screen_2 - Procedure

2 pointer positions in window coordinates


Description

Returns 2 positions entered by the user using the pointer (ie. mouse). Both positions are relative to X=Y=0 in the current graphical window (pixels). First position is recorded when the button is pressed and second position when the button is released. Different graphical traces or outlines of the pointer motion is available through the mode parameter.

Syntax

pos_2(win_id, p1, p2, mode)

INT	win_id;
VECTOR	p1;
VECTOR	p2;
INT	mode;

Principal parameters

win_id	- ID of window
p1	- First position
p2	- Second position

Optional parameters

mode	- 0 = No outline
	- 1 = Rectangle (Default)
	- 2 = Dashed line
	- 3 = Arrow

Comments

If the pointer button is released without having moved the pointer, screen_2 returns p1=p2.