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+/*
+ * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package demos.xtrans;
+
+import gleem.linalg.*;
+
+/** A quadrilateral in which the vertices are two-dimensional
+ * floating-point values.
+ *
+ * @author Kenneth Russell
+ */
+
+public class Quad2f {
+  private Vec2f[] vecs;
+
+  public static final int UPPER_LEFT  = 0;
+  public static final int LOWER_LEFT  = 1;
+  public static final int LOWER_RIGHT = 2;
+  public static final int UPPER_RIGHT = 2;
+
+  private static final int NUM_VECS = 4;
+  
+  /** Constructs a Quad2f in which all the vertices are set to the
+      origin. */
+  public Quad2f() {
+    vecs = new Vec2f[NUM_VECS];
+    for (int i = 0; i < NUM_VECS; i++) {
+      vecs[i] = new Vec2f();
+    }
+  }
+
+  /** Constructs a Quad2f in which the vertices are set to the
+      specified values. */
+  public Quad2f(Vec2f upperLeft,
+                Vec2f lowerLeft,
+                Vec2f lowerRight,
+                Vec2f upperRight) {
+    this();
+    setVec(0, upperLeft);
+    setVec(1, lowerLeft);
+    setVec(2, lowerRight);
+    setVec(3, upperRight);
+  }
+
+  /** Sets the specified vertex to the specified value. */
+  public void setVec(int which, Vec2f val) {
+    vecs[which].set(val);
+  }
+
+  /** Returns the specified vertex. */
+  public Vec2f getVec(int which) {
+    return vecs[which];
+  }
+
+  /** Sets all four points of this quadrilateral. */
+  public void set(Quad2f quad) {
+    for (int i = 0; i < NUM_VECS; i++) {
+      setVec(i, quad.getVec(i));
+    }
+  }
+
+  /** Returns a newly-constructed Quad2f in which all vertices have
+      been multiplied in scalar fashion by the passed value.  */
+  public Quad2f times(float val) {
+    return new Quad2f(getVec(0).times(val),
+                      getVec(1).times(val),
+                      getVec(2).times(val),
+                      getVec(3).times(val));
+  }
+
+  /** Returns a newly-constructed Quad2f in which the vertices are the
+      component-wise sums of this quad and the passed quad. */
+  public Quad2f plus(Quad2f val) {
+    return new Quad2f(getVec(0).plus(val.getVec(0)),
+                      getVec(1).plus(val.getVec(1)),
+                      getVec(2).plus(val.getVec(2)),
+                      getVec(3).plus(val.getVec(3)));
+  }
+}