/*
so, we have a line.
from 0,0 to 10,0
and we want it to transform into a rectangle at about...
-1,-1 1,-1 1,11 -1,11
I guess we're taking each point and pushing it away from itself.
so 0,0... we can make into a square. we need to push in a direction based on the direction of the other half of the line
so a=points_to_angle(p1,p2)
which is 90deg in this case from 0,0 to 10,0
and we need to push 0,0 in two directions to create two new points
at angles...
90+135 and 90+135+90
a+135 and a+135+90
now to pick an emboldeness amount. sqrt(2) will get us to the original points I guessed at earlier.
#define embolden(p1,p2,angle,dist)
if(s.len == 2) {
a1=points_to_angle(p1,p2);
a2=points_to_angle(p2,p1);
d=1;//how far to embolden
//a2 = (a1 + 180) % 360
s[0]=c3_add(s.p[0],(c3_t){sin(a2+45)*d,cos(a2+45)*d,0})
s[1]=c3_add(s.p[0],(c3_t){sin(a2-45)*d,cos(a2-45)*d,0})
s[2]=c3_add(s.p[1],(c3_t){sin(a1+45)*d,cos(a1+45)*d,0})
s[3]=c3_add(s.p[1],(c3_t){sin(a1-45)*d,cos(a1-45)*d,0})
}
//this can be a script. it'll turn lines into rectangles.
//could be done with awk probably.
//base it on offsetshape?
//maybe just do it in python.
