X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=acre.c;h=8945292b3578ad530c0d653ee407da73d429a718;hb=26f1c9085c1b3eb6390cacb4870dfea8f7f3dce7;hp=8c64cadc47484c51181185aa7df7cc28e795cf7a;hpb=c6775537fa163275f3c2b46692d0c9d87e6aeb10;p=acre

diff --git a/acre.c b/acre.c
index 8c64cad..8945292 100644
--- a/acre.c
+++ b/acre.c
@@ -37,14 +37,28 @@ typedef struct _acre_data_point_2d {
 } acre_data_point_2d_t;
 
 struct _acre_data {
+    /* The name of this data set. */
     char *name;
 
+    /* Minimum and mximum extents of data. */
     acre_data_point_2d_t min;
     acre_data_point_2d_t max;
 
+    /* The data itself. */
     acre_data_point_2d_t *points;
     unsigned int points_size;
     unsigned int num_points;
+
+    /* The names of data points (if any).
+     *
+     * This array is indexed with the same index as the 'points' array
+     * to provide names for points. It is legal for this array to be
+     * NULL or smaller than 'points', (in which case, the
+     * corresponding points simply have no names).
+     */
+    char **names;
+    unsigned int names_size;
+    unsigned int num_names;
 };
 
 typedef struct _acre_axis {
@@ -134,6 +148,7 @@ acre_create (void)
     acre->font = NULL;
     acre->colors = NULL;
     acre->num_colors = 0;
+    acre->colors_size = 0;
 
     acre->width = 0;
     acre->height = 0;
@@ -347,6 +362,9 @@ _create_layout (acre_t *acre, const char *text)
 {
     PangoLayout *layout;
 
+    if (text == NULL)
+	    text = "";
+
     layout = pango_cairo_create_layout (acre->cr);
     pango_layout_set_font_description (layout, acre->font);
     pango_layout_set_text (layout, text, -1);
@@ -432,6 +450,7 @@ _draw_title_and_labels (acre_t *acre)
 
     title_layout = _create_layout (acre, acre->title);
     pango_layout_set_font_description (title_layout, title_font);
+    pango_font_description_free (title_font);
 
     x_axis_layout = _create_layout (acre, acre->x_axis.label);
     y_axis_layout = _create_layout (acre, acre->y_axis.label);
@@ -699,23 +718,6 @@ _compute_axis_ranges (acre_t *acre)
 	}
     }
 
-    /* Next, we want to ensure that the data never collides with the
-     * ticks. So we expand each axis on its minimum side as needed. */
-    cairo_save (cr);
-    {
-	double x, y;
-
-	_set_transform_to_data_space (acre);
-
-	x = ACRE_TICK_MAJOR_SIZE + 2.0;
-	y = ACRE_TICK_MAJOR_SIZE + 2.0;
-	cairo_device_to_user_distance (cr, &x, &y);
-
-	acre->x_axis.view_min -= x;
-	acre->y_axis.view_min += y;
-    }
-    cairo_restore (cr);
-
     /* Then, increase the axis ranges just enough so that the step
      * sizes for the ticks will be integers.
      */
@@ -1066,6 +1068,16 @@ acre_data_create (void)
 void
 acre_data_destroy (acre_data_t *data)
 {
+    unsigned i;
+
+    for (i = 0; i < data->num_names; i++) {
+	if (data->names[i])
+	    free (data->names[i]);
+    }
+    free (data->names);
+
+    free (data->name);
+
     free (data->points);
 
     free (data);
@@ -1116,3 +1128,27 @@ acre_data_add_point_2d (acre_data_t *data, double x, double y)
 
     data->num_points++;
 }
+
+/* Add a datapoint with a name to the given dataset. */
+void
+acre_data_add_point_2d_named (acre_data_t *data, double x, double y, const char *name)
+{
+    unsigned i;
+
+    acre_data_add_point_2d (data, x, y);
+
+    if (data->names_size < data->points_size) {
+	data->names_size = data->points_size;
+	data->names = xrealloc_ab (data->names,
+				   data->names_size,
+				   sizeof (char *));
+    }
+
+    /* Initialize any newly-created holes in the array to NULL. */
+    for (i = data->num_names; i < data->num_points - 1; i++)
+	data->names[i] = NULL;
+
+    data->num_names = data->num_points;
+
+    data->names[data->num_names - 1] = xstrdup (name);
+}