[GML] mouse_within (readable)

///mouse_within(x,y,x2,y2)
// Returns true if the mouse is within the specified field
// Written by GlitchDetector

var mx,my;

mx = mouse_x
my = mouse_y

var x1,x2,y1,y2;

x1 = argument0
x2 = argument2
y1 = argument1
y2 = argument3

var xin,yin;

xin = (mx >= x1) && (mx <= x2)
yin = (my >= y1) && (my <= y2)

var is_inside;

is_inside = (xin && yin)

return is_inside;