take a look at this talk
http://code.google.com/events/io/sessions/WritingRealTimeGamesAndroid.html
He has a bunch of slides comparing various methods for rendering 2d
sprite type objects.
On Jun 24, 6:39 pm, Chris Stockton <chrisstockto...@gmail.com> wrote:
> Hello,
>
> I am faced with a challenge of drawing destructable terrain. My current and
> surely naive approach is as follows. Excuse formatting, posting from my g1
> and don't have the code with me so the math in the rectf might be wrong be
> advised, but it does work, visually; it is just a fps nerf.
>
> Terrain is 720 px wide, terrain square is 4px, worst case total terrain
> columns to be drawn is 720/4 = 180, currently I draw a 4x4 bitmap, using the
> rectf arg to stretch/transform its height.
>
> [code]
> Static public float[] mapUpperBounds = ... 25.0f, 27.0f. 29.0f ... 150.0f,
> 148.0f ... 1.0f
> Static public Rect mSourceRect = new Rect(0, 0, 4, 4);
> ...
> For(int I = 0; I < 180; i++) {
> // call my graphics lib, if opengl is avail
> // it transforms the request into a matrix
> // and draws it in a way identical to canvas
> G.drawBitmap(handle, mRectSource, new RectF(
> // each float is the upper boundary,
> // with a width of 4 I just slowly
> // crawl across the map from left to right
> I*4,
>
> // we strech the bitmap from the
> // upper boundary down to the
> // bottom of the map
> canvasHeight - mapUpperBounds[I],
> canvasWidth - ((I*4)+4),
> mapUpperBounds[I]
> )
> );}
>
> [/code]
>
> My thoughts :
> -180 calls to the graphics lib is crazy furthermore the fact I draw a bitmap
> might be bad too.
> -Drawline perhaps is cheaper? Haven't tried it yet just came to mind
> -when zoomed in closely this becomes more and more trival, I won't render if
> it is out of the view point.
> -Have the background image contain the 'tiles' and chunk into it as the
> terrain explodes? Math might be a little complex, but if all explosions were
> circular might be cheaper, question is how expensive is drawCircle (or
> whatever method would be appropiate, I could see up to 400+ exploisons per
> game)
>
> I'm sure this problem has been solved before, just not by me :P thank you
> for your patience.
>
> Regards,
>
> -Chris
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers-unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
-~----------~----~----~----~------~----~------~--~---
