First we define a few useful objects

public class Vertex2D {
    public float x, y;              // coordinate of vertex
    public int argb;                // color of vertex
    
    public Vertex2D(float xval, float yval, int cval) {
        x = xval;
        y = yval;
        argb = cval;
    }
}

A Drawable interface

import Raster;

public abstract interface Drawable {
    public abstract void Draw(Raster r);
}

I will use integer coefficients in the edge equations for speed. This implementation uses 12 fractional bits, thus, its practical use will be limited to screens with resolutions of 4096 by 4096 or less.