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69 lines
2.1 KiB
69 lines
2.1 KiB
/* Taken from
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* https://developer.gnome.org/pango/stable/pango-Cairo-Rendering.html */
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#include <math.h>
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#include <pango/pangocairo.h>
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static void draw_text(cairo_t* cr)
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{
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#define RADIUS 150
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#define N_WORDS 10
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#define FONT "Sans Bold 27"
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PangoLayout* layout;
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PangoFontDescription* desc;
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int i;
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/* Center coordinates on the middle of the region we are drawing
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*/
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cairo_translate(cr, RADIUS, RADIUS);
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/* Create a PangoLayout, set the font and text */
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layout = pango_cairo_create_layout(cr);
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pango_layout_set_text(layout, "Text", -1);
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desc = pango_font_description_from_string(FONT);
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pango_layout_set_font_description(layout, desc);
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pango_font_description_free(desc);
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/* Draw the layout N_WORDS times in a circle */
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for (i = 0; i < N_WORDS; i++) {
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int width, height;
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double angle = (360. * i) / N_WORDS;
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double red;
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cairo_save(cr);
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/* Gradient from red at angle == 60 to blue at angle == 240 */
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red = (1 + cos((angle - 60) * G_PI / 180.)) / 2;
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cairo_set_source_rgb(cr, red, 0, 1.0 - red);
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cairo_rotate(cr, angle * G_PI / 180.);
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/* Inform Pango to re-layout the text with the new transformation */
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pango_cairo_update_layout(cr, layout);
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pango_layout_get_size(layout, &width, &height);
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cairo_move_to(cr, -((double)width / PANGO_SCALE) / 2, -RADIUS);
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pango_cairo_show_layout(cr, layout);
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cairo_restore(cr);
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}
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/* free the layout object */
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g_object_unref(layout);
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}
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int main(int argc, char** argv)
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{
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cairo_t* cr;
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char* filename;
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cairo_status_t status;
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cairo_surface_t* surface;
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if (argc != 2) {
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g_printerr("Usage: cairosimple OUTPUT_FILENAME\n");
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return 1;
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}
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filename = argv[1];
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surface =
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cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 2 * RADIUS, 2 * RADIUS);
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cr = cairo_create(surface);
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cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
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cairo_paint(cr);
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draw_text(cr);
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cairo_destroy(cr);
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status = cairo_surface_write_to_png(surface, filename);
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cairo_surface_destroy(surface);
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if (status != CAIRO_STATUS_SUCCESS) {
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g_printerr("Could not save png to '%s'\n", filename);
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return 1;
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}
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return 0;
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}
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