增加使用亮度生成系列颜色的功能。

color-module/src/lib.rs

@@ -270,3 +270,29 @@ pub fn triadic(color: &str) -> Result<Vec<String>, errors::ColorError> {
         format!("{:x}", srgb_p240.into_format::<u8>()),
     ])
 }
+
+#[wasm_bindgen]
+pub fn series(
+    color: &str,
+    expand_amount: i16,
+    step: f32,
+) -> Result<Vec<String>, errors::ColorError> {
+    let origin_color = Srgb::from_str(color)
+        .map_err(|_| errors::ColorError::UnrecogniazedRGB(color.to_string()))?
+        .into_format::<f32>();
+    let oklch = Oklch::from_color(origin_color.clone());
+
+    let mut color_series = Vec::new();
+    for s in expand_amount..1 {
+        let darkened_color = oklch.darken(s as f32 * step);
+        let srgb = Srgb::from_color(darkened_color);
+        color_series.push(format!("{:x}", srgb.into_format::<u8>()));
+    }
+    color_series.push(format!("{:x}", origin_color.into_format::<u8>()));
+    for s in 1..expand_amount {
+        let lightened_color = oklch.lighten(s as f32 * step);
+        let srgb = Srgb::from_color(lightened_color);
+        color_series.push(format!("{:x}", srgb.into_format::<u8>()));
+    }
+    Ok(color_series)
+}