Logarithmic slider?

Unity Engine
1

Any thoughts about adding the possibility to make a slider logarithmic? This would be very useful for many cases. If i want to do it myself i guess i have to make a completely new Slider component?

2

I was looking for the same thing.

It’s been a while, but maybe this will help: I just thought to take the value in as a linear value, and then apply the exponential/logarithm in the script itself

maybe you can somehow override the readout to say the post-modified value as well, but the “actual” value of the slider is the linear one, still

3

I know this is an ancient thread, but Unity’s already implemented a power/log slider; and regular sliders are simply power sliders with a power of 1.0f. However, the dang method is internal :-/

Try this

#if UNITY_EDITOR
[CustomPropertyDrawer(typeof(LogarithmicRangeAttribute))]
public class LogarithmicRangeDrawer : PropertyDrawer {
  public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
    LogarithmicRangeAttribute attribute = (LogarithmicRangeAttribute) this.attribute;
    if (property.propertyType != SerializedPropertyType.Float) {
      EditorGUI.LabelField(position, label.text, "Use LogarithmicRange with float.");
      return;
    }

    Slider(position, property, attribute.min, attribute.max, attribute.power, label);
  }

  public static void Slider(
      Rect position, SerializedProperty property,
      float leftValue, float rightValue, float power, GUIContent label) {
    label = EditorGUI.BeginProperty(position, label, property);
    EditorGUI.BeginChangeCheck();
    float num = PowerSlider(position, label, property.floatValue, leftValue, rightValue, power);

    if (EditorGUI.EndChangeCheck())
      property.floatValue = num;
    EditorGUI.EndProperty();
  }

  public static float PowerSlider(Rect position, GUIContent label, float value, float leftValue, float rightValue, float power) {
    var editorGuiType = typeof(EditorGUI);
    var methodInfo = editorGuiType.GetMethod(
        "PowerSlider",
        System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static,
        null,
        new[] {typeof(Rect), typeof(GUIContent), typeof(float), typeof(float), typeof(float), typeof(float)},
        null);
    if (methodInfo != null) {
      return (float)methodInfo.Invoke(null, new object[]{position, label, value, leftValue, rightValue, power});
    }
    return leftValue;
  }
}
#endif


[AttributeUsage(AttributeTargets.Field)]
public class LogarithmicRangeAttribute : PropertyAttribute {
  public readonly float min = 1e-3f;
  public readonly float max = 1e3f;
  public readonly float power = 2;
  public LogarithmicRangeAttribute(float min, float max, float power) {
    if (min <= 0) {
      min = 1e-4f;
    }
    this.min = min;
    this.max = max;
    this.power = power;
  }
}
1 Like
4

Was doing some audio related editor stuff and cooked one up myself. This one allows for a custom min, max and a value for the center.

1 Like