package concurrency.display;

import java.awt.*;

class NumberCanvas extends Canvas {
	  int value_ = 0;
  String title_ = null;

  public NumberCanvas (String title) {
    this(title,Color.cyan); // re-uses the next constructor!
  }

  public NumberCanvas (String title, Color c) {
    super();
    title_=title;
    setBackground(c);
  }

  // The repaint method calls the method paint that updates the GUI.
  // We will explain the paint method later.
  public void setvalue(int newval) {
    value_ = newval;
    repaint();

  }

  Font f1 = new Font("Helvetica",Font.BOLD,36);
  Font f2 = new Font("Times",Font.ITALIC+Font.BOLD,24);

  public void setcolor(Color c) {
    setBackground(c);
    repaint();
  }

    public void paint(Graphics g){

    g.setColor(Color.black);

    // Display the title
    g.setFont(f2);
    FontMetrics fm = g.getFontMetrics();
    int w = fm.stringWidth(title_);
    int h = fm.getHeight();
    int x = (getSize().width - w)/2;
    int y = h;
    g.drawString(title_, x, y);
    g.drawLine(x,y+3,x+w,y+3);

    // Display the value
    g.setFont(f1);
    fm = g.getFontMetrics();
    String s1 = String.valueOf(value_);
    w = fm.stringWidth(s1);
    h = fm.getHeight();
    x = (getSize().width - w)/2;
    y = (getSize().height+ h)/2;
    g.drawString(s1, x, y);
  }
}