ASP.NET PDF Viewer using C#, VB/NET

Figure 7-18. Translating the coordinate system means moving the origin (0,0). The painter class is capable of more translations. The coordinate system can be translated, scaled, rotated, and sheared (these transformations are shown in Figure 7-19, Figure 7-20, and Figure 7-21). To scale the painter, the following call is made: painter.scale( 1.5, 2.0 ); The first parameter is the scaling along the x axis (in the horizontal direction), while the second parameter is the vertical scaling (see Figure 7-19). Notice that the pen used for painting is scaled as well the lines are higher than they are wide.

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<script src="ScriptLibrary/Atlas/Debug/Atlas.js" type="text/javascript"></script> <div> This is the Master Page.<br /> It contains this ScriptManager control:<br /> <br />

What happens if we just add that function to our FireChief and compile and run Well, it compiles, but when we run it, it still says:

Harry is putting out the fire!

It seems to have completely ignored our new function! Let s go back and have a look at that compiler output again. You ll see that although it built and ran, there s a warning (you may have to rebuild to get it to appear again; Choose Rebuild Solution from the Build menu):

Figure 7-19. Scaling the coordinate system moves all points closer to the origin (0,0). When rotating, the following call is made: painter.rotate( 30 ); The parameter is the number of degrees to rotate the coordinate system in the clockwise direction. The method accepts floating-point values, so it is possible to rotate the coordinate system any number or fraction of a degree (see Figure 7-20).

'FireChief.ExtinguishFire()' hides inherited member 'Firefighter.ExtinguishFire()'. Use the new keyword if hiding was intended.

It is a good idea to leave all your compiler warnings on and work until you are both error and warning free. That way, when something crops up unexpectedly like this, you can spot it easily, rather than burying it in a pile of stuff you re habitually ignoring.

It is telling us that, rather than replacing the implementation on the base class, our method (with matching signature) is hiding it; and that if this is what we really meant to do, we should add the keyword new to the method.

Figure 7-20. Rotating the coordinate system around the origin (0,0) The last transformation shearing is a bit more complicated. What happens is that the coordinate system is twisted around the origin. To understand this, look at Figure 7-21 and the following call: painter.shear( 0.2, 0.5 ); Notice that the larger the x value, the larger the change of the y value. In the same way, a large y value results in a large change in the x value. The first parameter of the shear method controls how large a change of the y value the x should give, and the second parameter does the same in reverse. For example, look at the lower-right corner of the sheared rectangle and compare it with the original gray box. Then compare the upper-left corner of the sheared and original rectangles. Comparing the two points, you can see that one has moved more than the other according to the size of the parameters of the shear method. Because the upper-right corner has non-0 values for both x and y, that point is moved in both directions in accordance with the parameters.

OK, let s do that:

  </div> <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components /> </page></script> <script type="text/javascript"> </script> </form> </body> </html> You can see here where the <script> tag is generated, referencing the Atlas.js core libraries. However, if this page requires using the AtlasUIGlitz library and you don t want to add a reference to that library to the template (because this page is the only one on your site that needs it), then you can use a ScriptManagerProxy control. So, if you return to the content page that was generated by the master page, you can add a ScriptManagerProxy control to it in the designer (see Figure 6-14).

public new void ExtinguishFire() { // Get our number one to put out the fire instead TellFirefighterToExtinguishFire(NumberOne); }

Compile and run again. You ll notice that we ve gotten rid of the warning, but the output hasn t changed:

Figure 7-21. Shearing the coordinate system relative to the origin (0,0) When you perform a transformation of the coordinate system of a painter, you want to know that there s a way to get the original settings back. By calling save on your painter object, the current state is placed on a stack. To restore the last saved state, call restore (this is handy when you want to apply several transformations that start from the original coordinate system). It is also common to be given a pointer to a painter object; you should save the state before modifying the painter and then restore the painter before returning from the method.

Harry is putting out the fire!

What s going on This method-hiding approach is actually letting a single object provide different implementations for the ExtinguishFire method. The implementation we get is based on the type of the variable we use, rather than the type of object to which the variable refers. You can see that happening if we use the code in Example 4-6 in our client.