How to use

line

method

in

processing.core.PApplet

public void line(float x1, float y1, float z1,
  float x2, float y2, float z2) {
 intf.app.line(x1, y1, z1, x2, y2, z2);
}

public void line(float x1, float y1, float x2, float y2) {
 intf.app.line(x1, y1, x2, y2);
}

@Override
void drawGui() {
  if (backgroundVisible) {
    applet.stroke(sliderBack);
    applet.line(pX, pY + pH / 2, pX + pW, pY + pH / 2);
  }
  applet.noStroke();
  applet.fill(255);
  applet.ellipse(pX + pScaled, pY + pH / 2, 10, 10);
}