use float64

pkg/bitmap/bitmap.go

@@ -84,9 +84,9 @@ func (p Bitmap) SetFreeN(number int) error {
 	return fmt.Errorf("set free pixel: no such number=%d, max=%d", number, n)
 }
 
-func (p Bitmap) Circle(x, y int, r float32, fill bool) {
+func (p Bitmap) Circle(x, y int, r float64, fill bool) {
 	plotX := 0
-	plotY := int(math.Ceil(float64(r)))
+	plotY := int(math.Ceil(r))
 	delta := 3 - 2*plotY
 	lastY := plotY
 	for plotX <= plotY {

pkg/bitmap/bitmap_test.go

@@ -221,7 +221,7 @@ func TestClear(t *testing.T) {
 func TestCircle(t *testing.T) {
 	type testCase struct {
 		x, y   int
-		r      float32
+		r      float64
 		filled bool
 	}
 	for i, tc := range []testCase{