It's useful to have our own friendly, simple rectangles and points independent from the various graphics systems that may or may not be available (e.g. java.awt)

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6648 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/main/java/com/threerings/geom/Point.java

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+package com.threerings.geom;
+
+/**
+ * A very simple representation of the geometric concept, because sometimes we can't use awt.
+ */
+public class Point
+{
+    /** The x-coordinate. */
+    public int x;
+
+    /** The y-coordinate. */
+    public int y;
+
+    public Point ()
+    {
+        this(0, 0);
+    }
+
+    public Point (int x, int y)
+    {
+        this.x = x;
+        this.y = y;
+    }
+}

src/main/java/com/threerings/geom/Rectangle.java

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+package com.threerings.geom;
+
+/**
+ * A very simple representation of the geometric shape, because sometimes we can't use awt.
+ */
+public class Rectangle
+{
+    /** The left-most x-coordinate. */
+    public int x;
+
+    /** The top-most y-coordinate. */
+    public int y;
+
+    /** The width of the rectangle. */
+    public int width;
+
+    /** The height of the rectangle. */
+    public int height;
+
+    public Rectangle ()
+    {
+        this(0, 0, 0, 0);
+    }
+
+    public Rectangle (int x, int y, int width, int height)
+    {
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+    }
+
+    public Rectangle (Rectangle other)
+    {
+        x = other.x;
+        y = other.y;
+        width = other.width;
+        height = other.height;
+    }
+
+    /**
+     * Returns the area of intersection of ourselves and another rectangle.
+     */
+    public Rectangle intersect (Rectangle other)
+    {
+        int x1 = Math.max(x, other.x), y1 = Math.max(y, other.y),
+            x2 = Math.min(x + width, other.x + other.width),
+            y2 = Math.min(y + height, other.y + other.height);
+        return new Rectangle(x1, y1, Math.max(0, x2 - x1), Math.max(0, y2 - y1));
+    }
+
+    /**
+     * Returns whether the specified coordinates are within the rectangle.
+     */
+    public boolean contains (int x, int y)
+    {
+        return (x >= this.x && x <= (this.x + width) && y >= this.y && y <= (this.y + height));
+    }
+
+    /**
+     * Returns whether this rectangle covers any area.
+     */
+    public boolean isEmpty ()
+    {
+        return width <= 0 || height <= 0;
+    }
+
+    /**
+     * Sets our position and size.
+     */
+    public void set (int x, int y, int width, int height)
+    {
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+    }
+}