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(x, y) is a point on the display (u,v) is a point on the image Let s assume for this discussion that (x,y) starts at (0,0) in the upper left of the screen, increasing x to the right, and y to the bottom. In this example, you will use the full dimensions of the iPhone in portrait mode, where the upper left is (0,0) and the lower right is (320,480). See Figure 6 8. The (u,v) coordinate of an image has a similar coordinate system, starting at (0,0) in the upper left of the image, and continuing to the right until you reach the width w of an image, continuing to the bottom until you reach the height h the image. But, the values of (u,v) are normalized.

Type -----------VARCHAR2(30) VARCHAR2(30) VARCHAR2(1) NOT NULL VARCHAR2(30) LONG VARCHAR2(30) VARCHAR2(30) VARCHAR2(9) VARCHAR2(8) VARCHAR2(14) VARCHAR2(9) VARCHAR2(13) VARCHAR2(14) VARCHAR2(3) VARCHAR2(4) DATE VARCHAR2(30) VARCHAR2(30) VARCHAR2(7) VARCHAR2(14)

Summary

(u,v) Image (u,v)

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By executing some test queries, it becomes apparent which columns of the USER_CONSTRAINTS view you need. Let s look at a first attempt to generate the ALTER TABLE commands. Solution 11-4a. First Attempt to Generate the Correct SQL SQL> select 'ALTER TABLE '||table_name||' DISABLE CONSTRAINT 2 '||constraint_name||';' 3 from user_constraints; However, if you capture the output from this query in a script file and execute it, you will discover that there is room for improvement. Some ALTER TABLE commands may fail with the following message: ORA-02297: cannot disable constraint (BOOK.xxx) - dependencies exist You can fix this problem in two ways: Add the CASCADE keyword to the generated ALTER TABLE commands. Sort the ALTER TABLE commands in such a way that all primary keys are disabled before the foreign key constraints.

Let s implement both fixes. Also, let s add a WHERE clause to the query to avoid generating ALTER TABLE commands for constraints that are disabled already. Solution 11-4b. Second Attempt to Generate the Correct SQL SQL> 2 3 4 5 6 7 select 'ALTER TABLE '||table_name ||' DISABLE CONSTRAINT '||constraint_name ||' CASCADE;' from user_constraints where status <> 'DISABLED' order by case constraint_type when 'P' then 1 else 2 end;

So there you have it: a complete guide to disassembling your Robosapien, the cornerstone of any Robosapien hacking project. Just make sure when you put it all back together to run the diagnostic routines to make sure that you didn t inadvertently disconnect a wire when you were poking around inside.

(x,y) y=419 Display (x,y)

Finally, now that you are satisfied with the result of the query, you add the appropriate SQL*Plus commands to capture and execute the query result. The final script looks like the following. Solution 11-4c. SQL*Plus Script to Disable All Constraints of a Schema set pagesize 0 verify off feedback off trimspool on spool doit.sql replace select 'ALTER TABLE '||table_name|| ' DISABLE CONSTRAINT '||constraint_name||' CASCADE;' from user_constraints where status <> 'DISABLED' order by case constraint_type when 'P' then 1 else 2 end; spool off @doit exit You can build many useful SQL*Plus scripts, once you have discovered how you can use SQL*Plus as a command generator.

You may recall that normalization maps an interval of numbers to the range [0,1]. The value u, which represents a point along the horizontal axis, starts at 0.0 and progresses to 1.0 for the entire width w. For example, 0.5 represents halfway across the image, 0.25 is one quarter from the left, 0.75 is one quarter from the right. The value v, which represents a point along the vertical axis, starts at 0.0 at top and progresses to 1.0 at the bottom height h. Texture mapping takes a piece of an image as defined in (u,v) coordinates, then maps the bits in the image to (x,y) coordinates on the screen. In Figure 6 8, you see the letter G in (u,v) space being mapped to a different location on the iPhone screen (x,y). This operation is quite fast and accelerated by the graphics processing unit or GPU. OpenGL will automatically scale and transform the image bits in hardware to maintain a fast frame rate. So to recap, (x,y) is a point on the display screen, and (u,v) is a point on your image. I ll be referring to these throughout the rest of the chapter. Feel free to come back and review this section if you get lost. Now, on to the app.

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