, (), , . C , , , , , , ( ). ( , Window):
add_to_selections (shape, self)
struct Window* self;
struct Shape* shape;
, C, ( ), ( ) ( ). . , - , . C , ; . () :
static struct Window outer_window = {0.0, 0.0, 8.5, 11.0};
, , (&outer_window).
. , . , , ( ), . , , , , ; , .
, . ( malloc alloc) . , ( free). :
struct Window* create_window(xmin, ymin, width, height);
Length xmin, ymin, width, height;
{
struct Window* window;
|
|
|
/* */
window = (struct Window*)malloc(sizeof(struct Window));
/* */
window-> xmin = xmin;
window-> ymin = ymin;
window-> xmax = xmin + width;
window-> ymax = ymin + height;
return window;
};
free , .
C . , , Box Circle Shape. C :
struct Shape
{
struct ShapeClass* class;
Length x;
Length y;
};
struct Box
{
struct BoxClass* class;
Length x;
Length y;
Length width;
Length height;
};
struct Circle
{
struct CircleClass* class;
Length x;
Length y;
Length radius;
};
Box Circle , Shape, Box Circle Shape ( Box Circle Shape).
