--- /dev/null
+package be.nikiroo.utils.ui;
+
+import java.awt.Color;
+import java.awt.GradientPaint;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Paint;
+import java.awt.RadialGradientPaint;
+import java.awt.RenderingHints;
+
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+/**
+ * Some Java Swing utilities.
+ *
+ * @author niki
+ */
+public class UIUtils {
+ /**
+ * Set a fake "native look & feel" for the application if possible
+ * (check for the one currently in use, then try GTK).
+ * <p>
+ * <b>Must</b> be called prior to any GUI work.
+ */
+ static public void setLookAndFeel() {
+ // native look & feel
+ try {
+ String noLF = "javax.swing.plaf.metal.MetalLookAndFeel";
+ String lf = UIManager.getSystemLookAndFeelClassName();
+ if (lf.equals(noLF))
+ lf = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
+ UIManager.setLookAndFeel(lf);
+ } catch (InstantiationException e) {
+ } catch (ClassNotFoundException e) {
+ } catch (UnsupportedLookAndFeelException e) {
+ } catch (IllegalAccessException e) {
+ }
+ }
+
+ /**
+ * Draw a 3D-looking ellipse at the given location, if the given
+ * {@link Graphics} object is compatible (with {@link Graphics2D}); draw a
+ * simple ellipse if not.
+ *
+ * @param g
+ * the {@link Graphics} to draw on
+ * @param color
+ * the base colour
+ * @param x
+ * the X coordinate
+ * @param y
+ * the Y coordinate
+ * @param width
+ * the width radius
+ * @param height
+ * the height radius
+ */
+ static public void drawEllipse3D(Graphics g, Color color, int x, int y,
+ int width, int height) {
+ if (g instanceof Graphics2D) {
+ Graphics2D g2 = (Graphics2D) g;
+ g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+ RenderingHints.VALUE_ANTIALIAS_ON);
+
+ // Retains the previous state
+ Paint oldPaint = g2.getPaint();
+
+ // Base shape
+ g2.setColor(color);
+ g2.fillOval(x, y, width, height);
+
+ // Compute dark/bright colours
+ Paint p = null;
+ Color dark = color.darker();
+ Color bright = color.brighter();
+ Color darkEnd = new Color(dark.getRed(), dark.getGreen(),
+ dark.getBlue(), 0);
+ Color darkPartial = new Color(dark.getRed(), dark.getGreen(),
+ dark.getBlue(), 64);
+ Color brightEnd = new Color(bright.getRed(), bright.getGreen(),
+ bright.getBlue(), 0);
+
+ // Adds shadows at the bottom left
+ p = new GradientPaint(0, height, dark, width, 0, darkEnd);
+ g2.setPaint(p);
+ g2.fillOval(x, y, width, height);
+
+ // Adds highlights at the top right
+ p = new GradientPaint(width, 0, bright, 0, height, brightEnd);
+ g2.setPaint(p);
+ g2.fillOval(x, y, width, height);
+
+ // Darken the edges
+ p = new RadialGradientPaint(x + width / 2f, y + height / 2f,
+ Math.min(width / 2f, height / 2f), new float[] { 0f, 1f },
+ new Color[] { darkEnd, darkPartial },
+ RadialGradientPaint.CycleMethod.NO_CYCLE);
+ g2.setPaint(p);
+ g2.fillOval(x, y, width, height);
+
+ // Adds inner highlight at the top right
+ p = new RadialGradientPaint(x + 3f * width / 4f, y + height / 4f,
+ Math.min(width / 4f, height / 4f),
+ new float[] { 0.0f, 0.8f },
+ new Color[] { bright, brightEnd },
+ RadialGradientPaint.CycleMethod.NO_CYCLE);
+ g2.setPaint(p);
+ g2.fillOval(x * 2, y, width, height);
+
+ // Reset original paint
+ g2.setPaint(oldPaint);
+ } else {
+ g.setColor(color);
+ g.fillOval(x, y, width, height);
+ }
+ }
+}