-static guint32 pick_corner(int x, int y, int cx, int cy, int cw, int ch)
-{
- if (x - cx > cw / 2) {
- if (y - cy > ch / 2)
- return prop_atoms.net_wm_moveresize_size_bottomright;
- else
- return prop_atoms.net_wm_moveresize_size_topright;
- } else {
- if (y - cy > ch / 2)
- return prop_atoms.net_wm_moveresize_size_bottomleft;
- else
- return prop_atoms.net_wm_moveresize_size_topleft;
- }
+static guint32 pick_corner(gint x, gint y, gint cx, gint cy, gint cw, gint ch)
+{
+ /* let's make x and y client relative instead of screen relative */
+ x = x - cx;
+ y = ch - (y - cy); /* y is inverted, 0 is at the bottom of the window */
+
+#define X x*ch/cw
+#define A -4*X + 7*ch/3
+#define B 4*X -15*ch/9
+#define C -X/4 + 2*ch/3
+#define D X/4 + 5*ch/12
+#define E X/4 + ch/3
+#define F -X/4 + 7*ch/12
+#define G 4*X - 4*ch/3
+#define H -4*X + 8*ch/3
+#define a (y > 5*ch/9)
+#define b (x < 4*cw/9)
+#define c (x > 5*cw/9)
+#define d (y < 4*ch/9)
+
+ /*
+ Each of these defines (except X which is just there for fun), represents
+ the equation of a line. The lines they represent are shown in the diagram
+ below. Checking y against these lines, we are able to choose a region
+ of the window as shown.
+
+ +---------------------A-------|-------|-------B---------------------+
+ | |A B| |
+ | |A | | B| |
+ | | A B | |
+ | | A | | B | |
+ | | A B | |
+ | | A | | B | |
+ | northwest | A north B | northeast |
+ | | A | | B | |
+ | | A B | |
+ C---------------------+----A--+-------+--B----+---------------------D
+ |CCCCCCC | A B | DDDDDDD|
+ | CCCCCCCC | A | | B | DDDDDDDD |
+ | CCCCCCC A B DDDDDDD |
+ - - - - - - - - - - - +CCCCCCC+aaaaaaa+DDDDDDD+ - - - - - - - - - - -
+ | | b c | |
+ | west | b move c | east |
+ | | b c | |
+ - - - - - - - - - - - +EEEEEEE+ddddddd+FFFFFFF+- - - - - - - - - - -
+ | EEEEEEE G H FFFFFFF |
+ | EEEEEEEE | G | | H | FFFFFFFF |
+ |EEEEEEE | G H | FFFFFFF|
+ E---------------------+----G--+-------+--H----+---------------------F
+ | | G H | |
+ | | G | | H | |
+ | southwest | G south H | southeast |
+ | | G | | H | |
+ | | G H | |
+ | | G | | H | |
+ | | G H | |
+ | |G | | H| |
+ | |G H| |
+ +---------------------G-------|-------|-------H---------------------+
+ */
+
+ if (y < A && y >= C)
+ return prop_atoms.net_wm_moveresize_size_topleft;
+ else if (y >= A && y >= B && a)
+ return prop_atoms.net_wm_moveresize_size_top;
+ else if (y < B && y >= D)
+ return prop_atoms.net_wm_moveresize_size_topright;
+ else if (y < C && y >= E && b)
+ return prop_atoms.net_wm_moveresize_size_left;
+ else if (y < D && y >= F && c)
+ return prop_atoms.net_wm_moveresize_size_right;
+ else if (y < E && y >= G)
+ return prop_atoms.net_wm_moveresize_size_bottomleft;
+ else if (y < G && y < H && d)
+ return prop_atoms.net_wm_moveresize_size_bottom;
+ else if (y >= H && y < F)
+ return prop_atoms.net_wm_moveresize_size_bottomright;
+ else
+ return prop_atoms.net_wm_moveresize_move;
+
+#undef X
+#undef A
+#undef B
+#undef C
+#undef D
+#undef E
+#undef F
+#undef G
+#undef H
+#undef a
+#undef b
+#undef c
+#undef d