This function stores an arbitrary line of pixels in the DIB image bitmap of the image referenced by HIGEAR.
Declaration:
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AT_ERRCOUNT ACCUAPI IG_DIB_line_set ( HIGEAR hIGear,
PIXPOS nX1,
AT_PIXPOS nY1,
AT_PIXPOS nX2,
AT_PIXPOS nY2,
const LPAT_PIXEL lpPixel,
AT_DIMENSION nNumPixels
);
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Arguments:
| hIGear | HIGEAR handle of image to which to transfer pixels. |
| nX1 | X coordinate of the first endpoint of line to store. |
| nY1 | Y coordinate of the first endpoint. |
| nX2 | X coordinate of the second endpoint of line to store. |
| nY2 | Y coordinate of the second endpoint. |
| lpPixel | Far pointer to your data area containing the pixels to be stored. |
| nNumPixels | Number of pixels (not bytes) to be transferred. |
Return Value:
Returns the number of ImageGear errors that occurred during this function call. If there are no errors, the return value is IGE_SUCCESS.
Supported Raster Image Formats:
All pixel formats supported by ImageGear Professional.
Sample:
Pixel Access
Example:
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HIGEAR hIGear; /* HIGEAR handle of image */ AT_PIXEL cPixArray[400]; /* Receives the returned pixels */ AT_PIXPOS nXleft, nYtop, /* Coordinates of upper-left end of line*/ nXright, nYbot; /* Coordinates of the lower-right end */ AT_DIMENSION nFetched; /* Holds the count of pixels retrieved */ AT_ERRCOUNT nErrcount; /* Receives the returned error counts */ /* Fetch a diagonal line, from Coordinates (0,0) to (100,100): */ nXleft = 0; nYtop = 0; /* Diagonal line from upper left corner */ nXright = 100; nYbot = 100; nErrcount = IG_DIB_line_get ( hIGear, nXleft, nYtop, nXright, nYbot, &cPixArray[0], 400, &nFetched ); ... /* Now restore the line: */ nErrcount = IG_DIB_line_set ( hIGear, nXleft, nYtop, nXright, nYbot, &cPixArray[0], nFetched ); |
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Remarks:
The line does not have to be horizontal or vertical. (nX1,nY1) are the coordinates of one endpoint of the line and (nX2,nY2) are of the other.
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ImageGear's pixel access functions consider the coordinates (0,0) to refer to the upper left-hand corner of the bitmap data. They do not follow the DIB's orientation, which considers (0,0) to refer to the lower left-hand corner of the bitmap. |
If the image you are modifying is 1-bit, you must convert the image from run-end encoded to a standard DIB before you can set pixel values. Please see the section Using Pixel Access Functions with ImageGear for details.
1-bit and 4-bit pixels should be provided one to a byte, right justified (that is, in the least significant bits of the byte). 24 bit pixels should be 3 bytes per pixel, in Blue-Green-Red order.
To calculate the number of pixels that your line will consist of, use the following formula:
max((1+abs(x2-x1)), (1+abs(y2-y1)))