import java.awt.*;
 
 public class GraphPanel extends Panel {
 
 private boolean debug = false;   // debuggin mode
 
 private Graph lab_graph;
 private ControlArrow up, down, left, right;
 private Image itablo;   // double buffering for display
 private Graphics gtablo;
 private FontMetrics fm;
 private Font tablo_font;
 private Font state_font;
 private Substance substance;
 private State current_state;
 private Rectangle bounds, graph, buttons, tablo, state;
 private TextField state_field;
 private boolean loaded;                    

 
 public GraphPanel(Substance _substance) {
    substance = _substance;
    lab_graph = new Graph(substance);
    setLayout(null);
    loaded = false;     
    tablo_font = new Font("Courier",Font.BOLD, 12);
    state_font = new Font("TimesRoman", Font.PLAIN, 10);
    state_field = new TextField();
    state_field.setEditable(false);
 }
 
 public void setSubstance(Substance sub) {
    substance = sub;
    lab_graph.setSubstance(sub);
    repaint();
 }

 public void reset()  { lab_graph.reset(); repaint();  }
 public void reveal() { lab_graph.reveal(); repaint(); }
 public void clear()  { lab_graph.clear();             }
 public void setSaveMode(boolean mode)   { lab_graph.setSaveMode(mode); }
//-----------------------------------------------------------

public boolean mouseDown(Event evt, int x, int y) {
        if(up.inside(x,y)) lab_graph.moveUp();      
   else if(down.inside(x,y)) lab_graph.moveDown();
   else if(left.inside(x,y)) lab_graph.moveLeft();
   else if(right.inside(x,y)) lab_graph.moveRight();
   else return super.mouseDown(evt, x, y);
   repaint();
   return true;
}

public boolean keyDown(Event evt, int key) {
   repaint();
   return super.keyDown(evt, key);
}   

public boolean mouseEnter(Event evt, int x, int y) {
   if(evt.target == lab_graph) {
      lab_graph.requestFocus();
   }
   else return super.mouseEnter(evt,x,y);
   return true;
}  
   
//------------------------------------------------------------- 
 public void paint(Graphics g) {
    if(!loaded) { initComponents(); loaded = true; }
    drawBG(g);
    drawUpArrow(g);
    drawDownArrow(g);
    drawLeftArrow(g);
    drawRightArrow(g);

    update(g);
 }
 
 public void update(Graphics g) {
    drawTablo(g);
    drawState(g);
 }
 

 //------------------------------------
 private void drawBG(Graphics g) {
   g.setColor(Color.black);
   g.fill3DRect(bounds.x,bounds.y,bounds.width,bounds.height,true); 
 }

 private void drawUpArrow(Graphics g) {
   up.draw(g);
 }

 private void drawDownArrow(Graphics g) {
   down.draw(g);
 }
 
 private void drawLeftArrow(Graphics g) {
   left.draw(g);
 }     

 private void drawRightArrow(Graphics g) {
   right.draw(g);
 }
   
 public void drawTablo(Graphics g) {
   if(gtablo==null) {
      itablo = createImage(tablo.width, tablo.height);
      gtablo = itablo.getGraphics();
   }
   String t = "Temperature: " + lab_graph.getTemperature() + " (C)";
   String p = "Pressure   : " + lab_graph.getPressure() + " (kbars)";

   gtablo.setColor(Color.black);
   gtablo.fillRect(0,0,tablo.width,tablo.height);

   gtablo.setFont(tablo_font);
   int x = 5;
   int y1 = tablo.height/2-5;
   int y2 = tablo.height/2+10;
   
   gtablo.setColor(Color.green);
   gtablo.drawString(t, x, y1);
   gtablo.drawString(p, x, y2);

   g.drawImage(itablo, tablo.x, tablo.y, this);
 }

public void drawState(Graphics g) {
   if(current_state == lab_graph.getState()) return;
   state_field.setText(lab_graph.getState().getName());
   current_state = lab_graph.getState();
}

 //----------------------------------------
 private void initComponents() {
    initBounds();
    initGraph();
    initButtons();
    initTablo();
    initState();
 }
 
 private void initBounds() {
    bounds = new Rectangle(0, 0, size().width, size().height);
 }
 
 private void initGraph() {
    graph = new Rectangle(bounds.x, bounds.y, bounds.width, bounds.height-50);
    add(lab_graph);
    lab_graph.reshape(graph.x, graph.y, graph.width, graph.height);
 }
 
 private void initButtons() {
    int offtop = 5; int offbottom = 5; int offleft = 5;
    int x = bounds.x + offleft;
    int y = graph.y + graph.height + offtop;
    int height = bounds.height - graph.height - offbottom - offtop;
    int width = 4*height;
    buttons = new Rectangle(x, y, width, height);
    
    up = new ControlArrow(ControlArrow.UP, buttons.x, buttons.y, buttons.width/4, buttons.height);
    down = new ControlArrow(ControlArrow.DOWN, up.x+up.width,buttons.y,buttons.width/4,buttons.height);
    left = new ControlArrow(ControlArrow.LEFT, down.x+down.width,buttons.y,buttons.width/4,buttons.height);
    right = new ControlArrow(ControlArrow.RIGHT, left.x+left.width,buttons.y,buttons.width/4,buttons.height);
}    
 
private void initTablo() {
   int x = buttons.x + buttons.width    + 10;
   int y = buttons.y;
   int w = 180;
   int h = buttons.height;
   tablo = new Rectangle(x, y, w, h);
} 
 
private void initState() {
   int x = tablo.x + tablo.width + 10;
   int y = tablo.y;
   int w = (bounds.x+bounds.width) - (tablo.x+tablo.width) - 2*10;
   int h = tablo.height;
   state = new Rectangle(x, y, w, h);
   int off = 5;
   state_field.reshape(x, y+off, w, h-2*off);
   add(state_field);
}

private void dbi(String s) {
   if(debug) System.out.println(s);
}   
}