create ColorTool

src/java/ru/dmitriymx/lwjgl/tools/ColorTool.java

@@ -0,0 +1,74 @@
+package ru.dmitriymx.lwjgl.tools;
+
+import java.awt.Color;
+
+public class ColorTool {
+
+    public static float IntToFloat(int value) {
+        return (value / 256.0f);
+    }
+
+    public static float[] AwtColorToColor4f(Color awtColor) {
+        return new float[] {
+                IntToFloat(awtColor.getRed()),
+                IntToFloat(awtColor.getGreen()),
+                IntToFloat(awtColor.getBlue()),
+                IntToFloat(awtColor.getAlpha())
+        };
+    }
+
+    //Examples:
+    //#ffaabbcc = ARGB
+    //#aabbcc = RGB
+    //#fabc = ARGB
+    //#abc = RGB
+    public static float[] HexColorToColor4f(String hexColor) {
+        if (hexColor.startsWith("#")) hexColor = hexColor.substring(1);
+
+        float[] color4f; // RGBA
+
+        switch (hexColor.length()) {
+        case 8:
+            color4f = new float[]{
+                    hex_to_float(hexColor.substring(2, 4)),
+                    hex_to_float(hexColor.substring(4, 6)),
+                    hex_to_float(hexColor.substring(6)),
+                    hex_to_float(hexColor.substring(0, 2))
+            };
+            break;
+        case 6:
+            color4f = new float[]{
+                    hex_to_float(hexColor.substring(0, 2)),
+                    hex_to_float(hexColor.substring(2, 4)),
+                    hex_to_float(hexColor.substring(4)),
+                    1f
+            };
+            break;
+        case 4:
+            color4f = new float[]{
+                    hex_to_float(hexColor.charAt(1) + "" + hexColor.charAt(1)),
+                    hex_to_float(hexColor.charAt(2) + "" + hexColor.charAt(2)),
+                    hex_to_float(hexColor.charAt(3) + "" + hexColor.charAt(3)),
+                    hex_to_float(hexColor.charAt(0) + "" + hexColor.charAt(0))
+            };
+            break;
+        case 3:
+            color4f = new float[]{
+                    hex_to_float(hexColor.charAt(0) + "" + hexColor.charAt(0)),
+                    hex_to_float(hexColor.charAt(1) + "" + hexColor.charAt(1)),
+                    hex_to_float(hexColor.charAt(2) + "" + hexColor.charAt(2)),
+                    1f
+            };
+            break;
+        default:
+            color4f = new float[]{0f, 0f, 0f, 1f};
+        }
+
+        return color4f;
+    }
+
+    private static float hex_to_float(String hex) {
+        long value = Long.parseLong(hex, 16);
+        return ((float)value / 256.0f);
+    }
+}