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/****************************************************************************
* RRDtool 1.4.3 Copyright by Tobi Oetiker, 1997-2010
****************************************************************************
* rrd_gfx.c graphics wrapper for rrdtool
**************************************************************************/
/* #define DEBUG */
/* stupid MSVC doesnt support variadic macros = no debug for now! */
#ifdef _MSC_VER
# define RRDPRINTF()
#else
# ifdef DEBUG
# define RRDPRINTF(...) fprintf(stderr, __VA_ARGS__);
# else
# define RRDPRINTF(...)
# endif /* DEBUG */
#endif /* _MSC_VER */
#include "rrd_tool.h"
#include "rrd_graph.h"
/* create a new line */
void gfx_line(
image_desc_t *im,
double X0,
double Y0,
double X1,
double Y1,
double width,
gfx_color_t color)
{
gfx_dashed_line(im, X0, Y0, X1, Y1, width, color, 0, 0);
}
void gfx_dashed_line(
image_desc_t *im,
double X0,
double Y0,
double X1,
double Y1,
double width,
gfx_color_t color,
double dash_on,
double dash_off)
{
cairo_t *cr = im->cr;
double dashes[2];
double x = 0;
double y = 0;
dashes[0] = dash_on;
dashes[1] = dash_off;
cairo_save(cr);
cairo_new_path(cr);
cairo_set_line_width(cr, width);
gfx_line_fit(im, &x, &y);
gfx_line_fit(im, &X0, &Y0);
cairo_move_to(cr, X0, Y0);
gfx_line_fit(im, &X1, &Y1);
cairo_line_to(cr, X1, Y1);
if (dash_on > 0 || dash_off > 0)
cairo_set_dash(cr, dashes, 2, x);
cairo_set_source_rgba(cr, color.red, color.green, color.blue,
color.alpha);
cairo_stroke(cr);
cairo_restore(cr);
}
/* create a new area */
void gfx_new_area(
image_desc_t *im,
double X0,
double Y0,
double X1,
double Y1,
double X2,
double Y2,
gfx_color_t color)
{
cairo_t *cr = im->cr;
cairo_new_path(cr);
gfx_area_fit(im, &X0, &Y0);
cairo_move_to(cr, X0, Y0);
gfx_area_fit(im, &X1, &Y1);
cairo_line_to(cr, X1, Y1);
gfx_area_fit(im, &X2, &Y2);
cairo_line_to(cr, X2, Y2);
cairo_set_source_rgba(cr, color.red, color.green, color.blue,
color.alpha);
}
/* add a point to a line or to an area */
void gfx_add_point(
image_desc_t *im,
double x,
double y)
{
cairo_t *cr = im->cr;
gfx_area_fit(im, &x, &y);
cairo_line_to(cr, x, y);
}
void gfx_close_path(
image_desc_t *im)
{
cairo_t *cr = im->cr;
cairo_close_path(cr);
cairo_fill(cr);
}
/* create a text node */
static PangoLayout *gfx_prep_text(
image_desc_t *im,
double x,
gfx_color_t color,
PangoFontDescription *font_desc,
double tabwidth,
const char *text)
{
PangoLayout *layout = im->layout;
const PangoFontDescription *pfd;
cairo_t *cr = im->cr;
static double last_tabwidth = -1;
/* for performance reasons we might
want todo that only once ... tabs will always
be the same */
long i;
long tab_count = strlen(text);
long tab_shift = fmod(x, tabwidth);
int border = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
gchar *utf8_text;
if (last_tabwidth < 0 || last_tabwidth != tabwidth){
PangoTabArray *tab_array;
// fprintf(stderr,"t");
last_tabwidth = tabwidth;
tab_array = pango_tab_array_new(tab_count, (gboolean) (1));
for (i = 1; i <= tab_count; i++) {
pango_tab_array_set_tab(tab_array,
i, PANGO_TAB_LEFT,
tabwidth * i - tab_shift + border);
}
pango_layout_set_tabs(layout, tab_array);
pango_tab_array_free(tab_array);
}
pfd = pango_layout_get_font_description(layout);
if (!pfd || !pango_font_description_equal (pfd,font_desc)){
pango_layout_set_font_description(layout, font_desc);
}
// fprintf(stderr,"%s\n",pango_font_description_to_string(pango_layout_get_font_description(layout)));
cairo_new_path(cr);
cairo_set_source_rgba(cr, color.red, color.green, color.blue,
color.alpha);
/* layout = pango_cairo_create_layout(cr); */
// pango_cairo_context_set_font_options(pango_context, im->font_options);
// pango_cairo_context_set_resolution(pango_context, 100);
/* pango_cairo_update_context(cr, pango_context); */
/* pango expects the string to be utf-8 encoded */
utf8_text = g_locale_to_utf8((const gchar *) text, -1, NULL, NULL, NULL);
/* In case of an error, i.e. utf8_text == NULL (locale settings messed
* up?), we fall back to a possible "invalid UTF-8 string" warning instead
* of provoking a failed assertion in libpango. */
if (im->with_markup)
pango_layout_set_markup(layout, utf8_text ? utf8_text : text, -1);
else
pango_layout_set_text(layout, utf8_text ? utf8_text : text, -1);
g_free(utf8_text);
return layout;
}
/* Size Text Node */
double gfx_get_text_width(
image_desc_t *im,
double start,
PangoFontDescription *font_desc,
double tabwidth,
char *text)
{
PangoLayout *layout;
PangoRectangle log_rect;
gfx_color_t color = { 0, 0, 0, 0 };
layout = gfx_prep_text(im, start, color, font_desc, tabwidth, text);
pango_layout_get_pixel_extents(layout, NULL, &log_rect);
/* g_object_unref(layout); */
return log_rect.width;
}
void gfx_text(
image_desc_t *im,
double x,
double y,
gfx_color_t color,
PangoFontDescription *font_desc,
double tabwidth,
double angle,
enum gfx_h_align_en h_align,
enum gfx_v_align_en v_align,
const char *text)
{
PangoLayout *layout;
PangoRectangle log_rect;
cairo_t *cr = im->cr;
double sx = 0;
double sy = 0;
cairo_save(cr);
cairo_translate(cr, x, y);
/* gfx_line(cr,-2,0,2,0,1,color);
gfx_line(cr,0,-2,0,2,1,color); */
layout = gfx_prep_text(im, x, color, font_desc, tabwidth, text);
pango_layout_get_pixel_extents(layout, NULL, &log_rect);
cairo_rotate(cr, -angle * G_PI / 180.0);
sx = log_rect.x;
switch (h_align) {
case GFX_H_RIGHT:
sx -= log_rect.width;
break;
case GFX_H_CENTER:
sx -= log_rect.width / 2;
break;
case GFX_H_LEFT:
break;
case GFX_H_NULL:
break;
}
sy = log_rect.y;
switch (v_align) {
case GFX_V_TOP:
break;
case GFX_V_CENTER:
sy -= log_rect.height / 2;
break;
case GFX_V_BOTTOM:
sy -= log_rect.height;
break;
case GFX_V_NULL:
break;
}
pango_cairo_update_layout(cr, layout);
cairo_move_to(cr, sx, sy);
pango_cairo_show_layout(cr, layout);
/* g_object_unref(layout); */
cairo_restore(cr);
}
/* convert color */
struct gfx_color_t gfx_hex_to_col(
long unsigned int color)
{
struct gfx_color_t gfx_color;
gfx_color.red = 1.0 / 255.0 * ((color & 0xff000000) >> (3 * 8));
gfx_color.green = 1.0 / 255.0 * ((color & 0x00ff0000) >> (2 * 8));
gfx_color.blue = 1.0 / 255.0 * ((color & 0x0000ff00) >> (1 * 8));
gfx_color.alpha = 1.0 / 255.0 * (color & 0x000000ff);
return gfx_color;
}
/* gridfit_lines */
void gfx_line_fit(
image_desc_t *im,
double *x,
double *y)
{
cairo_t *cr = im->cr;
double line_width;
double line_height;
if (!im->gridfit)
return;
cairo_user_to_device(cr, x, y);
line_width = cairo_get_line_width(cr);
line_height = line_width;
cairo_user_to_device_distance(cr, &line_width, &line_height);
line_width = line_width / 2.0 - (long) (line_width / 2.0);
line_height = line_height / 2.0 - (long) (line_height / 2.0);
*x = (double) ((long) (*x + 0.5)) - line_width;
*y = (double) ((long) (*y + 0.5)) + line_height;
cairo_device_to_user(cr, x, y);
}
/* gridfit_areas */
void gfx_area_fit(
image_desc_t *im,
double *x,
double *y)
{
cairo_t *cr = im->cr;
if (!im->gridfit)
return;
cairo_user_to_device(cr, x, y);
*x = (double) ((long) (*x + 0.5));
*y = (double) ((long) (*y + 0.5));
cairo_device_to_user(cr, x, y);
}
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