Enums in Processing 1.5.1

in Programming Questions • 1 year ago

I'm trying to create an enum in processing 1.5.1.

enum StarType {
sPOINT,
sCROSS,
sBURST,
sNOVA
};

Unfortunately I get an error: Unrecognized type:46 (ENUM_DEF)

In my search for an answer I've read that older versions of processing don't support enums. Is this still the case?

Replies(7)

thomas.di..

Re: Enums in Processing 1.5.1

1 year ago

i also thought enums are supported in the newer versions, but you can define your enum in another tab (e.g. TAB_NAME.java), then it works as expected

PhiLho

Obviously, yes, alas...
Looks like they have been left on the side when the syntax has been updated to Java 5 syntax. Perhaps because of complexity of the syntax, I don't know.
Actually, they are partially recognized: the ENUM_DEF suggests this, also the fact than enum is highlighted in the PDE, and moreover, the message is actually a warning, it doesn't prevent from running the sketch. Unless you are trying to use the enum, in which case you get an error on unrecognized type... Perhaps they can be added within a .java file, but that's a bit impractical.

Curiously, there is no issue opened on this problem in the project.

bjzaba

Re: Enums in Processing 1.5.1

1 year ago

Thanks for that! Pretty much answers it. Guess I'll have to do a re-think.

monkstone

Re: Enums in Processing 1.5.1

1 year ago

I thought it was considered best practice to place enums in a separate file, as Thomas suggested. So doing so is no major hardship. Certainly I've used them in libraries to good effect. See quarks below for a better example, but see how easily it is done, using the TabManager tool? In my example the enum is Liquid, in a file Liquid.java.

jas0501

Re: Enums in Processing 1.5.1

1 year ago

Here is one approach declare them in a class

Class Whatever

{

final static int sPOINT = 1;

final static int sCROSS = 2;

final static int sBURST = 3;

final static int sNOVA = 4;

Whatever()

{

}

Whatever oneOf;

setup()

{

oneOf = new Whatever();

Draw()

{

switch(something)

{

case Whatever.sBUSRT:

break;

case Whatever.sPOINT:

break:

}

quarks

Re: Enums in Processing 1.5.1

1 year ago

I reworked this example from Oracle's website

Main sketch window code

Planet p;
float earthWeight, mass;
void setup() {
earthWeight = 100.0;
p = Planet.JUPITER;
mass = (float) p.surfaceGravity() * (earthWeight / Planet.EARTH.surfaceGravity());
println("Your weight on Mars is " + mass);
}

Second tab called (note the tab is named after the enum name with a .java extension)
Planet.java

public enum Planet {
MERCURY (3.303e+23f, 2.4397e6f),
VENUS (4.869e+24f, 6.0518e6f),
EARTH (5.976e+24f, 6.37814e6f),
MARS (6.421e+23f, 3.3972e6f),
JUPITER (1.9e+27f, 7.1492e7f),
SATURN (5.688e+26f, 6.0268e7f),
URANUS (8.686e+25f, 2.5559e7f),
NEPTUNE (1.024e+26f, 2.4746e7f);
private final float mass; // in kilograms
private final float radius; // in meters
Planet(float mass, float radius) {
this.mass = mass;
this.radius = radius;
}
private float mass() {
return mass;
}
private float radius() {
return radius;
}
// universal gravitational constant (m3 kg-1 s-2)
public static final float G = 6.67300E-11f;
float surfaceGravity() {
return G * mass / (radius * radius);
}
float surfaceWeight(float otherMass) {
return otherMass * surfaceGravity();
}
}

PhiLho

Re: Enums in Processing 1.5.1

1 year ago

jas0501, your example doesn't show enums, it shows how they were implemented 10 years ago... enums are type-safe, self-descriptive, enumerable, etc. Much better.

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