.NET/ASP.NET/C#/VB.NET PDF Document SDK

package org.shanky.hessian; public interface StringManipulator { public String joinString(String firstString, String secondString) ; public String reverseString (String sourceString) ; }

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Like the GIMP and Inkscape, Synfig Studio works with layers; but in this program, each object gets its own layer. This can result in a lot of layers being created! Each layer has a set of parameters that define how it behaves, including distorting or modifying the layer below it. To create a background to sit behind your bouncing ball, you need to first choose the color and then create a new layer. In the Synfig Studio toolbox menus, select File Panels Layers. A small window pops up, which you may need to resize to see properly particularly the Cut, Copy, and Paste buttons on the right. (You can do this by mousing over the lower-right corner of the window and then clicking and dragging out the corner using the diagonal arrow cursor.) To fill the background of the animation, click the background square of the Color Picker in the Synfig Studio Toolbox (it s a white rectangle by default, just to the right of and below the black foreground Color Picker). This Colors dialog is simpler than the equivalent windows in the GIMP or Inkscape you only get to choose colors by their RGB or YUV values (see Figure 5-23). You can also set the alpha channel (which corresponds to the degree of transparency). Now, use the double-headed arrow icon next to the Color Picker rectangles to flip the background color you selected to the foreground. This action keeps the previous foreground color ready to be flipped back again, so you have two colors saved at all times.

There are several reasons for this state of affairs, but one of the biggest is that it (object terminology, I mean) seems never to make the absolutely crucial distinction between values and variables (In fact, in our own work on type inheritance, Hugh Darwen and I found it necessary to distinguish two kinds of substitutability, one based on values and the other based on variables; what s more, we showed that if you fail to make that distinction, then at least one, and arguably as many as four, extremely undesirable consequences follow I ll elaborate on this point later) Anyway (I said to myself as I was reading), perhaps the Liskov/Wing paper does deal with the substitutability issue properly and does avoid the many value vs variable traps and confusions We ll see Meanwhile, I was still studying the Tockey article.

The corresponding implementation class would look like this:

The very next thing it said was this: Very simply put, the LSP states that objects of the subtype ought to behave the same as those of the supertype as far as anyone or any program using supertype objects can tell In other words, I ought to be able to substitute any subtype of class X in a program that expects a member of class X and the program should still behave reasonably As I expected: Fuzziness! Let s examine the two sentences in this quote one at a time.

package org.shanky.hessian; public class StringManipulatorImpl extends HessianServlet implements StringManipulator { public String joinString(String firstString, String secondString) { return firstString + secondString; } public String reverseString (String sourceString) {

Figure 5-23. The Colors window allows you to set RGB, YUV, and alpha values. The only layer listed in the Layers window is called something like Circle001. Right-click this layer name, and select New Layer from the pop-up menu that appears. Try New Layer Geometry Solid Color to start with; this option creates a layer that fills the whole canvas with the current foreground color. Lots of ready-made effects are available on the New Layer menu, from distortions and blurs to fractals. Two layers are now listed in the Layers window (see Figure 5-24). You can toggle the visibility of each layer using the check box at far left. Either layer should become highlighted in pale orange if you click to select it, after which you can use the buttons along the bottom of the window to manipulate the layer in question. If your background ends up in front of your bouncing ball, use the Raise Layer or Lower Layer button in the Layers window to get things in order.