Basic Drawing Functions - Rectangles, Ellipses, Line Styles

Sub ColorBox()
Dim c, myBoxSize, myInterval
Dim x1, y1, x2, y2 
  
  InitializeGraphics   ' Declaration of using graphics library

  gClear   ' Clear screen
  myBoxSize = 24
  myInterval = myBoxSize + 6
  x1 = 10
  y1 = 10
  For c = 0 To 14
     DrawRectangle x1, y1, x1 + myBoxSize, y1 + myBoxSize, QBColor(c)   ' Draw a box
     x1 = x1 + myInterval
  Next c
  x1 = 10
  y1 = 60
  For c = 0 To 14
     DrawRectangleFill x1, y1, x1 + myBoxSize, y1 + myBoxSize, QBColor(c)   ' Draw a filled box
     x1 = x1 + myInterval
  Next c
  x1 = 10
  y1 = 100
  For c = 0 To 14
   ' Draw a box with different fill color and line color
     DrawRectangleFill x1, y1, x1 + myBoxSize, y1 + myBoxSize, QBColor(c), QBColor(c + 1)
     x1 = x1 + myInterval
  Next c
  
 End Sub

Sub ColorCircle()
Dim c, r, d
Dim x, y
  
  r = 20
  d = 50

  InitializeGraphics   ' Declaration of using graphics library

  gClear   ' Clear screen

  c = 0   ' Initialize color number
  For y = 30 To 100 Step d
    For x = 40 To 400 Step d
      DrawOval x, y, r, r, QBColor(c)   ' Draw a circle
      c = c + 1
    Next x
  Next y
  
  c = 0
  For y = 140 To 210 Step d
    For x = 40 To 400 Step d
      DrawOvalFill x, y, r, r, QBColor(c)   ' Draw a filled circle
      c = c + 1
    Next x
  Next y
End Sub

Sub DrawOvalTest()

  InitializeGraphics   ' Declaration of using graphics library
  ' Draw an ellipse
  DrawOval 100, 80, 70, 30, vbGreen
  ' Draw a circle
  DrawOval 200, 80, 30, 30, vbBlack
  ' Specification of radius ratio of oval and line color by default
  DrawOval 260, 80, 50
  ' Specification of line and fill color by QBColor function
  DrawOvalFill 360, 80, 40, , QBColor(9), QBColor(12)
  
End Sub

Sub LineStyleTest（）
  Dim c, y
  Const x1 = 30
  Const x2 = 330
  Const d = 20

  InitializeGraphics   ' Declaration of using graphics library

  gClear   ' Clear screen
  gLineWidth = 6#   ' Set the line width
  c = QBColor(0)
  y = 30
  DrawLine x1, y, x2, y, c   ' Draw a line
  
  y = y + d
  SetDashStyle msoLineDash   ' Set line style
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetDashStyle msoLineDashDot
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetDashStyle msoLineDashDotDot
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetDashStyle msoLineRoundDot
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetDashStyle msoLineSquareDot
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetDashStyle msoLineSolid   '  Set the style of line - Solid line
  DrawLine x1, y, x2, y, c

  gLineWidth = 10#   ' Set the thickness of line
  y = y + d * 2
  SetLineStyle msoLineSingle  
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetLineStyle msoLineThinThin
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetLineStyle msoLineThinThick
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetLineStyle msoLineThickThin
  DrawLine x1, y, x2, y, c
  
  y = y + d
  SetLineStyle msoLineThickBetweenThin
  DrawLine x1, y, x2, y, c
End Sub