thx for the reply
how about the rotating? is it like scaling?
On Jun 22, 11:13 pm, Romain Guy <romain...@google.com> wrote:
> Hi,
> This is actually normal. Scaling fonts does not necessarily lead to a linear
> effect. Based on the font size, the text renderer can (and will) change the
> spacing, the antialiasing, etc. to improve on readability. If you want to
> scale text linearly you should turn the text into a bitmap first. If your
> animation is implemented using Views, you can simply enabled the drawing
> cache of the animated view.
>
>
>
> On Mon, Jun 22, 2009 at 8:46 AM, sleith <raysle...@gmail.com> wrote:
>
> > hi, i'm trying to animate text, but strange behavior happened when i
> > tried to rotate and scale.
> > When rotating, the text width becoming wider and narrower randomly
> > When scaling, the text y position is going upper.
> > i've test with image, but image works perfectly. don't know why text
> > is not.
> > Here's my code, please take a look or run it (only one file is enough
> > to run the demo)
> > thanks
>
> > public class TestDraw extends Activity {
> > /** Called when the activity is first created. */
> > �...@override
> > public void onCreate(Bundle savedInstanceState) {
> > super.onCreate(savedInstanceState);
>
> > FrameLayout flContent = new FrameLayout(this);
> > flContent.setLayoutParams(new
> > LayoutParams(LayoutParams.FILL_PARENT,
> > LayoutParams.FILL_PARENT));
> > setContentView(flContent);
>
> > SurfaceView svPreviewer = new SurfaceDrawer(this);
> > svPreviewer.setLayoutParams(new LayoutParams
> > (LayoutParams.FILL_PARENT,
> > LayoutParams.FILL_PARENT));
>
> > flContent.addView(svPreviewer);
> > }
>
> > private class SurfaceDrawer extends SurfaceView implements
> > SurfaceHolder.Callback, Runnable {
>
> > private SurfaceHolder mSurfaceHolder;
> > private int mLayoutWidth;
> > private int mLayoutHeight;
>
> > private String mText = "Hello World! Hello Android!";
> > private Paint mFontPaint = new Paint();
> > private Paint mBackgroundPaint = new Paint();
> > private Rect mBackgroundRect = new Rect();
>
> > // thread
> > private Thread mThread;
> > private boolean mIsStopped = false;
> > private boolean mIsRunningMode = false;
> > private Lock mLock = new ReentrantLock();
> > private Condition mCond = mLock.newCondition();
>
> > public SurfaceDrawer(Context context) {
> > super(context);
> > mSurfaceHolder = getHolder();
> > mSurfaceHolder.addCallback(this);
>
> > mFontPaint.setColor(Color.WHITE);
> > mBackgroundPaint.setColor(Color.MAGENTA);
>
> > // set the rect for background
> > mFontPaint.getTextBounds(mText, 0, mText.length(),
> > mBackgroundRect);
>
> > mThread = new Thread(this);
> > mThread.start();
> > }
>
> > public void surfaceChanged(SurfaceHolder holder, int format,
> > int
> > width,
> > int height) {
> > mLayoutWidth = width;
> > mLayoutHeight = height;
>
> > mLock.lock();
> > mIsRunningMode = true;
> > mCond.signal();
> > mLock.unlock();
> > }
>
> > public void surfaceCreated(SurfaceHolder holder) {
> > }
>
> > public void surfaceDestroyed(SurfaceHolder holder) {
> > mLock.lock();
> > mIsStopped = true;
> > mIsRunningMode = false;
> > mCond.signal();
> > mLock.unlock();
>
> > try {
> > mThread.join();
> > } catch (Exception e) {
>
> > }
> > }
>
> > public void run() {
> > while (mIsStopped == false) {
> > mLock.lock();
>
> > try {
> > while (mIsRunningMode == false) {
> > mCond.await();
> > }
> > if (mIsStopped == true) {
> > mLock.unlock();
> > break;
> > }
>
> > DrawRotationAnimation();
> > DrawScalingAnimation();
>
> > } catch (InterruptedException e) {
> > e.printStackTrace();
> > }
>
> > mLock.unlock();
> > }
> > }
>
> > public void DrawRotationAnimation() {
> > Canvas c;
> > int centerX = mLayoutWidth / 2;
> > int centerY = mLayoutHeight / 2;
> > for (int i = 0; i < 360; i += 20) {
> > c = mSurfaceHolder.lockCanvas();
> > c.save();
>
> > c.rotate(i, centerX, centerY);
> > c.translate(centerX -
> > (mBackgroundRect.width() / 2), centerY
> > - (mBackgroundRect.height()
> > / 2));
>
> > c.drawColor(Color.BLACK);
> > c.drawRect(mBackgroundRect,
> > mBackgroundPaint);
> > c.drawText(mText, 0, 0, mFontPaint);
>
> > c.restore();
> > mSurfaceHolder.unlockCanvasAndPost(c);
> > SystemClock.sleep(300);
> > }
> > }
>
> > public void DrawScalingAnimation() {
> > Canvas c;
> > int centerX = mLayoutWidth / 2;
> > int centerY = mLayoutHeight / 2;
> > for (float scale = 1; scale < 3; scale += 0.2) {
> > c = mSurfaceHolder.lockCanvas();
> > c.save();
>
> > c.scale(scale, scale, centerX, centerY);
> > c.translate(centerX -
> > (mBackgroundRect.width() / 2), centerY
> > - (mBackgroundRect.height()
> > / 2));
>
> > c.drawColor(Color.BLACK);
> > c.drawRect(mBackgroundRect,
> > mBackgroundPaint);
> > c.drawText(mText, 0, 0, mFontPaint);
>
> > c.restore();
> > mSurfaceHolder.unlockCanvasAndPost(c);
> > SystemClock.sleep(300);
> > }
> > }
>
> > }
> > }
>
> --
> Romain Guy
> Android framework engineer
> romain...@android.com
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support. All such questions should be posted on public
> forums, where I and others can see and answer them
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