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Small Basic Sample: Moving Eyes

  • Article

This is a Small Basic sample program that moves eyes formed by Shapes object.  This sample also shows how to use Timer object.

Screen Shot

Following picture is the screen shot of the moving eyes sample.

Code

The source code of the program is listed below.  This program has three subroutines:

  • Init - initialization
  • AddEyes - to add eyes
  • MoveEyes - timer event handler to move eyes
' Moving Eyes Sample
' Copyright © 2019 Nonki Takahashi. The MIT License.
' Program ID LGR690
 
Init()
AddEyes()
Timer.Interval = 100
Timer.Tick = MoveEyes
 
Sub Init
  gw = GraphicsWindow.Width
  gh = GraphicsWindow.Height
  GraphicsWindow.BackgroundColor = "DarkSeaGreen"
EndSub
 
Sub AddEyes
  sx["eye"] = 240
  sy["eye"] = 300
  sx["iris"] = 180
  sy["iris"] = 225
  distance = sx["eye"] * 1.1
  bc["eye"] = "White"
  pc["eye"] = "Black"
  pw["eye"] = 10
  bc["iris"] = "Black"
  pc["iris"] = "LightSeaGreen"
  pw["iris"] = 55
  target[1] = "eye"
  target[2] = "iris"
  For it =  1 To 2
    ' for eye and iris
    GraphicsWindow.BrushColor = bc[target[it]]
    GraphicsWindow.PenColor = pc[target[it]]
    GraphicsWindow.PenWidth = pw[target[it]]
    For i =  1 To 2
      ' for left and right
      sign = 2  * i - 3
      xo[i] = gw  / 2 + sign *  distance /  2
      yo = gh  / 2
      shp[target[it] + i] = Shapes.AddEllipse(sx[target[it]], sy[target[it]])
      Shapes.Move(shp[target[it] + i], xo[i] - sx[target[it]] / 2, yo -  sy[target[it]] / 2)
    EndFor
  EndFor
  dx = sx["eye"] / 2  - pw["eye"] - sx["iris"] / 2
EndSub
 
Sub MoveEyes
  _a = _a  + Math.Pi / 18
  For i =  1 To 2
    x = xo[i] + dx  * Math.Sin(_a)
    Shapes.Move(shp["iris" + i], x -  sx["iris"] / 2, yo -  sy["iris"] / 2)
  EndFor
EndSub

See Also

  • Other samples (in [[articles:Wiki: Small Basic Portal]])  
  • [[articles:Small Basic: Shapes]]
  • [[articles:Small Basic: Timer]]