1 files changed, 74 insertions, 0 deletions
diff --git a/src/demos/xtrans/Quad2f.java b/src/demos/xtrans/Quad2f.java
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+++ b/src/demos/xtrans/Quad2f.java
@@ -0,0 +1,74 @@
+package demos.xtrans;
+
+import gleem.linalg.*;
+
+/** A quadrilateral in which the vertices are two-dimensional
+    floating-point values. */
+
+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)));
+  }
+}