1 /*
2 * Copyright © 2013 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25 #include <stdlib.h>
26 #include <string.h>
27 #include <errno.h>
28 #include <cairo.h>
29
30 #include <stdio.h>
31
32 #include "chart.h"
33
chart_init(struct chart * chart,const char * name,int num_samples)34 int chart_init(struct chart *chart, const char *name, int num_samples)
35 {
36 memset(chart, 0, sizeof(*chart));
37 chart->name = name;
38 chart->samples = malloc(sizeof(*chart->samples)*num_samples);
39 if (chart->samples == NULL)
40 return ENOMEM;
41
42 chart->num_samples = num_samples;
43 chart->range_automatic = 1;
44 chart->stroke_width = 2;
45 chart->smooth = CHART_CURVE;
46 return 0;
47 }
48
chart_set_mode(struct chart * chart,enum chart_mode mode)49 void chart_set_mode(struct chart *chart, enum chart_mode mode)
50 {
51 chart->mode = mode;
52 }
53
chart_set_smooth(struct chart * chart,enum chart_smooth smooth)54 void chart_set_smooth(struct chart *chart, enum chart_smooth smooth)
55 {
56 chart->smooth = smooth;
57 }
58
chart_set_stroke_width(struct chart * chart,float width)59 void chart_set_stroke_width(struct chart *chart, float width)
60 {
61 chart->stroke_width = width;
62 }
63
chart_set_stroke_rgba(struct chart * chart,float red,float green,float blue,float alpha)64 void chart_set_stroke_rgba(struct chart *chart, float red, float green, float blue, float alpha)
65 {
66 chart->stroke_rgb[0] = red;
67 chart->stroke_rgb[1] = green;
68 chart->stroke_rgb[2] = blue;
69 chart->stroke_rgb[3] = alpha;
70 }
71
chart_set_fill_rgba(struct chart * chart,float red,float green,float blue,float alpha)72 void chart_set_fill_rgba(struct chart *chart, float red, float green, float blue, float alpha)
73 {
74 chart->fill_rgb[0] = red;
75 chart->fill_rgb[1] = green;
76 chart->fill_rgb[2] = blue;
77 chart->fill_rgb[3] = alpha;
78 }
79
chart_set_position(struct chart * chart,int x,int y)80 void chart_set_position(struct chart *chart, int x, int y)
81 {
82 chart->x = x;
83 chart->y = y;
84 }
85
chart_set_size(struct chart * chart,int w,int h)86 void chart_set_size(struct chart *chart, int w, int h)
87 {
88 chart->w = w;
89 chart->h = h;
90 }
91
chart_set_range(struct chart * chart,double min,double max)92 void chart_set_range(struct chart *chart, double min, double max)
93 {
94 chart->range[0] = min;
95 chart->range[1] = max;
96 chart->range_automatic = 0;
97 }
98
chart_get_range(struct chart * chart,double * range)99 void chart_get_range(struct chart *chart, double *range)
100 {
101 int n, max = chart->current_sample;
102 if (max > chart->num_samples)
103 max = chart->num_samples;
104 for (n = 0; n < max; n++) {
105 if (chart->samples[n] < range[0])
106 range[0] = chart->samples[n];
107 else if (chart->samples[n] > range[1])
108 range[1] = chart->samples[n];
109 }
110 }
111
chart_add_sample(struct chart * chart,double value)112 void chart_add_sample(struct chart *chart, double value)
113 {
114 int pos;
115
116 if (chart->num_samples == 0)
117 return;
118
119 pos = chart->current_sample++ % chart->num_samples;
120 chart->samples[pos] = value;
121 }
122
chart_update_range(struct chart * chart)123 static void chart_update_range(struct chart *chart)
124 {
125 int n, max = chart->current_sample;
126 if (max > chart->num_samples)
127 max = chart->num_samples;
128 chart->range[0] = chart->range[1] = chart->samples[0];
129 for (n = 1; n < max; n++) {
130 if (chart->samples[n] < chart->range[0])
131 chart->range[0] = chart->samples[n];
132 else if (chart->samples[n] > chart->range[1])
133 chart->range[1] = chart->samples[n];
134 }
135 if (strcmp(chart->name, "power") == 0)
136 printf ("chart_update_range [%f, %f]\n", chart->range[0], chart->range[1]);
137 }
138
value_at(struct chart * chart,int n)139 static double value_at(struct chart *chart, int n)
140 {
141 if (n < chart->current_sample - chart->num_samples)
142 n = chart->current_sample;
143 else if (n >= chart->current_sample)
144 n = chart->current_sample - 1;
145
146 n %= chart->num_samples;
147 if (n < 0)
148 n += chart->num_samples;
149
150 return chart->samples[n];
151 }
152
gradient_at(struct chart * chart,int n)153 static double gradient_at(struct chart *chart, int n)
154 {
155 double y0, y1;
156
157 y0 = value_at(chart, n-1);
158 y1 = value_at(chart, n+1);
159
160 return (y1 - y0) / 2.;
161 }
162
chart_draw(struct chart * chart,cairo_t * cr)163 void chart_draw(struct chart *chart, cairo_t *cr)
164 {
165 int i, n, max, x;
166
167 if (chart->current_sample == 0)
168 return;
169
170 if (chart->range_automatic)
171 chart_update_range(chart);
172
173 if (chart->range[1] <= chart->range[0])
174 return;
175
176 cairo_save(cr);
177
178 cairo_translate(cr, chart->x, chart->y + chart->h);
179 cairo_scale(cr,
180 chart->w / (double)(chart->num_samples-1),
181 -chart->h / (chart->range[1] - chart->range[0]));
182
183 x = 0;
184 max = chart->current_sample;
185 if (max >= chart->num_samples) {
186 max = chart->num_samples;
187 i = chart->current_sample - max;
188 } else {
189 i = 0;
190 x = chart->num_samples - max;
191 }
192 cairo_translate(cr, x, -chart->range[0]);
193
194 cairo_new_path(cr);
195 if (chart->mode != CHART_STROKE)
196 cairo_move_to(cr, 0, 0);
197 for (n = 0; n < max; n++) {
198 switch (chart->smooth) {
199 case CHART_LINE:
200 cairo_line_to(cr,
201 n, value_at(chart, i + n));
202 break;
203 case CHART_CURVE:
204 cairo_curve_to(cr,
205 n-2/3., value_at(chart, i + n -1) + gradient_at(chart, i + n - 1)/3.,
206 n-1/3., value_at(chart, i + n) - gradient_at(chart, i + n)/3.,
207 n, value_at(chart, i + n));
208 break;
209 }
210 }
211 if (chart->mode != CHART_STROKE)
212 cairo_line_to(cr, n-1, 0);
213
214 cairo_identity_matrix(cr);
215 cairo_set_line_width(cr, chart->stroke_width);
216 switch (chart->mode) {
217 case CHART_STROKE:
218 cairo_set_source_rgba(cr, chart->stroke_rgb[0], chart->stroke_rgb[1], chart->stroke_rgb[2], chart->stroke_rgb[3]);
219 cairo_stroke(cr);
220 break;
221 case CHART_FILL:
222 cairo_set_source_rgba(cr, chart->fill_rgb[0], chart->fill_rgb[1], chart->fill_rgb[2], chart->fill_rgb[3]);
223 cairo_fill(cr);
224 break;
225 case CHART_FILL_STROKE:
226 cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
227 cairo_set_source_rgba(cr, chart->fill_rgb[0], chart->fill_rgb[1], chart->fill_rgb[2], chart->fill_rgb[3]);
228 cairo_fill_preserve(cr);
229 cairo_set_antialias(cr, CAIRO_ANTIALIAS_DEFAULT);
230 cairo_set_source_rgba(cr, chart->stroke_rgb[0], chart->stroke_rgb[1], chart->stroke_rgb[2], chart->stroke_rgb[3]);
231 cairo_stroke(cr);
232 break;
233 }
234 cairo_restore(cr);
235 }
236
chart_fini(struct chart * chart)237 void chart_fini(struct chart *chart)
238 {
239 free(chart->samples);
240 }
241