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

Class that draws a rounded rectangle, using Windows API GDI calls in VB6.

A rounded rectangle is a region whose location is determined by the Left, Top, Right and Bottom properties of this class. The angles of the corners of the rectangle are always drawn at 90 degrees. The corners of the rectangle are rounded off based on the value of the Height and Width properties. The routines in this class allow you to draw the rounded rectangle by calling the Windows API RoundRect function.

Procedure List

Procedure Name

Type

Description

(Declarations) Declarations Declarations and private variables for the CGDIRoundRect class
BorderColor Property Get the current value of the color used to draw the rounded rectangle
BorderWidth Property Get the current value of the BorderWidth used to draw the rounded rectangle
Bottom Property Get the Bottom location of the rounded rectangle
BrushStyle Property Get the current style used to fill the rounded rectangle. The value of this property should be set to one of the Windows API Brush Style constants (BS_SOLID, BS_HOLLOW, BS_HATCHED etc.) which are exposed as EnumRoundRectBrushStyles constants in this class.
FillColor Property Get the current value of the color used to fill the rounded rectangle
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 EnumRoundRectRasterOps, or the equivalent VBA/VB6 "DrawModeConstants", such as vbCopyPen, vbXorPen etc. See "Drawing Constants" in the VBA/VB6 on-line help.
HatchStyle Property Get the current value of the style used to fill the rounded rectangle when the BrushStyle is set to hatched. The value of this property should be set to one of the Windows API Hatch Style constants (HS_HORIZONTAL, HS_BDIAGONAL, HS_CROSS etc.) which are exposed as EnumRoundRectHatchStyles constants in this class.
Height Property Get the height of the ellipse used to draw rounded corners of the rectangle. This value controls how "rounded" the rounded corners of the rectangle will be (i.e. where the ellipse used to draw the corner is located.)
Left Property Get the Left location of the rounded rectangle
PenStyle Property Get the value of the style used to draw the rounded rectangle. 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 EnumRoundRectPenStyles constants in this class.
Right Property Get the Right location of the rounded rectangle
Top Property Get the Top location of the rounded rectangle
Width Property Get the width of the ellipse used to draw rounded corners of the rectangle. This value controls how "rounded" the rounded corners of the rectangle will be (i.e. where the ellipse used to draw the corner is located.)
Class_Initialize Initialize Set initial values to defaults which may be overridden with property settings
Draw3DRoundRect Method Draws two rounded rectangles on a selected device so that they create a 3D effect. This method ignores the regular BorderColor and FillStyle properties, and instead uses the colors which are passed to it to draw a 3D rounded rectangle.
DrawRoundRect Method Draw a rounded rectangle on a selected device.
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: GDIRoundRect

' Example of the CGDIRoundRect 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. A rounded rectangle is
'    drawn on the form around the location of the click. A 3D rounded
'    rectangle is drawn around the borders of the form

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

  Dim GDIRoundRect As CGDIRoundRect
  Set GDIRoundRect = New CGDIRoundRect

  With GDIRoundRect
    .Left = ScaleX(X, vbTwips, vbPixels) - 100
    .Top = ScaleY(Y, vbTwips, vbPixels) - 50
    .Right = ScaleX(X, vbTwips, vbPixels) + 100
    .Bottom = ScaleY(Y, vbTwips, vbPixels) + 50
    .Width = 50
    .Height = 50

    .BorderColor = vbBlue
    .BorderWidth = 5
    .FillColor = vbYellow

    ' Draw the rounded rectangle
    .DrawRoundRect Me.hDC

    ' Draw the 3D rounded rectangle
    .Left = 10
    .Top = 10
    .Right = ScaleX(Me.ScaleWidth, vbTwips, vbPixels) - 10
    .Bottom = ScaleY(Me.ScaleHeight, vbTwips, vbPixels) - 10
    .Width = 50
    .Height = 50

    .BorderWidth = 1
    .Draw3DRoundRect Me.hDC, vb3DShadow, vb3DHighlight

  End With

End Sub

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