TBitmap

Fuente: source/classes/bitmap.prg

Inherits from: TControl

TBitmap is a control that displays a bitmap image from a file, resource, or handle. It supports zoom, transparency, alpha blending, stretch modes, and scrollable large images. The control can display BMP files embedded as resources or loaded from disk.

Key DATA Members

DATA	Type	Description
`hBitmap`	Handle	Handle to the bitmap GDI object
`hPalette`	Handle	Handle to the bitmap color palette
`cBmpFile`	Character	Bitmap file path on disk
`cResName`	Character	Bitmap resource name embedded in the EXE
`nZoom`	Numeric	Zoom factor (1 = original size)
`lTransparent`	Logical	Enable transparent background drawing
`lStretch`	Logical	Stretch bitmap to fit the control dimensions
`nImgWidth`	Numeric	Original bitmap width in pixels
`nImgHeight`	Numeric	Original bitmap height in pixels
`lHasAlpha`	Logical	Whether the bitmap has an alpha channel
`aHotAreas`	Array	Array of clickable hot areas on the bitmap

Methods

Method	Description
`New( nTop, nLeft, nW, nH, cRes, cFile, lNoBorder, oWnd, bLClicked, bRClicked, lScroll, lStretch, oCursor, cMsg, lUpdate, bWhen, lPixel, bValid, lDesign )`	Create a new bitmap control
`ReDefine( nId, cRes, cFile, oWnd, ... )`	Redefine from a dialog resource placeholder
`LoadImage( cResName, cBmpFile )`	Load bitmap from resource name or disk file
`LoadBMP( cBmpFile )`	Load a bitmap from disk by filename
`SetBMP( cResName )`	Load a bitmap from a resource name
`Zoom( nZoom )`	Set zoom level (1=100%, 2=200%, etc.)
`SaveToBmp( cFile )`	Save the current bitmap to a file on disk
`Paint()`	Draw the bitmap onto the control surface
`Center()`	Center the bitmap within the control area
`CopyToClipboard()`	Copy bitmap image to the clipboard
`HasAlpha()`	Check if the bitmap has an alpha channel

Example: Load and Display a Bitmap

#include "FiveWin.ch"

function Main()

   local oWnd, oBmp

   DEFINE WINDOW oWnd TITLE "TBitmap Demo" SIZE 600, 450

   @ 10, 10 BITMAP oBmp OF oWnd ;
      FILE "c:\fwh\bitmaps\olga1.bmp" ;
      SIZE 300, 200

   ACTIVATE WINDOW oWnd CENTERED

return nil

Notes

Use the BITMAP ... FILE cFile clause to load from disk, or BITMAP ... RESOURCE cRes for embedded resources.
The nWidth and nHeight access methods return the zoomed bitmap dimensions automatically based on the original image size and ::nZoom.
Enable lScroll to show scrollbars when the bitmap is larger than the control area. Use lStretch to fit the bitmap to the control rectangle.
The aHotAreas array can define clickable regions on the bitmap for interactive image maps.

TBitmap

Key DATA Members

Methods

Example: Load and Display a Bitmap

Notes

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