rakib-amin · January 14, 2019 04:16 · Jan 14, 2019 · Jan 14, 2019
diff --git a/DocComments.java b/DocComments.java
@@ -0,0 +1,120 @@
+/**
+ * Graphics is the abstract base class for all graphics contexts
+ * which allow an application to draw onto components realized on
+ * various devices or onto off-screen images.
+ * A Graphics object encapsulates the state information needed
+ * for the various rendering operations that Java supports.  This
+ * state information includes:
+ * <ul>
+ * <li>The Component to draw on
+ * <li>A translation origin for rendering and clipping coordinates
+ * <li>The current clip
+ * <li>The current color
+ * <li>The current font
+ * <li>The current logical pixel operation function (XOR or Paint)
+ * <li>The current XOR alternation color
+ *     (see <a href="#setXORMode">setXORMode</a>)
+ * </ul>
+ * <p>
+ * Coordinates are infinitely thin and lie between the pixels of the
+ * output device.
+ * Operations which draw the outline of a figure operate by traversing
+ * along the infinitely thin path with a pixel-sized pen that hangs
+ * down and to the right of the anchor point on the path.
+ * Operations which fill a figure operate by filling the interior
+ * of the infinitely thin path.
+ * Operations which render horizontal text render the ascending
+ * portion of the characters entirely above the baseline coordinate.
+ * <p>
+ * Some important points to consider are that drawing a figure that
+ * covers a given rectangle will occupy one extra row of pixels on
+ * the right and bottom edges compared to filling a figure that is
+ * bounded by that same rectangle.
+ * Also, drawing a horizontal line along the same y coordinate as
+ * the baseline of a line of text will draw the line entirely below
+ * the text except for any descenders.
+ * Both of these properties are due to the pen hanging down and to
+ * the right from the path that it traverses.
+ * <p>
+ * All coordinates which appear as arguments to the methods of this
+ * Graphics object are considered relative to the translation origin
+ * of this Graphics object prior to the invocation of the method.
+ * All rendering operations modify only pixels which lie within the
+ * area bounded by both the current clip of the graphics context
+ * and the extents of the Component used to create the Graphics object.
+ * 
+ * @author      Sami Shaio
+ * @author      Arthur van Hoff
+ * @version     %I%, %G%
+ * @since       1.0
+ */
+public abstract class Graphics {
+
+    /** 
+     * Draws as much of the specified image as is currently available
+     * with its northwest corner at the specified coordinate (x, y).
+     * This method will return immediately in all cases, even if the
+     * entire image has not yet been scaled, dithered and converted
+     * for the current output device.
+     * <p>
+     * If the current output representation is not yet complete then
+     * the method will return false and the indicated 
+     * {@link ImageObserver} object will be notified as the
+     * conversion process progresses.
+     *
+     * @param img       the image to be drawn
+     * @param x         the x-coordinate of the northwest corner
+     *                  of the destination rectangle in pixels
+     * @param y         the y-coordinate of the northwest corner
+     *                  of the destination rectangle in pixels
+     * @param observer  the image observer to be notified as more
+     *                  of the image is converted.  May be 
+     *                  <code>null</code>
+     * @return          <code>true</code> if the image is completely 
+     *                  loaded and was painted successfully; 
+     *                  <code>false</code> otherwise.
+     * @see             Image
+     * @see             ImageObserver
+     * @since           1.0
+     */
+    public abstract boolean drawImage(Image img, int x, int y, 
+                                      ImageObserver observer);
+
+
+    /**
+     * Dispose of the system resources used by this graphics context.
+     * The Graphics context cannot be used after being disposed of.
+     * While the finalization process of the garbage collector will
+     * also dispose of the same system resources, due to the number
+     * of Graphics objects that can be created in short time frames
+     * it is preferable to manually free the associated resources
+     * using this method rather than to rely on a finalization
+     * process which may not happen for a long period of time.
+     * <p>
+     * Graphics objects which are provided as arguments to the paint
+     * and update methods of Components are automatically disposed
+     * by the system when those methods return.  Programmers should,
+     * for efficiency, call the dispose method when finished using
+     * a Graphics object only if it was created directly from a
+     * Component or another Graphics object.
+     *
+     * @see       #create(int, int, int, int)
+     * @see       #finalize()
+     * @see       Component#getGraphics()
+     * @see       Component#paint(Graphics)
+     * @see       Component#update(Graphics)
+     * @since     1.0
+     */
+    public abstract void dispose();
+
+    /**
+     * Disposes of this graphics context once it is no longer 
+     * referenced.
+     *
+     * @see       #dispose()
+     * @since     1.0
+     */
+    public void finalize() {
+        dispose();
+    }
+}
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