DrawHalfEdge.pde

public class DrawHalfEdge {
  
  public void drawline(Point v1, Point v2) {
    //////System.out.println(v1 + " " + v2);
    line(v1.getX(), v1.getY(), v2.getX(), v2.getY());
  }
  public void drawpoint(Point v) {
    ellipse(v.getX(), v.getY(),10,10);
  }
  
  public void drawGraph(ArrayList<Point> vlist) {
    for(Point p: vlist) {
      drawConnectedGraph(p);
    }
    //zoom(vlist);
  }
  
  public void drawConnectedGraph(Point p) {
    ArrayList<HalfEdge> edges = p.getLeaving();
    drawpoint(p);
    //////System.out.println(p);
    if(edges != null) {
      for(HalfEdge edge: edges) {
        //////System.out.println(edge);
        drawConnection(edge);
      }
    }
  }
    
  public void drawConnection(HalfEdge edge) {
    //////System.out.println("drawing connection");
    Point v2 = edge.getOrigin();
    Point v1 = edge.gettwin().getOrigin();
    drawline(v1, v2);
  }
  public void zoom(ArrayList<Point> vlist) {
    float[] bounds = getbounds(vlist);
    float[] range = getRange(bounds);    //{maxx,minx,maxy,miny};
    float scalefactor = scalingfactor(range);
    translate(range[0]/2, range[1]/2);    // center the figure
    scale(scalefactor);
  }
  public float scalingfactor(float[] range) {
      float rangex = range[0];
      float rangey = range[1];
      float diffx = width/rangex;
      float diffy = height/rangey;
      return Math.min(diffx,diffy);
  }
  public float[] getRange(float[] bounds) {
    float rangex = bounds[0] - bounds[1];
    float rangey = bounds[2] - bounds[3];
    float[] range = {rangex, rangey};
    return range;
  }
  public float[] getbounds(ArrayList<Point> vlist) {
    float maxx = Float.NEGATIVE_INFINITY;
    float maxy = Float.NEGATIVE_INFINITY;
    float minx = Float.POSITIVE_INFINITY;
    float miny = Float.POSITIVE_INFINITY;
    for(Point v: vlist) {
      float x = v.getX();
      float y = v.getY();
      if(x < minx) {
        minx = x;
      }
      if(x > maxx) {
        maxx= x;
      }
      if(y < miny) {
        miny = y;
      }
      if(y > maxy) {
        maxy = y;
      }
    }
    float[] result = {maxx,minx,maxy,miny};
    return result;
  }
}

//find lowest and highest x and y, divide by difference.