Realtime graf pomoci Jpanelu – Java – Fórum – Programujte.com

Zdravim, potrebovala bych pomoct s aplikaci osciloskop. Vycitam data ze seriove linky a ty vykresluji pomoci graphic2D do Jpanelu. Zatim to delam tak ze do promene nacitam data a ty vzdy, kdyz mam vice jak 100 bodu vykreslim. Jenze vzdy prekresluji cely panel, neexistuje funkce ktera by jen dovykreslila novy bod a posunula okno tak, ze druhe strany by se ten bod zase smazal? Aby se mi nemenilo meritko a nemusela bych porad prekreslovat cely Jpanel, potrebuju aby to fungovalo reatime tak 50x za sekundu.

protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        int w = getWidth();
        int h = getHeight();

        //System.out.println(w + "x" + h);
        double xScale = (w - 2 * PAD) / (xMax - xMin);
        double yScale = (h - 2 * PAD) / (yMax - yMin);
        if (firstTime) {
            System.out.printf("xScale = %.1f  yScale = %.1f%n",
                    xScale, yScale);
        }
        Point2D.Double origin = new Point2D.Double(); // Axes origin.
        Point2D.Double offset = new Point2D.Double(); // Locate data.

        origin.x = PAD;
        offset.x = w;
        origin.y = h - PAD;
        offset.y = origin.y;

         // Draw abcissa.
        g2.draw(new Line2D.Double(PAD, origin.y, w - PAD, origin.y));
        // Draw ordinate.
        g2.draw(new Line2D.Double(origin.x, PAD, origin.x, h - PAD));
        g2.setPaint(Color.red);
        // Mark origin.
        g2.fill(new Ellipse2D.Double(origin.x - 2, origin.y - 2, 4, 4));

        g2.setPaint(Color.green.darker());

        double x1, x2, y1, y2;

        for (int i = 0; i < x.length - 2; i++) {
            x1 = offset.x - xScale * x[i];
            y1 = offset.y - yScale * y[i];
           
                x2 = offset.x - xScale * x[i + 1];
                y2 = offset.y - yScale * y[i + 1];
           
              
            g2.setPaint(Color.green.darker());
            g2.draw(new Line2D.Double(x1, y1, x2, y2));