32 #include "chart.h"
34 int chart_init(struct chart *chart, const char *name, int num_samples)  in chart_init()  argument
36 	memset(chart, 0, sizeof(*chart));  in chart_init()
37 	chart->name = name;  in chart_init()
38 	chart->samples = malloc(sizeof(*chart->samples)*num_samples);  in chart_init()
39 	if (chart->samples == NULL)  in chart_init()
42 	chart->num_samples = num_samples;  in chart_init()
43 	chart->range_automatic = 1;  in chart_init()
44 	chart->stroke_width = 2;  in chart_init()
45 	chart->smooth = CHART_CURVE;  in chart_init()
49 void chart_set_mode(struct chart *chart, enum chart_mode mode)  in chart_set_mode()  argument
51 	chart->mode = mode;  in chart_set_mode()
54 void chart_set_smooth(struct chart *chart, enum chart_smooth smooth)  in chart_set_smooth()  argument
56 	chart->smooth = smooth;  in chart_set_smooth()
59 void chart_set_stroke_width(struct chart *chart, float width)  in chart_set_stroke_width()  argument
61 	chart->stroke_width = width;  in chart_set_stroke_width()
64 void chart_set_stroke_rgba(struct chart *chart, float red, float green, float blue, float alpha)  in chart_set_stroke_rgba()  argument
66 	chart->stroke_rgb[0] = red;  in chart_set_stroke_rgba()
67 	chart->stroke_rgb[1] = green;  in chart_set_stroke_rgba()
68 	chart->stroke_rgb[2] = blue;  in chart_set_stroke_rgba()
69 	chart->stroke_rgb[3] = alpha;  in chart_set_stroke_rgba()
72 void chart_set_fill_rgba(struct chart *chart, float red, float green, float blue, float alpha)  in chart_set_fill_rgba()  argument
74 	chart->fill_rgb[0] = red;  in chart_set_fill_rgba()
75 	chart->fill_rgb[1] = green;  in chart_set_fill_rgba()
76 	chart->fill_rgb[2] = blue;  in chart_set_fill_rgba()
77 	chart->fill_rgb[3] = alpha;  in chart_set_fill_rgba()
80 void chart_set_position(struct chart *chart, int x, int y)  in chart_set_position()  argument
82 	chart->x = x;  in chart_set_position()
83 	chart->y = y;  in chart_set_position()
86 void chart_set_size(struct chart *chart, int w, int h)  in chart_set_size()  argument
88 	chart->w = w;  in chart_set_size()
89 	chart->h = h;  in chart_set_size()
92 void chart_set_range(struct chart *chart, double min, double max)  in chart_set_range()  argument
94 	chart->range[0] = min;  in chart_set_range()
95 	chart->range[1] = max;  in chart_set_range()
96 	chart->range_automatic = 0;  in chart_set_range()
99 void chart_get_range(struct chart *chart, double *range)  in chart_get_range()  argument
101 	int n, max = chart->current_sample;  in chart_get_range()
102 	if (max > chart->num_samples)  in chart_get_range()
103 		max = chart->num_samples;  in chart_get_range()
105 		if (chart->samples[n] < range[0])  in chart_get_range()
106 			range[0] = chart->samples[n];  in chart_get_range()
107 		else if (chart->samples[n] > range[1])  in chart_get_range()
108 			range[1] = chart->samples[n];  in chart_get_range()
112 void chart_add_sample(struct chart *chart, double value)  in chart_add_sample()  argument
116 	if (chart->num_samples == 0)  in chart_add_sample()
119 	pos = chart->current_sample++ % chart->num_samples;  in chart_add_sample()
120 	chart->samples[pos] = value;  in chart_add_sample()
123 static void chart_update_range(struct chart *chart)  in chart_update_range()  argument
125 	int n, max = chart->current_sample;  in chart_update_range()
126 	if (max > chart->num_samples)  in chart_update_range()
127 		max = chart->num_samples;  in chart_update_range()
128 	chart->range[0] = chart->range[1] = chart->samples[0];  in chart_update_range()
130 		if (chart->samples[n] < chart->range[0])  in chart_update_range()
131 			chart->range[0] = chart->samples[n];  in chart_update_range()
132 		else if (chart->samples[n] > chart->range[1])  in chart_update_range()
133 			chart->range[1] = chart->samples[n];  in chart_update_range()
135 	if (strcmp(chart->name, "power") == 0)  in chart_update_range()
136 	printf ("chart_update_range [%f, %f]\n", chart->range[0], chart->range[1]);  in chart_update_range()
139 static double value_at(struct chart *chart, int n)  in value_at()  argument
141 	if (n < chart->current_sample - chart->num_samples)  in value_at()
142 		n = chart->current_sample;  in value_at()
143 	else if (n >= chart->current_sample)  in value_at()
144 		n = chart->current_sample - 1;  in value_at()
146 	n %= chart->num_samples;  in value_at()
148 		n += chart->num_samples;  in value_at()
150 	return chart->samples[n];  in value_at()
153 static double gradient_at(struct chart *chart, int n)  in gradient_at()  argument
157 	y0 = value_at(chart, n-1);  in gradient_at()
158 	y1 = value_at(chart, n+1);  in gradient_at()
163 void chart_draw(struct chart *chart, cairo_t *cr)  in chart_draw()  argument
167 	if (chart->current_sample == 0)  in chart_draw()
170 	if (chart->range_automatic)  in chart_draw()
171 		chart_update_range(chart);  in chart_draw()
173 	if (chart->range[1] <= chart->range[0])  in chart_draw()
178 	cairo_translate(cr, chart->x, chart->y + chart->h);  in chart_draw()
180 		    chart->w / (double)(chart->num_samples-1),  in chart_draw()
181 		    -chart->h / (chart->range[1] - chart->range[0]));  in chart_draw()
184 	max = chart->current_sample;  in chart_draw()
185 	if (max >= chart->num_samples) {  in chart_draw()
186 		max = chart->num_samples;  in chart_draw()
187 		i = chart->current_sample - max;  in chart_draw()
190 		x = chart->num_samples - max;  in chart_draw()
192 	cairo_translate(cr, x, -chart->range[0]);  in chart_draw()
195 	if (chart->mode != CHART_STROKE)  in chart_draw()
198 		switch (chart->smooth) {  in chart_draw()
201 				      n, value_at(chart, i + n));  in chart_draw()
205 				       n-2/3., value_at(chart, i + n -1) + gradient_at(chart, i + n - 1)/3.,  in chart_draw()
206 				       n-1/3., value_at(chart, i + n) - gradient_at(chart, i + n)/3.,  in chart_draw()
207 				       n, value_at(chart, i + n));  in chart_draw()
211 	if (chart->mode != CHART_STROKE)  in chart_draw()
215 	cairo_set_line_width(cr, chart->stroke_width);  in chart_draw()
216 	switch (chart->mode) {  in chart_draw()
218 …cairo_set_source_rgba(cr, chart->stroke_rgb[0], chart->stroke_rgb[1], chart->stroke_rgb[2], chart-…  in chart_draw()
222 …cairo_set_source_rgba(cr, chart->fill_rgb[0], chart->fill_rgb[1], chart->fill_rgb[2], chart->fill_…  in chart_draw()
227 …cairo_set_source_rgba(cr, chart->fill_rgb[0], chart->fill_rgb[1], chart->fill_rgb[2], chart->fill_…  in chart_draw()
230 …cairo_set_source_rgba(cr, chart->stroke_rgb[0], chart->stroke_rgb[1], chart->stroke_rgb[2], chart-…  in chart_draw()
237 void chart_fini(struct chart *chart)  in chart_fini()  argument
239 	free(chart->samples);  in chart_fini()