public void setZoom(float scale, float focusX, float focusY) {
        setZoom(scale, focusX, focusY, mScaleType);
    }
Set zoom to the specified scale. Image will be centered around the point
(focusX, focusY). These floats range from 0 to 1 and denote the focus point
as a fraction from the left and top of the view. For example, the top left
corner of the image would be (0, 0). And the bottom right corner would be (1, 1).

@param scale
@param focusX
@param focusY
app/src/main/java/com/rozdoum/socialcomponents/views/TouchImageView.java