bb.donnay-software.com

Hi.
I am simple creating viewer/editor for digital maps and have some problems with justify coordinates.
I must recalculating coordinates from screen pixels to cadastral coordinates, this works correct.

But I do not know how I can programatically change cursor type arrow to cross. I know this can change in windows settings but can this change from my app ?
And other problem when I have cursor type arrow and pict to some point, his coordinates is not direct on spike arrow, but some in arrow. How can calculate exactly where is center of arrow ?
Now I must use some coeficient to modify pick point, but this can be not same on other PC with other screen resolution.

You need to add your cross cursor to your .ARC file.

Look at \exp20\lib\express.arc to see how pointers are added.
You will need to fine the appropriate *.CUR file for your cross.

If you are using eXpress++ commands to make your parent object for your vector graphics, then use the CURSOR clause of the DC* command to assign the cursor, otherwise you will need to use <obj>:setPointer(nCursor).

If using eXpress++, you would use a custom handler with the DCREAD GUI .. HANDLER clause, to test the xbeM_Motion event, otherwise if you have your own event loop you can do it with the AppEvent() function. This would give you the cursor coordinates.

Roger, thank you very much, this (express.arc) I am searching.
I will try it.