Points, Rectangles and Regions simple graphical data types. GDK provides the #GdkPoint, #GdkRectangle and #GdkRegion data types for representing pixels and sets of pixels on the screen. #GdkPoint is a simple structure containing an x and y coordinate of a point. #GdkRectangle is a structure holding the position and size of a rectangle. The intersection of two rectangles can be computed with gdk_rectangle_intersect(). To find the union of two rectangles use gdk_rectangle_union(). #GdkRegion is an opaque data type holding a set of arbitrary pixels, and is usually used for clipping graphical operations (see gdk_gc_set_clip_region()). Defines the x and y coordinates of a point. Note that both are defined as #gint16 values, so the coordinates are limited to between -32,768 and 32,767. @x: the x coordinate of the point. @y: the y coordinate of the point. Defines the position and size of a rectangle. @x: the x coordinate of the left edge of the rectangle. @y: the y coordinate of the top of the rectangle. @width: the width of the rectangle. @height: the height of the rectangle. Calculates the intersection of two rectangles. @src1: a #GdkRectangle. @src2: a #GdkRectangle. @dest: the intersection of @src1 and @src2. @Returns: TRUE if the rectangles intersect. Calculates the union of two rectangles. The union of rectangles @src1 and @src2 is the smallest rectangle which includes both @src1 and @src2 within it. @src1: a #GdkRectangle. @src2: a #GdkRectangle. @dest: the union of @src1 and @src2. A GdkRegion represents a set of pixels on the screen. The only user-visible field of the structure is the user_data member, which can be used to attach arbitrary data to the #GdkRegion. @user_data: arbitrary data attached to the #GdkRegion. Creates a new empty #GdkRegion. @Returns: a new empty #GdkRegion. Creates a new #GdkRegion using the polygon defined by a number of points. @points: an array of #GdkPoint structs. @npoints: the number of elements in the @points array. @fill_rule: specifies which pixels are included in the region when the polygon overlaps itself. @Returns: a new #GdkRegion based on the given polygon. The method for determining which pixels are included in a region, when creating a #GdkRegion from a polygon. The fill rule is only relevant for polygons which overlap themselves. @GDK_EVEN_ODD_RULE: areas which are overlapped an odd number of times are included in the region, while areas overlapped an even number of times are not. @GDK_WINDING_RULE: overlapping areas are always included. Destroys a #GdkRegion. @region: a #GdkRegion. Returns the intersection of two regions. @source1: a #GdkRegion. @source2: a #GdkRegion. @Returns: the intersection of @source1 and @source2. Returns the union of two regions. This is all pixels in either of @source1 or @source2. @source1: a #GdkRegion. @source2: a #GdkRegion. @Returns: the union of @source1 and @source2. Subtracts one region from another. The result is a region containing all the pixels which are in @source1, but which are not in @source2. @source1: a #GdkRegion. @source2: a #GdkRegion to subtract from @source1. @Returns: @source1 - @source2. Returns the difference between the union and the intersection of two regions. This is a region containing the pixels that are in one of the source regions, but which are not in both. @source1: a #GdkRegion. @source2: a #GdkRegion. @Returns: the difference between the union and the intersection of @source1 and @source2. Returns the union of a region and a rectangle. @region: a #GdkRegion. @rect: a #GdkRectangle. @Returns: the union of @region and @rect. Moves a region the specified distance. @region: a #GdkRegion. @dx: the distance to move the region horizontally. @dy: the distance to move the region vertically. Resizes a region by the specified amount. Positive values shrink the region. Negative values expand it. @region: a #GdkRegion. @dx: the number of pixels to shrink the region horizontally. @dy: the number of pixels to shrink the region vertically. Returns TRUE if the #GdkRegion is empty. @region: a #GdkRegion. @Returns: TRUE if @region is empty. Returns TRUE if the two regions are the same. @region1: a #GdkRegion. @region2: a #GdkRegion. @Returns: TRUE if @region1 and @region2 are equal. Returns TRUE if a point is in a region. @region: a #GdkRegion. @x: the x coordinate of a point. @y: the y coordinate of a point. @Returns: TRUE if the point is in @region. Tests whether a rectangle is within a region. @region: a #GdkRegion. @rect: a #GdkRectangle. @Returns: GDK_OVERLAP_RECTANGLE_IN, GDK_OVERLAP_RECTANGLE_OUT, or GDK_OVERLAP_RECTANGLE_PART, depending on whether the rectangle is inside, outside, or partly inside the #GdkRegion, respectively. Specifies the possible values returned by gdk_region_rect_in(). @GDK_OVERLAP_RECTANGLE_IN: if the rectangle is inside the #GdkRegion. @GDK_OVERLAP_RECTANGLE_OUT: if the rectangle is outside the #GdkRegion. @GDK_OVERLAP_RECTANGLE_PART: if the rectangle is partly inside the #GdkRegion. Returns the smallest rectangle which includes the entire #GdkRegion. @region: a #GdkRegion. @rectangle: returns the smallest rectangle which includes all of @region.