"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: CGDILine
Class that draws a line, using Windows API GDI calls.
A line is a series of pixels drawn between two points on the screen. The routines in this class allow you to draw the line by calling the Windows API LineTo and MoveToEx functions.
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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 CGDILine 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 line
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BorderWidth
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Property
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Gets the current value of the BorderWidth used to draw the line
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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 EnumLineRasterOps, or the equivalent VB "DrawModeConstants", such as vbCopyPen, vbXorPen etc. See "Drawing Constants" in the VB on-line help.
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PenStyle
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Property
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Gets the value of the style used to draw the line.
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 EnumLinePenStyles constants in this class.
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X1
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Property
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Gets the current location of the horizontal starting point of the line
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X2
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Property
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Gets the current location of the horizontal ending point of the line
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Y1
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Property
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Gets the current location of the vertical starting point of the line
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Y2
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Property
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Gets the current location of the vertical ending point of the line
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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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Draw3DLine
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Method
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Draws two Lines on a selected device so that they create a 3D effect. The normal BorderColor property
is not used with this method. Instead the two colors for the Lines are supplied as parameters
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DrawLine
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Method
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Draw a line
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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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Overview of Total Visual SourceBook
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