MarkerDrawable.java 文件源码

private void computePath(Rect bounds) {
    final float currentScale = mCurrentScale;
    final Path path = mPath;
    final RectF rect = mRect;
    final Matrix matrix = mMatrix;

    path.reset();
    int totalSize = Math.min(bounds.width(), bounds.height());

    float initial = mClosedStateSize;
    float destination = totalSize;
    float currentSize = initial + (destination - initial) * currentScale;

    float halfSize = currentSize / 2f;
    float inverseScale = 1f - currentScale;
    float cornerSize = halfSize * inverseScale;
    float[] corners = new float[]{halfSize, halfSize, halfSize, halfSize, halfSize, halfSize, cornerSize, cornerSize};
    rect.set(bounds.left, bounds.top, bounds.left + currentSize, bounds.top + currentSize);
    path.addRoundRect(rect, corners, Path.Direction.CCW);
    matrix.reset();
    matrix.postRotate(-45, bounds.left + halfSize, bounds.top + halfSize);
    matrix.postTranslate((bounds.width() - currentSize) / 2, 0);
    float hDiff = (bounds.bottom - currentSize - mExternalOffset) * inverseScale;
    matrix.postTranslate(0, hDiff);
    path.transform(matrix);
}