scbutil.h File Reference

#include <glib.h>
#include "scbtype.h"
#include "scbpoint.h"

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Functions
G_BEGIN_DECLS gboolean	erscribble_is_rect_intersect (const ScbRectPtr rect1, const ScbRectPtr rect2)
gboolean	erscribble_is_lines_intersect (const ScbPointPtr p1, const ScbPointPtr p2, const ScbPointPtr p3, const ScbPointPtr p4)

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Function Documentation

gboolean erscribble_is_lines_intersect	(	const ScbPointPtr	p1,
		const ScbPointPtr	p2,
		const ScbPointPtr	p3,
		const ScbPointPtr	p4
	)

Definition at line 84 of file scbutil.c.

References CCW().

Referenced by erscribble_stroke_line_hit_test().

{
    gboolean bRet = ((( CCW(p1, p2, p3) * CCW(p1, p2, p4)) <= 0)
        && (( CCW(p3, p4, p1) * CCW(p3, p4, p2)  <= 0) )) ;

   
    return bRet;
}

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G_BEGIN_DECLS gboolean erscribble_is_rect_intersect	(	const ScbRectPtr	rect1,
		const ScbRectPtr	rect2
	)

Copyright (C) 2008 iRex Technologies B.V. All rights reserved.

Definition at line 71 of file scbutil.c.

References _ScbRect::bottom, _ScbRect::left, _ScbRect::right, and _ScbRect::top.

Referenced by erscribble_stroke_line_hit_test(), and erscribble_stroke_point_hit_test().

{
    // check two rectangles is intersect or not, 
    // these two rectangles should be normalized.
    return ! ( r2->left > r1->right 
        || r2->right < r1->left 
        || r2->top > r1->bottom 
        || r2->bottom < r1->top 
        );
}

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