class GUI { PApplet parent; ControlP5 cp5; int abc = 100; Slider s0, s1, s2, s3, s4, s5, s6, s7, s8, s9; Toggle t0; public GUI () { } public void run(PApplet _parent) { this.parent = _parent; this.cp5 = new ControlP5(this.parent); this.cp5.setFont(createFont("Arial", 10)); this.s0 = cp5.addSlider("PathRad").plugTo(parent).setRange(0, 100).setPosition(10, 10).setValue(30.0).setDecimalPrecision(2).setSize(50, 10).setHandleSize(10).setColorForeground(color(255, 40)).setColorBackground(color(255, 40)); this.s4 = cp5.addSlider("InitSpeed").plugTo(parent).setRange(0.00, 10.00).setPosition(10, 22).setValue(2.0).setDecimalPrecision(3).setSize(50, 10).setHandleSize(10).setColorForeground(color(255, 40)).setColorBackground(color(255, 40)); this.s5 = cp5.addSlider("MaxSpeed").plugTo(parent).setRange(0.00, 10.00).setPosition(10, 34).setValue(4.0).setDecimalPrecision(3).setSize(50, 10).setHandleSize(10).setColorForeground(color(255, 40)).setColorBackground(color(255, 40)); this.s6 = cp5.addSlider("MaxForce").plugTo(parent).setRange(0.00, 2.00).setPosition(10, 46).setValue(0.10).setDecimalPrecision(3).setSize(50, 10).setHandleSize(10).setColorForeground(color(255, 40)).setColorBackground(color(255, 40)); this.s7 = cp5.addSlider("AgentCount").plugTo(parent).setRange(0.00, 500.00).setPosition(10, 58).setValue(250).setDecimalPrecision(3).setSize(50, 10).setHandleSize(10).setColorForeground(color(255, 40)).setColorBackground(color(255, 40)); this.s9 = cp5.addSlider("Amplitude").plugTo(parent).plugTo(parent).setRange(0.00, 100.00).setPosition(10, 70).setValue(25).setDecimalPrecision(3).setSize(50, 10).setHandleSize(10).setColorForeground(color(255, 40)).setColorBackground(color(255, 40)) ; } public void draw() { background(0); } } Update