static void
gwy_vruler_real_draw_ticks(GwyRuler *ruler,
gint pixelsize,
gint min_label_spacing,
gint min_tick_spacing)
{
gdouble lower, upper, max;
gint text_size, labels, i, scale_depth;
gdouble range, measure, base, step, first;
GwyScaleScale scale;
GwySIValueFormat *format;
PangoLayout *layout;
PangoRectangle rect;
gchar *unit_str;
gint unitstr_len, j;
gint width, tick_length, xthickness, ythickness;
gboolean units_drawn;
GtkWidget *widget;
GdkGC *gc;
gint digit_width, digit_xoffset;
const gchar *utf8p, *utf8next;
gint ascent, descent, ypos;
struct { GwyScaleScale scale; double base; } tick_info[4];
widget = GTK_WIDGET(ruler);
xthickness = widget->style->xthickness;
ythickness = widget->style->ythickness;
format = ruler->vformat;
upper = ruler->upper;
lower = ruler->lower;
if (upper <= lower || pixelsize < 2 || pixelsize > 10000)
return;
max = ruler->max_size;
if (max == 0)
max = MAX(fabs(lower), fabs(upper));
range = upper - lower;
measure = range/format->magnitude / pixelsize;
max /= format->magnitude;
switch (ruler->units_placement && ruler->units) {
case GWY_UNITS_PLACEMENT_AT_ZERO:
unit_str
= g_strdup_printf("%d %s",
(lower > 0) ? (gint)(lower/format->magnitude) : 0,
format->units);
break;
default:
unit_str = g_strdup_printf("%d", (gint)max);
break;
}
layout = gtk_widget_create_pango_layout(widget, "012456789");
pango_layout_get_extents(layout, NULL, &rect);
digit_width = PANGO_PIXELS(rect.width)/10 + 1;
digit_xoffset = rect.x;
pango_layout_set_markup(layout, unit_str, -1);
pango_layout_get_extents(layout, &rect, NULL);
ascent = PANGO_ASCENT(rect);
descent = PANGO_DESCENT(rect);
text_size = g_utf8_strlen(pango_layout_get_text(layout), -1);
text_size = PANGO_PIXELS(ascent + descent)*text_size;
/* reallocate unit_str with some margin */
unitstr_len = strlen(unit_str) + 16;
unit_str = g_renew(gchar, unit_str, unitstr_len);
/* fit as many labels as you can */
labels = floor(pixelsize/(text_size + ythickness + min_label_spacing));
labels = MAX(labels, 1);
if (labels > 6)
labels = 6 + (labels - 5)/2;
step = range/format->magnitude / labels;
base = compute_base(step, 10);
step /= base;
if (step >= 5.0 || base < 1.0) {
scale = GWY_SCALE_1;
base *= 10;
}
else if (step >= 2.5)
scale = GWY_SCALE_5;
else if (step >= 2.0)
scale = GWY_SCALE_2_5;
else
scale = GWY_SCALE_2;
step = steps[scale];
/* draw labels */
width = widget->allocation.width - 2*xthickness;
units_drawn = FALSE;
first = floor(lower/format->magnitude / (base*step))*base*step;
for (i = 0; ; i++) {
gint pos;
gdouble val;
val = i*step*base + first;
pos = floor((val - lower/format->magnitude)/measure);
if (pos >= pixelsize)
break;
if (pos < 0)
continue;
if (!units_drawn
&& (upper < 0 || val >= 0)
&& ruler->units_placement == GWY_UNITS_PLACEMENT_AT_ZERO
&& ruler->units) {
g_snprintf(unit_str, unitstr_len, "%d %s",
ROUND(val), format->units);
units_drawn = TRUE;
}
else
g_snprintf(unit_str, unitstr_len, "%d", ROUND(val));
pango_layout_set_markup(layout, unit_str, -1);
utf8p = unit_str;
utf8next = g_utf8_next_char(utf8p);
j = 0;
ypos = pos + ythickness + 1;
while (*utf8p) {
pango_layout_set_text(layout, utf8p, utf8next - utf8p);
pango_layout_get_extents(layout, &rect, NULL);
gtk_paint_layout(widget->style,
ruler->backing_store,
GTK_WIDGET_STATE(widget),
FALSE,
NULL,
widget,
"vruler",
xthickness + 1 + PANGO_PIXELS(digit_xoffset),
ypos,
layout);
utf8p = utf8next;
utf8next = g_utf8_next_char(utf8p);
ypos += PANGO_PIXELS(PANGO_ASCENT(rect) + PANGO_DESCENT(rect)) + 2;
j++;
}
}
/* draw tick marks, from smallest to largest */
scale_depth = 0;
while (scale && scale_depth < (gint)G_N_ELEMENTS(tick_info)) {
tick_info[scale_depth].scale = scale;
tick_info[scale_depth].base = base;
scale = next_scale(scale, &base, measure, min_tick_spacing);
scale_depth++;
}
scale_depth--;
gc = widget->style->fg_gc[GTK_STATE_NORMAL];
while (scale_depth > -1) {
tick_length = width/(scale_depth + 1) - 2;
scale = tick_info[scale_depth].scale;
base = tick_info[scale_depth].base;
step = steps[scale];
first = floor(lower/format->magnitude / (base*step))*base*step;
for (i = 0; ; i++) {
gint pos;
gdouble val;
val = (i + 0.000001)*step*base + first;
pos = floor((val - lower/format->magnitude)/measure);
if (pos >= pixelsize)
break;
if (pos < 0)
continue;
gdk_draw_line(ruler->backing_store, gc,
width + xthickness - tick_length, pos,
width + xthickness, pos);
}
scale_depth--;
}
g_free(unit_str);
g_object_unref(layout);
}
IMPCORE_BEGIN_INTERNAL_NAMESPACE
Referential::Referential(Model* m, ParticleIndex pi)
: m_(m), pi_(pi), centroid_(compute_centroid()), base_(compute_base()),
q_(compute_quaternion()) {}
