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PointInImage.md

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NAME

PointInImage -- Tests whether an image "contains" a point. (V36)

SYNOPSIS

    DoesContain = PointInImage( Point, Image )
    D0                          D0     A0

    BOOL PointInImage( struct Point, struct Image * );

Links: Image Image

FUNCTION

Tests whether a point is properly contained in an image. The intention of this is to provide custom gadgets a means to delegate "image mask" processing to the Image, where it belongs (superceding things like BOOLMASK). After all, a rounded rect image with a drop shadow knows more about what points are inside it than anybody else should.

For traditional Intuition Images, this routine checks if the point is in the Image box (LeftEdge/RightEdge/Width/Height).

INPUTS

Point - Two words, X/Y packed into a LONG, with high word containing 'X'. This is what you get if you pass a Point structure (not a pointer!) using common C language parameter conventions. Image - a pointer to a standard or custom Image data object. NOTE: If 'Image' is NULL, this function returns TRUE.

RESULT DoesContain - Boolean result of the test.

EXAMPLE

NOTES

BUGS Only applies to the first image, does not follow NextImage linked list. This might be preferred.

SEE ALSO