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

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

A 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 routines in this class allow you to draw the rectangle by calling the Windows API Rectangle function.

Procedure List

Procedure Name

Type

Description

(Declarations) Declarations Declarations and private variables for the CGDIRectangle class
BorderColor Property Get the current value of the color used to draw the rectangle
BorderWidth Property Get the current value of the BorderWidth used to draw the rectangle
Bottom Property Get the Bottom location of the rectangle
BrushStyle Property Get the current style used to fill the 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 EnumRectangleBrushStyles constants in this class.
FillColor Property Get the current value of the color used to fill the 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.
HatchStyle Property Get the current value of the style used to fill the 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 EnumRectangleHatchStyles constants in this class.
Left Property Get the Left location of the rectangle
PenStyle Property Get the value of the style used to draw the 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 EnumRectanglePenStyles constants in this class.
Right Property Get the Right location of the rectangle
Top Property Get the Top location of the rectangle
Class_Initialize Initialize Set initial values to defaults which may be overridden with property settings
Draw3DRectangle Method Draws two 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 rectangle.
DrawRectangle Method Draw a 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: GDIRectangle

' Example of the CGDIRectangle 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. Two overlapping rectangles are drawn on the form around the location of the click.
'    A 3d rectangle is drawn around the outside of the other two rectangles

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

  Dim GDIRectangle As CGDIRectangle
  Set GDIRectangle = New CGDIRectangle

  ' Erase the form background
  cls

  ' Draw two overlapping rectangles

  With GDIRectangle
    ' First rectangle is solid green with a red border
    .BorderColor = vbRed
    .FillColor = vbGreen
    .BrushStyle = rbsBS_SOLID

    .Left = ScaleX(X, vbTwips, vbPixels) - 50
    .Top = ScaleY(Y, vbTwips, vbPixels) - 50
    .Right = ScaleX(X, vbTwips, vbPixels) + 50
    .Bottom = ScaleY(Y, vbTwips, vbPixels) + 50

    ' Draw the first rectangle
    .DrawRectangle Me.hDC

    ' Second rectangle is hatched yellow with a blue border
    .Left = .Left + 25
    .Top = .Top + 25
    .Right = .Right + 25
    .Bottom = .Bottom + 25

    .BorderColor = vbBlue
    .FillColor = vbYellow
    .BrushStyle = rbsBS_HATCHED
    .HatchStyle = rhsHS_DIAGCROSS

    ' Draw the second rectangle
    .DrawRectangle Me.hDC

    ' Draw the 3D rectangle
    .Left = ScaleX(X, vbTwips, vbPixels) - 75
    .Top = ScaleY(Y, vbTwips, vbPixels) - 75
    .Right = ScaleX(X, vbTwips, vbPixels) + 100
    .Bottom = ScaleY(Y, vbTwips, vbPixels) + 100

    .Draw3DRectangle Me.hDC, vb3DShadow, vb3DHighlight

  End With

End Sub

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