package planeta;

import java.awt.*;

public class Estado extends Canvas {
//estado
     double x, y, Vx, Vy, t;
//energía y momento angular
     double E, L;
//Double-buffer
     Image imag;
     Graphics gBuffer;
     Dimension dim;

  public Estado() {
     setBackground(Color.cyan);
  }
  void setEstado(double x, double y, double Vx, double Vy, double t){
//dos cifras decimales
     this.x=Math.floor(x*100)/100;
     this.y=Math.floor(y*100)/100;
     this.Vx=Math.floor(Vx*100)/100;
     this.Vy=Math.floor(Vy*100)/100;
     this.t=Math.floor(t*100)/100;
     repaint();
  }
  void setConstantes(double energia, double mAngular){
     E=Math.floor(energia*100)/100;
     L=Math.floor(mAngular*100)/100 ;
  }
  void muestraValores(Graphics g){
     int cAlto=g.getFontMetrics().getHeight();
     int cAncho=g.getFontMetrics().stringWidth("0");
     g.setColor(Color.black);
     g.drawString("Energia", 0, cAlto);
     g.drawString(String.valueOf(E), cAncho, 2*cAlto);
     g.drawString("M. Angular", 0, 3*cAlto);
     g.drawString(String.valueOf(L), cAncho, 4*cAlto);
     g.drawString("Tiempo", 0, 6*cAlto);
     g.drawString(String.valueOf(t), cAncho, 7*cAlto);
     g.drawString("Posición", 0, 9*cAlto);
     g.drawString("X: "+x, cAncho, 10*cAlto);
     g.drawString("Y: "+y, cAncho, 11*cAlto);
     g.drawString("Velocidad", 0, 13*cAlto);
     g.drawString("Vx: "+Vx, cAncho, 14*cAlto);
     g.drawString("Vy: "+Vy, cAncho, 15*cAlto);
  }
  public Dimension getPreferredSize(){
     return new Dimension(80, 300);
  }
  public void update(Graphics g){
     paint(g);
  }
  public void paint(Graphics g){
     Dimension d=getSize();
     if((gBuffer==null)||(d.width!=dim.width)||(d.height!=dim.height)){
          dim=d;
          imag=createImage(d.width, d.height);
          gBuffer=imag.getGraphics();
     }
     gBuffer.setColor(getBackground());
     gBuffer.fillRect(0,0, d.width, d.height);
     muestraValores(gBuffer);
     g.drawImage(imag, 0, 0, null);
 }

}