Class Element

Description

Elements are visual components on layers other than main. They can be manipulated by programming through the Element class at runtime. Used in concert with Layer, this functionality provided a powerful way of controlling the paralax scrolling and other multi-layer game visual effects.

Members

• int x
  
• int y
  
• bool show
  
• int imageSet
  
• int imageNo
  
• int id
  

Element:hide

• in void
  
• out void
  

Hide this element.

---

Element:move

• in int aim
  
• out bool
  

Move this element to the direction of the given `aim`. This will change the position by eight pixel in one of following direction. These constants cannot be combined.

UP
DOWN
LEFT
RIGHT

---

Element:moveBy

• in int tx
  
• in int ty
  
• out void
  

Move the element by translation. The new position is the result of `x = x + tx` and `y = y + ty`.

local layer = getLayer( "fw"); 
 
for i=1, layer:getSize()  do 
 
  local t = rand () % 8; 
 
  local e = layer:getElement( i - 1);
  if (e.y > BUFFERHEI) then
    e:moveTo(rand() % BUFFERLEN, (rand() % BUFFERHEI) - BUFFERHEI);
  else
     if (t == 0) then
       e:moveBy(1, 0);
     end 
 
     if (t == 7) then
        e:moveBy(-1, 0);
     end 
 
     e:moveBy(0, 4);
  end 
 
end

---

Element:moveTo

• in int x
  
• in int y
  
• out void
  

Move this element to a new position.

e:moveTo(100, 100)

---

Element:setImage

• in int imageSet
  
• in int imageNo
  
• out void
  

Change the image assigned to a given element.

---

Element:show

• in void
  
• out void
  

Show the element.