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#include <u.h>
#include <libc.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
Triangle
Trian(int x0, int y0, int x1, int y1, int x2, int y2)
{
return (Triangle){Pt(x0, y0), Pt(x1, y1), Pt(x2, y2)};
}
Triangle
Trianpt(Point p0, Point p1, Point p2)
{
return (Triangle){p0, p1, p2};
};
Point
centroid(Triangle t)
{
return divpt(addpt(t.p0, addpt(t.p1, t.p2)), 3);
}
void
triangle(Image *dst, Triangle t, int thick, Image *src, Point sp)
{
Point pl[4];
pl[0] = t.p0;
pl[1] = t.p1;
pl[2] = t.p2;
pl[3] = pl[0];
poly(dst, pl, nelem(pl), 0, 0, thick, src, sp);
}
void
filltriangle(Image *dst, Triangle t, Image *src, Point sp)
{
Point pl[4];
pl[0] = t.p0;
pl[1] = t.p1;
pl[2] = t.p2;
pl[3] = pl[0];
fillpoly(dst, pl, nelem(pl), 0, src, sp);
}
Triangle
rotatriangle(Triangle t, double θ, Point c)
{
t.p0 = rotatept(t.p0, θ, c);
t.p1 = rotatept(t.p1, θ, c);
t.p2 = rotatept(t.p2, θ, c);
return t;
}
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