_width(int w) { graph_width = w; }