DaniWeb IT Discussion Community

Code Snippet Fast Animation with the Windows GDI

William Hemsworth — Fri, 27 Nov 2009 20:15:57 GMT

Quite a while ago, I made this snippet. This code is basically the same, except that it adds animation.

This method of blitting is very fast assuming you don't use a surface that's too large. On a 500 x 500 surface, I managed 350fps using only 0-1% of the cpu. This snippet may appear much slower because of the amount of CPU it's applying to each pixel, but the blitting itself is very fast. Also, don't forget that an average game will only redraw parts of the window that need redrawing, this redraws the whole surface every time.

So, as long as you know what you're doing, Windows GDI isn't actually that slow :icon_lol:

Attached executable:
Attachment 12743

Preview Image:
Attachment 12744

edit: Running in Debug may reduce speed by a lot, set it as Release.

Attached Images

prev.png (135.8 KB)

Attached Files

GDI Animation.zip (32.3 KB)

Word wrap problem

William Hemsworth — Sun, 22 Nov 2009 23:33:58 GMT

Words aren't wrapping correctly, if one word exceeds the line length, you should wrap it anyway. Problem happens in my Control Panel under 'My Recently Viewed Threads' from this link.

Attached Images

Untitled.jpg (130.1 KB)

Code Snippet Conversion to any base, with a fixed number of digits

William Hemsworth — Sat, 31 Oct 2009 13:02:01 GMT

Here's a function that manually converts an integer to any base between 2 and 36, the parameter list is:

void toBase(

   int value,                // Integer value to convert

   char *target,        // Pointer to a large enough buffer

   int base,                // Base (from 2 to 36)

   int fixedDigitCount        // The minimum number of digits it must contain

);

This gives me the following output:

Quote:

Binary with no fixed number of digits (1 to 15):
1 10 11 100 101 110 111 1000 1001 1010 1011 1100 1101 1110 1111

Binary with 4 fixed digits (1 to 15):
0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111

Octal with no fixed number of digits (1 to 15):
1 2 3 4 5 6 7 10 11 12 13 14 15 16 17

Octal with 3 fixed digits (1 to 15):
001 002 003 004 005 006 007 010 011 012 013 014 015 016 017

Decimal with no fixed number of digits (1 to 15):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Decimal with 4 fixed digits (1 to 15):
0001 0002 0003 0004 0005 0006 0007 0008 0009 0010 0011 0012 0013 0014 0015

Hex with no fixed number of digits (1 to 15):
1 2 3 4 5 6 7 8 9 A B C D E F

Hex with 2 fixed digits (1 to 15):
01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

Daniweb running slow

William Hemsworth — Wed, 07 Oct 2009 16:58:57 GMT

Each page is taking me 20-30 seconds to load, it's pretty frustrating :icon_neutral:
Is there a reason for this?

Derren Brown predicts lottery results

William Hemsworth — Wed, 09 Sep 2009 23:01:20 GMT

Just watched this on TV under an hour ago.
http://www.youtube.com/watch?v=cHZ2mQczkcg

It was amazing. We switched to the channel the lottery was on, and both were live. He managed to predict the results perfectly. I don't think he used any illusions, but I will be very interested to see how he pulled off such a trick when he says how he did on friday.

Anybody got any ideas as to how you think he did it? :P