Improve visibility of selected indicator for ColoredRadioButton.

core/src/main/java/com/github/weisj/darklaf/color/DarkColorModel.java

@@ -60,34 +60,21 @@ public abstract class DarkColorModel {
     @Override
     public abstract String toString();
 
-    public abstract char[] getLabelDescriptorsBefore();
+    public abstract String[] getLabelDescriptorsBefore();
 
     public String[] getFullLabelDescriptorsBefore() {
         return labels;
     }
 
-    public char[] getLabelDescriptorsAfter() {
-        return new char[]{Character.MIN_VALUE, Character.MIN_VALUE, Character.MIN_VALUE, Character.MIN_VALUE};
+    public String[] getLabelDescriptorsAfter() {
+        return new String[]{"", "", "", ""};
     }
 
     public String[] getFullLabelDescriptorsAfter() {
-        char[] after = getLabelDescriptorsAfter();
-        String[] fullAfter = new String[after.length];
-        for (int i = 0; i < fullAfter.length; i++) {
-            if (after[i] != Character.MIN_VALUE) {
-                fullAfter[i] = String.valueOf(after[i]);
-            } else {
-                fullAfter[i] = "";
-            }
-        }
-        return fullAfter;
+        return getLabelDescriptorsAfter();
     }
 
-    public int[] getValuesFromColor(final Color color) {
-        return new int[]{color.getRed(), color.getGreen(), color.getBlue()};
-    }
+    public abstract int[] getValuesFromColor(final Color color);
 
-    public Color getColorFromValues(final int[] values) {
-        return new Color(values[0], values[1], values[2]);
-    }
+    public abstract Color getColorFromValues(final int[] values);
 }

core/src/main/java/com/github/weisj/darklaf/color/DarkColorModelCMYK.java

@@ -62,13 +62,13 @@ public class DarkColorModelCMYK extends DarkColorModel {
     }
 
     @Override
-    public char[] getLabelDescriptorsBefore() {
-        return new char[]{'C', 'M', 'Y', 'K'};
+    public String[] getLabelDescriptorsBefore() {
+        return new String[]{"C", "M", "Y", "K"};
     }
 
     @Override
-    public char[] getLabelDescriptorsAfter() {
-        return new char[]{'%', '%', '%', '%'};
+    public String[] getLabelDescriptorsAfter() {
+        return new String[]{"%", "%", "%", "%"};
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/color/DarkColorModelHSB.java

@@ -62,13 +62,13 @@ public class DarkColorModelHSB extends DarkColorModel {
     }
 
     @Override
-    public char[] getLabelDescriptorsBefore() {
-        return new char[]{'H', 'S', 'B'};
+    public String[] getLabelDescriptorsBefore() {
+        return new String[]{"H", "S", "B"};
     }
 
     @Override
-    public char[] getLabelDescriptorsAfter() {
-        return new char[]{'\u00B0', '%', '%'};
+    public String[] getLabelDescriptorsAfter() {
+        return new String[]{"\u00B0", "%", "%"};
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/color/DarkColorModelHSL.java

@@ -62,13 +62,13 @@ public class DarkColorModelHSL extends DarkColorModel {
     }
 
     @Override
-    public char[] getLabelDescriptorsBefore() {
-        return new char[]{'H', 'S', 'L'};
+    public String[] getLabelDescriptorsBefore() {
+        return new String[]{"H", "S", "L"};
     }
 
     @Override
-    public char[] getLabelDescriptorsAfter() {
-        return new char[]{'\u00B0', '%', '%'};
+    public String[] getLabelDescriptorsAfter() {
+        return new String[]{"\u00B0", "%", "%"};
     }
 
     @Override

core/src/main/java/com/github/weisj/darklaf/color/DarkColorModelRGB.java

@@ -53,12 +53,12 @@ public class DarkColorModelRGB extends DarkColorModel {
         return "RGB";
     }
 
-    public char[] getLabelDescriptorsBefore() {
-        return new char[]{'R', 'G', 'B'};
+    public String[] getLabelDescriptorsBefore() {
+        return new String[]{"R", "G", "B"};
     }
 
-    public char[] getLabelDescriptorsAfter() {
-        return new char[]{Character.MIN_VALUE, Character.MIN_VALUE, Character.MIN_VALUE, Character.MIN_VALUE};
+    public String[] getLabelDescriptorsAfter() {
+        return new String[]{"", "", "", ""};
     }
 
     public int[] getValuesFromColor(final Color color) {

core/src/main/java/com/github/weisj/darklaf/components/ColoredRadioButton.java

@@ -189,7 +189,7 @@ public class ColoredRadioButton extends JRadioButton {
             UIDefaults defaults = UIManager.getLookAndFeelDefaults();
             theme.loadDefaults(props, defaults);
             Color accentCol = color == DEFAULT_FILLED ? (Color) props.get("widgetFillDefault") : color;
-            Color focusCol = color == DEFAULT_FILLED ? accentCol : focusColor;
+            Color focusCol = focusColor == DEFAULT_FILLED ? accentCol : focusColor;
             adjustment.applyColors(LafManager.getTheme(), props, accentCol, null);
             PropertyLoader.putProperties(PropertyLoader.loadProperties(DarkLaf.class, "radioButton",
                                                                        "properties/ui/"),
@@ -204,12 +204,15 @@ public class ColoredRadioButton extends JRadioButton {
             for (String prop : COLOR_PROPERTIES) {
                 propertyMap.put(prop, accentCol);
             }
-            for (String prop : FOCUS_COLOR_PROPERTIES) {
-                propertyMap.put(prop, focusCol);
+            if (focusColor != DEFAULT_FILLED) {
+                for (String prop : FOCUS_COLOR_PROPERTIES) {
+                    propertyMap.put(prop, focusCol);
+                }
             }
             for (String prop : FOREGROUND_PROPERTIES) {
                 Color fg = ForegroundColorGenerationTask.makeAdjustedForeground((Color) props.get(prop),
-                                                                                accentCol, MIN_FG_CONTRAST);
+                                                                                accentCol,
+                                                                                MIN_FG_CONTRAST);
                 propertyMap.put(prop, fg);
             }
 

core/src/main/java/com/github/weisj/darklaf/settings/ThemeSettingsPanel.java

@@ -165,7 +165,7 @@ public class ThemeSettingsPanel extends JPanel {
         Color currentAccentColor = LafManager.getTheme().getAccentColorRule().getAccentColor();
         Color currentSelectionColor = LafManager.getTheme().getAccentColorRule().getSelectionColor();
 
-        JComponent selectionBox = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 0));
+        JComponent selectionBox = Box.createHorizontalBox();
         JLabel selectionColorLabel = new JLabel(resourceBundle.getString("label_selection_color"));
         selectionColorLabel.setLabelFor(selectionBox);
 
@@ -200,7 +200,7 @@ public class ThemeSettingsPanel extends JPanel {
         customSelection = addCustomButton(bgSelection, selectionBox, currentSelectionColor, defaultSelectionColor,
                                           resourceBundle.getString("color_custom"));
 
-        JComponent accentBox = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 0));
+        JComponent accentBox = Box.createHorizontalBox();
         JLabel accentColorLabel = new JLabel(resourceBundle.getString("label_accent_color"));
         accentColorLabel.setLabelFor(accentBox);
 

core/src/main/java/com/github/weisj/darklaf/task/ForegroundColorGenerationTask.java

@@ -31,10 +31,10 @@ import java.util.Properties;
 import javax.swing.plaf.ColorUIResource;
 
 import com.github.weisj.darklaf.color.DarkColorModelHSB;
+import com.github.weisj.darklaf.color.DarkColorModelHSL;
 import com.github.weisj.darklaf.theme.Theme;
 import com.github.weisj.darklaf.theme.info.AccentColorRule;
 import com.github.weisj.darklaf.uiresource.DarkColorUIResource;
-import com.github.weisj.darklaf.util.ColorUtil;
 import com.github.weisj.darklaf.util.Pair;
 
 public class ForegroundColorGenerationTask extends ColorAdjustmentTask {
@@ -70,10 +70,10 @@ public class ForegroundColorGenerationTask extends ColorAdjustmentTask {
                                                                        MIN_FOREGROUND_DIFFERENCE)));
     }
 
-    public static ColorUIResource makeForeground(final Color c, final double minimumBrightnessDifference) {
-        double[] hsbBG = DarkColorModelHSB.RGBtoHSBValues(c.getRed(), c.getGreen(), c.getBlue());
-        double[] hsbFG = new double[]{hsbBG[0], 0, 1 - hsbBG[2]};
-        return makeAdjustedForeground(hsbFG, hsbBG, Bias.BACKGROUND, minimumBrightnessDifference);
+    public static ColorUIResource makeForeground(final Color bg, final double minimumBrightnessDifference) {
+        double[] hsbBG = DarkColorModelHSB.RGBtoHSBValues(bg.getRed(), bg.getGreen(), bg.getBlue());
+        Color fg = DarkColorModelHSB.getColorFromHSBValues(hsbBG[0], 0, 1 - hsbBG[2]);
+        return makeAdjustedForeground(fg, bg, Bias.BACKGROUND, minimumBrightnessDifference);
     }
 
     public static ColorUIResource makeAdjustedForeground(final Color fg, final Color bg,
@@ -83,28 +83,47 @@ public class ForegroundColorGenerationTask extends ColorAdjustmentTask {
 
     public static ColorUIResource makeAdjustedForeground(final Color fg, final Color bg, final Bias bias,
                                                          final double minimumBrightnessDifference) {
-        double[] hsbBG = DarkColorModelHSB.RGBtoHSBValues(bg.getRed(), bg.getGreen(), bg.getBlue());
-        double[] hsbFG = DarkColorModelHSB.RGBtoHSBValues(fg.getRed(), fg.getGreen(), fg.getBlue());
-        return makeAdjustedForeground(hsbFG, hsbBG, bias, minimumBrightnessDifference);
-    }
-
-    private static ColorUIResource makeAdjustedForeground(final double[] hsbFG, final double[] hsbBG, final Bias bias,
-                                                          final double minimumBrightnessDifference) {
-        double bgBrightness = hsbBG[2];
-        double fgBrightness = hsbFG[2];
+        final double[] hslFG = DarkColorModelHSL.RGBtoHSLValues(fg.getRed(), fg.getGreen(), fg.getBlue());
+        final double[] hslBG = DarkColorModelHSL.RGBtoHSLValues(bg.getRed(), bg.getGreen(), bg.getBlue());
+        double bgBrightness = hslBG[2];
+        double fgBrightness = hslFG[2];
 
         Bias b = bias != null ? bias : Bias.BACKGROUND;
+
         if (b == Bias.BACKGROUND) {
-            Color c = DarkColorModelHSB.getColorFromHSBValues(hsbBG[0], hsbBG[1], hsbBG[2]);
-            double bgBright = (1 - hsbBG[1]) * ColorUtil.getPerceivedBrightness(c);
-            b = bgBright <= 127.5f ? Bias.WHITE : Bias.BLACK;
+            double bgBright = getLuminance(bg);
+            b = bgBright <= 0.552 ? Bias.WHITE : Bias.BLACK;
         }
 
-        double difference = Math.abs(fgBrightness - bgBrightness);
-        if (difference < minimumBrightnessDifference) {
-            fgBrightness += b.direction * (Math.abs(minimumBrightnessDifference - difference));
-        }
-        return new DarkColorUIResource(DarkColorModelHSB.getColorFromHSBValues(hsbFG[0], hsbFG[1], fgBrightness));
+        double bright1 = fgBrightness > bgBrightness && (fgBrightness - bgBrightness) >= minimumBrightnessDifference
+                ? hslFG[2]
+                : Math.min(bgBrightness + minimumBrightnessDifference, 1);
+        double bright2 = fgBrightness < bgBrightness && (bgBrightness - fgBrightness) >= minimumBrightnessDifference
+                ? hslFG[2]
+                : Math.max(bgBrightness - minimumBrightnessDifference, 0);
+
+        double brightness = b == Bias.WHITE ? bright1 : bright2;
+        return new DarkColorUIResource(DarkColorModelHSL.getColorFromHSLValues(hslFG[0], hslFG[1], brightness));
+    }
+
+    private static double getLuminance(final Color c) {
+        return getLuminance(c.getRed(), c.getGreen(), c.getBlue());
+    }
+
+    private static double getLuminance(final int red, final int green, final int blue) {
+        double r = red / 255.0;
+        double g = green / 255.0;
+        double b = blue / 255.0;
+        double R = r <= 0.03928 ? r / 12.92 : Math.pow((r + 0.055) / 1.055, 2.4);
+        double G = g <= 0.03928 ? g / 12.92 : Math.pow((g + 0.055) / 1.055, 2.4);
+        double B = b <= 0.03928 ? b / 12.92 : Math.pow((b + 0.055) / 1.055, 2.4);
+        return 0.2126 * R + 0.7152 * G + 0.0722 * B;
+    }
+
+    private static double calculateContrast(final double fgBrightness, final double bgBrightness) {
+        double bright = Math.max(fgBrightness, bgBrightness);
+        double dark = Math.min(fgBrightness, bgBrightness);
+        return (bright + 0.05) / (dark + 0.05);
     }
 
     public enum Bias {

core/src/main/java/com/github/weisj/darklaf/ui/colorchooser/DarkColorChooserPanel.java

@@ -233,7 +233,7 @@ public class DarkColorChooserPanel extends AbstractColorChooserPanel implements
     }
 
     private void updateDescriptors() {
-        char[] desc = getDarkColorModel().getLabelDescriptorsBefore();
+        String[] desc = getDarkColorModel().getLabelDescriptorsBefore();
         String[] descAfter = getDarkColorModel().getFullLabelDescriptorsAfter();
         for (int i = 0; i < descriptors.length; i++) {
             if (i < desc.length) {