From 983fae140a1e162d947eab8b8a0d9acba291d3a8 Mon Sep 17 00:00:00 2001 From: rodri Date: Sat, 28 Jan 2023 22:16:25 +0000 Subject: initial public release. --- triangle.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 triangle.c (limited to 'triangle.c') diff --git a/triangle.c b/triangle.c new file mode 100644 index 0000000..5301956 --- /dev/null +++ b/triangle.c @@ -0,0 +1,58 @@ +#include +#include +#include +#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; +} -- cgit v1.2.3