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Behavior Pie Chart - Vector Shapes

Added on 7/16/2000

 

Compatibilities:
behavior D8 Mac PC Shockwave

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Author: MediaMacros (website)

Drop on a vector shape to create a pie chart. Make sure each piece has the same center point in the dialog. Using the property inspector you can choose colors from a paletter.

Download PC Source    Download Mac Source
--Copyright 2000 Chuck Neal / 2000 Bob Ippolito
--chuck@mediamacros.com
--If you find this code helpful, send me an e-mail and let me know. :-)
--Pie Chart routines based on the work of Bob Ippolito
--bob@vir2l.com

property radius, pieCenterH, pieCenterV, pieGroup, pieValue, spriteNum, pieColor

on getPropertyDescriptionList me
  p_list = [:]
  p_list.addProp(#radius, [#format : #integer, #comment : "Pie Radius", #default : 100])
  c = sprite(the currentSpriteNum).loc
  p_list.addProp(#pieCenterH, [#format : #integer, #comment : "Pie Center H", #default : c.locH])
  p_list.addProp(#pieCenterV, [#format : #integer, #comment : "Pie Center V", #default : c.locV])
  p_list.addProp(#pieGroup, [#format : #integer, #comment : "Group Number (For multiple Charts)", #default : 1])
  p_list.addProp(#pieValue, [#format : #float, #comment : "Slice Value", #default : 5])
  p_list.addProp(#pieColor, [#format : #color, #comment : "Piece Color", #default : "#000000"])
  return p_list
end

on beginSprite me
  pieList = [:]
  sprite(spriteNum).foreColor = pieColor.paletteindex
  sendAllSprites(#updatePie)
end

on getPieList me, whatGroup, pieList
  if whatGroup = pieGroup then
    pieList.addProp(symbol(string(spriteNum)), pieValue)
  end if
end

on buildTotal pieList
  total=0
  repeat with n=1 to pieList.count
    total=total+pieList[n]
  end repeat
--  You shouldn"t have a zero total.  But this will prevent an error anyways
  if total=0 then total=1
  return total  
end

on updatePie me
  pieList = [:]
  sendAllSprites(#getPieList, pieGroup, pieList)
  total = buildTotal(pieList)
  current = pieList.findPos(symbol(string(spriteNum)))
  mOffset = 0
  if current > 1 then
    repeat with x = 1 to current - 1
      mOffset = mOffset+2*PI*pieList[x]/total
    end repeat    
  end if
  mOffsetB = mOffset+2*PI*pieList[current]/total
  sprite(spriteNum).member.vertexList=nArc(radius,mOffset,mOffsetB)
  sprite(spriteNum).member.regPointVertex=1
end

on nArc radius,theta0,theta1
  retVec=[[#vertex:point(0,0)],[#vertex:anglePt(radius,theta0), #handle1: point(0,0), #handle2: point(0,0)]]
  scale=0
  n=2
  repeat while (theta1-theta0)>0
    t1=theta1
    if (theta1-theta0)>=PI/2 then
      t1=theta0+PI/2
      scale=0.5350
    else
      scale=0.5350 * 2 * (theta1-theta0) / PI
    end if
    retVec[n].handle1 = scale*angleDeriv(radius,theta0)
    retVec.add([#vertex:anglePt(radius,t1), #handle1: point(0,0), #handle2:-scale*angleDeriv(radius,t1)])
    theta0=t1
    n=n+1
  end repeat
  return retVec
end

on anglePt radius,theta
  return point(radius*cos(theta),radius*sin(theta))
end

on angleDeriv radius,theta
  return point(-radius*sin(theta),radius*cos(theta))
end

on getBehaviorDescription me
  d = "This behavior can be dropped on a vector shape to create a pie chart piece.  To edit, change the pieValue property and call a sendAllSprites(#updatePie, groupNumber)"
  d = d & return & "Group Number allows for multiple pies to be on screen at once."
  return d
end

 


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