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Microsoft Access VBA and VB6 Module Library

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Class: GDIArc in Category Microsoft Visual Basic 6 : Graphics from Total Visual SourceBook

Class that draws an arc, using Windows API GDI calls in VB6.

An arc is a line segment of an ellipse. The routines in this class allow you to draw the arc by calling the Windows API Arc function.

Procedure List

Procedure Name	Type	Description
(Declarations)	Declarations	Declarations and private variables for the CGDIArc class.
BorderColor	Property	Get the current value of the color used to draw the arc.
BorderWidth	Property	Get the current value of the BorderWidth used to draw the arc.
Bottom	Property	Get the Bottom location of the bounding rectangle for the arc.
ForegroundMixMode	Property	Get the current value of the ForegroundMixMode property, which defines how colors from the pen and the colors in the existing image are to be combined. The value should be one of the enumerated raster op values exposed in EnumArcRasterOps, or the equivalent VBA/VB6 "DrawModeConstants", such as vbCopyPen, vbXorPen etc. See "Drawing Constants" in the VBA/VB6 on-line help.
Left	Property	Get the Left location of the bounding rectangle for the arc.
PenStyle	Property	Get the value of the style used to draw the arc. The value of this property should be set to one of the Windows API Pen Style constants (PS_SOLID, PS_DASHDOT etc.) which are exposed as EnumArcPenStyles constants in this class.
Right	Property	Get the Right location of the bounding rectangle for the arc.
Top	Property	Get the Top location of the bounding rectangle for the arc.
Class_Initialize	Initialize	Set initial values to defaults which may be overridden with property settings.
DrawArc	Method	Draw an arc on a selected device. The arc is drawn along the edge of an ellipse bounded by an imaginary rectangle, whose dimensions are specified in the Left, Top, Right, and Bottom properties. The end points of the arc are determined by the arguments to this method.
DrawArcByAngle	Method	Draw an arc on a selected device with start and end angles. The arc is drawn along the outside of an imaginary ellipse bounded by the dimensions of a rectangle specified in the Left, Top, Bottom and Right properties.
DrawArcByAngleSweep	Method	Draw an arc on a selected device from a starting point for a specified number of degrees. The arc is drawn along the outside of an imaginary ellipse bounded by the dimensions of a rectangle specified in the Left, Top, Bottom and Right properties.
TranslateVBColor	Private	Translates VBA/VB6 color constants for system colors into GDI equivalents. VBA/VB6 color constants, such as vbRed, vbBlue, or values returned using the QBColor() or RGB() functions, can be used directly for the color values used with Windows API calls. However, the VBA/VB6 color constants for system colors (vbButtonFace, vb3DShadow etc.) do not map correctly to those expected by Windows. This function accepts either form of constant and translates the value, if necessary, into the equivalent value expected by the Windows GDI subsystem.

Example Code for Using Class: GDIArc

' Example of the CGDIArc class
'
' To try this example, do the following:
' 1. Create a new form
' 2. Paste all the code from this example to the new form's module
' 3. Run the form and click on the background. The arcs are drawn
'    based on the location of the click

Private Sub Form_MouseUp(Button As Integer, Shift As Integer, x As Single, Y As Single)

  Dim GDIArc As CGDIArc
  Set GDIArc = New CGDIArc

  With GDIArc
    .Left = ScaleX(X, vbTwips, vbPixels) - 100
    .Top = ScaleY(Y, vbTwips, vbPixels) - 100
    .Right = ScaleX(X, vbTwips, vbPixels) + 100
    .Bottom = ScaleY(Y, vbTwips, vbPixels) + 100

    .BorderWidth = 2

    ' these are the default values
    .ForegroundMixMode = aroR2_COPYPEN
    .PenStyle = apsPS_SOLID

    ' Draw an arc by specifying the radial end-points
    .BorderColor = vbBlue
    .DrawArc Me.hDC, .Right, .Bottom + 10, .Right - 10, .Top

    ' Draw an arc by specifying the angles
    .BorderColor = vbGreen
    .DrawArcByAngle Me.hDC, 90, 180

    ' Draw an arc by specifying the starting angle and an offset
    .BorderColor = vbRed
    .DrawArcByAngleSweep Me.hDC, 200, 10

  End With

End Sub

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