How to achieve local magnification of Cartesian coordinate system

winginwind

The existing rectangular coordinate system needs to enlarge the local coordinate range framed by the mouse. For example, the horizontal axis is from 0-500 at the beginning. Now the mouse framed the horizontal axis between 99-121. How to make the horizontal axis of the coordinate system display only the part between 99-121. I can only achieve the horizontal axis from 99-121, but the scale is not uniform at this time. How to ensure that the scale between the intermediate points is uniform, and the interval is an integer, not a floating point.

alu1124

Download a ZedGraph control source code and have a look, it achieves the function you said. And it is open source.