Rounding Inaccuracies When Combining Areas in Java?

Question

I\'m working with Areas in Java.

My test program draws three random triangles and combines them to form one or more polygons. After the Areas

Answer 1

Here:

    for (int i = 0; i < 3; i++) {
        triangle.moveTo(random.nextInt(400) + 50, random.nextInt(400) + 50);
        triangle.lineTo(random.nextInt(400) + 50, random.nextInt(400) + 50);
        triangle.lineTo(random.nextInt(400) + 50, random.nextInt(400) + 50);
        triangle.closePath();
        area.add(new Area(triangle));
    }       

you are adding in fact 1 triangle in the first loop 2 triangles in the second loop 3 triangles in the third loop

This is where your inaccuracies come from. Try this and see if your problem still persists.

    for (int i = 0; i < 3; i++) {
        triangle.moveTo(random.nextInt(400) + 50, random.nextInt(400) + 50);
        triangle.lineTo(random.nextInt(400) + 50, random.nextInt(400) + 50);
        triangle.lineTo(random.nextInt(400) + 50, random.nextInt(400) + 50);
        triangle.closePath();
        area.add(new Area(triangle));
        triangle.reset();
    }    

Note the path reset after each loop.

EDIT: to explain more where the inaccuracies come from here the three paths you try to combine. Which makes it obvious where errors might arise.