1 /****************************************************************************
2 * RRDtool 1.3rc7 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, tabwidth * i - tab_shift+border);
143 }
144 cairo_new_path(cr);
145 cairo_set_source_rgba(cr, color.red, color.green, color.blue,
146 color.alpha);
147 layout = pango_cairo_create_layout(cr);
148 pango_context = pango_layout_get_context(layout);
149 pango_cairo_context_set_font_options(pango_context, im->font_options);
150 pango_cairo_context_set_resolution(pango_context, 100);
152 /* pango_cairo_update_context(cr, pango_context); */
154 pango_layout_set_tabs(layout, tab_array);
155 font_desc = pango_font_description_from_string(font);
156 pango_font_description_set_size(font_desc, size * PANGO_SCALE);
157 pango_layout_set_font_description(layout, font_desc);
158 pango_layout_set_markup(layout, text, -1);
159 return layout;
160 }
162 /* Size Text Node */
163 double gfx_get_text_width(
164 image_desc_t *im,
165 double start,
166 char *font,
167 double size,
168 double tabwidth,
169 char *text)
170 {
171 PangoLayout *layout;
172 PangoRectangle log_rect;
173 gfx_color_t color = { 0, 0, 0, 0 };
174 layout = gfx_prep_text(im, start, color, font, size, tabwidth, text);
175 pango_layout_get_pixel_extents(layout, NULL, &log_rect);
176 pango_tab_array_free(pango_layout_get_tabs(layout));
177 g_object_unref(layout);
178 return log_rect.width;
179 }
181 void gfx_text(
182 image_desc_t *im,
183 double x,
184 double y,
185 gfx_color_t color,
186 char *font,
187 double size,
188 double tabwidth,
189 double angle,
190 enum gfx_h_align_en h_align,
191 enum gfx_v_align_en v_align,
192 const char *text)
193 {
194 PangoLayout *layout;
195 PangoRectangle log_rect;
196 PangoRectangle ink_rect;
197 cairo_t *cr = im->cr;
198 double sx = 0;
199 double sy = 0;
201 cairo_save(cr);
202 cairo_translate(cr, x, y);
203 /* gfx_line(cr,-2,0,2,0,1,color);
204 gfx_line(cr,0,-2,0,2,1,color); */
205 layout = gfx_prep_text(im, x, color, font, size, tabwidth, text);
206 pango_layout_get_pixel_extents(layout, &ink_rect, &log_rect);
207 cairo_rotate(cr, -angle * G_PI / 180.0);
208 sx = log_rect.x;
209 switch (h_align) {
210 case GFX_H_RIGHT:
211 sx -= log_rect.width;
212 break;
213 case GFX_H_CENTER:
214 sx -= log_rect.width / 2;
215 break;
216 case GFX_H_LEFT:
217 break;
218 case GFX_H_NULL:
219 break;
220 }
221 sy = log_rect.y;
222 switch (v_align) {
223 case GFX_V_TOP:
224 break;
225 case GFX_V_CENTER:
226 sy -= log_rect.height / 2;
227 break;
228 case GFX_V_BOTTOM:
229 sy -= log_rect.height;
230 break;
231 case GFX_V_NULL:
232 break;
233 }
234 pango_cairo_update_layout(cr, layout);
235 cairo_move_to(cr, sx, sy);
236 pango_cairo_show_layout(cr, layout);
237 pango_tab_array_free(pango_layout_get_tabs(layout));
238 g_object_unref(layout);
239 cairo_restore(cr);
241 }
243 /* convert color */
244 struct gfx_color_t gfx_hex_to_col(
245 long unsigned int color)
246 {
247 struct gfx_color_t gfx_color;
249 gfx_color.red = 1.0 / 255.0 * ((color & 0xff000000) >> (3 * 8));
250 gfx_color.green = 1.0 / 255.0 * ((color & 0x00ff0000) >> (2 * 8));
251 gfx_color.blue = 1.0 / 255.0 * ((color & 0x0000ff00) >> (1 * 8));
252 gfx_color.alpha = 1.0 / 255.0 * (color & 0x000000ff);
253 return gfx_color;
254 }
256 /* gridfit_lines */
258 void gfx_line_fit(
259 image_desc_t *im,
260 double *x,
261 double *y)
262 {
263 cairo_t *cr = im->cr;
264 double line_width;
265 double line_height;
267 if (!im->gridfit)
268 return;
269 cairo_user_to_device(cr, x, y);
270 line_width = cairo_get_line_width(cr);
271 line_height = line_width;
272 cairo_user_to_device_distance(cr, &line_width, &line_height);
273 line_width = line_width / 2.0 - (long) (line_width / 2.0);
274 line_height = line_height / 2.0 - (long) (line_height / 2.0);
275 *x = (double) ((long) (*x + 0.5)) - line_width;
276 *y = (double) ((long) (*y + 0.5)) + line_height;
277 cairo_device_to_user(cr, x, y);
278 }
280 /* gridfit_areas */
282 void gfx_area_fit(
283 image_desc_t *im,
284 double *x,
285 double *y)
286 {
287 cairo_t *cr = im->cr;
289 if (!im->gridfit)
290 return;
291 cairo_user_to_device(cr, x, y);
292 *x = (double) ((long) (*x + 0.5));
293 *y = (double) ((long) (*y + 0.5));
294 cairo_device_to_user(cr, x, y);
295 }