unsigned int num_points;
};
+typedef struct _acre_axis {
+ char *label;
+ double min;
+ double max;
+} acre_axis_t;
+
struct _acre {
char *title;
- char *x_axis_label;
- char *y_axis_label;
+ acre_axis_t x_axis;
+ acre_axis_t y_axis;
acre_data_t **data;
unsigned int data_size;
acre = xmalloc (sizeof (acre_t));
acre->title = NULL;
- acre->x_axis_label = NULL;
- acre->y_axis_label = NULL;
+
+ acre->x_axis.label = NULL;
+ acre->x_axis.min = 0.0;
+ acre->x_axis.max = 0.0;
+
+ acre->y_axis.label = NULL;
+ acre->y_axis.min = 0.0;
+ acre->y_axis.max = 0.0;
acre->data = NULL;
acre->data_size = 0;
unsigned int i;
free (acre->title);
- free (acre->x_axis_label);
- free (acre->y_axis_label);
+ free (acre->x_axis.label);
+ free (acre->y_axis.label);
for (i = 0; i < acre->num_data; i++)
acre_data_destroy (acre->data[i]);
void
acre_set_x_axis_label (acre_t *acre, const char *label)
{
- free (acre->x_axis_label);
+ free (acre->x_axis.label);
- acre->x_axis_label = strdup (label);
+ acre->x_axis.label = strdup (label);
}
void
acre_set_y_axis_label (acre_t *acre, const char *label)
{
- free (acre->y_axis_label);
+ free (acre->y_axis.label);
- acre->y_axis_label = strdup (label);
+ acre->y_axis.label = strdup (label);
}
/* Add a dataset to the plot. The plot assumes ownership of the
x_axis_layout = pango_cairo_create_layout (cr);
pango_layout_set_font_description (x_axis_layout, acre_font);
- pango_layout_set_text (x_axis_layout, acre->x_axis_label, -1);
+ pango_layout_set_text (x_axis_layout, acre->x_axis.label, -1);
pango_layout_set_alignment (x_axis_layout, PANGO_ALIGN_CENTER);
y_axis_layout = pango_cairo_create_layout (cr);
pango_layout_set_font_description (y_axis_layout, acre_font);
- pango_layout_set_text (y_axis_layout, acre->y_axis_label, -1);
+ pango_layout_set_text (y_axis_layout, acre->y_axis.label, -1);
pango_layout_set_alignment (y_axis_layout, PANGO_ALIGN_CENTER);
/* Iterate with the layout of the title and axis labels until they
cairo_restore (cr);
}
+static void
+_compute_axis_ranges (acre_t *acre)
+{
+ unsigned int d, i;
+ acre_data_t *data;
+
+ for (d = 0; d < acre->num_data; d++) {
+ data = acre->data[d];
+ for (i = 0; i < data->num_points; i++) {
+ if (data->points[i].x < acre->x_axis.min)
+ acre->x_axis.min = data->points[i].x;
+ if (data->points[i].x > acre->x_axis.max)
+ acre->x_axis.max = data->points[i].x;
+
+ if (data->points[i].y < acre->y_axis.min)
+ acre->y_axis.min = data->points[i].y;
+ if (data->points[i].y > acre->y_axis.max)
+ acre->y_axis.max = data->points[i].y;
+ }
+ }
+}
+
+static void
+_draw_data (acre_t *acre)
+{
+ cairo_t *cr = acre->cr;
+ unsigned int d, i;
+ acre_data_t *data;
+
+ cairo_save (cr);
+
+ cairo_set_source_rgb (cr, 0, 0, 0);
+
+ cairo_translate (cr,
+ acre->chart.x + 0.5,
+ acre->chart.y + acre->chart.height - 0.5);
+ cairo_scale (cr,
+ acre->chart.width / (acre->x_axis.max - acre->x_axis.min),
+ - acre->chart.height /(acre->y_axis.max - acre->y_axis.min));
+ cairo_translate (cr, -acre->x_axis.min, -acre->y_axis.min);
+
+ for (d = 0; d < acre->num_data; d++) {
+ data = acre->data[d];
+ cairo_new_path (cr);
+ for (i = 0; i < data->num_points; i++) {
+ cairo_line_to (cr,
+ data->points[i].x,
+ data->points[i].y);
+ }
+ cairo_save (cr);
+ {
+ cairo_identity_matrix (cr);
+ cairo_set_line_width (cr, 1.0);
+ cairo_stroke (cr);
+ }
+ cairo_restore (cr);
+ }
+
+ cairo_restore (cr);
+}
+
static void
_draw_frame_and_ticks (acre_t *acre)
{
_draw_title_and_labels (acre);
+ _compute_axis_ranges (acre);
+
+ _draw_data (acre);
+
_draw_frame_and_ticks (acre);
}