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1 files changed, 229 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/GradientPaint.java b/libjava/classpath/java/awt/GradientPaint.java
new file mode 100644
index 000000000..0bb840755
--- /dev/null
+++ b/libjava/classpath/java/awt/GradientPaint.java
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+/* GradientPaint.java --
+   Copyright (C) 2002, 2005, Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt;
+
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Point2D;
+import java.awt.geom.Rectangle2D;
+import java.awt.image.ColorModel;
+import gnu.java.awt.GradientPaintContext;
+
+/**
+ * A paint object that can be used to color a region by blending two colors.
+ * Instances of this class are immutable.
+ */
+public class GradientPaint implements Paint
+{
+  private final float x1;
+  private final float y1;
+  private final Color c1;
+  private final float x2;
+  private final float y2;
+  private final Color c2;
+  private final boolean cyclic;
+
+  /**
+   * Creates a new acyclic <code>GradientPaint</code>.
+   *
+   * @param x1  the x-coordinate of the anchor point for color 1.
+   * @param y1  the y-coordinate of the anchor point for color 1.
+   * @param c1  color 1 (<code>null</code> not permitted).
+   * @param x2  the x-coordinate of the anchor point for color 2.
+   * @param y2  the y-coordinate of the anchor point for color 2.
+   * @param c2  the second color (<code>null</code> not permitted).
+   */
+  public GradientPaint(float x1, float y1, Color c1,
+                       float x2, float y2, Color c2)
+  {
+    this(x1, y1, c1, x2, y2, c2, false);
+  }
+
+  /**
+   * Creates a new acyclic <code>GradientPaint</code>.
+   *
+   * @param p1  anchor point 1 (<code>null</code> not permitted).
+   * @param c1  color 1 (<code>null</code> not permitted).
+   * @param p2  anchor point 2 (<code>null</code> not permitted).
+   * @param c2  color 2 (<code>null</code> not permitted).
+   */
+  public GradientPaint(Point2D p1, Color c1, Point2D p2, Color c2)
+  {
+    this((float) p1.getX(), (float) p1.getY(), c1,
+         (float) p2.getX(), (float) p2.getY(), c2, false);
+  }
+
+  /**
+   * Creates a new cyclic or acyclic <code>GradientPaint</code>.
+   *
+   * @param x1  the x-coordinate of the anchor point for color 1.
+   * @param y1  the y-coordinate of the anchor point for color 1.
+   * @param c1  color 1 (<code>null</code> not permitted).
+   * @param x2  the x-coordinate of the anchor point for color 2.
+   * @param y2  the y-coordinate of the anchor point for color 2.
+   * @param c2  the second color (<code>null</code> not permitted).
+   * @param cyclic  a flag that controls whether the gradient is cyclic or
+   *                acyclic.
+   */
+  public GradientPaint(float x1, float y1, Color c1,
+                       float x2, float y2, Color c2, boolean cyclic)
+  {
+    if (c1 == null || c2 == null)
+      throw new NullPointerException();
+    this.x1 = x1;
+    this.y1 = y1;
+    this.c1 = c1;
+    this.x2 = x2;
+    this.y2 = y2;
+    this.c2 = c2;
+    this.cyclic = cyclic;
+  }
+
+  /**
+   * Creates a new cyclic or acyclic <code>GradientPaint</code>.
+   *
+   * @param p1  anchor point 1 (<code>null</code> not permitted).
+   * @param c1  color 1 (<code>null</code> not permitted).
+   * @param p2  anchor point 2 (<code>null</code> not permitted).
+   * @param c2  color 2 (<code>null</code> not permitted).
+   * @param cyclic  a flag that controls whether the gradient is cyclic or
+   *                acyclic.
+   */
+  public GradientPaint(Point2D p1, Color c1, Point2D p2, Color c2,
+                       boolean cyclic)
+  {
+    this((float) p1.getX(), (float) p1.getY(), c1,
+         (float) p2.getX(), (float) p2.getY(), c2, cyclic);
+  }
+
+  /**
+   * Returns a point with the same coordinates as the anchor point for color 1.
+   * Note that if you modify this point, the <code>GradientPaint</code> remains
+   * unchanged.
+   *
+   * @return A point with the same coordinates as the anchor point for color 1.
+   */
+  public Point2D getPoint1()
+  {
+    return new Point2D.Float(x1, y1);
+  }
+
+  /**
+   * Returns the first color.
+   *
+   * @return The color (never <code>null</code>).
+   */
+  public Color getColor1()
+  {
+    return c1;
+  }
+
+  /**
+   * Returns a point with the same coordinates as the anchor point for color 2.
+   * Note that if you modify this point, the <code>GradientPaint</code> remains
+   * unchanged.
+   *
+   * @return A point with the same coordinates as the anchor point for color 2.
+   */
+  public Point2D getPoint2()
+  {
+    return new Point2D.Float(x2, y2);
+  }
+
+  /**
+   * Returns the second color.
+   *
+   * @return The color (never <code>null</code>).
+   */
+  public Color getColor2()
+  {
+    return c2;
+  }
+
+  /**
+   * Returns <code>true</code> if this <code>GradientPaint</code> instance is
+   * cyclic, and <code>false</code> otherwise.
+   *
+   * @return A boolean.
+   */
+  public boolean isCyclic()
+  {
+    return cyclic;
+  }
+
+  /**
+   * Returns the {@link PaintContext} used to generate the color pattern.
+   *
+   * @param cm  the color model, used as a hint (ignored in this
+   *            implementation).
+   * @param deviceBounds  the device space bounding box of the painted area.
+   * @param userBounds  the user space bounding box of the painted area.
+   * @param xform  the transformation from user space to device space.
+   * @param hints  any hints for choosing between rendering alternatives.
+   *
+   * @return The context for performing the paint
+   */
+  public PaintContext createContext(ColorModel cm, Rectangle deviceBounds,
+                                    Rectangle2D userBounds,
+                                    AffineTransform xform,
+                                    RenderingHints hints)
+  {
+    Point2D xp1 = xform.transform(getPoint1(), null);
+    Point2D xp2 = xform.transform(getPoint2(), null);
+    return new GradientPaintContext((float) xp1.getX(), (float) xp1.getY(), c1,
+            (float) xp2.getX(), (float) xp2.getY(), c2, cyclic);
+  }
+
+  /**
+   * Returns the transparency code for this <code>GradientPaint</code> instance.
+   * This is derived from the two {@link Color} objects used in creating this
+   * object:  if both colors are opaque, this method returns
+   * {@link Transparency#OPAQUE}, otherwise it returns
+   * {@link Transparency#TRANSLUCENT}.
+   *
+   * @return {@link Transparency#OPAQUE} or {@link Transparency#TRANSLUCENT}.
+   */
+  public int getTransparency()
+  {
+    if (c1.getAlpha() == 255 && c2.getAlpha() == 255)
+      return Transparency.OPAQUE;
+    else
+      return Transparency.TRANSLUCENT;
+  }
+
+} // class GradientPaint