how to add small circle at the edge of arc.
and it should be also move with arc edge in the clock direction.
right now i am successfully animate the arc using changing the sweep angle.
and black dot is remaining.
below is the code of getView and animation class
--- init method and implement constructor ----
mRectF = new RectF(mWidth / 2 - 360, mHeight / 2 - 360, mWidth / 2 + 360, mHeight / 2 + 360);
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//draw circle background
mPaint.setColor(getResources().getColor(R.color.timer_background_color));
canvas.drawCircle(mWidth / 2, mHeight / 2, 360, mPaint);
mPaint.setColor(getResources().getColor(R.color.actionbar_back_color));
canvas.drawArc(mRectF, mStartAnagle, mSweepAngle, false, mPaint);
}
public class TimerAnimation extends Animation{
public TimerAnimation (float startAngle, float sweepAngle, long duration) {
mStartAnagle = startAngle;
mSweepAngle = sweepAngle;
setDuration(duration);
setRepeatCount(Animation.INFINITE);
setInterpolator(new LinearInterpolator());
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
if (!isComplete) {
mSweepAngle = mSweepAngle + 6;
if (mSweepAngle >= 360) {
isComplete = true;
mSweepAngle = 360;
}
} else {
mStartAnagle = mStartAnagle + 6;
mSweepAngle = mSweepAngle - 6;
if (mStartAnagle >= 360)
mStartAnagle = 0;
if (mStartAnagle == 270 || mSweepAngle <= 0) {
isComplete = false;
mSweepAngle = 0;
}
}
invalidate();
}
}
Maybe you should use Path
:
Path path = new Path();
// Set the starting position of the path to (0,0).
path.moveTo(0, 0);
path.arcTo(...); //draw your arc here
path.circleTo(); //draw a small circle here at the end of arc
Also maybe you should calc the arc's end position and use as a center for small circle.
Step 1: Calculate the position of the black dot
Suggest the central position is (centerX, centerY), the position of black dot is (x,y), then,
x = radius * cos(mStartAnagle+mSweepAngle) + centerX;
y = radius * sin(mStartAnagle+mSweepAngle) + centerY;
Step 2: Draw the black dot
Suggest the dot image is R.drawable.dot
,
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.dot)
.copy(Bitmap.Config.ARGB_8888, true);
canvas.drawBitmap(bitmap, x, y, null);
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