/* The name of this data set. */
char *name;
+ /* The style for rendering (line, bar, etc.) */
+ acre_style_t style;
+
/* Minimum and mximum extents of data. */
acre_data_point_2d_t min;
acre_data_point_2d_t max;
acre->data[acre->num_data] = data;
+ /* For timeline datasets, the X and Y ranges need to be
+ * adjusted. The desired X range is the min/max of the X and Y
+ * ranges, and the desired Y range has a size of 1.0 (centered
+ * around the dataset's index) */
+ if (data->style == ACRE_STYLE_TIMELINE) {
+ if (data->min.y < data->min.x)
+ data->min.x = data->min.y;
+ if (data->max.y > data->max.x)
+ data->max.x = data->max.y;
+
+ data->min.y = acre->num_data -0.5;
+ data->max.y = acre->num_data + 0.5;
+ }
+
if (acre->num_data == 0) {
acre->x_axis.data_min = data->min.x;
acre->y_axis.data_min = data->min.y;
if (text == NULL)
text = "";
+ cairo_save (acre->cr);
+ cairo_identity_matrix (acre->cr);
+
layout = pango_cairo_create_layout (acre->cr);
pango_layout_set_font_description (layout, acre->font);
pango_layout_set_text (layout, text, -1);
pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);
+ cairo_restore (acre->cr);
+
return layout;
}
for (d = 0; d < acre->num_data; d++) {
data = acre->data[d];
+
+ /* Never mess with the Y range for timeline data. */
+ if (data->style == ACRE_STYLE_TIMELINE)
+ continue;
+
for (i = 0; i < data->num_points; i++) {
if (data->points[i].x >= x_min &&
data->points[i].x <= x_max)
cmsCloseProfile (srgb_profile);
}
+/* Draw the given dataset as a line. */
+static void
+_draw_data_line (acre_t *acre, acre_data_t *data)
+{
+ unsigned i;
+ cairo_t *cr = acre->cr;
+
+ cairo_save (cr);
+
+ 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_identity_matrix (cr);
+ cairo_set_line_width (cr, 1.0);
+ cairo_stroke (cr);
+
+ cairo_restore (cr);
+}
+
+#define BARS_WIDTH 0.8
+
+/* Draw the given dataset as bars. */
+static void
+_draw_data_bars (acre_t *acre, acre_data_t *data)
+{
+ unsigned i;
+ cairo_t *cr = acre->cr;
+
+ cairo_save (cr);
+
+ cairo_new_path (cr);
+
+ for (i = 0; i < data->num_points; i++) {
+ cairo_rectangle (cr,
+ data->points[i].x - BARS_WIDTH / 2.0, 0.0,
+ BARS_WIDTH, data->points[i].y);
+ }
+
+ cairo_identity_matrix (cr);
+ cairo_set_line_width (cr, 1.0);
+ cairo_stroke (cr);
+
+ cairo_restore (cr);
+}
+
+/* Draw the given dataset as bars if there is room for that.
+ *
+ * Or, if the bars would run into each other, use a line instead.
+ */
+static void
+_draw_data_bars_or_line (acre_t *acre, acre_data_t *data)
+{
+ cairo_t *cr = acre->cr;
+ double ignored, width;
+
+ /* Check device-space width available for inter-bar padding. */
+ width = 1.0 - BARS_WIDTH;
+ ignored = 0.0;
+ cairo_user_to_device_distance (cr, &width, &ignored);
+
+ /* If padding is less than two pixels, draw with a line instead. */
+ if (width < 2.0)
+ _draw_data_line (acre, data);
+ else
+ _draw_data_bars (acre, data);
+}
+
+#define TIMELINE_BAR_HEIGHT 0.6
+
+/* Draw the given dataset as a timeline. Each (X,Y) point (potentially
+ * with a name) specifies the (start,stop) of a single timeline bar.
+ *
+ * Each independent timeline dataset in the chart is given its own
+ * vertical position, as specified by 'y_position'.
+ */
+static void
+_draw_data_timeline (acre_t *acre, acre_data_t *data, int y_position)
+{
+ unsigned i;
+ cairo_t *cr = acre->cr;
+ PangoLayout *timeline_label_layout;
+ double ignored, label_offset;
+ int labels_within_bar;
+
+ cairo_save (cr);
+
+ timeline_label_layout = _create_layout (acre, "Timeline");
+ pango_layout_set_font_description (timeline_label_layout, acre->font);
+
+ ignored = 0.0;
+ label_offset = ACRE_FONT_SIZE;
+ cairo_device_to_user_distance (cr, &ignored, &label_offset);
+
+ labels_within_bar = TIMELINE_BAR_HEIGHT / fabs (label_offset);
+
+ for (i = 0; i < data->num_points; i++) {
+ cairo_rectangle (cr,
+ data->points[i].x,
+ y_position - TIMELINE_BAR_HEIGHT / 2.0,
+ data->points[i].y - data->points[i].x,
+ TIMELINE_BAR_HEIGHT);
+
+ cairo_save (cr);
+ cairo_identity_matrix (cr);
+ cairo_set_line_width (cr, 1.0);
+ cairo_stroke_preserve (cr);
+ cairo_restore (cr);
+
+ cairo_new_path (cr);
+
+ if (i <= data->num_names && data->names[i]) {
+ cairo_save (cr);
+
+ cairo_move_to (cr, data->points[i].x,
+ y_position + TIMELINE_BAR_HEIGHT / 2.0 +
+ (i % labels_within_bar) * label_offset);
+ pango_layout_set_text (timeline_label_layout, data->names[i], -1);
+ cairo_identity_matrix (cr);
+ pango_cairo_show_layout (cr, timeline_label_layout);
+
+ cairo_restore (cr);
+ } else {
+ cairo_new_path (cr);
+ }
+
+ }
+
+ _destroy_layout (timeline_label_layout);
+
+ cairo_restore (cr);
+}
+
+/* Draw all the datasets of the chart. */
static void
_draw_data (acre_t *acre)
{
cairo_t *cr = acre->cr;
- unsigned int d, i;
+ unsigned int i;
acre_data_t *data;
cairo_save (cr);
_set_transform_to_data_space (acre);
- for (d = 0; d < acre->num_data; d++) {
- int color = d % acre->num_colors;
+ for (i = 0; i < acre->num_data; i++) {
+ int color = i % acre->num_colors;
cairo_set_source_rgb (cr,
acre->colors[color].red,
acre->colors[color].green,
acre->colors[color].blue);
- data = acre->data[d];
+ data = acre->data[i];
- 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);
+ switch (data->style) {
+ case ACRE_STYLE_LINE:
+ _draw_data_line (acre, data);
+ break;
+ case ACRE_STYLE_BARS:
+ _draw_data_bars (acre, data);
+ break;
+ case ACRE_STYLE_BARS_OR_LINE:
+ _draw_data_bars_or_line (acre, data);
+ break;
+ case ACRE_STYLE_TIMELINE:
+ /* Position the timeline bars top-down */
+ _draw_data_timeline (acre, data, acre->num_data - 1 - i);
+ break;
}
- cairo_restore (cr);
}
cairo_restore (cr);
{
PangoLayout *layout;
int width, height;
+ double label_value;
cairo_save (cr);
- layout = _create_layout_printf (acre, "%g", t);
+ label_value = t;
+ if (fabs (label_value) < (sub_step / 1000.))
+ label_value = 0.0;
+ layout = _create_layout_printf (acre, "%g", label_value);
if (ticks == ACRE_TICKS_X)
cairo_move_to (cr, t, acre->y_axis.view_min);
data->name = NULL;
+ data->style = ACRE_STYLE_LINE;
+
data->points = NULL;
data->points_size = 0;
data->num_points = 0;
free (data);
}
+void
+acre_data_set_style (acre_data_t *data, acre_style_t style)
+{
+ data->style = style;
+}
+
/* Set the label for this dataset (to appear in the plot's key). */
void
acre_data_set_name (acre_data_t *data, const char *name)
projects / acre / blobdiff