Intersection work in progress
Review URL: https://codereview.appspot.com/5576043
git-svn-id: http://skia.googlecode.com/svn/trunk@3087 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/Intersection/LineCubicIntersection_Test.cpp b/experimental/Intersection/LineCubicIntersection_Test.cpp
new file mode 100644
index 0000000..3f2c622
--- /dev/null
+++ b/experimental/Intersection/LineCubicIntersection_Test.cpp
@@ -0,0 +1,55 @@
+#include "CubicIntersection.h"
+#include "Intersection_Tests.h"
+#include "Intersections.h"
+#include "LineUtilities.h"
+#include "TestUtilities.h"
+
+struct lineCubic {
+ Cubic cubic;
+ _Line line;
+} lineCubicTests[] = {
+ {{{0, 0}, {0, 1}, {0, 1}, {1, 1}}, {{0, 1}, {1, 0}}}
+};
+
+size_t lineCubicTests_count = sizeof(lineCubicTests) / sizeof(lineCubicTests[0]);
+
+const int firstLineCubicIntersectionTest = 0;
+
+void LineCubicIntersection_Test() {
+ for (size_t index = firstLineCubicIntersectionTest; index < lineCubicTests_count; ++index) {
+ const Cubic& cubic = lineCubicTests[index].cubic;
+ const _Line& line = lineCubicTests[index].line;
+ Cubic reduce1;
+ _Line reduce2;
+ int order1 = reduceOrder(cubic, reduce1, kReduceOrder_NoQuadraticsAllowed);
+ int order2 = reduceOrder(line, reduce2);
+ if (order1 < 4) {
+ printf("[%d] cubic order=%d\n", (int) index, order1);
+ }
+ if (order2 < 2) {
+ printf("[%d] line order=%d\n", (int) index, order2);
+ }
+ if (order1 == 4 && order2 == 2) {
+ Intersections intersections;
+ intersectStart(reduce1, reduce2, intersections);
+ if (intersections.intersected()) {
+ for (int pt = 0; pt < intersections.used(); ++pt) {
+ double tt1 = intersections.fT[0][pt];
+ double tx1, ty1;
+ xy_at_t(cubic, tt1, tx1, ty1);
+ double tt2 = intersections.fT[1][pt];
+ double tx2, ty2;
+ xy_at_t(line, tt2, tx2, ty2);
+ if (!approximately_equal(tx1, tx2)) {
+ printf("%s [%d,%d] x!= t1=%g (%g,%g) t2=%g (%g,%g)\n",
+ __FUNCTION__, (int)index, pt, tt1, tx1, ty1, tt2, tx2, ty2);
+ }
+ if (!approximately_equal(ty1, ty2)) {
+ printf("%s [%d,%d] y!= t1=%g (%g,%g) t2=%g (%g,%g)\n",
+ __FUNCTION__, (int)index, pt, tt1, tx1, ty1, tt2, tx2, ty2);
+ }
+ }
+ }
+ }
+ }
+}