Adds getColorFromName using great canvas pixel trick

hansonr · hansonr · commit 36ee93ee4c0b · 2019-07-13T10:13:33.000+01:00
diff --git a/sources/net.sf.j2s.java.core/src/swingjs/JSUtil.java b/sources/net.sf.j2s.java.core/src/swingjs/JSUtil.java
@@ -1,5 +1,6 @@
 package swingjs;
 
+import java.awt.Color;
 import java.awt.JSComponent;
 import java.awt.Toolkit;
 import java.io.BufferedInputStream;
@@ -628,5 +629,31 @@ public static boolean isOverridden(Object c, String name, Class<?> cl) {
 		return cl == null || c != null && !isForClass(getJ2SAlias(c, name), cl);
 	}
 
+	static Object ctxTemp;
+
+	/**
+	 * A great trick to get a Java Color from a name using JavaScript.
+	 * https://stackoverflow.com/questions/1573053/javascript-function-to-convert-color-names-to-hex-codes
+	 *  
+	 * @param c
+	 * @return
+	 */
+	@SuppressWarnings({ "null" })
+	public static Color getColorFromName(String c) {
+		int[] rgb = null;
+		/**
+		 * @j2sNative
+		 * 
+		 * 	if (C$.ctxTemp == null) { 
+		 *    var d = document.createElement("canvas"); 
+		 *    d.height = d.width = 1;
+		 *    C$.ctxTemp = d.getContext("2d"); 
+		 *  } 
+		 *  C$.ctxTemp.fillStyle = c;
+		 *  C$.ctxTemp.fillRect(0, 0, 1, 1); 
+		 *  rgb = C$.ctxTemp.getImageData(0, 0, 1, 1).data;
+		 */		
+		return new Color(rgb[0], rgb[1], rgb[2]);
+	}
 }
 
