"The code is exactly
how I would like to write code and the algorithms used are very
efficient and well-documented."
Van T. Dinh, Microsoft MVP
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Class: CGDIEllipse
Class that draws an ellipse, using Windows API GDI calls.
An ellipse is a circle or oval region whose center is located in the middle of an imaginary bounding rectangle. The routines in this class allow you to draw the ellipse by calling the Windows API Ellipse function.
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Procedure Name
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Type
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Description
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(Declarations)
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Declarations
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Declarations and private variables for the CGDIEllipse class
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BorderColor
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Property
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Sets the value of the color used to draw the ellipse
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BorderWidth
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Property
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Sets the value of the BorderWidth used to draw the ellipse
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Bottom
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Property
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Sets the Bottom location of the bounding rectangle for the ellipse
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BrushStyle
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Property
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Gets the current style used to fill the ellipse
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FillColor
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Property
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Sets the value of the color used to fill the ellipse
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ForegroundMixMode
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Property
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Gets 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 EnumEllipseRasterOps, or the equivalent VB "DrawModeConstants", such as vbCopyPen, vbXorPen etc. See "Drawing Constants" in the VB on-line help.
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HatchStyle
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Property
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Gets the current value of the style used to fill the ellipse 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 EnumEllipseHatchStyles constants in this class.
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Left
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Property
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Gets the Left location of the bounding rectangle for the ellipse
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PenStyle
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Property
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Sets the style used to draw the ellipse
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 EnumEllipsePenStyles constants in this class.
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Right
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Property
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Gets the Right location of the bounding rectangle for the ellipse
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Top
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Property
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Gets the Top location of the bounding rectangle for the ellipse
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Class_Initialize
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Initialize
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Set initial values to defaults which may be overridden with property settings
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Draw3DEllipse
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Method
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Draws two Ellipses 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 ellipse.
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DrawEllipse
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Method
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Draw an Ellipse on a selected device.
The ellipse is bounded by the dimensions of a rectangle specified in the Left, Top, Bottom and Right properties.
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TranslateVBColor
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Private
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Translates VB color constants for system colors into GDI equivalents.
VB color constants, such as vbRed, or 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 VB color constants for system colors (vbButtonFace, vb3DShadow etc.) do not map correctly to those expected by Windows. This wrapper function accepts either form of constant, and translates the value, if necessary, into the equivalent value expected by the Windows GDI subsystem.
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