pure interface of class Grapher

public abstract class Grapher
{
    public abstract void drawLine(int llX,
                                  int llY,
                                  int urX,
                                  int urY);
    public abstract void drawArrow(int llX,
                                   int llY,
                                   int urX,
                                   int urY);
    public abstract void drawRectangle(int llX,
                                       int llY,
                                       int urX,
                                       int urY);
    public abstract void drawText(int x,
                                  int y,
                                  String text);
    public abstract void drawCircle(int x,
                                    int y);
    public abstract void drawDot(int x,
                                 int y);
    public abstract void drawUTurn(int bot,
                                   int left,
                                   int top,
                                   int right);
    public abstract void black();
    public abstract void blue();
    public abstract void purple();
    public abstract void red();
    public abstract void close();
    public void setColour(PremonCat C);
    public Grapher();
}