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Openhtmltopdf is a CSS 2.1 renderer written in Java. This artifact supports PDF output with Apache PDF-BOX 2.
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package com.openhtmltopdf.pdfboxout.quads;
import java.awt.geom.Point2D;
/**
*
* @author Sunshine A class to represent a triangle Note that all three points
* should be different in order to work properly
*
* Source: https://www.sunshine2k.de/coding/java/Polygon/Kong/Kong.html
*/
public class Triangle {
// coordinates
public final Point2D.Float a;
public final Point2D.Float b;
public final Point2D.Float c;
Triangle(Point2D.Float a, Point2D.Float b, Point2D.Float c) {
this.a = a;
this.b = b;
this.c = c;
}
public static boolean isInside(Point2D.Float x, Point2D.Float y, Point2D.Float z, Point2D.Float p) {
Point2D.Float v1 = new Point2D.Float(y.x - x.x, y.y - x.y);
Point2D.Float v2 = new Point2D.Float(z.x - x.x, z.y - x.y);
double det = v1.x * v2.y - v2.x * v1.y;
Point2D.Float tmp = new Point2D.Float(p.x - x.x, p.y - x.y);
double lambda = (tmp.x * v2.y - v2.x * tmp.y) / det;
double mue = (v1.x * tmp.y - tmp.x * v1.y) / det;
return (lambda > 0 && mue > 0 && (lambda + mue) < 1);
}
}