gtypes.h

This interface defines types for representing points, dimensions, and rectangles.

Types
GPoint	This type contains real-valued x and y fields.
GDimension	This type contains real-valued width and height fields.
GRectangle	This type contains real-valued x, y, width, and height fields.
Functions
createGPoint(x, y)	Creates a `GPoint` structure with the specified `x` and `y` coordinates.
getX(pt)	Returns the x component of the `GPoint`.
getY(pt)	Returns the y component of the `GPoint`.
createGDimension(width, height)	Creates a `GDimension` value with the specified `width` and `height` coordinates.
getWidth(dim)	Returns the width component of the `GDimension`.
getHeight(dim)	Returns the width component of the `GDimension`.
createGRectangle(x, y, width, height)	Creates a `GRectangle` value with the specified components.
getX(r)	Returns the x component of the rectangle.
getY(r)	Returns the y component of the rectangle.
getWidth(r)	Returns the width component of the `GRectangle`.
getHeight(r)	Returns the width component of the `GRectangle`.
isEmpty(r)	Returns `true` if the rectangle is empty.
contains(r, pt)	Returns `true` if the rectangle contains the given point.

Type detail

typedef struct {
   double x;
   double y;
} GPoint;

This type contains real-valued x and y fields. It is used to represent a location on the graphics plane.

typedef struct {
   double width;
   double height;
} GDimension;

This type contains real-valued width and height fields. It is used to indicate the size of a graphical object.

typedef struct {
   double x;
   double y;
   double width;
   double height;
} GRectangle;

This type contains real-valued x, y, width, and height fields. It is used to represent the bounding box of a graphical object.

GPoint createGPoint(double x, double y);

Creates a GPoint structure with the specified x and y coordinates.

Usage:

pt = createGPoint(x, y);

double getX(GPoint pt);

Returns the x component of the GPoint.

Usage:

x = getX(pt);

double getY(GPoint pt);

Returns the y component of the GPoint.

Usage:

y = getY(pt);

GDimension createGDimension(double width, double height);

Creates a GDimension value with the specified width and height coordinates.

Usage:

dim = createGDimension(width, height);

double getWidth(GDimension dim);

Returns the width component of the GDimension.

Usage:

width = getWidth(dim);

double getHeight(GDimension dim);

Returns the width component of the GDimension.

Usage:

width = getHeight(dim);

GRectangle createGRectangle(double x, double y, double width, double height);

Creates a GRectangle value with the specified components.

Usage:

r = createGRectangle(x, y, width, height);

double getX(GRectangle r);

Returns the x component of the rectangle.

Usage:

double x = getX(r);

double getY(GRectangle r);

Returns the y component of the rectangle.

Usage:

double y = getY(r);

double getWidth(GRectangle r);

Returns the width component of the GRectangle.

Usage:

width = getWidth(r);

double getHeight(GRectangle r);

Returns the width component of the GRectangle.

Usage:

width = getHeight(r);

bool isEmpty(GRectangle r);

Returns true if the rectangle is empty.

Usage:

if (isEmpty(r)) . . .

bool contains(GRectangle r, GPoint pt);

Returns true if the rectangle contains the given point.

Usage:

if (contains(r, pt)) . . .