private void drawCurves(Graphics g) {
        g.setColor(biorhythmGraphColor);
        g.fillRect(0, 35, width, 150);

        int oldX = -3 * gridWidth;
        int oldYPhysical = (int)(amplitude * Math.sin((double)(-3 - 18) * Math.PI / 12.0));
        int oldYSensitivity = (int)(amplitude * Math.sin((double)(-3 - 22) * Math.PI / 12.0));
        int oldYIntellectual = (int)(amplitude * Math.sin((double)(-3 - 2) * Math.PI / 12.0));

        for (int i = -2; i < 27; i++) {
            int x = i * gridWidth;
            int yPhysical = (int)(amplitude * Math.sin((double)(i - 18) * Math.PI / 12.0));
            int ySensitivity = (int)(amplitude * Math.sin((double)(i - 22) * Math.PI / 12.0));
            int yIntellectual = (int)(amplitude * Math.sin((double)(i - 2) * Math.PI / 12.0));

            g.setColor(physicalColor);
            g.drawLine(oldX + PHYSICAL_ORIGIN_X, oldYPhysical + ORIGIN_Y,
                           x + PHYSICAL_ORIGIN_X, yPhysical + ORIGIN_Y);

            g.setColor(sensitivityColor);
            g.drawLine(oldX + SENSITIVITY_ORIGIN_X, oldYSensitivity + ORIGIN_Y,
                           x + SENSITIVITY_ORIGIN_X, ySensitivity + ORIGIN_Y);

            g.setColor(intellectualColor);
            g.drawLine(oldX + INTELLECTUAL_ORIGIN_X, oldYIntellectual + ORIGIN_Y,
                           x + INTELLECTUAL_ORIGIN_X, yIntellectual + ORIGIN_Y);

            oldX = x;
            oldYPhysical = yPhysical;
            oldYSensitivity = ySensitivity;
            oldYIntellectual = yIntellectual;
        }
        g.setColor(borderLineColor);
        g.drawLine(0, ORIGIN_Y, width, ORIGIN_Y);

        g.setColor(biorhythmGraphColor);
        g.fillRect(width, 35, gridWidth * 3, 150);
    }