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snapping_in_pcb [2018/07/11 21:46]
cparker [Discussion]
snapping_in_pcb [2018/08/20 08:09] (current)
cparker [TODO List]
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 How does it work? How does it work?
 The plugin is loaded and creates it's alternate ''​SnapList''​. It can populate it from the structures that already exist in crosshair.c,​ I think, by declaring them as externs. The plugin is loaded and creates it's alternate ''​SnapList''​. It can populate it from the structures that already exist in crosshair.c,​ I think, by declaring them as externs.
 +
 +I'm currently experimenting with this in the home/​cparker/​mod_snapping_plugin branch. I have this code built as a plugin, but I also included it in the source tree just in case people had trouble with the plugin.
 +
 +==Snapping and Layers==
 +It's frequently the case that you only want to snap to objects on certain layers. What's the best way to implement this?
 +
 +Presently, SearchObjectByLocation doesn'​t have a layer parameter. It simply iterates over them all with every search. So, we would have to expose some of the lower level searching functions in order to restrict layers, or add layers as a parameter to SearchObjectByLocation. That function is called in a lot of places, so, it would be a lot of calls to have to update.
 +
 +How do I keep track of which layers I'm searching? Do I pass pointers? Layer numbers?
 =====TODO List===== =====TODO List=====
   * snap based on screen distance instead of linear distance   * snap based on screen distance instead of linear distance
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   * tests   * tests
  
 +=====Current Work In Progress=====
 +Based on email exchanges and testing by Richard.
 +
 +The snapping code needs to know about layers. We want to be able to search for things to snap to only on certain layers, and then in a particular order.
 ===== Related Pages ===== ===== Related Pages =====
   * [[PCB Crosshair|PCB Crosshair]]   * [[PCB Crosshair|PCB Crosshair]]
  
snapping_in_pcb.1531359991.txt.gz ยท Last modified: 2018/07/11 21:46 by cparker