95d04bc418f7ed51586db7256c901173faae1571
1 /****************************************************************************
2 * RRDtool 1.3rc8 Copyright by Tobi Oetiker, 1997-2008
3 ****************************************************************************
4 * rrd_gfx.c graphics wrapper for rrdtool
5 **************************************************************************/
7 /* #define DEBUG */
9 /* stupid MSVC doesnt support variadic macros = no debug for now! */
10 #ifdef _MSC_VER
11 # define RRDPRINTF()
12 #else
13 # ifdef DEBUG
14 # define RRDPRINTF(...) fprintf(stderr, __VA_ARGS__);
15 # else
16 # define RRDPRINTF(...)
17 # endif /* DEBUG */
18 #endif /* _MSC_VER */
20 #include "rrd_tool.h"
21 #include "rrd_graph.h"
24 /* create a new line */
25 void gfx_line(
26 image_desc_t *im,
27 double X0,
28 double Y0,
29 double X1,
30 double Y1,
31 double width,
32 gfx_color_t color)
33 {
34 gfx_dashed_line(im, X0, Y0, X1, Y1, width, color, 0, 0);
35 }
37 void gfx_dashed_line(
38 image_desc_t *im,
39 double X0,
40 double Y0,
41 double X1,
42 double Y1,
43 double width,
44 gfx_color_t color,
45 double dash_on,
46 double dash_off)
47 {
48 cairo_t *cr = im->cr;
49 double dashes[] = { dash_on, dash_off };
50 double x = 0;
51 double y = 0;
53 cairo_save(cr);
54 cairo_new_path(cr);
55 cairo_set_line_width(cr, width);
56 gfx_line_fit(im, &x, &y);
57 gfx_line_fit(im, &X0, &Y0);
58 cairo_move_to(cr, X0, Y0);
59 gfx_line_fit(im, &X1, &Y1);
60 cairo_line_to(cr, X1, Y1);
61 if (dash_on > 0 || dash_off > 0)
62 cairo_set_dash(cr, dashes, 2, x);
63 cairo_set_source_rgba(cr, color.red, color.green, color.blue,
64 color.alpha);
65 cairo_stroke(cr);
66 cairo_restore(cr);
67 }
69 /* create a new area */
70 void gfx_new_area(
71 image_desc_t *im,
72 double X0,
73 double Y0,
74 double X1,
75 double Y1,
76 double X2,
77 double Y2,
78 gfx_color_t color)
79 {
80 cairo_t *cr = im->cr;
82 cairo_new_path(cr);
83 gfx_area_fit(im, &X0, &Y0);
84 cairo_move_to(cr, X0, Y0);
85 gfx_area_fit(im, &X1, &Y1);
86 cairo_line_to(cr, X1, Y1);
87 gfx_area_fit(im, &X2, &Y2);
88 cairo_line_to(cr, X2, Y2);
89 cairo_set_source_rgba(cr, color.red, color.green, color.blue,
90 color.alpha);
91 }
93 /* add a point to a line or to an area */
94 void gfx_add_point(
95 image_desc_t *im,
96 double x,
97 double y)
98 {
99 cairo_t *cr = im->cr;
101 gfx_area_fit(im, &x, &y);
102 cairo_line_to(cr, x, y);
103 }
105 void gfx_close_path(
106 image_desc_t *im)
107 {
108 cairo_t *cr = im->cr;
110 cairo_close_path(cr);
111 cairo_fill(cr);
112 }
114 /* create a text node */
115 static PangoLayout *gfx_prep_text(
116 image_desc_t *im,
117 double x,
118 gfx_color_t color,
119 char *font,
120 double size,
121 double tabwidth,
122 const char *text)
123 {
124 PangoLayout *layout;
125 PangoFontDescription *font_desc;
126 cairo_t *cr = im->cr;
128 /* for performance reasons we might
129 want todo that only once ... tabs will always
130 be the same */
131 long i;
132 long tab_count = strlen(text);
133 long tab_shift = fmod(x, tabwidth);
134 int border = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
136 PangoTabArray *tab_array;
137 PangoContext *pango_context;
139 tab_array = pango_tab_array_new(tab_count, (gboolean) (1));
140 for (i = 1; i <= tab_count; i++) {
141 pango_tab_array_set_tab(tab_array,
142 i, PANGO_TAB_LEFT,
143 tabwidth * i - tab_shift + border);
144 }
145 cairo_new_path(cr);
146 cairo_set_source_rgba(cr, color.red, color.green, color.blue,
147 color.alpha);
148 layout = pango_cairo_create_layout(cr);
149 pango_context = pango_layout_get_context(layout);
150 pango_cairo_context_set_font_options(pango_context, im->font_options);
151 pango_cairo_context_set_resolution(pango_context, 100);
153 /* pango_cairo_update_context(cr, pango_context); */
155 pango_layout_set_tabs(layout, tab_array);
156 font_desc = pango_font_description_from_string(font);
157 pango_font_description_set_size(font_desc, size * PANGO_SCALE);
158 pango_layout_set_font_description(layout, font_desc);
159 if (im->with_markup)
160 pango_layout_set_markup(layout, text, -1);
161 return layout;
162 }
164 /* Size Text Node */
165 double gfx_get_text_width(
166 image_desc_t *im,
167 double start,
168 char *font,
169 double size,
170 double tabwidth,
171 char *text)
172 {
173 PangoLayout *layout;
174 PangoRectangle log_rect;
175 gfx_color_t color = { 0, 0, 0, 0 };
176 layout = gfx_prep_text(im, start, color, font, size, tabwidth, text);
177 pango_layout_get_pixel_extents(layout, NULL, &log_rect);
178 pango_tab_array_free(pango_layout_get_tabs(layout));
179 g_object_unref(layout);
180 return log_rect.width;
181 }
183 void gfx_text(
184 image_desc_t *im,
185 double x,
186 double y,
187 gfx_color_t color,
188 char *font,
189 double size,
190 double tabwidth,
191 double angle,
192 enum gfx_h_align_en h_align,
193 enum gfx_v_align_en v_align,
194 const char *text)
195 {
196 PangoLayout *layout;
197 PangoRectangle log_rect;
198 PangoRectangle ink_rect;
199 cairo_t *cr = im->cr;
200 double sx = 0;
201 double sy = 0;
203 cairo_save(cr);
204 cairo_translate(cr, x, y);
205 /* gfx_line(cr,-2,0,2,0,1,color);
206 gfx_line(cr,0,-2,0,2,1,color); */
207 layout = gfx_prep_text(im, x, color, font, size, tabwidth, text);
208 pango_layout_get_pixel_extents(layout, &ink_rect, &log_rect);
209 cairo_rotate(cr, -angle * G_PI / 180.0);
210 sx = log_rect.x;
211 switch (h_align) {
212 case GFX_H_RIGHT:
213 sx -= log_rect.width;
214 break;
215 case GFX_H_CENTER:
216 sx -= log_rect.width / 2;
217 break;
218 case GFX_H_LEFT:
219 break;
220 case GFX_H_NULL:
221 break;
222 }
223 sy = log_rect.y;
224 switch (v_align) {
225 case GFX_V_TOP:
226 break;
227 case GFX_V_CENTER:
228 sy -= log_rect.height / 2;
229 break;
230 case GFX_V_BOTTOM:
231 sy -= log_rect.height;
232 break;
233 case GFX_V_NULL:
234 break;
235 }
236 pango_cairo_update_layout(cr, layout);
237 cairo_move_to(cr, sx, sy);
238 pango_cairo_show_layout(cr, layout);
239 pango_tab_array_free(pango_layout_get_tabs(layout));
240 g_object_unref(layout);
241 cairo_restore(cr);
243 }
245 /* convert color */
246 struct gfx_color_t gfx_hex_to_col(
247 long unsigned int color)
248 {
249 struct gfx_color_t gfx_color;
251 gfx_color.red = 1.0 / 255.0 * ((color & 0xff000000) >> (3 * 8));
252 gfx_color.green = 1.0 / 255.0 * ((color & 0x00ff0000) >> (2 * 8));
253 gfx_color.blue = 1.0 / 255.0 * ((color & 0x0000ff00) >> (1 * 8));
254 gfx_color.alpha = 1.0 / 255.0 * (color & 0x000000ff);
255 return gfx_color;
256 }
258 /* gridfit_lines */
260 void gfx_line_fit(
261 image_desc_t *im,
262 double *x,
263 double *y)
264 {
265 cairo_t *cr = im->cr;
266 double line_width;
267 double line_height;
269 if (!im->gridfit)
270 return;
271 cairo_user_to_device(cr, x, y);
272 line_width = cairo_get_line_width(cr);
273 line_height = line_width;
274 cairo_user_to_device_distance(cr, &line_width, &line_height);
275 line_width = line_width / 2.0 - (long) (line_width / 2.0);
276 line_height = line_height / 2.0 - (long) (line_height / 2.0);
277 *x = (double) ((long) (*x + 0.5)) - line_width;
278 *y = (double) ((long) (*y + 0.5)) + line_height;
279 cairo_device_to_user(cr, x, y);
280 }
282 /* gridfit_areas */
284 void gfx_area_fit(
285 image_desc_t *im,
286 double *x,
287 double *y)
288 {
289 cairo_t *cr = im->cr;
291 if (!im->gridfit)
292 return;
293 cairo_user_to_device(cr, x, y);
294 *x = (double) ((long) (*x + 0.5));
295 *y = (double) ((long) (*y + 0.5));
296 cairo_device_to_user(cr, x, y);
297 }