Add labels to show the current center coordinate and the zoom level.
Need to refactor calculation of real / img range. Do not update directly anymore, but store variables for center and zoom explicitly and add function to update the viewport (real / img range) generically, given the current center coordinate and zoom.
Add labels to show the current center coordinate and the zoom level.
Need to refactor calculation of real / img range. Do not update directly anymore, but store variables for center and zoom explicitly and add function to update the viewport (real / img range) generically, given the current center coordinate and zoom.