add Clamp()

CHANGELOG.md

@@ -1,6 +1,12 @@
 # Changelog
 
-## [Unreleased](https://github.com/mazznoer/csscolorparser/compare/v0.1.3...HEAD)
+## [Unreleased](https://github.com/mazznoer/csscolorparser/compare/v0.1.4...HEAD)
+
+### Added
+
+- `Clamp()`
+
+## v0.1.4
 
 ### Added
 

colorparser.go

@@ -33,6 +33,13 @@ func (c Color) RGBA255() (r, g, b, a uint8) {
 	return
 }
 
+func (c *Color) Clamp() {
+	c.R = math.Max(math.Min(c.R, 1), 0)
+	c.G = math.Max(math.Min(c.G, 1), 0)
+	c.B = math.Max(math.Min(c.B, 1), 0)
+	c.A = math.Max(math.Min(c.A, 1), 0)
+}
+
 // HexString returns CSS hexadecimal string.
 func (c Color) HexString() string {
 	r, g, b, a := c.RGBA255()

colorparser_test.go

@@ -38,6 +38,12 @@ func TestColor(t *testing.T) {
 	equalStr(t, c.HexString(), "#0000ff80")
 	equalStr(t, c.RGBString(), "rgba(0,0,255,0.5)")
 
+	c = Color{1.2001, 0.999, -0.001, 0.001}
+	c.Clamp()
+	if !isColorEqual(c, Color{1, 0.999, 0, 0.001}) {
+		t.Errorf("failed: %v", c)
+	}
+
 	c = FromHwb(0, 0, 0, 1)
 	equalStr(t, c.HexString(), "#ff0000")