Was just watching the video from back in May by Chris Pruett. He had a
performance slide comparing canvas to opengl and as he noted there, canvas
is much slower. I am sure you know this, but getting 30fps on a Canvas with
more than a dozen or so sprites might be difficult when you factor in game
logic, collision detections, etc. I didn't realize you were running this on
the emulator as well. For sure you'll see much faster fps on a real device.
On Tue, Jan 19, 2010 at 10:55 PM, Dan Sherman <impact...@gmail.com> wrote:
> > I run my app on emulator, and currently have
> > not tested it on real device.
>
> The emulator is not, in any way, going to run the same speed as a real
> device.
>
> Run it on a real device and see what FPS you get. Or if you want, publish
> an APK and someone here will run it I'm sure (I'll do it =P)
>
> - Dan
>
> On Wed, Jan 20, 2010 at 1:44 AM, Andre <andranik.abra...@gmail.com> wrote:
>
>> Hi,
>>
>> Yesterday, I've changed my code, to work with the matrix more
>> effectively...
>>
>> My GameEntity class now looks like this:
>>
>> ----------GAME ENTITY----------
>>
>> public class GameEntity {
>> public Bitmap mBitmap;
>> private Rect mBounds;
>> private Matrix mMatrix;
>> public int mWidth;
>> public int mHeight;
>> public boolean mAlive;
>> public float mX, mY;
>> public float mVelocityX, mVelocityY;
>> public float mMoveAngle, mFaceAngle;
>> public float mRotationVelocity;
>>
>> public GameEntity(Bitmap bitmap) {
>> mBitmap = bitmap;
>> mBounds = new Rect();
>> mMatrix = new Matrix();
>> mWidth = bitmap.getWidth();
>> mHeight = bitmap.getHeight();
>> mAlive = false;
>> mX = 0.0f;
>> mY = 0.0f;
>> mVelocityX = 0.0f;
>> mVelocityY = 0.0f;
>> mMoveAngle = 0.0f;
>> mFaceAngle = 0.0f;
>> mRotationVelocity = 0.0f;
>> }
>>
>> public void draw(Canvas canvas, float angle) {
>> Matrix m = mMatrix;
>> m.reset();
>> m.postTranslate(mX - mWidth / 2, mY - mHeight / 2);
>> m.postRotate(angle, mX, mY);
>> canvas.drawBitmap(mBitmap, m, null);
>> }
>>
>> public Rect getBounds() {
>> mBounds.left = (int)(mX - mWidth / 2);
>> mBounds.top = (int)(mY - mHeight / 2);
>> mBounds.right = (int)(mX + mWidth / 2);
>> mBounds.bottom = (int)(mY + mHeight / 2);
>> return mBounds;
>> }
>> }
>>
>> And "draw" methods in GameView class:
>>
>> ----------GAME VIEW----------
>>
>> private void drawSpaceship(Canvas canvas) {
>> mSpaceship.draw(canvas, mSpaceship.mFaceAngle);
>> }
>>
>> private void drawAsteroids(Canvas canvas) {
>> GameEntity[] asteroids = mAsteroids;
>> GameEntity asteroid;
>> for(int i = 0; i < MAX_ASTEROIDS; i++) {
>> asteroid = asteroids[i];
>> if(asteroid.mAlive) {
>> asteroid.draw(canvas, asteroid.mMoveAngle);
>> }
>> }
>> }
>>
>> private void drawBullets(Canvas canvas) {
>> GameEntity[] bullets = mBullets;
>> GameEntity bullet;
>> for(int i = 0; i < MAX_BULLETS; i++) {
>> bullet = bullets[i];
>> if(bullet.mAlive) {
>> bullet.draw(canvas, bullet.mMoveAngle + 90);
>> }
>> }
>> }
>>
>> This gives me an extra 4-5 FPS, and now I have ~25 FPS.
>> It worth to mention, that I run my app on emulator, and currently have
>> not tested it on real device.
>>
>> I decide to go little further with testing and commented out
>> m.postTranslate() method call, and got +4 FPS, after that I commented
>> out m.postRotate(), and got +12-15 FPS, it seems that rotation (with
>> pivot points) is very costly...
>>
>> Best Regards, Andre
>>
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>
>
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