ScaledIcon.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@1676 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/swing/ScaledIcon.java

@@ -0,0 +1,79 @@
+//
+// $Id: ScaledIcon.java,v 1.1 2004/04/23 16:46:37 ray Exp $
+
+package com.samskivert.swing;
+
+import java.awt.Component;
+import java.awt.Composite;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.geom.AffineTransform;
+
+import javax.swing.Icon;
+
+/**
+ * Draws an icon with a specified scale.
+ */
+public class ScaledIcon implements Icon
+{
+    /**
+     * Construct an icon that is drawn at 10% normal.
+     */
+    public ScaledIcon (Icon icon)
+    {
+        this(icon, .1f);
+    }
+
+    /**
+     * Construct a scaled icon that is drawn at the specified scale.
+     */
+    public ScaledIcon (Icon icon, float scale)
+    {
+        _icon = icon;
+        _scale = scale;
+    }
+
+    /**
+     * Construct a scaled icon restricted to its larger dimension.
+     */
+    public ScaledIcon (Icon icon, int maxWidth, int maxHeight)
+    {
+        this(icon, Math.min(maxWidth / (float) icon.getIconWidth(),
+                            maxHeight / (float) icon.getIconHeight()));
+    }
+
+    // documentation inherited from interface Icon
+    public int getIconWidth ()
+    {
+        return (int) Math.round(_icon.getIconWidth() * _scale);
+    }
+
+    // documentation inherited from interface Icon
+    public int getIconHeight ()
+    {
+        return (int) Math.round(_icon.getIconHeight() * _scale);
+    }
+
+    // documentation inherited from interface Icon
+    public void paintIcon (Component c, Graphics g, int x, int y)
+    {
+        Graphics2D gfx = (Graphics2D) g;
+        AffineTransform otrans = gfx.getTransform();
+        RenderingHints ohints = gfx.getRenderingHints();
+
+        gfx.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
+            RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+        gfx.scale(_scale, _scale);
+        _icon.paintIcon(c, g, x, y);
+
+        gfx.setTransform(otrans);
+        gfx.setRenderingHints(ohints);
+    }
+
+    /** The icon we're actually drawing. */
+    protected Icon _icon;
+
+    /** Our scale factor. */
+    protected float _scale;
+}