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DarkBASIC Professional Discussion / Editing a bitmap?

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Peter H
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Posted: 25th Aug 2004 06:45 Edited at: 25th Aug 2004 06:55
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Hy!

i'm making a scorched earth re-make and was wondering if there is a way to edit a bitmap?

i need to do this so that when i draw the terrain i don't have to draw EVERY SINGLE PIXEL INDIVIDUALLY!

[edit] i just found the "make bitmap from memblock" command and it looks promising...but i don't know the exact commands to use memblocks and that command to essentially "edit"(or just destroy and re-create) a bitmap...

[edit2] okay i found the "make memblock from bitmap" command and now i need to know how to get info from the memblock and edit it...(all i need to do is change pixel color values...)

anyway thanks in advance!

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Posted: 25th Aug 2004 07:29
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er. why not use the 2D drawing commands?, you can draw circles, lines and boxes, plot pixels etc, if you use lock pixels before you do any drawing then they are quite fast, if you are planning a realtime deformable landscape then they should be able to manage that.
As for the memblocks, if you are in 32 bit mode for the bitmap then you have a byte for alpha, a byte for red, a byte for green and a byte for blue, so four bytes make a pixel (I think it`s argb format anyway, someone will correct me if I am wrong), just read the pixels from left to right and go down a line every xx pixels where xx is the width of the bitmap, CattleRustler did some work on effects using memblocks, you might like to ask him.

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IanM
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Posted: 25th Aug 2004 07:35
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You could just use a filled circle of background colour to erase some of the landscape. I posted a filled circle command to CodeBase some time ago that you could use.

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Peter H
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Posted: 25th Aug 2004 07:39 Edited at: 25th Aug 2004 07:42
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so what exactly does the "lock pixels" command do?

anyway thanks for the help

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spooky
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Posted: 25th Aug 2004 08:25
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You might want to take a look at this recent post which does some clever tricks with pixels and memblocks.

http://forum.thegamecreators.com/?m=forum_view&t=37695&b=4


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Peter H
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Posted: 25th Aug 2004 08:35
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interesting thread...

but i've run into a problem when i use "cls" and then use the "dot" command to put pixels where i want them, then use the sync command..all i get is a black screen...

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Peter H
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Posted: 25th Aug 2004 09:02 Edited at: 25th Aug 2004 09:28
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never mind..by using the lock pixels command before my editing and the unlock pixels command after my editing i've managed to get the FPS way up!

expect a demo soon!

like as in 2 minutes! lol...just had to fix one bug...

ok here is the link-
http://www.wakehosting.com/upload/files/OmCYdrgo/Scorched%20earth.zip
use the mouseclick to make explosions...
note: you can't do anything until the "loaded" text appears...

i will be adding sound effects and tanks(or something else) and explosion graphics...also the level was whipped up in paint but i can use any image that has black for the sky...

but i just started working on this last night so i'm pleased with myself

will move this to WIP soon...

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