Call the SetRect function to set the rectangular area.

Rectangle and area

Windows contains several plotting functions that use the RECT (rectangle) structure and the RGN area. An area is a part of the screen. It is a combination of rectangle, polygon, and elliptic.

The following three plot functions need a pointer to the rectangle structure:

In these functions, the rect parameter is a RECT structure, which contains four fields: left, top, right, and bottom. The coordinates in this structure are treated as logical coordinates.

FillRect uses a designated image brush to fill in the rectangle. This function does not need to first select the image brush into the device content.

FrameRect draws a rectangular box with a paint brush, but does not fill in a rectangle. It looks a little strange to use a paint brush to draw a Rectangle, because the edges of the introduced functions (such as Rectangle) are all drawn with the current paint brush. FrameRect allows users to draw a rectangle box that is not necessarily a solid color. The boundary is a logical unit element width. If the logical unit is greater than the device unit, the border box is 2 pixels wide or wider.

InvertRect switches all pixels in the rectangle, 1 to 0, 0 to 1, this function turns the white area into black, the black area into white, the green area into the magenta.

You can call the SetRect function to set the rectangular area:

SetRect (& rect, xLeft, yTop, xRight, yBottom );

The following eight functions facilitate some basic operations.

Move the X axis and Y axis of the rectangular eye to several units:

OffsetRect (& rect, x, y );

Increase or decrease the rectangle size:

InflateRect (& rect, x, y );

Each field in the rectangle is set to 0:

SetRectEmpty (& rect );

Copy the rectangle to another rectangle:

CopyRect (& DestRect, & SrcRect );

Obtain the intersection of two rectangles:

IntersectRect (& DestRect, & SrcRect1, & SrcRect2 );

Get a collection of two rectangles:

UnionRect (& DestRect, & SrcRect1, & SrcRect2 );

Determine whether the rectangle is empty:

BEmpty = IsRectEmpty (& rect );

Determine whether the vertex is in the rectangle:

BInRect = PtInRect (& rect, point );

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