Motion of swipe in real time to another actor

Comments

• RThurman Member, Sous Chef, PRO Posts: 2,879

  October 2012

  
  In an actor, make two (real) attributes: xOffset, yOffset
  
  Then make a rule:
  When mouse down
  -- Change Attribute: self.xOffset To: game.Mouse.Position.X - self.Position.X
  -- Change Attribute: self.yOffset To: game.Mouse.Position.Y - self.Position.Y
  -- Constrain Attribute: self.Position.X To: game.Mouse.Position.X - self.xOffset
  -- Constrain Attribute: self.Position.Y To: game.Mouse.Position.Y - self.yOffset
  
  That should get things started!
  
• epicstag PRO Posts: 132

  October 2012

  You know I ended up using a different method to do what I needed, but I will definitely be using this behavior in the future for something, so thank you for the help. Gotta say, it's challenging going from an environment with complete OOP style of control(I'm a php/mysql coder on the side), to a new environment like this.
  
  But I'm pumping out ideas quick as lightning, so I'm loving this program.

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• RThurman Member, Sous Chef, PRO Posts: 2,879

  October 2012

  Glad you found a way to accomplish what you wanted. For the sake of future searchers, how did you solve this? Its always interesting to see the many way GameSalad can be used to solve a particular challenge.
  
  I do agree with you. GameSalad's great interface and methodology really frees us from the the constraints of conventional coding. It encourages ideas to just flow "quick as lightning" as you say.
• epicstag PRO Posts: 132

  October 2012

  I ended up making a drag actor, and put a rule that stated:
  
  When mouse button is down{
  Change self.positionY to game.mousePositionY
  Constrain self.motion.linearVelocity.Y to 20*( game.Mouse.Position.Y - self.Position.Y )
  } else {
  Constrain self.motion.linearVelocity.Y to self.Motion.Linear Velocity.Y *0.95
  }
  Constrain game.dragVelocity to self.Motion.Linear Velocity.Y
  }
  
  Then I simply placed the actors that I wanted to drag, and:
  Constrain self.motion.linearVelocity.Y to game.dragVelocity
  
  The actors then move with the same speed that I am swiping. I actually added a few more constraints to the rule in the drag actor to limit the swiping to a certain area of the screen:
  
  game.mousePosition.X > 20
  game.mousePositionX < 200
  game.mousePositionY > 370
  game.mousePositionY < 730
  
  These are of course variable and irrellevant.
  
  A big thanks to tshirtbooth's tutorial vids on getting this method working. I cant wait to demo this app out to you guys. Any parents out there should get a kick out of my app.

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• RThurman Member, Sous Chef, PRO Posts: 2,879

  October 2012 edited October 2012

  Great Solution! Thanks for sharing it.
  
  Edit----
  Here is another variation that might be less processor intensive. It allows the rest of the physics engine to play nice with the actor. And it does not require an extra drag actor. (It does require you to define one attribute -- yOffset.) Just place the following into the regular actor:
  
  Change Attribute: self.Physics.Drag To:100
  When MouseDown
  -- Change Attribute: self.yOffset To: game.Mouse.Position.Y-self.Position.Y
  -- Constrain Attribute: self.motion.Linear Velocity.Y To: 20*(game.Mouse.Position.Y-(self.Position.Y +self.yOffset))
• epicstag PRO Posts: 132

  October 2012

  I didn't try this out, but it looks really solid. I'll definitely use that logic in a future project for things. The solution with the drag actor ended up being perfect for my project, because I have a line of vertically scrolling buttons, so they are all able to be tied to the drag actor, and when I drag one, they all move.
  
  It works a charm and looks really nice. You're solution will work great with my side project though. Thanks for sharing that.

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