public void setMaxViewport(Viewport maxViewport) {
        setMaxViewport(maxViewport.left, maxViewport.top, maxViewport.right, maxViewport.bottom);
    }
Set maximum viewport to the same values as viewport passed in parameter. This method use deep copy so parameter
can be safely modified later.

@param maxViewport
hellocharts-library/src/lecho/lib/hellocharts/computator/ChartComputator.java