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attached to the same message with the Earth Distance patches. Recent changes include changing the subscript in one place I forgot in the previous bugfix patch. A couple of added regression tests, which should help catch this mistake if it reappears. I also put in a limit of 100 dimensions in cube_large and cube_in to prevent making it easy to create very large cubes. Changing one define in cubedata.h will raise the limit if some needs more dimensions. Bruno Wolff III
107 lines
4.4 KiB
Plaintext
107 lines
4.4 KiB
Plaintext
Changes that were made in August/September 2002 by Bruno Wolff III.
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Note that this was based on a 7.3 development version and changes may not
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directly work with earlier versions.
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I fixed a bug in cubescan.pl that prevented signed numbers with no digits
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before a decimal point from being accepted. This was submitted as a separate
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patch and may already be applied.
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cube_inter should really return NULL if the two cubes don't overlap. However
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this requires changing to the new calling sequence and I don't know enough
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about how to do it to make the change.
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I changed all floats to doubles except for g_cube_penalty which I don't
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think can be changed to return double. This might cause the penalty to
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overflow sooner than one might expect, but overflow could have happened
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even with floats.
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I changed the output format (in cube_out) to use %.16g instead of %g, since the
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default is only 6 digits of precision.
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I changed all of the functions declared with (isstrict) to use the current
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method of declaring this.
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I changed all of the externally visible functions to be immutable which
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they are. I don't think this matters for the gist functions and didn't
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try to declare them immutable in case there was something tricky about them
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that I don't understand.
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I changed the regression tests to use some larger exponents to test output
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in exponential form. 1e7 was too small for this.
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I added some regression tests to check for 16 digits of precision. This
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may or may not be a good idea.
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I got rid of the swap_corners function. It created scratch boxes that
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were iterated through and deleted. This is slower than just getting the
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larger or smaller coordinate as needed, since swap_corners was doing the
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same thing with the overhead of a function call and memory allocation.
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I added memset calls to zero out newly allocated NDBOXes as the documentation
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on functions indicates should be done. This still doesn't allow a hash
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index for equality since there are multiple representations of the
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same cube.
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I got rid of a call to cube_same in cube_lt and cube_gt since the test
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was redundant with other checks being made. The call to cube_same would
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only be faster if most of the time you were comparing equivalent cubes.
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In cube_lt and cube_gt, the second (UR) for loop for comparing
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extra coordinates to 0 had the wrong range.
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Note that the cube_distance function wasn't mentioned in the README.cube file.
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I added regression tests for the cube_distance function.
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I added the following new functions:
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cube
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cube_dim
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cube_ll_coord
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cube_ur_coord
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cube_is_point
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cube_enlarge
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cube takes text input and returns a cube. This is useful for making cubes
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from computed strings.
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cube_dim returns the number of dimensions stored in the the data structure
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for a cube. This is useful for constraints on the dimensions of a cube.
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cube_ll_coord returns the nth coordinate value for the lower left corner
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of a cube. This is useful for doing coordinate transformations.
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cube_ur_coord returns the nth coordinate value for the upper right corner
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of a cube. This is useful for doing coordinate transformations.
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cube_is_point returns true if a cube is also a point. This is true when the
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two defining corners are the same.
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cube_enlarge increases the size of a cube by a specified radius in at least
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n dimensions. If the radius is negative the box is shrunk instead. This
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is useful for creating bounding boxes around a point for searching for
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nearby points. All defined dimensions are changed by the radius. If n
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is greater than the number of defined dimensions and the cube is being
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increased (r >= 0) then 0 is used as the base for the extra coordinates.
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LL coordinates are decreased by r and UR coordinates are increased by r. If a
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LL coordinate is increased to larger than the corresponding UR coordinate
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(this can only happen when r < 0) than both coordinates are set to their
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average.
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I added regression tests for the new functions.
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I added documentation for cube_distance and the new functions to README.cube
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as well as making a few other minor changes.
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I changed create function to create or replace function in the install
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script.
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I limited the number of dimensions allowed in cube_enlarge and cube_in
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to 100 to make it harder for people to mess up the database. The constant
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is defined in cubedata.h and can be increased if you need something larger.
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I added grant statements to the install script to make the functions
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executable to everyone.
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Bruno Wolff III <bruno@wolff.to>
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