Mouse Input

Read Mouse

  int W.read_mouse();

MOUSE_BUTTON(1): left button, MOUSE_BUTTON(2): middle button, MOUSE_BUTTON(3): right button

Numbers of panel buttons can be defined by the user.

Example

The following simple program demonstrates the operation. Any click of a mouse button stops the program. On the right there is a screenshot of the program. Clicking on the picture shows the window in original size.

#include <LEDA/graphics/window.h>

using namespace leda;

int main()
{
  window W(500,500);W.init(-10,+10,-10);	
  W.display(window::center,window::center);
  W.draw_disc(0,0,5,red);

  W.read_mouse();

  W.screenshot("trivial_mouse_input");

  return 0;
}

Get Mouse

	int W.get_mouse()

Example

The following program draws random points. It uses W.get_mouse() at the beginning of every execution of the main loop to check whether a mouse button has been clicked or not. If the right button has been clicked the loop is terminated. If the left button has been clicked the drawing area of W is cleared.

On the right there is a screenshot of the program. Clicking on the picture shows the window in original size.

#include <LEDA/window.h>
#include <LEDA/random_source.h>

using namespace leda;

random_source& operator>>(random_source& ran, point& p)
{	
  int x,y;
  ran >> x >> y;
  p=point(x,y);
  return ran;
}

int main()
{
  window W(400,400);
  W.display(window::center,window::center);
  W.message("left button: clear    right button: stop");

  random_source ran(0,100);

  int but;
  while ((but=W.get_mouse())!=MOUSE_BUTTON(3)) {
    if (but==MOUSE_BUTTON(1)) {
      W.screenshot("get_mouse");
      W.clear();
    }
			
    point p;
    ran >> p;
    W.draw_point(p,blue);
  }

  return 0;
}