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Line Segments (ifm::Line)

ifm::Line l ( int x1, int y1, int x2, int y2);
	Creates a line from (x1, y1) to (x2, y2).

int	l.x1 ()	Returns x-coordinate of the first endpoint.
int	l.y1 ()	Returns y-coordinate of the first endpoint.
int	l.x2 ()	Returns x-coordinate of the second endpoint.
int	l.y2 ()	Returns y-coordinate of the second endpoint.

Example

The following code draws a line segment from (100, 100) to (200, 200) and waits for a mouseclick to finish.

#include <IFM/window>

int main()
{
    ifm::wio << ifm::Line(100, 100, 200, 200) << ifm::flush;
    ifm::wio.wait_for_mouse_click();
    return 0;
}

Notes

Line Segments are somewhat special in X, since they do not include their endpoints, but only the grid points in between. So if you write

    ifm::wio << ifm::Line(100, 100, 200, 100) 
             << ifm::Line(201, 100, 300, 100) 
             << ifm::flush;

there does not appear a continuous line segment (100, 100) $$  (300, 100), it will have a one-pixel gap in the middle.

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Next: Class declaration of ifm::Rectangle

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Michael Hoffmann. Wed, November 17, 2004.