SetImageMask() and HandsOnAGK2 BASIC

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vitp4145

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Posted: 16th Apr 2017 10:46

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Hi everyone,

I am hoping someone can point me in the right direction here.

Using Alistair Stewart's very useful guide to AGK2 BASIC, I have come across an issue that I cannot resolve.

In his sample listing, "JigsawPiece" (p702-703) use is made of the function call SetImageMask(). Using his supplied sample images, I have keyed in the code and I get nothing. Just a blank white rectangle.

If I substitute a ,jpg or .png file as the original file, that image will show in the app window, but the jigsaw mask doesn't work.

This is the line I am using, exactly as shown in the book.

SetImageMask( game.images[1], game.images[2] ,4, 4,0 ,0 )

I have tried this in the latest version on Steam and nothing.

Is it that the images supplied with the listing are faulty? Is this a known bug in AGK2 BASIC?

I want to make use of the feature in an applicatuion I am developing and I have been unable to find any help via the AGK2 documentation files. Cany anyone give me a heads up on this?

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BatVink

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Posted: 16th Apr 2017 15:31

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I haven't seen the code you are referring to, but here is another example I created that requires masks...

https://forum.thegamecreators.com/thread/218449

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vitp4145

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Posted: 16th Apr 2017 19:22

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The code is taken (literally from Alistair Stewart's AGK2 BASIC Tutorial Guide). So far, all the example listings given that use SetMaskImage() do not work. I get a black and white rectangle with a red cross in it or just an empty white rectangle.

Here's the code:

+ Code Snippet

// Project: JigsawPiece 
// Created: 2017-04-15

#include "CoreLibrary.agc"

type imgType
	images as integer[ 2 ]
	flowerSpr as integer
endtype

global img as imgType

// main program

initialiseScreen( 1000, 750, "Jigsaw Piece", 0xA27000, %1111 )

loadResources()

createInitialLayout()

do
	Sync()
loop

// functions

function loadResources()
	img.images[ 1 ] = LoadImage( "Clematispiece.bmp" )
	img.images[ 2 ] = LoadImage( "Jigsawpiece.bmp" )
endfunction

function createInitialLayout()
	SetImageMask( img.images[ 1 ], img.images[ 2 ], 4, 4, 0, 0 )
	
	img.flowerSpr = CreateSprite( img.images[ 1 ] )
	
	SetSpriteSize( img.flowerSpr, 25, -1 )
	SetSpritePosition( img.flowerSpr, 5, 5 )
endfunction

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vitp4145

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Posted: 17th Apr 2017 17:00

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Update:

It appears SetImageMask is not the issue at all.

It never occured to me that AGK2 wouldn't load *.bmp files, but sure enough, no bitmap files at all will load. So, it is only .jpg and .png that will load successfully on my AGK2 in Windows.

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Alistair

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Posted: 18th Apr 2017 12:17

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When the book was first written AGK2 handled BMP files. Unfortunately, it no longer does. I'll change this section of the book during the next update (around June).

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Phaelax

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Posted: 18th Apr 2017 13:48

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For what possible reason would they remove support for a format if it was already there?

"I like offending people, because I think people who get offended should be offended." - Linus Torvalds

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Mobiius

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Posted: 18th Apr 2017 13:51 Edited at: 18th Apr 2017 13:52

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Filesizes?
The image processing library no longer supports BMPs ?
Mobile devices don't support BMPs so it was dropped for cross compatibility?
"Ancient Aliens"

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Paul Johnston

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Posted: 18th Apr 2017 15:44 Edited at: 18th Apr 2017 22:56

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Quote: "For what possible reason would they remove support for a format if it was already there?"

Devices used to use the platform provided methods for loading images, which meant JPG, PNG, plus a load of others depending on the platform. Except on Android, which didn't have access to the platform functions from C++, so it used the libJPEG and libPNG libraries, limiting it to JPG and PNG. All the other platforms have now also migrated to using libJPEG and libPNG for their image loading so they now have the same limitation. Since BMP doesn't offer anything that PNG can't provide no time was given to supporting a BMP loader.

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