--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/tools/IdealGraphVisualizer/Graal/src/com/sun/hotspot/igv/graal/filters/GraalGradientColorFilter.java	Wed Jul 13 15:09:54 2011 +0200
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+package com.sun.hotspot.igv.graal.filters;
+
+import com.sun.hotspot.igv.graph.Diagram;
+import com.sun.hotspot.igv.graph.Figure;
+import java.awt.Color;
+import java.awt.LinearGradientPaint;
+import java.awt.PaintContext;
+import java.awt.Rectangle;
+import java.awt.RenderingHints;
+import java.awt.geom.AffineTransform;
+import java.awt.image.Raster;
+import java.util.List;
+
+/**
+ * Filter that colors nodes using a customizable color gradient, based on how
+ * a numeric property is located in a specified interval.
+ * 
+ * @author Peter Hofer
+ */
+public class GraalGradientColorFilter {
+
+    public enum Mode {
+        LINEAR,
+        LOGARITHMIC
+    };
+
+    private String propertyName = "probability";
+    private float minValue = 0;
+    private float maxValue = 500;
+    private float[] fractions = {0, 0.5f, 1};
+    private Color[] colors = {Color.BLUE, Color.YELLOW, Color.RED};
+    private int shadeCount = 8;
+    private Mode mode = Mode.LOGARITHMIC;
+
+    public void apply(Diagram d) {
+        Rectangle bounds = new Rectangle(shadeCount, 1);
+        LinearGradientPaint lgp = new LinearGradientPaint(bounds.x, bounds.y, bounds.width, bounds.y, fractions, colors);
+        PaintContext context = lgp.createContext(null, bounds, bounds.getBounds2D(), AffineTransform.getTranslateInstance(0, 0), new RenderingHints(null));
+        Raster raster = context.getRaster(bounds.x, bounds.y, bounds.width, bounds.height);
+        int[] rgb = raster.getPixels(bounds.x, bounds.y, bounds.width, bounds.height, (int[]) null);
+        Color[] shades = new Color[rgb.length / 3];
+        for (int i = 0; i < shades.length; ++i) {
+            shades[i] = new Color(rgb[i * 3], rgb[i * 3 + 1], rgb[i * 3 + 2]);
+        }
+
+        List<Figure> figures = d.getFigures();
+        for (Figure f : figures) {
+            String property = f.getProperties().get(propertyName);
+            if (property != null) {
+                try {
+                    float value = Float.parseFloat(property);
+
+                    Color nodeColor;
+                    if (value <= minValue) {
+                        nodeColor = colors[0];
+                    } else if (value >= maxValue) {
+                        nodeColor = colors[colors.length - 1];
+                    } else {
+                        double normalized = value - minValue;
+                        double interval = maxValue - minValue;
+                        int index;
+                        // Use Math.ceil() to make values above zero distinguishable from zero
+                        if (mode == Mode.LOGARITHMIC) {
+                            index = (int) Math.ceil(shades.length * Math.log(1 + normalized) / Math.log(1 + interval));
+                        } else if (mode == Mode.LINEAR) {
+                            index = (int) Math.ceil(shades.length * normalized / interval);
+                        } else {
+                            throw new RuntimeException("Unknown mode");
+                        }
+                        nodeColor = shades[index];
+                    }
+                    f.setColor(nodeColor);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+    public String getPropertyName() {
+        return propertyName;
+    }
+
+    public void setPropertyName(String propertyName) {
+        this.propertyName = propertyName;
+    }
+
+    public float getMinValue() {
+        return minValue;
+    }
+
+    public void setMinValue(float minValue) {
+        this.minValue = minValue;
+    }
+
+    public float getMaxValue() {
+        return maxValue;
+    }
+
+    public void setMaxValue(float maxValue) {
+        this.maxValue = maxValue;
+    }
+
+    public float[] getFractions() {
+        return fractions;
+    }
+
+    public void setFractions(float[] fractions) {
+        this.fractions = fractions;
+    }
+
+    public Color[] getColors() {
+        return colors;
+    }
+
+    public void setColors(Color[] colors) {
+        this.colors = colors;
+    }
+
+    public int getShadeCount() {
+        return shadeCount;
+    }
+
+    public void setShadeCount(int steps) {
+        this.shadeCount = steps;
+    }
+
+    public Mode getMode() {
+        return mode;
+    }
+
+    public void setMode(Mode mode) {
+        this.mode = mode;
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/tools/IdealGraphVisualizer/Graal/src/com/sun/hotspot/igv/graal/filters/probability.filter	Wed Jul 13 15:09:54 2011 +0200
@@ -0,0 +1,9 @@
+var pf = new com.sun.hotspot.igv.graal.filters.GraalGradientColorFilter();
+pf.setMode(com.sun.hotspot.igv.graal.filters.GraalGradientColorFilter.Mode.LOGARITHMIC);
+pf.setPropertyName("probability");
+pf.setMinValue(0);
+pf.setMaxValue(500);
+pf.setColors([blue, yellow, red]);
+pf.setFractions([0, 0.5, 1]);
+pf.setShadeCount(8);
+pf.apply(graph);

--- a/src/share/tools/IdealGraphVisualizer/Graal/src/com/sun/hotspot/igv/graal/layer.xml	Wed Jul 13 15:08:49 2011 +0200
+++ b/src/share/tools/IdealGraphVisualizer/Graal/src/com/sun/hotspot/igv/graal/layer.xml	Wed Jul 13 15:09:54 2011 +0200
@@ -13,5 +13,9 @@
         <file name="Graal Slot Filter" url="filters/slots.filter">
             <attr name="enabled" boolvalue="false"/>
         </file>
+        
+        <file name="Graal Probability Filter" url="filters/probability.filter">
+            <attr name="enabled" boolvalue="false"/>
+        </file>
     </folder>
 </filesystem>