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diff test/automated/rect/rect.c @ 3541:0c429a5fda8a

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Added an automated test for rectangle routines, currently only testing line clipping. Use the Cohen-Sutherland algorithm for line clipping which uses integer math and preserves ordering of clipped points. Removed getopt() support in testsdl.c, replaced with simple argv scanning.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Dec 2009 09:22:34 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/automated/rect/rect.c	Fri Dec 11 09:22:34 2009 +0000
@@ -0,0 +1,156 @@
+/**
+ * Automated SDL rect test.
+ *
+ * Written by Edgar Simo "bobbens"
+ *
+ * Released under Public Domain.
+ */
+
+
+
+
+#include "SDL_rect.h"
+#include "../SDL_at.h"
+
+
+/*
+ * Prototypes.
+ */
+static void rect_testIntersectRectAndLine (void);
+
+
+/**
+ * @brief Tests SDL_IntersectRectAndLine()
+ */
+static void rect_testIntersectRectAndLine (void)
+{
+    SDL_Rect rect = { 0, 0, 32, 32 };
+    int x1, y1;
+    int x2, y2;
+    SDL_bool clipped;
+
+    SDL_ATbegin( "IntersectRectAndLine" );
+
+    x1 = -10;
+    y1 = 0;
+    x2 = -10;
+    y2 = 31;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( !clipped &&
+                   x1 == -10 && y1 == 0 && x2 == -10 && y2 == 31,
+        "line outside to the left was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = 40;
+    y1 = 0;
+    x2 = 40;
+    y2 = 31;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( !clipped &&
+                   x1 == 40 && y1 == 0 && x2 == 40 && y2 == 31,
+        "line outside to the right was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = 0;
+    y1 = -10;
+    x2 = 31;
+    y2 = -10;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( !clipped &&
+                   x1 == 0 && y1 == -10 && x2 == 31 && y2 == -10,
+        "line outside above was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = 0;
+    y1 = 40;
+    x2 = 31;
+    y2 = 40;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( !clipped &&
+                   x1 == 0 && y1 == 40 && x2 == 31 && y2 == 40,
+        "line outside below was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = 0;
+    y1 = 0;
+    x2 = 31;
+    y2 = 31;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( clipped &&
+                   x1 == 0 && y1 == 0 && x2 == 31 && y2 == 31,
+        "line fully inside rect was clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = -10;
+    y1 = 15;
+    x2 = 40;
+    y2 = 15;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( clipped &&
+                   x1 == 0 && y1 == 15 && x2 == 31 && y2 == 15,
+        "horizontal line rect was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = -32;
+    y1 = -32;
+    x2 = 63;
+    y2 = 63;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( clipped &&
+                   x1 == 0 && y1 == 0 && x2 == 31 && y2 == 31,
+        "diagonal line to lower right was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = 63;
+    y1 = 63;
+    x2 = -32;
+    y2 = -32;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( clipped &&
+                   x1 == 31 && y1 == 31 && x2 == 0 && y2 == 0,
+        "diagonal line to upper left was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = 63;
+    y1 = -32;
+    x2 = -32;
+    y2 = 63;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( clipped &&
+                   x1 == 31 && y1 == 0 && x2 == 0 && y2 == 31,
+        "diagonal line to lower left was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    x1 = -32;
+    y1 = 63;
+    x2 = 63;
+    y2 = -32;
+    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
+    SDL_ATvassert( clipped &&
+                   x1 == 0 && y1 == 31 && x2 == 31 && y2 == 0,
+        "diagonal line to upper right was incorrectly clipped: %d,%d - %d,%d",
+        x1, y1, x2, y2);
+
+    SDL_ATend();
+}
+
+
+/**
+ * @brief Rect test entrypoint.
+ */
+#ifdef TEST_STANDALONE
+int main( int argc, const char *argv[] )
+{
+   (void) argc;
+   (void) argv;
+#else /* TEST_STANDALONE */
+int test_rect (void)
+{
+#endif /* TEST_STANDALONE */
+
+   SDL_ATinit( "Rect" );
+
+   rect_testIntersectRectAndLine();
+
+   return SDL_ATfinish();
+}