Method paint

app/src/processing/app/SerialPlotter.java:65–76

(Graphics2D g, float xstep, double minY, 
                      double maxY, double rangeY, double height)

    }

    public void paint(Graphics2D g, float xstep, double minY, 
                      double maxY, double rangeY, double height) {
      g.setColor(color);
      g.setStroke(new BasicStroke(1.0f));

      for (int i = 0; i < buffer.size() - 1; ++i) {
        g.drawLine(
          (int) (i * xstep), (int) transformY(buffer.get(i), minY, rangeY, height),
          (int) ((i + 1) * xstep), (int) transformY(buffer.get(i + 1), minY, rangeY, height)
        );
      }
    }

    private float transformY(double rawY, double minY, double rangeY, double height) {
      return (float) (5 + (height - 10) * (1.0 - (rawY - minY) / rangeY));