Giorno: 10 Febbraio 2014

package assicartesiani;

import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JComponent;

public class JOxy extends JComponent {

    private int scalaX, scalaY, traslX, traslY;
    private String asseX, asseY;

    public JOxy() {
        setPreferredSize(new Dimension(400, 400));
        setScalaX(50);
        setScalaY(50);
        setTraslX(40);
        setTraslY(40);
        setAsseX("X");
        setAsseY("Y");
    }

    public int xg(double x) {
        return (int) Math.round(getTraslX() + x * getScalaX());
    }

    public int yg(double y) {
        return (int) Math.round(getHeight() - 1 - getTraslY() - y * getScalaY());
    }

    public double xr(int x) {
        return (double) (x - getTraslX()) / getScalaX();
    }

    public double yr(int y) {
        return (double) (getHeight() - 1 - getTraslY() - y) / getScalaY();
    }

    @Override
    public void paintComponent(Graphics g) {
        int w = getWidth() - 1;
        int h = getHeight() - 1;
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setFont(getFont());
        FontMetrics fm = g2.getFontMetrics();

        g2.setColor(getBackground());
        g2.fillRect(0, 0, w, h);
        g2.setColor(getForeground());

        // asse x
        g2.drawLine(0, yg(0), w, yg(0));
        g2.drawLine(w - 20, yg(0) - 10, w, yg(0));
        g2.drawLine(w - 20, yg(0) + 10, w, yg(0));
        for (int x = -getTraslX() / getScalaX(); x < (w - getTraslX()) / getScalaX(); x++) {
            g2.drawLine(xg(x), yg(0) - 5, xg(x), yg(0) + 5);
            String xs = x + "";
            g2.drawString(xs, xg(x) - fm.stringWidth(xs) / 2, yg(0) + 5 + fm.getHeight());
        }
        g2.drawString(getAsseX(), w - 5 - fm.stringWidth(getAsseX()), yg(0) - 15 - fm.getDescent());

        // asse y
        g2.drawLine(xg(0), h, xg(0), 0);
        g2.drawLine(xg(0) - 10, 20, xg(0), 0);
        g2.drawLine(xg(0) + 10, 20, xg(0), 0);
        for (int y = -getTraslY() / getScalaY(); y < (h - getTraslY()) / getScalaY(); y++) {             g2.drawLine(xg(0) - 5, yg(y), xg(0) + 5, yg(y));             String ys = y + "";             g2.drawString(ys, xg(0) - 10 - fm.stringWidth(ys), yg(y) + fm.getAscent() / 2);         }         g2.drawString(getAsseY(), xg(0) + 15, fm.getHeight());     }     public int getScalaX() {         return scalaX;     }     public final void setScalaX(int scalaX) {         if (scalaX >= 20) {
            this.scalaX = scalaX;
            repaint();
        }
    }

    public int getScalaY() {
        return scalaY;
    }

    public final void setScalaY(int scalaY) {
        if (scalaY >= 20) {
            this.scalaY = scalaY;
            repaint();
        }
    }

    public int getTraslX() {
        return traslX;
    }

    public final void setTraslX(int traslX) {
        if (traslX >= 0) {
            this.traslX = traslX;
            repaint();
        }
    }

    public int getTraslY() {
        return traslY;
    }

    public final void setTraslY(int traslY) {
        if (traslY >= 0) {
            this.traslY = traslY;
            repaint();
        }
    }

    public String getAsseX() {
        return asseX;
    }

    public final void setAsseX(String asseX) {
        if (asseX != null) {
            this.asseX = asseX;
        } else {
            this.asseX = "";
        }
    }

    public String getAsseY() {
        return asseY;
    }

    public final void setAsseY(String asseY) {
        if (asseY != null) {
            this.asseY = asseY;
        } else {
            this.asseY = "";
        }
    }

}