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#include <pango/pango.h>
#include <pango/pangocairo.h>
int
main (int argc, char *argv[])
{
const char *filename;
PangoContext *context;
PangoLineBreaker *breaker;
int x, y, width;
PangoLines *lines;
int inc, m, w, w2;
cairo_surface_t *surface;
cairo_t *cr;
char *text;
gsize length;
GError *error = NULL;
if (argc != 3)
{
g_printerr ("Usage: %s INPUT_FILENAME OUTPUT_FILENAME\n", argv[0]);
return 1;
}
if (!g_file_get_contents (argv[1], &text, &length, &error))
{
g_printerr ("%s\n", error->message);
return 1;
}
filename = argv[2];
context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 400, 600);
cr = cairo_create (surface);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
breaker = pango_line_breaker_new (context);
g_print ("Using %s\n", G_OBJECT_TYPE_NAME (breaker));
pango_line_breaker_add_text (breaker, text, -1, NULL);
lines = pango_lines_new ();
m = 200;
w = 10;
w2 = -200;
inc = 40;
y = 40 * PANGO_SCALE;
x = (m - w / 2) * PANGO_SCALE;
width = w * PANGO_SCALE;
while (pango_line_breaker_has_line (breaker))
{
PangoLayoutLine *line;
PangoRectangle ext;
gboolean ltr;
line = pango_line_breaker_next_line (breaker,
x, width,
PANGO_WRAP_CHAR,
PANGO_ELLIPSIZE_NONE);
pango_layout_line_get_extents (line, NULL, &ext);
line = pango_layout_line_justify (line, width);
pango_lines_add_line (lines, line, x, y - ext.y);
ltr = pango_line_breaker_get_direction (breaker) == PANGO_DIRECTION_LTR;
if (w2 > 0 && ltr && x <= m * PANGO_SCALE)
x = (m + w2 / 2) * PANGO_SCALE;
else if (w2 > 0 && !ltr && x > m * PANGO_SCALE)
x = (m - w2 / 2) * PANGO_SCALE;
else
{
y += ext.height;
w += inc;
w2 += inc;
if (w + inc >= 340 || w + inc < 0)
inc = - inc;
if (w2 > 0)
width = ((w - w2) / 2) * PANGO_SCALE;
else
width = w * PANGO_SCALE;
if (ltr)
x = (m - w / 2) * PANGO_SCALE;
else
x = (m + w / 2) * PANGO_SCALE;
}
}
for (int i = 0; i < pango_lines_get_line_count (lines); i++)
{
PangoLayoutLine *line = pango_lines_get_line (lines, i, &x, &y);
cairo_save (cr);
cairo_move_to (cr, x / (double)PANGO_SCALE, y / (double)PANGO_SCALE);
pango_cairo_show_layout_line (cr, line);
cairo_restore (cr);
}
cairo_surface_write_to_png (surface, filename);
g_print ("Output written to %s\n", filename);
g_object_unref (lines);
g_object_unref (breaker);
cairo_surface_destroy (surface);
cairo_destroy (cr);
g_object_unref (context);
return 0;
}
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