09-12

src/tool/util.js

@@ -59,23 +59,25 @@ function rgbToHsv([R, G, B]) {
     B /= 255
     const max = Math.max(R, G, B)
     const min = Math.min(R, G, B)
-    const range = max - min
-    let V = max
-    let S = V === 0 ? 0 : range / V
-    let H = 0
-    if (R === V) H = (60 * (G - B)) / range
-    if (G === V) H = 120 + (60 * (B - R)) / range
-    if (B === V) H = 240 + (60 * (R - G)) / range
-   
-    if (range === 0) H = 0
-    if (H < 0) H += 360
-    H = (H / 2) * (256 / 180)
-    S *= 255
-    V *= 255
-
-    H = parseInt(H)
-    S = parseInt(S)
-    V = parseInt(V) 
+    const delta = max - min
+	var H,S,V
+	if (delta === 0) {
+	  H = 0;
+	} else if (max === R) {
+	  H = ((G - B) / delta) % 6;
+	} else if (max === G) {
+	  H = (B - R) / delta + 2;
+	} else { // max === B
+	  H = (R - G) / delta + 4;
+	}
+	H = Math.round(H * 60); // 范围为 0-360
+	if (max === 0) {
+	  S = 0;
+	} else {
+	  S = delta / max;
+	}
+	S = Math.round(S*100); // 范围为 0-100
+	V = Math.round(max*100); // 范围为 0-100
     return [H, S, V]
   }