private int checkBordersX(float scaleFactor, int xPos) {
if ((mImageViewBase.getImageWidth() + xPos) * scaleFactor < mImageViewBase.getFrameWidth()) {
xPos = (int) (mImageViewBase.getFrameWidth() / scaleFactor - mImageViewBase.getImageWidth());
}
if (xPos > 0) {
xPos = 0;
}
return xPos;
}
private int checkBordersY(float scaleFactor, int yPos) {
if ((mImageViewBase.getImageHeight() + yPos) * scaleFactor < mImageViewBase.getFrameHeigth()) {
yPos =
(int) (mImageViewBase.getFrameHeigth() / scaleFactor - mImageViewBase.getImageHeight());
}
if (yPos > 0) {
yPos = 0;
}
return yPos;
}
private void pan(float dx, float dy, float scaleFactor, int xPos, int yPos) {
// compute new position
xPos += dx / scaleFactor;
yPos += dy / scaleFactor;
// check if we meet border
xPos = checkBordersX(scaleFactor, xPos);
yPos = checkBordersY(scaleFactor, yPos);
// update position
mImageViewBase.setImageXPosition(xPos);
mImageViewBase.setImageYPosition(yPos);
}