✨ (clockface): add minuteHandPoint

Author: yuanyu90221

clockface_sample/clockface/clockface.go

@@ -30,14 +30,21 @@ func secondsInRadians(t time.Time) float64 {
 }
 
 func secondHandPoint(t time.Time) Point {
-	angle := secondsInRadians(t)
+	return angleToPoint(secondsInRadians(t))
+}
+
+func minutesInRadians(t time.Time) float64 {
+	return (secondsInRadians(t) / 60) +
+		(math.Pi / (30 / float64(t.Minute())))
+}
+
+func angleToPoint(angle float64) Point {
 	x := math.Sin(angle)
 	y := math.Cos(angle)
 
 	return Point{x, y}
 }
 
-func minutesInRadians(t time.Time) float64 {
-	return (secondsInRadians(t) / 60) +
-		(math.Pi / (30 / float64(t.Minute())))
+func minuteHandPoint(t time.Time) Point {
+	return angleToPoint(minutesInRadians(t))
 }

clockface_sample/clockface/clockface_test.go

@@ -81,3 +81,22 @@ func TestMinutesInRadians(t *testing.T) {
 		})
 	}
 }
+
+func TestMinuteHandPoint(t *testing.T) {
+	cases := []struct {
+		time  time.Time
+		point Point
+	}{
+		{simpleTime(0, 30, 0), Point{0, -1}},
+		{simpleTime(0, 45, 0), Point{-1, 0}},
+	}
+
+	for _, c := range cases {
+		t.Run(testName(c.time), func(t *testing.T) {
+			got := minuteHandPoint(c.time)
+			if !roughlyEqualPoint(got, c.point) {
+				t.Fatalf("Wanted %v Point, but got %v", c.point, got)
+			}
+		})
+	}
+}