L_EfxPaintTransition

#include "l_bitmap.h"

L_LTEFX_API L_INT L_EfxPaintTransition(hDC, uTransition, crBack, crFore, uSteps, pDest, uEffect, uGrain, uDelay, nSpeed, nCycles, uPass, uMaxPass, fTransparency, crTransparency, uWandWidth, crWand, uROP)

HDC hDC;

handle to the target device context

L_UINT uTransition;

filling style

COLORREF crBack;

background color

COLORREF crFore;

foreground color

L_UINT uSteps;

number of gradient color steps

RECT *pDest;

pointer to the display rectangle

L_UINT uEffect;

effect to apply when painting

L_UINT uGrain;

graining size

L_UINT uDelay;

delay between graining steps

L_INT nSpeed;

/* speed of the wave */ 

L_INT nCycles;

number of cycles or repetitions

L_UINT uPass;

pass number when using a pattern brush

L_UINT uMaxPass;

maximum passes for a pattern brush

L_BOOL fTransparency;

transparency paint flag

COLORREF crTransparency;

transparency paint color

L_UINT uWandWidth;

wand width

COLORREF crWand;

wand color

L_UINT32 uROP;

Windows ROP code for display

Draws a rectangle into the target device context with the specified fill pattern and color while using a special effect.

Parameter

Description

hDC

Handle to the target device context.

uTransition

Filling style during transition. For valid values, refer to Effect Transition Filling Styles.

crBack

COLORREF value that specifies the background color. If a gradient transition is specified in the uTransition parameter, this is the beginning color for the gradient transition. Otherwise, it is the only color that is used.

crFore

COLORREF value that specifies the foreground color. If a gradient transition is specified in the uTransition parameter, this is the ending color for the gradient transition. Otherwise, this color is not used.

uSteps

Number of gradient color steps. This parameter is used only if a gradient transition is specified in the uTransition parameter. Valid values are 2 to 256.

pDest

Pointer to the display destination rectangle.

uEffect

Effect to apply when painting. For valid values, refer to Effect Types.

uGrain

This is the smallest size (pixel width or height) to be updated when painting an effect. Using a small grain makes the painting smoother, but takes longer to paint. Using a large grain makes the painting more coarse, but paints faster. If the uEffect parameter is from the Wave class this represents the duration or height of the wave. Valid values are 1 to 256.

uDelay

Delay between graining steps, in milliseconds.

nSpeed

Speed of the wave. Valid values are 1 to 256. This parameter is valid only if the uEffect parameter is from the Wave class.

nCycles

Number of cycles or repetitions used to draw the wave. This parameter is valid only if the uEffect parameter is from the Wave class.

uPass

Pass number when using a pattern brush. Use 1 for painting in one pass.

uMaxPass

Maximum passes for a pattern brush. Use 1 for painting in one pass.

fTransparency

TRUE to implement transparency by not painting pixels of the color specified in the crTransparency parameter; FALSE if transparency is not implemented.

crTransparency

COLORREF value that specifies the transparency paint color.

uWandWidth

Wand width, in pixels.

crWand

COLORREF value that specifies the wand color.

uROP

Windows ROP code for display. This parameter takes the same codes as the Windows BitBlt function. For ordinary painting, use SRCCOPY.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

Use this function to create a special effect screen transition before painting the next image.

Use the uGrain and uDelay parameters to control the speed of the display. The uGrain parameter controls the size of the painting increment, and uDelay controls the time between increments.

The wand is a solid color bar that moves during an effect. Small grain sizes produce the best wand effects. Many of the effects listed in Effect Types can have a wand.

Use the uPass and uMaxPass parameters to paint the image in more than one pass. For example, if you want a 3-pass paint, use uMaxPass of 3 and paint 3 times, once with uPass = 1, once with uPass = 2, and once with uPass = 3.

For general information, refer to Implementing Special Effects.

Multipass painting for the EFX_EFFECT_PUSH_CLASS is disabled.

If the uEffect parameter is from the Twirl class, White Turnover class, Turnover class, Replace class, Laser class, Fade Normal class, Fade Black and White class, Fade Color class or Wave class, the uPass and uMaxPass parameters have no effect.

If the uEffect parameter is from the Fade Normal class, Fade Black and White class or Fade Color class, the uGrain parameter has no effect. However, if the uEffect parameter is from the Wave class, the uGrain parameter contains the wave size.

If the uEffect parameter is from the White Turnover class, the Turnover class or the Replace class, the uWandWidth and crWand parameters have no effect. However, if the uEffect parameter is from the Fade Color class, the crWand parameter contains the bitmap color level.

The nSpeed and nCycles parameters are valid only if the uEffect parameter is from the Wave class.

Required DLLs and Libraries

LTEFX

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

See Also

Functions:

L_EfxDraw3dShape, L_EfxDraw3dText, L_EfxDrawFrame, L_EfxDrawRotated3dText, L_EfxEffectBlt, L_EfxGradientFillRect, L_EfxPaintBitmap, L_EfxPatternFillRect, L_EfxTileRect

Topics:

Implementing Special Effects

 

Using Color Values in LEADTOOLS

Example

This example shows the minimum requirements for using L_EfxPaintTransition.

L_INT EfxPaintTransitionExample(HWND hWnd,RECT*    pDest) 
{ 
  L_INT nRet; 
  HDC       hdc;                    /* Device context for the current window */ 
  HPALETTE  hSavedPalette = NULL;   /* Temporary copy of the current system palette */ 
  HPALETTE  hOurPalette = NULL;     /* The palette that we will use to paint */ 
  L_INT     nBitsPerPixel; 
 
  /* Get the device context */ 
  hdc = GetDC (hWnd); 
  /* Check the device to see if we need a palette */ 
  nBitsPerPixel = GetDeviceCaps( hdc, BITSPIXEL ) * GetDeviceCaps ( hdc, PLANES ); 
  if ( nBitsPerPixel <=8 ) 
  { 
    hOurPalette = (HPALETTE)GetStockObject (DEFAULT_PALETTE); 
    hSavedPalette = SelectPalette (hdc, hOurPalette, FALSE); 
    /* Realize our palette */ 
    RealizePalette (hdc);  
  } 
  /* Paint the transition in 3 steps */ 
  nRet = L_EfxPaintTransition (hdc,                 /* device context */ 
                              EFX_TRANS_GRADIENT_LINE_R_TO_L,    /* transition effect to paint */ 
                              RGB ( 255,0,0 ),     /* background color, red */ 
                              RGB ( 0,0,255 ),     /* foreground color, blue */ 
                              12,                  /* gradient color steps */ 
                              pDest,               /* destination rectangle */ 
                              EFX_EFFECT_WIPE_RECTANGLE_IN,  /* effect to apply when painting the transition */ 
                              4,                   /* graining size */ 
                              10,                  /* delay between graining steps */ 
                              0,                   /* speed of the wave */ 
                              0,                   /* number of cycles or repetitions */           
                              1,                   /* step number for the pattern brush */ 
                              3,                   /* maximum steps for the pattern brush */ 
                              FALSE,               /* do not use transparency */ 
                              0,                   /* no transparent color */ 
                              0,                   /* wand width */ 
                              0,                   /* no wand color */ 
                              SRCCOPY );           /* Windows raster operation code */ 
  if(nRet != SUCCESS) 
     return nRet; 
 
  nRet = L_EfxPaintTransition ( hdc,                /* device context */ 
                               EFX_TRANS_GRADIENT_LINE_R_TO_L,    /* transition effect to paint */ 
                               RGB ( 255,0,0 ),    /* background color, red */ 
                               RGB ( 0,0,255 ),    /* foreground color, blue */ 
                               12,                 /* gradient color steps */ 
                               pDest,              /* destination rectangle */ 
                               EFX_EFFECT_WIPE_RECTANGLE_OUT,  /* effect to apply when painting the transition */ 
                               4,                  /* graining size */ 
                               10,                 /* delay between graining steps */ 
                               0,                  /* speed of the wave */         
                               0,                  /* number of cycles or repetitions */           
                               2,                  /* step number for the pattern brush */ 
                               3,                  /* maximum steps for the pattern brush */ 
                               FALSE,              /* do not use transparency */ 
                               0,                  /* no transparent color */ 
                               0,                  /* wand width */ 
                               0,                  /* no wand color */ 
                               SRCCOPY );          /* Windows raster operation code */ 
  if(nRet != SUCCESS) 
     return nRet; 
  nRet = L_EfxPaintTransition (hdc,                 /* device context */ 
                              EFX_TRANS_GRADIENT_LINE_R_TO_L,    /* transition effect to paint */ 
                              RGB ( 255,0,0 ),     /* background color, red */ 
                              RGB ( 0,0,255 ),     /* foreground color, blue */ 
                              12,                  /* gradient color steps */ 
                              pDest,               /* destination rectangle */ 
                              EFX_EFFECT_WIPE_CIRCLE_C_CW_FROM_L,  /* effect to apply when painting the transition */ 
                              4,                   /* graining size */ 
                              10,                  /* delay between graining steps */ 
                              0,                   /* speed of the wave */ 
                              0,                   /* number of cycles or repetitions */           
                              3,                   /* step number for the pattern brush */ 
                              3,                   /* maximum steps for the pattern brush */ 
                              FALSE,               /* do not use transparency */ 
                              0,                   /* no transparent color */ 
                              0,                   /* wand width */ 
                              0,                   /* no wand color */ 
                              SRCCOPY );           /* Windows raster operation code */ 
  if(nRet != SUCCESS) 
     return nRet; 
 
  /* Restore the old palette */ 
  if  ( hOurPalette ) 
     SelectPalette (hdc, hSavedPalette, FALSE); 
  /* Release the device context */ 
  ReleaseDC ( hWnd, hdc ); 
   return SUCCESS; 
} 

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