GameView - Another howto question

basil99 · Feb 26, 2013

Lets say, I load several images and add them to Gameview in this way

Dim gv as GameView

and

gv.BitmapsData.Add( Picture1 )
gv.BitmapsData.Add( Picture2 )
gv.BitmapsData.Add( Picture3 )
gv.BitmapsData.Add( Picture4 )
.......
gv.BitmapsData.Add( PictureN )

Then I need to "clear" Gameview and start to draw another pack of pictures:

gv.BitmapsData.Add( anotherPicture1 )
gv.BitmapsData.Add( anotherPicture2 )
gv.BitmapsData.Add( anotherPicture3 )
.......
gv.BitmapsData.Add( anotherPictureM )

So, questions are:

1) how to "clear" GameView "in one click" ? If possible ?
2) If not, I need to make calls like that:

Picture1.Delete = True
Picture2.Delete = True
Picture3.Delete = True
................
PictureN.Delete = True

then add another group of pictures ?

I tried this but by some reason I can't add picture to the gameview again if it was deleted before - nothing is displayed

3) How to remove picture from gameview list without deleting it ?

Thank you

Erel · Feb 26, 2013

1, 2)

B4X:

gv.BitmapsData.Clear

3) Setting Delete to true is equivalent to removing the picture. It doesn't "destroy" the image.

It is convenient to set Delete to true and not modify the list directly. Modifying the list directly can lead to parent For Next blocks to fail.

basil99 · Feb 27, 2013

Erel said:
1, 2)

B4X:

gv.BitmapsData.Clear

3) Setting Delete to true is equivalent to removing the picture. It doesn't "destroy" the image.

It is convenient to set Delete to true and not modify the list directly. Modifying the list directly can lead to parent For Next blocks to fail.

Ok, thanks, it works )

Juan Luis Lopez · Mar 5, 2014

i want to make something to blink but if i use .delete = true and then use .delete= false nothing appears
i tries to reload the bitmap with bitmapdata.loadbitmap but i doesnt work...
how can i do it?

Erel · Mar 5, 2014

It is better to start a new thread for a new question.

You can remove the BitmapData from the last and later add it.

Informatix · Mar 5, 2014

Juan Luis Lopez said:
i want to make something to blink but if i use .delete = true and then use .delete= false nothing appears
i tries to reload the bitmap with bitmapdata.loadbitmap but i doesnt work...
how can i do it?

Blinking effect is done by changing the alpha value (from 0 to 255, alternatively), not by creating/removing images.

Juan Luis Lopez · Mar 5, 2014

but bitmapdata hasnt an alpha property...
i found a way to do that
after deleting with bitmapdata.delete=true, i have to reload a bitmap and add it to the gameview list.
i have been reading about accelerated surface and dxlib but i found it hard.
thanks!

Informatix · Mar 6, 2014

Juan Luis Lopez said:
but bitmapdata hasnt an alpha property...

Your bitmapdata has a bitmap property containing the image to make blink. Use the AlterColors function of my Accelerated Surface library (or any similar function of another library) to change the alpha value.
EDIT: another way is to draw with a zero size destrect if the library allows that (untested). That's not ideal but it's better than creating/removing an object repeatedly.

GameView - Another howto question

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