public function Line
Prototype:
public function Line(x1,y1,x2,y2);
Parameters
x1
the x1 coordinate of the line
y1
the y1 coordinate of the line
x2
the x2 coordinate of the line
y2
the y2 coordinate of the line
Description:
Draws a line from (x1, y1) to (x2, y2).
Return value:
Returns null.