The Window Class (IfmWindow)

Definition

Creation

IfmWindow w ( string str = "IFM Window");
	Creates a window with dimensions (512 x 512) and name str and positions it with upper left corner (100, 100) on the X display (your screen).
IfmWindow w ( int xsize, int ysize, string str = "IFM Window");
	Precondition: 10 $$ xsize, ysize $$ 2048. Creates a window with dimensions (xsize x ysize) and name str and positions it with upper left corner (100, 100) on the X display (your screen).
IfmWindow w ( int xpos, int ypos, int xsize, int ysize, string str);
	Precondition: 10 $$ xsize, ysize $$ 2048. Creates a window with dimensions (xsize x ysize) and name str and positions it with upper left corner (xpos, ypos) on the X display (your screen).
IfmWindow w ( IfmWindow);
	copy constructor.

IfmWindow&

w = IfmWindow

copy assignment.

Operations

int	w.xmin ()	returns minimal x-xoordinate in w.
int	w.xmax ()	returns maximal x-xoordinate in w.
int	w.ymin ()	returns minimal y-xoordinate in w.
int	w.ymax ()	returns maximal y-xoordinate in w.
IfmWindow&	& w << IfmDrawable d
		d is drawn into w.
IfmWindow&	& w >> IfmGetable d
		d is set from w.
IfmWindow&	w.flush ()	Buffer is flushed and all output drawn onto the display. Returns w.
IfmWindow&	w.endl ()	same as flush.
IfmWindow&	w.sync ()	Buffer is flushed, all output is drawn onto the display and all pending X-requests have been processed. Returns w.
IfmWindow&	w.clear ()	Clears the window and flushes the buffer. Returns w.
IfmWindow&	w.wait ( unsigned long microsec)
		Flushes buffer and waits for microsec microseconds.
bool	w.check_key ()	Returns true, iff there is a KeyRelease event pending.
bool	w.check_mouse ()	Returns true, iff there is a MouseMotion event pending.
bool	w.check_mouse_click ()
		Returns true, iff there is a ButtonRelease event pending.
int	w.get_key ()	Flushes buffer, waits for a KeyRelease event and returns the pressed key's ASCII-code. (65 $$  A, 97 $$  a). Expose events during the waiting period are handled.
void	w.get_mouse ( int& x, int& y)
		Flushes buffer, waits for a MouseMotion event and sets (x, y) to the mouse position. Expose events during the waiting period are handled.
int	w.get_mouse_click ( int& x, int& y)
		Flushes buffer, waits for a ButtonRelease event, sets (x, y) to the mouse position and returns the number of the pressed mouse button. (1 $$  left, 2 $$  middle, 3 $$  right). Expose events during the waiting period are handled.
void	w.wait_for_mouse_click ( int button = 0)
		Precondition: 0 $$ button $$ 3. Flushes buffer and waits until specified (0 $$  any) mouse button gets released. Expose events during the waiting period are handled.
IfmWindow&	w.set_draw_mode ( int m)
		Drawing mode is set to m. (Possible values include GXcopy, GXxor, GXand, ....) Returns w.
IfmWindow&	w.set_line_width ( int w)
		Precondition: w $$> 0. Drawing line width is set to w. Returns w.
int	w.number_of_colors ()
		Returns the number of available colors.
IfmWindow&	w.set_color ( int c)
		Precondition: 0 $$ c $$ number_of_colors(). Drawing color is set to c. The last two colors are always black and white, i.e. set_color( number_of_colors()) selects black. The rest is evenly divided by interpolating the following colors in order: red, orange, yellow, green, blue, magenta and purple. Returns w.

Example

#include <ifmwindow>

int main()
{
  // define a 200 x 200 pixel window  
  IfmWindow w(200, 200, "LibWindow-Example");

  // read in a circle
  Circle c;
  w >> c;
  
  // print c and its bounding square
  w << yellow << c << red
    << Rectangle(c.x() - c.r(), c.y() - c.r(),
		 c.x() + c.r(), c.y() + c.r())
    << flush;

  // tracks mouse pointer
  Point p_last(c.x(), c.y());
  do {
    int x, y;
    w.get_mouse(x, y);
    w << blue << Line(p_last.x(), p_last.y(), x, y) << flush;
    p_last = Point(x, y);
  } while (!w.check_mouse_click());
}