rectilinear-dash.c [plain text]
#include "cairo-test.h"
#define SIZE 50
static void
draw_dashes (cairo_t *cr)
{
const double dash_square[4] = {4, 2, 2, 2};
const double dash_butt[4] = {5, 1, 3, 1};
cairo_save (cr);
cairo_set_dash (cr, dash_square, 4, 0);
cairo_set_line_width (cr, 1.0);
cairo_translate (cr, 1, 1);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
cairo_move_to (cr, 4.5, 0.5);
cairo_rel_line_to (cr, 2.0, 0.0);
cairo_move_to (cr, 10.5, 4.5);
cairo_rel_line_to (cr, 0.0, 2.0);
cairo_move_to (cr, 6.5, 10.5);
cairo_rel_line_to (cr, -2.0, 0.0);
cairo_move_to (cr, 0.5, 6.5);
cairo_rel_line_to (cr, 0.0, -2.0);
cairo_move_to (cr, 0.5, 2.5);
cairo_rel_line_to (cr, 0.0, -2.0);
cairo_rel_line_to (cr, 2.0, 0.0);
cairo_move_to (cr, 8.5, 0.5);
cairo_rel_line_to (cr, 2.0, 0.0);
cairo_rel_line_to (cr, 0.0, 2.0);
cairo_move_to (cr, 10.5, 8.5);
cairo_rel_line_to (cr, 0.0, 2.0);
cairo_rel_line_to (cr, -2.0, 0.0);
cairo_move_to (cr, 2.5, 10.5);
cairo_rel_line_to (cr, -2.0, 0.0);
cairo_rel_line_to (cr, 0.0, -2.0);
cairo_stroke (cr);
cairo_rectangle (cr, 0.5, 12.5, 10.0, 10.0);
cairo_set_dash (cr, dash_square, 4, 2);
cairo_stroke (cr);
cairo_translate (cr, 12, 0);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
cairo_set_dash (cr, dash_butt, 4, 0.0);
cairo_move_to (cr, 4.0, 0.5);
cairo_rel_line_to (cr, 3.0, 0.0);
cairo_move_to (cr, 10.5, 4.0);
cairo_rel_line_to (cr, 0.0, 3.0);
cairo_move_to (cr, 7.0, 10.5);
cairo_rel_line_to (cr, -3.0, 0.0);
cairo_move_to (cr, 0.5, 7.0);
cairo_rel_line_to (cr, 0.0, -3.0);
cairo_move_to (cr, 0.5, 3.0);
cairo_rel_line_to (cr, 0.0, -2.5);
cairo_rel_line_to (cr, 2.5, 0.0);
cairo_move_to (cr, 8.0, 0.5);
cairo_rel_line_to (cr, 2.5, 0.0);
cairo_rel_line_to (cr, 0.0, 2.5);
cairo_move_to (cr, 10.5, 8.0);
cairo_rel_line_to (cr, 0.0, 2.5);
cairo_rel_line_to (cr, -2.5, 0.0);
cairo_move_to (cr, 3.0, 10.5);
cairo_rel_line_to (cr, -2.5, 0.0);
cairo_rel_line_to (cr, 0.0, -2.5);
cairo_stroke (cr);
cairo_set_dash (cr, dash_butt, 4, 2.5);
cairo_rectangle (cr, 0.5, 12.5, 10.0, 10.0);
cairo_stroke (cr);
cairo_restore (cr);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
draw_dashes (cr);
cairo_save (cr);
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
cairo_translate (cr, 0, height);
cairo_scale (cr, 1, -1);
draw_dashes (cr);
cairo_restore (cr);
cairo_save (cr);
cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
cairo_translate (cr, width, 0);
cairo_scale (cr, -1, 1);
draw_dashes (cr);
cairo_restore (cr);
cairo_save (cr);
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
cairo_translate (cr, width, height);
cairo_scale (cr, -1, -1);
draw_dashes (cr);
cairo_restore (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (rectilinear_dash,
"Test dashed rectilinear stroke operations (covering only whole pixels)",
"stroke dash",
NULL,
SIZE, SIZE,
NULL, draw)