Grouping units like in a RTS game

Grouping units like in a RTS game

• Moim Hossain

  Shouldn't be a problem, it's just a question of implementation.
  
  XNA can certainly handle cursor location, mouse clicks and dragging. It's up to you to draw the box and figure out what objects are within in. Then its just a matter of assigning orders to those units. (I assume this is for a RTS game )
  
  
  
  
  

• Steve_j_maas

  what would you recommend for the client server model

  tcp sockets/udp sockets

  greg

  
  

• crazyabtdotnet

  I would've gone with a nice trig function which would calculate the triangle and display just the outside lines....your way is much easier! :)
  

• divya mittal

  Nick, I'm surprised we can agree when I graduated from SVSU in Saginaw and I see you are from Grand Valley. :-P (BTW, I wasn't sure if you could make a bounding box out of that rectangle that you draw but since you can that makes things much easier!)
  
  
  

• zx5000

  Here is an idea for you. Since I haven't actually done it yet, I'm not sure if this is the best way to go about this.
  
  Take the point where the user clicked and started dragging, and draw a line that starts at the click point and goes on the Y to wherever the mouse currently is (keep x at 0). Draw another line that does the same but reversed (draw on X, keep y at 0). Also, draw a line from the current mouse position up to the x that you started at and on the y to where you started at. That will give you a rectangle on your screen that will move when you move the mouse. When you detect that the mouse button has been lifted, change those 4 lines into a box(rectangle ), and loop through every unit on your screen to see if its in that box. I hope thats close because I wouldn't want to mislead someone.
  
  
  

• sorsh

  yes it is.. as said in the topic :)

  i dont know how to draw a simple rectangle with xna.. didnt find a great help in this forum

  
  

• vbnet101

  The bounding box idea sounds the best. It would be making a bounding box with the rectangle and then calling Intersects() for the box against all the units. If intersects equals true then add it to the group!
  
  
  

• Mandana

  GMS0012 wrote:

  yes it is.. as said in the topic :)

  
  
  oops, sorry. missed that.
  
  
  

• Andrew Buyan

  . oops..sry
  

• MNDANG

  Calvin: That's pretty much how I would do it. You could also use XNA's BoundingBox class to help with determining which units are in the box (which you could make from a BoundingBox).
  
  As far as grouping them, you could use subclass a System.Collections.ObjectModel.Collection<>. Then put the units into that. That would be my recommendation. Just create one and all all the intersecting units into it. Then you could make methods for your class like SetTarget() which would in turn set the target for all your units to a place. It would be an easy way to distribute methods to all the units.
  
  

• NickNotYet

  @Calvin Bell

  this is an idea... line by line...

  or i put a transparent rectangle tile above it..

  
  

• ROBSR

  thanks for the ideas..

  i will think about this :)

  greg

  
  
• Grouping units like in a RTS game