created line.go and moved tests and funcs

2016-08-27 20:46:10 -07:00
parent ace4f45155
commit 3850bdc592
5 changed files with 97 additions and 91 deletions
@@ -0,0 +1,49 @@
+package rect
+
+import "testing"
+
+func TestOnLine(t *testing.T) {
+	var onLineTest = []struct {
+		p        []Point
+		expected bool
+	}{
+		{[]Point{Point{1, 1}, Point{3, 3}, Point{2, 2}}, true},
+		{[]Point{Point{1, 1}, Point{3, 3}, Point{4, 4}}, false},
+		{[]Point{Point{-1, -1}, Point{-3, -3}, Point{-4, -4}}, false},
+		{[]Point{Point{-1, -1}, Point{-3, -3}, Point{-2, -2}}, true},
+	}
+	for _, rt := range onLineTest {
+		actual := onLine(rt.p[0], rt.p[1], rt.p[2])
+		if actual != rt.expected {
+			t.Errorf(
+				"failed onLine:\n\texpected: %t\n\t  actual: %t",
+				rt.expected,
+				actual,
+			)
+		}
+
+	}
+}
+
+func TestLineIntersection(t *testing.T) {
+	var lineIntersectionTest = []struct {
+		l        []line
+		expected Point
+	}{
+		{[]line{line{Point{0, 0}, Point{2, 2}}, line{Point{2, 0}, Point{0, 2}}}, Point{1, 1}},
+		{[]line{line{Point{0, 0}, Point{-2, -2}}, line{Point{-2, 0}, Point{0, -2}}}, Point{-1, -1}},
+		{[]line{line{Point{0, 0}, Point{-2, -2}}, line{Point{1, 0}, Point{1, -7}}}, Point{0, 0}},
+		{[]line{line{Point{5, 8}, Point{8, 5}}, line{Point{3, 7}, Point{7, 3}}}, Point{0, 0}},
+	}
+	for _, rt := range lineIntersectionTest {
+		actual, _ := lineIntersection(rt.l[0], rt.l[1])
+		if actual != rt.expected {
+			t.Errorf(
+				"failed lineIntersection:\n\texpected: %v\n\t  actual: %v",
+				rt.expected,
+				actual,
+			)
+		}
+
+	}
+}