Привет всем. Пытаюсь сделать медленное рисование линии, а получается наоборот - медленное исчезание. Что делаю не так?
| Код |
private static class SampleView extends View {
private Paint followingPaint;
private Path mPath = new Path();
private PathEffect mEffect;
private float mPhase;
private PathMeasure pm;
private float pmLen;
private float fSegmentLen;
private static Bitmap bmSprite;
public SampleView(Context context) {
super(context);
setFocusable(true);
setFocusableInTouchMode(true);
setBackgroundColor(Color.TRANSPARENT);
followingPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
followingPaint.setStyle(Paint.Style.STROKE);
followingPaint.setStrokeWidth(2);
mPath.moveTo(100, 100);
mPath.lineTo(100, 100);
mPath.lineTo(300, 100);
mPath.lineTo(300, 300);
mPath.lineTo(350, 350);
pm = new PathMeasure(mPath, false);
pmLen = pm.getLength();
if (bmSprite == null)
bmSprite = BitmapFactory.decodeResource(getResources(),
R.drawable.feed_liked_arrow);
fSegmentLen = pm.getLength() / iMaxAnimationStep;
}
private static int iMaxAnimationStep = 80;
private int iCurStep = 0;
@Override
protected void onDraw(Canvas canvas) {
mEffect = new DashPathEffect(new float[] { pmLen, pmLen },
-fSegmentLen * iCurStep);
if (iCurStep <= iMaxAnimationStep) {
iCurStep++; // advance to the next step
mPhase -= 8;
}
Matrix mxTransform = new Matrix();
pm.getMatrix(fSegmentLen * iCurStep, mxTransform,
PathMeasure.POSITION_MATRIX_FLAG
+ PathMeasure.TANGENT_MATRIX_FLAG);
mxTransform.preTranslate(-bmSprite.getWidth() + 8,
-bmSprite.getHeight() + 6);
followingPaint.setPathEffect(mEffect);
followingPaint.setColor(Color.BLUE);
canvas.drawPath(mPath, followingPaint);
invalidate();
}
}
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