Hi all!
I want to do an animation using a drawable and a surface view. I've
tried with a View, but actually it runs really slow, so i tested with
surface view, but i can see no changes (as slow as using a view). What
i do is:
set a PolyToPoly matrix
concat that matrix
draw a bitmap
and repeat that until the animation has stopped.
This is the code:
private void doDraw(Canvas canvas) {
Paint paint = mPaint;
canvas.drawColor(Color.BLACK);
canvas.save();
canvas.translate(getWidth() / 2, 20);
canvas.restore();
if (isTurningLeft) {
doDrawLeft(canvas, new float array);
flipLeft();
} else if (isTurningRight) {
doDrawRight(canvas, new float array);
flipRight();
} else {
doDrawStable(canvas);
}
}
private void doDrawStable(Canvas canvas) {
canvas.save();
canvas.drawBitmap(_bd, null, new RectF(0, 0, 160, 240),
mPaint);
canvas.restore();
}
private void doDrawLeft(Canvas canvas, float dst[]) {
canvas.save();
mMatrix.setPolyToPoly(initPos, 0, dst, 0, dst.length >>
1);
canvas.concat(mMatrix);
canvas.drawBitmap(_bd, null, new RectF(0, 0, 160, 240),
mPaint);
canvas.restore();
}
private void doDrawRight(Canvas canvas, float dst[]) {
canvas.save();
mMatrix.setPolyToPoly(initPos, 0, flippedPos, 0,
dst.length >> 1);
canvas.concat(mMatrix);
mMatrix.setPolyToPoly(flippedPos, 0, dst, 0, dst.length
>> 1);
canvas.concat(mMatrix);
canvas.drawBitmap(_bd, null, new RectF(0, 0, 160, 240),
mPaint);
canvas.restore();
}
public void flipLeft() {
//set new values to x,y,i
//stop the animation if we have finished
}
public void flipRight() {
//set new values to x,y,i
//stop the animation if we have finished
}
Finally, we have this inside the thread:
@Override
public void run() {
while (mRun) {
Canvas c = null;
try {
c = mSurfaceHolder.lockCanvas(null);
synchronized (mSurfaceHolder) {
doDraw(c);
}
} finally {
// do this in a finally so that if an
exception is thrown
// during the above, we don't leave the
Surface in an
// inconsistent state
if (c != null) {
mSurfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
It runs really slow!! Am I missing something?
Any help is much appreciated :)
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