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POIn terms of OO design, can two-d and the three-d point classes be derived from single base class?
 

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  1. POIn terms of OO design, can two-d and the three-d point classes be derived from single base class?
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    <p>I`m currently working out the design for simple graphic editor, who support trivial operations for two-dimensional and three-d shapes.<br> The point is, I want to render prototype of these shapes, as MsPaint does. And at the moment it is rendering I need to store somewhere pixels from the canvas which get covered by prototype, just in case when prototype changes to restore their state on the canvas. So, I want all my shapes to support this kind of buffering (Graphic Operation is the base class for all rendering operations):</p> <pre><code>public abstract class Shape: GraphicOperation { protected List&lt;SomePoint&gt; backup; public Shape(Color c): base(c) { } public Color FigureColor { get { return color; } protected set { color = value; } } public abstract void renderPrototype(Bitmap canvasToDrawOn); } </code></pre> <p><br> The main idea is that in terms of OO design it would be great to provide the support of the buffer on base class (Shape) level, I mean for TwoDShape and ThreeDShape classes this list must be initialized in different way - for TwoDShape with TwoDPoint instances, and for ThreeDShape with ThreeDPoint instances.<br> But to do this, <b>SomePoint must be base class for both</b> two-dimensional point and three-dimensional point classes. <b>Is it acceptable in terms of OO to derive both these classes from single base class?</b><br> May be there are too many words, but I just wanted the problem to be clear for everyone.<br> <b>Edit</b>: btw, is this the good idea to derive point classes from their king of shapes? I personally see no other options, but may be it would be better if I derive it directly from shape? Now it is:<br></p> <pre><code>public abstract class TwoDShape : Shape { protected List&lt;SomePoint&gt; backup; public TwoDShape(Color c) : base(c) { } } public class TwoDPoint: TwoDShape { //... } </code></pre> <p>and the same is for ThreeDPoint.</p>
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