From ced1c0227ecd1151f8dcabd5872f662bd4de389c Mon Sep 17 00:00:00 2001
From: Nor Khasyatillah <mazznoer@ymail.com>
Date: Wed, 17 Jul 2024 14:38:37 +0700
Subject: [PATCH] add Clamp()

---
 CHANGELOG.md        | 8 +++++++-
 colorparser.go      | 7 +++++++
 colorparser_test.go | 6 ++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 589e1f2..8266a35 100644
--- a/CHANGELOG.md
+++ b/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
 
diff --git a/colorparser.go b/colorparser.go
index a60c858..7e4ef9b 100644
--- a/colorparser.go
+++ b/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()
diff --git a/colorparser_test.go b/colorparser_test.go
index 7f8d9d0..35b9b4e 100644
--- a/colorparser_test.go
+++ b/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")