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Any angle gradient (bonus: circular gradient)

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Submitted on: 12/25/2005 5:02:14 PM
By: Carles P.V. 
Level: Intermediate
User Rating: By 17 Users
Compatibility: VB 4.0 (32-bit), VB 5.0, VB 6.0
Views: 6810
 
     More gradients (last one, I hope): Now, 'any angle' gradient. // For fastest renderings, see my other post (Code ID: 60477; only for horizontal, vertical and both diagonals directions). // Last update Dec 13th, 2005: Improvements in circular gradient. SQR function completely avoided: using axis squares sum accumulators + squares sequence.

 
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Other User Comments

5/18/2005 12:54:58 PMRobert Rayment

Smart way of keeping the integer maths where it matters. Depends on processor of course, but I get the same timing as the screenshot for the optimally compiled EXE *****
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5/18/2005 1:07:48 PMCarles P.V.

Thanks Robert. Here, 2.4GHz. Oscillates between 2.5 and 3.5 ms. (approximately :-)
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5/18/2005 1:29:14 PMRobert Rayment

Mine's an AMD Athlon 1.83 GHz.
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5/18/2005 1:46:21 PMCarles P.V.

Athlon seems to be more efficient (?).
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5/18/2005 1:52:20 PMMatthew R. Usner

Carles, won't be able to download till I get home, but I'm hoping that if it doen't already do so, that this routine will allow me to specify start and end x/y coordinates within the drawing area (as opposed to simply drawing to the entire picbox, or form, or whatever hdc. If it does this helps me greatly in the project we were discussing the other day. Thanks.
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5/18/2005 2:05:19 PMCarles P.V.

Yes, it does it :-)
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5/18/2005 2:09:08 PMMatthew R. Usner

U da man


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5/18/2005 3:45:39 PMMArio Flores G

WOW!,, thanks Carles!! 5 Stars
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5/18/2005 10:35:02 PMredbird77

I bow to the master ;)

Very cool. I'm looking foward to stepping thru the code to understand the whole process.

Now if you could make it with a variable number of repeats without totally kludging up the gradient (something I never could quite get right) that would be great.

Keep up the great work.
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5/18/2005 10:36:45 PMredbird77

...and add a couple of more stars for your how-it's-done diagram :)
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5/19/2005 7:39:35 AMLight Templer

Solved forever, too. Great!
Nothing more to say ;-)
LiTe

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5/19/2005 5:01:39 PMXeon Productions

0.0023 on my Pentium 4 3.0E Ghz
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5/20/2005 2:31:39 AMJustin Yates

Nice work.
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6/1/2005 5:48:35 PMAlfred

Well done! P4 3.4GHz: between 1.6 and 1.9 ms.
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6/1/2005 6:24:22 PMAlfred

Ehhm - Your solution is faster than the measurements indicates. The time measurements could be more precise: First check the DLL-Call time and then substract the value from the results. More evident: Read the result directly in a module level variable; do NOT embed the elapsed-call into a nested VB construct. In general: Implement the Queryperformance API in the calling module to avoid the border crossing overhead.
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10/4/2006 2:09:54 AMT Jackson

In terms of resolution, how accurate is this timing class?
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10/4/2006 9:15:36 AMT Jackson

Very fast, I have it in a continous loop. Gets called about 10 times a second. Game must be compiled now though. Still smooth to play.
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