static GOStyle *
sop_default_style (void)
{
GOStyle *res = go_style_new ();
res->interesting_fields = GO_STYLE_OUTLINE | GO_STYLE_FILL;
res->line.width = 0; /* hairline */
res->line.color = GO_COLOR_BLACK;
res->line.dash_type = GO_LINE_SOLID; /* anything but 0 */
res->line.join = CAIRO_LINE_JOIN_ROUND;
res->fill.type = GO_STYLE_FILL_PATTERN;
go_pattern_set_solid (&res->fill.pattern, GO_COLOR_WHITE);
return res;
}
static void
gog_pie_view_render (GogView *view, GogViewAllocation const *bbox)
{
GogPiePlot const *model = GOG_PIE_PLOT (view->model);
GogPieSeries const *series = NULL;
double separated_cx, separated_cy, cx, cy, r, theta, len, *vals, scale;
double default_sep;
unsigned elem, k;
GOPath *path;
GogTheme *theme = gog_object_get_theme (GOG_OBJECT (model));
GOStyle *style, *white_style = NULL, *elt_style = NULL;
GSList *ptr;
unsigned num_series = 0;
unsigned index;
double center_radius;
double center_size = 0.0;
double r_ext, r_int, r_tot;
double outline_width_max;
gboolean has_hole;
double separation_max, separation;
GogPieSeriesElement *gpse;
GList const *overrides;
GogShowNegsMode mode = model->show_negatives;
gboolean negative;
/* compute number of valid series */
for (ptr = model->base.series ; ptr != NULL ; ptr = ptr->next) {
series = ptr->data;
if (!gog_series_is_valid (GOG_SERIES (ptr->data)))
continue;
num_series++;
}
if (num_series <= 0)
return;
separation_max = .0;
outline_width_max = .0;
if ((style = go_styled_object_get_style (GO_STYLED_OBJECT (series))))
outline_width_max = gog_renderer_line_size (view->renderer, style->line.width);
if (mode == GOG_SHOW_NEGS_WHITE) {
white_style = go_style_dup (style);
white_style->fill.type = GO_STYLE_FILL_PATTERN;
go_pattern_set_solid (&white_style->fill.pattern, GO_COLOR_WHITE);
}
for (overrides = gog_series_get_overrides (GOG_SERIES (series));
overrides != NULL;
overrides = overrides->next) {
separation = GOG_PIE_SERIES_ELEMENT (overrides->data)->separation;
if (separation_max < separation)
separation_max = separation;
style = go_styled_object_get_style (GO_STYLED_OBJECT (overrides->data));
if (outline_width_max < style->line.width)
outline_width_max = style->line.width;
}
if (separation_max < -model->default_separation)
separation_max = -model->default_separation;
if (GOG_IS_RING_PLOT (model))
center_size = GOG_RING_PLOT(model)->center_size;
else if (num_series > 1)
num_series = 1;
/* calculate things when span < 100. */
if (model->span < 100.) {
double xmin, xmax, ymin, ymax, ratio;
double begin, cur, end;
if (num_series == 1) {
begin = (model->initial_angle + series->initial_angle) * M_PI / 180. - M_PI / 2.;
end = begin + model->span * M_PI / 50.;
} else {
/* WARNING: this code has not been checked */
ptr = model->base.series;
while (!gog_series_is_valid (GOG_SERIES (ptr->data)))
ptr = ptr->next;
series = ptr->data;
begin = end = series->initial_angle;
for (ptr = ptr->next; ptr != NULL; ptr = ptr->next) {
if (!gog_series_is_valid (GOG_SERIES (ptr->data)))
continue;
series = ptr->data;
cur = series->initial_angle;
if (cur < begin)
begin = cur;
if (cur > end)
end = cur;
}
begin = (model->initial_angle + begin) * M_PI / 180. - M_PI / 2.;
end = ((model->initial_angle + end) / 180. + model->span / 50.) * M_PI - M_PI / 2.;
}
cur = ceil (begin / M_PI * 2 - 1e-10) * M_PI / 2;
xmin = xmax = cos (begin);
ymin = ymax = sin (begin);
while (cur < end) {
cx = cos (cur);
cy = sin (cur);
if (cx > xmax)
xmax = cx;
if (cx < xmin)
xmin = cx;
if (cy > ymax)
ymax = cy;
if (cy < ymin)
ymin = cy;
cur += M_PI / 2;
}
cx = cos (end);
cy = sin (end);
if (cx > xmax)
xmax = cx;
if (cx < xmin)
xmin = cx;
if (cy > ymax)
ymax = cy;
if (cy < ymin)
ymin = cy;
/* we ensure that the center will be visible */
if (xmin > 0.)
xmin = 0.;
if (xmax < 0.)
xmax = 0.;
if (ymin > 0.)
ymin = 0.;
if (ymax < 0.)
ymax = 0.;
ratio = (ymax - ymin) / (xmax - xmin);
if (view->allocation.h > view->allocation.w * ratio) {
r_tot = view->allocation.w * MAX (xmax, -xmin) / (xmax - xmin);
cx = view->allocation.x - view->allocation.w * xmin / (xmax - xmin);
cy = view->allocation.y +
(view->allocation.h + view->allocation.w * ratio) / 2.
- view->allocation.w * ratio * ymax / (ymax - ymin);
} else {
r_tot = view->allocation.h * MAX (ymax, -ymin) / (ymax - ymin);
cx = view->allocation.x +
(view->allocation.w - view->allocation.h / ratio) / 2.
- view->allocation.h / ratio * xmin / (xmax - xmin);
cy = view->allocation.y - view->allocation.h * ymin / (ymax - ymin);
}
r_tot /= 1. + model->default_separation + separation_max;
} else {
/* centre things */
cx = view->allocation.x + view->allocation.w/2.;
cy = view->allocation.y + view->allocation.h/2.;
r_tot = view->allocation.h;
if (r_tot > view->allocation.w)
r_tot = view->allocation.w;
r_tot /= 2. * (1. + model->default_separation + separation_max);
}
path = go_path_new ();
default_sep = r_tot * model->default_separation;
center_radius = r_tot * center_size;
r = r_tot * (1. - center_size);
elem = model->base.index_num;
index = 1;
for (ptr = model->base.series ; ptr != NULL ; ptr = ptr->next) {
series = ptr->data;
if (!gog_series_is_valid (GOG_SERIES (series)))
continue;
if (index > num_series) /* people snuck extra series into a pie */
break;
if (num_series == index)
r -= outline_width_max / 2.0;
has_hole = center_radius > 0. || index > 1;
r_int = center_radius + r * ((double)index - 1.0) / (double)num_series;
r_ext = center_radius + r * (double)index / (double)num_series;
theta = (model->initial_angle + series->initial_angle) * M_PI / 180. - M_PI / 2.;
scale = 2 * M_PI / 100 * model->span / series->total;
vals = go_data_get_values (series->base.values[1].data);
style = GOG_STYLED_OBJECT (series)->style;
if (model->base.vary_style_by_element || mode == GOG_SHOW_NEGS_WHITE)
style = go_style_dup (style);
gog_renderer_push_style (view->renderer, style);
overrides = gog_series_get_overrides (GOG_SERIES (series));
for (k = 0 ; k < series->base.num_elements; k++) {
len = vals[k] * scale;
negative = len < 0;
if (negative) {
if (mode == GOG_SHOW_NEGS_SKIP) {
if ((overrides != NULL) &&
(GOG_SERIES_ELEMENT (overrides->data)->index == k))
overrides = overrides->next;
continue;
}
len = -len;
}
if (!go_finite (len) || len < 1e-3) {
if ((overrides != NULL) &&
(GOG_SERIES_ELEMENT (overrides->data)->index == k))
overrides = overrides->next;
continue;
}
gpse = NULL;
if ((overrides != NULL) &&
(GOG_SERIES_ELEMENT (overrides->data)->index == k)) {
gpse = GOG_PIE_SERIES_ELEMENT (overrides->data);
overrides = overrides->next;
if (negative && mode == GOG_SHOW_NEGS_WHITE) {
elt_style = go_style_dup (go_styled_object_get_style (
GO_STYLED_OBJECT (gpse)));
elt_style->fill.type = GO_STYLE_FILL_PATTERN;
go_pattern_set_solid (&elt_style->fill.pattern, GO_COLOR_WHITE);
gog_renderer_push_style (view->renderer, elt_style);
} else
gog_renderer_push_style (view->renderer,
go_styled_object_get_style (
GO_STYLED_OBJECT (gpse)));
} else {
if (negative && mode == GOG_SHOW_NEGS_WHITE)
gog_renderer_push_style (view->renderer, white_style);
else if (model->base.vary_style_by_element)
gog_theme_fillin_style (theme, style, GOG_OBJECT (series),
model->base.index_num + k, GO_STYLE_FILL);
}
/* only separate the outer ring */
separated_cx = cx;
separated_cy = cy;
if (num_series == index && (default_sep > 0. || gpse != NULL)) {
separation = default_sep;
if (gpse != NULL)
separation += gpse->separation * r_tot;
separated_cx += separation * cos (theta + len/2.);
separated_cy += separation * sin (theta + len/2.);
}
theta += len;
go_path_ring_wedge (path, separated_cx, separated_cy,
r_ext, r_ext,
has_hole ? r_int : 0.0,
has_hole ? r_int : 0.0,
theta - len,
theta);
gog_renderer_draw_shape (view->renderer, path);
go_path_clear (path);
if (gpse != NULL || (negative && mode == GOG_SHOW_NEGS_WHITE)) {
gog_renderer_pop_style (view->renderer);
if (elt_style) {
g_object_unref (elt_style);
elt_style = NULL;
}
}
}
gog_renderer_pop_style (view->renderer);
if (model->base.vary_style_by_element || mode == GOG_SHOW_NEGS_WHITE)
g_object_unref (style);
if (white_style)
g_object_unref (white_style);
index ++;
}
go_path_free (path);
}
