An example of using SetImageMask to create a window

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Ancient Lady

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Posted: 28th May 2012 22:22 Edited at: 28th May 2012 22:25

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This code shows how SetImageMask may be used to create a window for showing stuff.

SetPhysicsDebugOn() is used so that you can 'see' the hidden image.

I set the restitution over 1 so that the moving object gains energy.

SetVirtualResolution(800, 800)

// load the images
img_msk = LoadImage("mask.png")
img_frnt = LoadImage("simple.png")
img_back = LoadImage("simple.png")
img_sun = LoadImage("bluesun.png")

// now cut the hole
SetImageMask(img_frnt,img_msk,4,4,200,200)

// create the front screen
i_frnt = CreateSprite(img_frnt)
SetSpriteSize(i_frnt,800, 800)
SetSpriteColor(i_frnt,127,0,0,255)
SetSpritePosition(i_frnt,0,0)
SetSpriteDepth(i_frnt,10)

// create the background
i_back = CreateSprite(img_back)
SetSpriteSize(i_back,400, 800)
SetSpriteColor(i_back,255,255,0,255)
SetSpritePosition(i_back,200,0)
SetSpriteDepth(i_back,20)

// add a moving object between the two
i_sun = CreateSprite(img_sun)
SetSpriteSize(i_sun,72,72)
SetSpritePhysicsOn(i_sun,2)
SetSpriteShape(i_sun,1)
SetSpritePosition(i_sun,338,0)
SetSpriteDepth(i_sun,15)
SetSpritePhysicsDamping(i_sun,0)
SetSpritePhysicsRestitution(i_sun,1.5)
SetPhysicsDebugOn()

// and play
do
	// check for done
	if getPointerPressed()=1 then end
	Print("Touch anywhere to exit")

Sync()
loop

// clean up
DeleteSprite(i_frnt)
DeleteSprite(i_back)
DeleteSprite(i_sun)
DeleteImage(img_msk)
DeleteImage(img_frnt)
DeleteImage(img_back)
DeleteImage(img_sun)

+ Code Snippet

SetVirtualResolution(800, 800)

// load the images
img_msk = LoadImage("mask.png")
img_frnt = LoadImage("simple.png")
img_back = LoadImage("simple.png")
img_sun = LoadImage("bluesun.png")

// now cut the hole
SetImageMask(img_frnt,img_msk,4,4,200,200)

// create the front screen
i_frnt = CreateSprite(img_frnt)
SetSpriteSize(i_frnt,800, 800)
SetSpriteColor(i_frnt,127,0,0,255)
SetSpritePosition(i_frnt,0,0)
SetSpriteDepth(i_frnt,10)

// create the background
i_back = CreateSprite(img_back)
SetSpriteSize(i_back,400, 800)
SetSpriteColor(i_back,255,255,0,255)
SetSpritePosition(i_back,200,0)
SetSpriteDepth(i_back,20)

// add a moving object between the two
i_sun = CreateSprite(img_sun)
SetSpriteSize(i_sun,72,72)
SetSpritePhysicsOn(i_sun,2)
SetSpriteShape(i_sun,1)
SetSpritePosition(i_sun,338,0)
SetSpriteDepth(i_sun,15)
SetSpritePhysicsDamping(i_sun,0)
SetSpritePhysicsRestitution(i_sun,1.5)
SetPhysicsDebugOn()

// and play
do
	// check for done
	if getPointerPressed()=1 then end
	Print("Touch anywhere to exit")

	Sync()
loop

// clean up
DeleteSprite(i_frnt)
DeleteSprite(i_back)
DeleteSprite(i_sun)
DeleteImage(img_msk)
DeleteImage(img_frnt)
DeleteImage(img_back)
DeleteImage(img_sun)

Here are the images:
simple.png -

bluesun.png -

EDIT: the mask file is 'invisible', so use the download to get it.

Cheers,
Ancient Lady

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Rich Dersheimer

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Posted: 29th May 2012 05:39

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Say, if you END your program inside the loop, does it even do the cleanup code?

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Marl

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Location: Bradford, UK

Posted: 29th May 2012 06:16 Edited at: 29th May 2012 06:18

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Quote: "Say, if you END your program inside the loop, does it even do the cleanup code?"

Well spotted Rich.

She did a Switch (obscure Matrix reference) (http://en.wikipedia.org/wiki/List_of_minor_characters_in_the_Matrix_series#Switch)

She got an end when what she needed was an exit

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Rich Dersheimer

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Posted: 29th May 2012 07:27 Edited at: 29th May 2012 07:30

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Good one, Marl!

Here's another example of using SetImageMask()

Save this image as MyImg.png in the media folder. (It includes the mask AND the bricks together, the code splits them)

SetVirtualResolution(800, 600)

` load in and separate the
` bullethole and bricks
MyImg = LoadImage("MyImg.png")
BulletImg = CopyImage(MyImg, 0, 0, 64, 64)
BrickImg = CopyImage(MyImg, 64, 0, 64, 64)
SetImageWrapU(BrickImg, 1)
SetImageWrapV(BrickImg, 1)

` make the brick background
backSpr = CreateSprite(BrickImg)
SetSpriteSize(backSpr, 800, 600)
SetSpriteUVScale(backSpr, .2, .2)

` this just makes a big white
` image using no external graphics
tempSprite = CreateSprite(0)
SetSpriteSize(tempSprite, 800, 600)
Render()
WallImg = GetImage(0, 0, 640, 550)
BlankWallImg = CopyImage(WallImg, 0, 0, 640, 550)
DeleteSprite(tempSprite)
WallSprite = CreateSprite(WallImg)
SetSpritePositionByOffset(WallSprite, 400, 350)

Do
    Print("Tap to shoot")

If GetPointerPressed()
        ` clear the bulletholes
        DeleteImage(WallImg)
        CopyImage(WallImg, BlankWallImg, 0, 0, 640, 550)

` make more bulletholes
        For x = 0 to 576 Step 64
            SetImageMask(WallImg, BulletImg, 4, 4, x, Random(100, 300))
            Sync()
            t# = Timer()
            While Timer() < t# + .05
            Endwhile
        Next x
    Endif
    Sync()
Loop

+ Code Snippet

SetVirtualResolution(800, 600)

` load in and separate the
` bullethole and bricks
MyImg = LoadImage("MyImg.png")
BulletImg = CopyImage(MyImg, 0, 0, 64, 64)
BrickImg = CopyImage(MyImg, 64, 0, 64, 64)
SetImageWrapU(BrickImg, 1)
SetImageWrapV(BrickImg, 1)

` make the brick background
backSpr = CreateSprite(BrickImg)
SetSpriteSize(backSpr, 800, 600)
SetSpriteUVScale(backSpr, .2, .2)

` this just makes a big white
` image using no external graphics
tempSprite = CreateSprite(0)
SetSpriteSize(tempSprite, 800, 600)
Render()
WallImg = GetImage(0, 0, 640, 550)
BlankWallImg = CopyImage(WallImg, 0, 0, 640, 550)
DeleteSprite(tempSprite)
WallSprite = CreateSprite(WallImg)
SetSpritePositionByOffset(WallSprite, 400, 350)

Do
    Print("Tap to shoot")

    If GetPointerPressed()
        ` clear the bulletholes
        DeleteImage(WallImg)
        CopyImage(WallImg, BlankWallImg, 0, 0, 640, 550)

        ` make more bulletholes
        For x = 0 to 576 Step 64
            SetImageMask(WallImg, BulletImg, 4, 4, x, Random(100, 300))
            Sync()
            t# = Timer()
            While Timer() < t# + .05
            Endwhile
        Next x
    Endif
    Sync()
Loop

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baxslash

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Posted: 29th May 2012 10:38

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Some great examples guys, thanks for sharing!

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Ancient Lady

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Posted: 29th May 2012 17:39

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You are so right Rich.

Yup, Marl, it should have been 'exit'.

I had grabbed the print/touch bits from another piece of test code that used no media and didn't think to change it.

'Copy/Paste/Edit' can be our friend, if your remember the 'edit' part.

Cheers,
Ancient Lady

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AppGameKit Classic Chat / An example of using SetImageMask to create a window

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