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
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