[cairo] [PATCH 5/5] Add test case for dashed lines.

[Jeff Muizelaar]

The new test case tests a variety of circumstances involved with zero length dashing.

---

diff --git a/test/Makefile.am b/test/Makefile.am
index b951b43..1eecbe2 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -16,6 +16,7 @@ create-from-png			\
 create-from-png-stream		\
 dash-caps-joins			\
 dash-offset-negative		\
+dash-zero-length		\
 extend-reflect			\
 fill-and-stroke			\
 fill-rule			\
@@ -140,6 +141,8 @@ dash-caps-joins-rgb24-ref.png				\
 dash-offset-negative-ref.png				\
 dash-offset-negative-rgb24-ref.png			\
 dash-offset-negative-ps-rgb24-ref.png			\
+dash-zero-length-ref.png				\
+dash-zero-length-rgb24-ref.png				\
 extend-reflect-ref.png					\
 extend-reflect-rgb24-ref.png				\
 fill-and-stroke-ref.png					\
@@ -317,6 +320,7 @@ create_from_png_LDADD = $(LDADDS)
 create_from_png_stream_LDADD = $(LDADDS)
 dash_caps_joins_LDADD = $(LDADDS)
 dash_offset_negative_LDADD = $(LDADDS)
+dash_zero_length_LDADD = $(LDADDS)
 extend_reflect_LDADD = $(LDADDS)
 fill_and_stroke_LDADD = $(LDADDS)
 fill_rule_LDADD = $(LDADDS)
diff --git a/test/dash-zero-length.c b/test/dash-zero-length.c
new file mode 100644
index 0000000..a5d0047
--- /dev/null
+++ b/test/dash-zero-length.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright © 2006 Jeff Muizelaar
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Jeff Muizelaar. not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Jeff Muizelaar. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * JEFF MUIZELAAR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL JEFF MUIZELAAR BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Jeff Muizelaar <jeff at infidigm.net>
+ */
+
+#include "cairo-test.h"
+
+#define IMAGE_WIDTH 19
+#define IMAGE_HEIGHT 25
+
+/* A test of the two extremes of dashing: a solid line
+ * and an invisible one. Also test that capping works
+ * on invisible lines.
+ */
+
+cairo_test_t test = {
+    "dash-zero-length",
+    "Tests cairo_set_dash with zero length",
+    IMAGE_WIDTH, IMAGE_HEIGHT
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    double solid_line[] = { 4, 0 };
+    double invisible_line[] = { 0, 4 };
+    double dotted_line[] = { 0, 6 };
+    double rounded_line[] = { 2, 6 };
+
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_set_line_width (cr, 2);
+
+    /* draw a solid line */
+    cairo_set_dash (cr, solid_line, 2, 0);
+    cairo_move_to (cr,  1, 2);
+    cairo_line_to (cr, 18, 2);
+    cairo_stroke (cr);
+
+    /* draw an invisible line */
+    cairo_set_dash (cr, invisible_line, 2, 0);
+    cairo_move_to (cr,  1, 8);
+    cairo_line_to (cr, 18, 8);
+    cairo_stroke (cr);
+
+    /* draw a dotted line */
+    cairo_set_line_width (cr, 5);
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+    cairo_set_dash (cr, dotted_line, 2, 0);
+    cairo_move_to (cr, 5, 13);
+    cairo_line_to (cr, 18, 13);
+    cairo_stroke (cr);
+
+    /* draw a rounded line */
+    cairo_set_line_width (cr, 5);
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+    cairo_set_dash (cr, rounded_line, 2, 2);
+    cairo_move_to (cr, 5, 20);
+    cairo_line_to (cr, 18, 20);
+    cairo_stroke (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test, draw);
+}