CDrawingManager Class

Article
06/05/2017

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The CDrawingManager class implements complex drawing algorithms.

Syntax

class CDrawingManager : public CObject

Members

Public Constructors

Name	Description
CDrawingManager::CDrawingManager	Constructs a `CDrawingManager` object.
`CDrawingManager::~CDrawingManager`	Destructor.

Public Methods

Name	Description
CDrawingManager::CreateBitmap_32	Creates a 32-bit device-independent bitmap (DIB) that applications can write to directly.
CDrawingManager::DrawAlpha	Displays bitmaps that have transparent or semitransparent pixels.
CDrawingManager::DrawRotated	Rotates a source DC content inside the given rectangle by +/- 90 degrees
CDrawingManager::DrawEllipse	Draws an ellipse with the supplied fill and border colors.
CDrawingManager::DrawGradientRing	Draws a ring and fills it with a color gradient.
CDrawingManager::DrawLine, CDrawingManager::DrawLineA	Draws a line.
CDrawingManager::DrawRect	Draws a rectangle with the supplied fill and border colors.
CDrawingManager::DrawShadow	Draws a shadow for a rectangular area.
CDrawingManager::Fill4ColorsGradient	Fills a rectangular area with two color gradients.
CDrawingManager::FillGradient	Fills a rectangular area with a specified color gradient.
CDrawingManager::FillGradient2	Fills a rectangular area with a specified color gradient. The direction of the gradient's color change is also specified.
CDrawingManager::GrayRect	Fills a rectangle with a specified gray color.
CDrawingManager::HighlightRect	Highlights a rectangular area.
CDrawingManager::HLStoRGB_ONE	Converts a color from a HLS representation to a RGB representation.
CDrawingManager::HLStoRGB_TWO	Converts a color from a HLS representation to a RGB representation.
CDrawingManager::HSVtoRGB	Converts a color from a HSV representation to a RGB representation.
CDrawingManager::HuetoRGB	Helper method that converts a hue value to a red, green, or blue component.
CDrawingManager::MirrorRect	Flips a rectangular area.
CDrawingManager::PixelAlpha	Helper method that determines the final color for a semitransparent pixel.
CDrawingManager::PrepareShadowMask	Creates a bitmap that can be used as a shadow.
CDrawingManager::RGBtoHSL	Converts a color from a RGB representation to a HSL representation.
CDrawingManager::RGBtoHSV	Converts a color from a RGB representation to a HSV representation.
CDrawingManager::SetAlphaPixel	Helper method that colors a partially transparent pixel in a bitmap.
CDrawingManager::SetPixel	Helper method that changes a single pixel in a bitmap to the specified color.
CDrawingManager::SmartMixColors	Combines two colors based on a weighted ratio.

Remarks

The CDrawingManager class provides functions for drawing shadows, color gradients, and highlighted rectangles. It also performs alpha-blending. You can use this class to directly change your application's UI.

Inheritance Hierarchy

CObject

Â Â Â CDrawingManager

Requirements

Header: afxdrawmanager.h

CDrawingManager::CDrawingManager

Constructs a CDrawingManager object.

CDrawingManager(CDC& dc);

Parameters

[in] dc
A reference to a device context. The CDrawingManager uses this context for drawing.

CDrawingManager::CreateBitmap_32

Creates a 32-bit device-independent bitmap (DIB) that applications can write to directly.

static HBITMAP __stdcall CreateBitmap_32(
    const CSize& size,  
    void** pBits);
 
static HBITMAP __stdcall CreateBitmap_32(
    HBITMAP bitmap,  
    COLORREF clrTransparent = -1);

Parameters

Parameter	Description
[in] `size`	A CSize parameter that indicates the size of the bitmap.
[out] `pBits`	A pointer to a data pointer that receives the location of the DIB's bit values.
`bitmap`	A handle to the original bitmap
`clrTransparent`	An RGB value specifying transparent color of the original bitmap.

Return Value

A handle to the newly created DIB bitmap if this method is successful; otherwise NULL.

Remarks

For more information about how to create a DIB bitmap, see CreateDIBSection.

CDrawingManager::DrawAlpha

Displays bitmaps that have transparent or semitransparent pixels.

void DrawAlpha(
    CDC* pDstDC,  
    const CRect& rectDst,  
    CDC* pSrcDC,  
    const CRect& rectSrc);

Parameters

[in] pDstDC
A pointer to the device context for the destination.

[in] rectDst
The destination rectangle.

[in] pSrcDC
A pointer to the device context for the source.

[in] rectSrc
The source rectangle.

Remarks

This method performs alpha-blending for two bitmaps. For more information about alpha-blending, see AlphaBlend in the Windows SDK.

CDrawingManager::DrawEllipse

Draws an ellipse with the supplied fill and border colors.

void DrawEllipse(
    const CRect& rect,  
    COLORREF clrFill,  
    COLORREF clrLine);

Parameters

[in] rect
The bounding rectangle for the ellipse.

[in] clrFill
The color this method uses to fill the ellipse.

[in] clrLine
The color this method uses as the border of the ellipse.

Remarks

This method returns without drawing an ellipse if either color is set to -1. It also returns without drawing an ellipse if either dimension of the bounding rectangle is 0.

CDrawingManager::DrawGradientRing

Draws a ring and fills it with a color gradient.

BOOL DrawGradientRing(
    CRect rect,  
    COLORREF colorStart,  
    COLORREF colorFinish,  
    COLORREF colorBorder,  
    int nAngle,  
    int nWidth,  
    COLORREF clrFace = (COLORREF)-1);

Parameters

[in] rect
A CRect parameter that specifies the boundary for the gradient ring.

[in] colorStart
The first color for the gradient.

[in] colorFinish
The last color for the gradient.

[in] colorBorder
The color of the border.

[in] nAngle
A parameter that specifies the initial gradient drawing angle. This value should be between 0 and 360.

[in] nWidth
The width of the border for the ring.

[in] clrFace
The color of the interior of the ring.

Return Value

Nonzero if successful; otherwise 0.

Remarks

The rectangle defined by rect must be at least 5 pixels wide and 5 pixels high.

CDrawingManager::DrawLine, CDrawingManager::DrawLineA

Draws a line.

void DrawLine(
    int x1,  
    int y1,  
    int x2,  
    int y2,  
    COLORREF clrLine);
 
void DrawLineA(
    double x1,  
    double y1,  
    double x2,  
    double y2,  
    COLORREF clrLine);

Parameters

Parameter	Description
[in] `x1`	The x coordinate where the line starts.
[in] `y1`	The y coordinate where the line starts.
[in] `x2`	The x coordinate where the line ends.
[in] `y2`	The y coordinate where the line ends.
[in] `clrLine`	The color of the line.

Remarks

This method fails if clrLine equals -1.

CDrawingManager::DrawRect

Draws a rectangle with the supplied fill and border colors.

void DrawRect(
    const CRect& rect,  
    COLORREF clrFill,  
    COLORREF clrLine);

Parameters

[in] rect
The boundaries for the rectangle.

[in] clrFill
The color this method uses to fill the rectangle.

[in] clrLine
The color this method uses for the border of the rectangle.

Remarks

This method returns without drawing a rectangle if either color is set to -1. It also returns if either dimension of the rectangle is 0.

CDrawingManager::DrawShadow

Draws a shadow for a rectangular area.

BOOL DrawShadow(
    CRect rect,  
    int nDepth,  
    int iMinBrightness = 100,  
    int iMaxBrightness = 50,  
    CBitmap* pBmpSaveBottom = NULL,  
    CBitmap* pBmpSaveRight = NULL,  
    COLORREF clrBase = (COLORREF)-1,  
    BOOL bRightShadow = TRUE);

Parameters

[in] rect
A rectangular area in your application. The drawing manager will draw a shadow underneath this area.

[in] nDepth
The width and height of the shadow.

[in] iMinBrightness
The minimum brightness of the shadow.

[in] iMaxBrightness
The maximum brightness of the shadow.

[in] pBmpSaveBottom
A pointer to a bitmap that contains the image for the bottom part of the shadow.

[in] pBmpSaveRight
A pointer to a bitmap that contains the image for the shadow that is drawn on the right side of the rectangle.

[in] clrBase
The color of the shadow.

[in] bRightShadow
A Boolean parameter that indicates how the shadow is drawn. If bRightShadow is TRUE, DrawShadow draws a shadow on the right side of the rectangle.

Return Value

Nonzero if successful; otherwise 0.

Remarks

You can provide two valid bitmaps for the bottom and right shadows by using the parameters pBmpSaveBottom and pBmpSaveRight. If these CBitmap objects have an attached GDI object, DrawShadow will use those bitmaps as the shadows. If the CBitmap parameters do not have an attached GDI object, DrawShadow draws the shadow and attaches the bitmaps to the parameters. In future calls to DrawShadow, you can provide these bitmaps to speed up the drawing process. For more information about the CBitmap class and GDI objects, see Graphic Objects.

If either of these parameters is NULL, DrawShadow will automatically draw the shadow.

If you set bRightShadow to FALSE, the shadow will be drawn underneath and to the left of the rectangular area.

Example

The following example demonstrates how to use the DrawShadow method of the CDrawingManager class. This code snippet is part of the Prop Sheet Demo sample.

   // CDC* pDC
    // CRect rectHeader
    CDrawingManager dm (*pDC);
    // Draw a shadow for a rectangular area.
    // second parameter is the depth of the shadow
    dm.DrawShadow (rectHeader, 2);

CDrawingManager::Fill4ColorsGradient

Fills a rectangular area with two color gradients.

void Fill4ColorsGradient(
    CRect rect,  
    COLORREF colorStart1,  
    COLORREF colorFinish1,  
    COLORREF colorStart2,  
    COLORREF colorFinish2,  
    BOOL bHorz = TRUE,  
    int nPercentage = 50);

Parameters

[in] rect
The rectangle to fill.

[in] colorStart1
The initial color for the first color gradient.

[in] colorFinish1
The final color for the first color gradient.

[in] colorStart2
The initial color for the second color gradient.

[in] colorFinish2
The final color for the second color gradient.

[in] bHorz
A Boolean parameter that indicates whether Fill4ColorsGradient colors a horizontal or vertical gradient. TRUE indicates a horizontal gradient.

[in] nPercentage
An integer from 0-100. This value indicates the percentage of the rectangle to fill with the first color gradient.

Remarks

When a rectangle is filled with two color gradients, they are either located above each other or next to each other, depending on the value of bHorz. Each color gradient is calculated independently with the method CDrawingManager::FillGradient.

This method generates an assertion failure if nPercentage is less than 0 or more than 100.

CDrawingManager::FillGradient

Fills a rectangular area with the specified color gradient.

void FillGradient(
    CRect rect,  
    COLORREF colorStart,  
    COLORREF colorFinish,  
    BOOL bHorz = TRUE,  
    int nStartFlatPercentage = 0,  
    int nEndFlatPercentage = 0);

Parameters

[in] rect
The rectangular area to fill.

[in] colorStart
The first color for the gradient.

[in] colorFinish
The final color for the gradient.

[in] bHorz
A Boolean parameter that specifies whether FillGradient should draw a horizontal or vertical gradient.

[in] nStartFlatPercentage
The percentage of the rectangle that FillGradient fills with colorStart before it starts the gradient.

[in] nEndFlatPercentage
The percentage of the rectangle that FillGradient fills with colorFinish after it finishes the gradient.

Example

The following example demonstrates how to use the FillGradient method of the CDrawingManager class. This code snippet is part of the MS Office 2007 Demo sample.

            // CRect rectScreen
            // CDrawingManager dm
            dm.FillGradient(rectScreen, RGB(114, 125, 152), RGB(178, 185, 202), TRUE);

CDrawingManager::FillGradient2

Fills a rectangular area with a specified color gradient.

void FillGradient2 (
    CRect rect,  
    COLORREF colorStart,  
    COLORREF colorFinish,  
    int nAngle = 0);

Parameters

[in] rect
The rectangular area to fill.

[in] colorStart
The first color of the gradient.

[in] colorFinish
The last color of the gradient.

[in] nAngle
An integer between 0 and 360. This parameter specifies the direction of the color gradient.

Remarks

Use nAngle to specify the direction of the color gradient. When you specify the direction of the color gradient, you also specify where the color gradient starts. A value of 0 for nAngle indicates the gradient starts from the top of the rectangle. As nAngle increases, the starting location for the gradient moves in a counter-clockwise direction based on the angle.

Example

The following example demonstrates how to use the FillGradient2 method of the CDrawingManager class. This code snippet is part of the New Controls sample.

 // CRect rect
    // CDC* pDC
    CDrawingManager dm(*pDC);
    // The last parameter is the angle that specifies the direction of the color gradient.
    dm.FillGradient2(rect, RGB(102, 200, 238), RGB(0, 129, 185), 45);

CDrawingManager::GrayRect

Fills a rectangle with a specified gray color.

BOOL GrayRect(
    CRect rect,  
    int nPercentage = -1,  
    COLORREF clrTransparent = (COLORREF)-1,  
    COLORREF clrDisabled = (COLORREF)-1);

Parameters

[in] rect
The rectangular area to fill.

[in] nPercentage
The percentage of gray you want in the rectangle.

[in] clrTransparent
The transparent color.

[in] clrDisabled
The color that this method uses for de-saturation if nPercentage is set to -1.

Return Value

TRUE if the method was successful; otherwise FALSE.

Remarks

For the parameter nPercentage, a lower value indicates a darker color.

The maximum value for nPercentage is 200. A value larger than 200 does not change the appearance of the rectangle. If the value is -1, this method uses clrDisabled to limit the saturation of the rectangle.

CDrawingManager::HighlightRect

Highlights a rectangular area.

BOOL HighlightRect(
    CRect rect,  
    int nPercentage = -1,  
    COLORREF clrTransparent = (COLORREF)-1,  
    int nTolerance = 0,  
    COLORREF clrBlend = (COLORREF)-1);

Parameters

[in] rect
A rectangular area to highlight.

[in] nPercentage
A percentage that indicates how transparent the highlight should be.

[in] clrTransparent
The transparent color.

[in] nTolerance
An integer between 0 and 255 that indicates the color tolerance.

[in] clrBlend
The base color for blending.

Return Value

TRUE if the method is successful; otherwise FALSE.

Remarks

If nPercentage is between 0 and 99, HighlightRect uses the alpha blending algorithm. For more information about alpha blending, see Alpha Blending Lines and Fills. If nPercentage is -1, this method uses the default highlight level. If nPercentage is 100, this method does nothing and returns TRUE.

The method uses the parameter nTolerance to determine whether to highlight the rectangular area. To highlight the rectangle, the difference between the background color of your application and clrTransparent must be less than nTolerance in each color component (red, green, and blue).

CDrawingManager::HLStoRGB_ONE

Converts a color from a HLS representation to a RGB representation.

static COLORREF __stdcall HLStoRGB_ONE(
    double H,  
    double L,  
    double S);

Parameters

[in] H
A number between 0 and 1 that represents the hue for the color.

[in] L
A number between 0 and 1 that indicates the luminosity for the color.

[in] S
A number between 0 and 1 that indicates the saturation for the color.

Return Value

The RGB representation of the HLS color provided.

Remarks

A color can be represented as HSV (hue, saturation, and value), HSL (hue, saturation, and luminosity), or RGB (red, green, and blue). For more information about the different representations of color, see Color.

This method and the CDrawingManager::HLStoRGB_TWO method perform the same operation, but require different values for the H parameter. In this method, H is a percentage of the circle. In the CDrawingManager::HLStoRGB_TWO method, H is a degree value between 0 and 360, which both represent red. For example, with HLStoRGB_ONE, a value of 0.25 for H is equivalent to a value of 90 with HLStoRGB_TWO.

CDrawingManager::HLStoRGB_TWO

Converts a color from a HLS representation to a RGB representation.

static COLORREF __stdcall HLStoRGB_TWO(
    double H,  
    double L,  
    double S);

Parameters

[in] H
A number between 0 and 360 that represents the hue for the color.

[in] L
A number between 0 and 1 that indicates the luminosity for the color.

[in] S
A number between 0 and 1 that indicates the saturation for the color.

Return Value

The RGB representation of the HLS color provided.

Remarks

This method and the CDrawingManager::HLStoRGB_ONE method perform the same operation, but require different values for the H parameter. In this method, H is a degree value between 0 and 360, which both represent red. In the CDrawingManager::HLStoRGB_ONE method, H is a percentage of the circle. For example, with HLStoRGB_ONE, a value of 0.25 for H is equivalent to a value of 90 with HLStoRGB_TWO.

CDrawingManager::HSVtoRGB

Converts a color from a HSV representation to a RGB representation.

static COLORREF __stdcall HSVtoRGB(
    double H,  
    double S,  
    double V);

Parameters

Parameter	Description
[in] `H`	A number between 0 and 360 that indicates the hue for the color.
[in] `S`	A number between 0 and 1 that indicates the saturation for the color.
[in] `V`	A number between 0 and 1 that indicates the value for the color.

Return Value

The RGB representation of the HSV color provided.

Remarks

CDrawingManager::HuetoRGB

Converts a hue value to a red, green, or blue component.

static double __stdcall HuetoRGB(
    double m1,  
    double m2,  
    double h);

 
static BYTE __stdcall HueToRGB(
    float rm1,  
    float rm2,  
    float rh);

Parameters

[in] m1
See Remarks.

[in] m2
See Remarks.

[in] h
See Remarks.

[in] rm1
See Remarks.

[in] rm2
See Remarks.

[in] rh
See Remarks.

Return Value

The individual red, green, or blue component for the provided hue.

Remarks

This method is a helper method that the CDrawingManager Class uses to compute the individual red, green, and blue components of a color in a HSV or HSL representation. This method is not designed to be called directly by the programmer. The input parameters are values that depend on the conversion algorithm.

To convert a HSV or HSL color to a RGB representation, call one of the following methods:

CDrawingManager::HSVtoRGB
CDrawingManager::HLStoRGB_ONE
CDrawingManager::HLStoRGB_TWO

CDrawingManager::MirrorRect

Flips a rectangular area.

void MirrorRect(
    CRect rect,  
    BOOL bHorz = TRUE);

Parameters

[in] rect
The bounding rectangle of the area to flip.

[in] bHorz
A Boolean parameter that indicates whether the rectangle flips horizontally or vertically.

Remarks

This method can flip any area of the device context owned by the CDrawingManager Class. If bHorz is set to TRUE, this method flips the area horizontally. Otherwise, it flips the area vertically.

CDrawingManager::PixelAlpha

Calculates the final color for a semitransparent pixel.

static COLORREF __stdcall PixelAlpha(
    COLORREF srcPixel,  
    int percent);
 
static COLORREF __stdcall PixelAlpha(
    COLORREF srcPixel,  
    double percentR,  
    double percentG,  
    double percentB);

static COLORREF __stdcall PixelAlpha(
    COLORREF srcPixel,  
    COLORREF dstPixel,  
    int percent);

Parameters

[in] srcPixel
The initial color for the pixel.

[in] percent
A number between 0 and 100 that represents the percentage of transparency. A value of 100 indicates that the initial color is completely transparent.

[in] percentR
A number between 0 and 100 that represents the percentage of transparency for the red component.

[in] percentG
A number between 0 and 100 that represents the percentage of transparency for the green component.

[in] percentB
A number between 0 and 100 that represents the percentage of transparency for the blue component.

[in] dstPixel
The base color for the pixel.

Return Value

The final color for the semitransparent pixel.

Remarks

This is a helper class for coloring semitransparent bitmaps and is not designed to be called directly by the programmer.

When you use the version of the method that has dstPixel, the final color is a combination of dstPixel and srcPixel. The srcPixel color is the partially transparent color over the base color of dstPixel.

CDrawingManager::PrepareShadowMask

Creates a bitmap that can be used as a shadow.

static HBITMAP __stdcall PrepareShadowMask (
    int nDepth,  
    COLORREF clrBase,  
    int iMinBrightness = 0,  
    int iMaxBrightness = 100);

Parameters

[in] nDepth
The width and height of the shadow.

[in] clrBase
The color of the shadow.

[in] iMinBrightness
The minimum brightness of the shadow.

[in] iMaxBrightness
The maximum brightness of the shadow.

Return Value

A handle to the created bitmap if this method is successful; otherwise NULL.

Remarks

If nDepth is set to 0, this method exits and returns NULL. If nDepth is less than 3, the width and height of the shadow are set to 3 pixels.

CDrawingManager::RGBtoHSL

Converts a color from a red, green, and blue (RGB) representation to a hue, saturation, and lightness (HSL) representation.

static void __stdcall RGBtoHSL(
    COLORREF rgb,  
    double* H,  
    double* S,  
    double* L);

Parameters

Parameter	Description
[in] `rgb`	The color in RGB values.
[out] `H`	A pointer to a double where the method stores the hue for the color.
[out] `S`	A pointer to a double where the method stores the saturation for the color.
[out] `L`	A pointer to a double where the method stores the lightness for the color.

Remarks

The returned value for H is represented as a fraction between 0 and 1 where both 0 and 1 represent red. The returned values for S and L are numbers between 0 and 1.

CDrawingManager::RGBtoHSV

Converts a color from a RGB representation to a HSV representation.

static void __stdcall RGBtoHSV(
    COLORREF rgb,  
    double* H,  
    double* S,  
    double* V);

Parameters

[in] rgb
The color to convert in a RGB representation.

[out] H
A pointer to a double where this method stores the resulting hue for the color.

[out] S
A pointer to a double where this method stores the resulting saturation for the color.

[out] V
A pointer to a double where this method stores the resulting value for the color.

Remarks

The returned value for H is a number between 0 and 360 where both 0 and 360 indicate red. The return values for S and V are numbers between 0 and 1.

CDrawingManager::SetAlphaPixel

Colors a transparent pixel in a bitmap.

static void __stdcall SetAlphaPixel(
    COLORREF* pBits,  
    CRect rect,  
    int x,  
    int y,  
    int percent,  
    int iShadowSize,  
    COLORREF clrBase = (COLORREF)-1,  
    BOOL bIsRight = TRUE);

Parameters

[in] pBits
A pointer to the bit values for the bitmap.

[in] rect
A rectangular area in your application. The drawing manager draws a shadow underneath and to the right of this area.

[in] x
The horizontal coordinate of the pixel to color.

[in] y
The vertical coordinate of the pixel to color.

[in] percent
The percentage of transparency.

[in] iShadowSize
The width and height of the shadow.

[in] clrBase
The color of the shadow.

[in] bIsRight
A Boolean parameter that indicates which pixel to color. See the Remarks section for more information.

Remarks

This method is a helper method that is used by the CDrawingManager::DrawShadow method. We recommend that if you want to draw a shadow, call CDrawingManager::DrawShadow instead.

If bIsRight is set to TRUE, the pixel to color is measured x pixels from the right edge of rect. If it is FALSE, the pixel to color is measured x pixels from the left edge of rect.

CDrawingManager::SetPixel

Changes a single pixel in a bitmap to the specified color.

static void __stdcall SetPixel(
    COLORREF* pBits,  
    int cx,  
    int cy,  
    int x,  
    int y,  
    COLORREF color);

Parameters

Parameter	Description
[in] `pBits`	A pointer to the bit values of the bitmap.
[in] `cx`	The total width of the bitmap.
[in] `cy`	The total height of the bitmap.
[in] `x`	The x-coordinate of the pixel in the bitmap to change.
[in] `y`	The y-coordinate of the pixel in the bitmap to change.
[in] `color`	The new color for the pixel identified by the supplied coordinates.

CDrawingManager::SmartMixColors

Combines two colors based on a weighted ratio.

static COLORREF __stdcall SmartMixColors(
    COLORREF color1,  
    COLORREF color2,  
    double dblLumRatio = 1.,  
    int k1 = 1,  
    int k2 = 1);

Parameters

Parameter	Description
[in] `color1`	The first color to mix.
[in] `color2`	The second color to mix.
[in] `dblLumRatio`	The ratio for the new color's luminosity. `SmartMixColors` multiplies the luminosity of the mixed color by this ratio before determining a final color.
[in] `k1`	The weighted ratio for the first color.
[in] `k2`	The weighted ratio for the second color.

Return Value

A color that represents a weighted mixture of the supplied colors.

Remarks

This method fails with an error if either k1 or k2 is less than zero. If both of these parameters are set to 0, the method returns RGB(0, 0, 0).

The weighted ratio is calculated with the following formula: (color1 * k1 + color2 * k2)/(k1 + k2). After the weighted ratio is determined, the method calculates the luminosity for the mixed color. It then multiplies the luminosity by dblLumRatio. If the value is larger than 1.0, the method sets the luminosity for the mixed color to the new value. Otherwise, the luminosity is set to 1.0.

CDrawingManager::DrawRotated

Rotates a source DC content inside the given rectangle by 90 degrees.

void DrawRotated(
    CRect rectDest,  
    CDC& dcSrc,  
    BOOL bClockWise);

Parameters

rectDest
Destination rectangle.

dcSrc
The source device context.

bClockWise
TRUE indicates rotate +90 degrees; FALSE indicates rotate -90 degrees.

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CDrawingManager Class

Syntax

Members

Public Constructors

Public Methods

Remarks

Inheritance Hierarchy

Requirements

CDrawingManager::CDrawingManager

Parameters

CDrawingManager::CreateBitmap_32

Parameters

Return Value

Remarks

CDrawingManager::DrawAlpha

Parameters

Remarks

CDrawingManager::DrawEllipse

Parameters

Remarks

CDrawingManager::DrawGradientRing

Parameters

Return Value

Remarks

CDrawingManager::DrawLine, CDrawingManager::DrawLineA

Parameters

Remarks

CDrawingManager::DrawRect

Parameters

Remarks

CDrawingManager::DrawShadow

Parameters

Return Value

Remarks

Example

CDrawingManager::Fill4ColorsGradient

Parameters

Remarks

CDrawingManager::FillGradient

Parameters

Example

CDrawingManager::FillGradient2

Parameters

Remarks

Example

CDrawingManager::GrayRect

Parameters

Return Value

Remarks

CDrawingManager::HighlightRect

Parameters

Return Value

Remarks

CDrawingManager::HLStoRGB_ONE

Parameters

Return Value

Remarks

CDrawingManager::HLStoRGB_TWO

Parameters

Return Value

Remarks

CDrawingManager::HSVtoRGB

Parameters

Return Value

Remarks

CDrawingManager::HuetoRGB

Parameters

Return Value

Remarks

CDrawingManager::MirrorRect

Parameters

Remarks

CDrawingManager::PixelAlpha

Parameters

Return Value

Remarks

CDrawingManager::PrepareShadowMask

Parameters

Return Value