how can i get each triangle?

IncrementalTin tin = new IncrementalTin(1.0);
List<Vertex> vertexList = loadPointSet(newlineList);
tin.add(vertexList, null);
			
TinRenderingUtility.drawTin(tin, 500, 500, new File("tin.png"));

I need the three coordinates of each triangle，not a picture，what should i do？

[gwlucastrig]

First off, thank you for your interest in the Tinfour project. Looking at the code example in your post, it looks like you’ve already made good progress in using the Tinfour software.

There are a couple of ways to do what you want. A good place to start would be to use the TriangleCollector. The implementation is efficient and relatively easy to use. Some code follows. For my example, I’ve used randomly generated vertices rather than your loadPointSet() method, but the idea is the same.

package org.tinfour.example.collector;

import java.util.List;
import java.util.function.Consumer;
import org.tinfour.common.IQuadEdge;
import org.tinfour.common.SimpleTriangle;
import org.tinfour.common.Vertex;
import org.tinfour.demo.utils.TestVertices;
import org.tinfour.standard.IncrementalTin;
import org.tinfour.utils.TriangleCollector;
 
public class ExampleTriangleCollector {

	static class ExampleCollector implements Consumer<SimpleTriangle> {
		@Override
		public void accept(SimpleTriangle t) {
			// here we 
			IQuadEdge a = t.getEdgeA();
			IQuadEdge b = t.getEdgeB();
			IQuadEdge c = t.getEdgeC();
			// it is a little confusing here...  we get the first point
			// from each edge.  So for each edge, we call getA().
			// In a future version,  SimpleTriangle will be
			// enhanced with methods named getVertexA(), getVertexB(),
			// and getVertexC() to do this operation in a less confusing manner.    
			Vertex A = a.getA();
			Vertex B = b.getA();
			Vertex C = c.getA();
			System.out.println("Triangle ");
			System.out.println("  A= " + A.toString());
			System.out.println("  B= " + B.toString());
			System.out.println("  C= " + C.toString());   
		}
	}

	public static void main(String[] args) {
		IncrementalTin tin = new IncrementalTin(1.0);
		List<Vertex> vertexList = TestVertices.makeRandomVertices(5, 0);
		tin.add(vertexList, null);
		ExampleCollector collector = new ExampleCollector();
		TriangleCollector.visitSimpleTriangles(tin, collector);
	}
}

[gwlucastrig]

There is now an iterator for SimpleTriangles in the API

IncrementalTin tin;   //  constructed and populated
int nTriangle = 0;
for(SimpleTriangle triangle:   tin.triangles()){
     nTriangle++;
}