Simple class to create a set of controlP5.Slider controllers from a POJO with setValueName(<Numeric Type>) methods. Optional Range annotation and getting of default value.

ParameterView.java

// I ran into a weird unknown method invocation with cp5magic (perhaps because I have to use Processing 1.5.1 because of bugs in 2.0b).
// That combined with having classes with setParamName1(numeric) style setters, I wrote this.  Enjoy.

/* 
Usage:
	public class MyParameterClass {
		double myParameter = 100d;
		@Range(max=200)
		public void setMyParameter(double v) { myParameter = v; }
		public double getMyParameter() { return myParameter; }

		// Any number of other params, same structure…
		// Only the setter method is required
	}

MyParameterClass myParams = new MyParameterClass();
ParameterView pv = new ParameterView(cp5);
pv.createControllers(myParams);

*/

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.InvalidParameterException;

import controlP5.ControlEvent;
import controlP5.ControlListener;
import controlP5.ControlP5;
import controlP5.ControlWindow;
import controlP5.ControllerGroup;
import controlP5.Slider;
import controlP5.Tab;

public class ParameterView {
	@Retention(RetentionPolicy.RUNTIME)
	public @interface Range {
		float min() default 0f;
		float max();
	}
	
	private ControlP5 cp5;
	private int width;
	private int controlY = 0;
	private ControlWindow window;

	public ParameterView(final ControlP5 cp5) {
		this.cp5 = cp5;
		this.width = 400;
		window = cp5.controlWindow;
//		cp5.addControlWindow("Parameter Window", 100, 100, 400, 600)
//				.hideCoordinates().setBackground(0);
		cp5.addBang("Save Properties").addListener(new ControlListener() {
			@Override
			public void controlEvent(ControlEvent theEvent) {
				cp5.saveProperties();
			}
		});
	}

	public void createControllers(final Object pojo) {
		Tab tab = cp5.addTab(window, pojo.getClass().getSimpleName());
		ControllerGroup<?> group = cp5.begin(window);
		controlY = 0;
		for (final Method setter : pojo.getClass().getMethods()) {
			if (setter.getName().startsWith("set")) {
				@SuppressWarnings("rawtypes")
				final Class parameterClass = getNumericParameter(setter);
				if (parameterClass != null) {
					float min = 0;
					float max = 100;
					float defalt = 50;

					try {
						Method getter = pojo.getClass().getMethod(
								setter.getName().replace("set", "get"));
						Object val = getter.invoke(pojo);
						if (val instanceof Number) {
							defalt = ((Number) val).floatValue();
							// Make sure range includes default...
							max = Math.max(max, defalt);
							min = Math.min(min, defalt);
						}
					} catch (SecurityException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					} catch (NoSuchMethodException e1) {
						// Possible...
					} catch (IllegalArgumentException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (IllegalAccessException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (InvocationTargetException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					
					Range a = setter.getAnnotation(Range.class);
					if (a!=null) {
						min = a.min();
						max = a.max();
						// Ensure that defalt is within min<=defalt<=max
						defalt = Math.min(defalt, max);
						defalt = Math.max(min, defalt);
					}

					String label = setter.getName().replace("set", "");
					Slider slider = cp5.addSlider(label)
							.setLabelVisible(true)
							.setPosition(0, controlY += 20)
							.setSize(width / 2, 20)
							.setRange(min, max)
							.setValue(defalt)
							.setGroup(group)
							.setTab(tab.getName());
					slider.addListener(new ControlListener() {
						@Override
						public void controlEvent(ControlEvent theEvent) {
							try {
								if (parameterClass == Integer.class
										|| parameterClass == Integer.TYPE) {
									int val = (int) theEvent.getValue();
									setter.invoke(pojo, val);
								} 
								else if (parameterClass == Double.class
										|| parameterClass == Double.TYPE) {
									double val = theEvent.getValue();
									setter.invoke(pojo, val);
								} 
								else if (parameterClass == Float.class
										|| parameterClass == Float.TYPE) {
									float val = theEvent.getValue();
									setter.invoke(pojo, val);
								} 
								else {
									throw new InvalidParameterException(
											"Cannot handle parameter type "
													+ parameterClass);
								}
							} catch (IllegalArgumentException e) {
								// TODO Auto-generated catch block
								e.printStackTrace();
							} catch (IllegalAccessException e) {
								// TODO Auto-generated catch block
								e.printStackTrace();
							} catch (InvocationTargetException e) {
								// TODO Auto-generated catch block
								e.printStackTrace();
							}
						}
					});
				}
			}
		}
		cp5.end();
	}

	@SuppressWarnings("rawtypes")
	private Class getNumericParameter(Method m) {
		if (m.getParameterTypes().length != 1) {
			return null;
		}
//		@SuppressWarnings("rawtypes")
		Class pc = m.getParameterTypes()[0];
		if (pc.getSuperclass() == Number.class) {
			return pc;
		}
		if (pc == Double.TYPE || pc == Float.TYPE || pc == Integer.TYPE
				|| pc == Long.TYPE) {
			return pc;
		}
		return null;
	}
}