CODEWITHSUNDEEP
c#arraysindexing
blueshift
blueshift

Reputation: 6882

enum array index in c#

I am working with RGB colour data in a C# (WPF) app, and find myself with a lot of cut and pasted code along the lines of

totals.red += currentPixel.red;
totals.green += currentPixel.green;
totals.blue += currentPixel.blue;

I'd like to reduce this copy-pasting and vulnerability to copy-paste errors. I could use arrays of size 3 around the place, but accessing those by number reduces readability.

I'd like to write something like this:

for (col = all colours) {
  totals[col] += currentPixel[col];
}

I'd know how to go about this in C, but am unfamiliar with C#. Something with enums?

Edit: Made the example make more sense.

Upvotes: 0

Views: 615

Answers (3)

itsme86
itsme86

Reputation: 19496

If you really want to use enums for this, you can do it this way:

enum Color { red, green, blue };

{
    foreach (int colorValue in Enum.GetValues(typeof(Color)))
        thing[colorValue] = otherthing[colorValue] * 2;
}

This would also allow you to grab an individual color by name in other code:

var color = thing[Color.red];

Upvotes: 1

fsimonazzi
fsimonazzi

Reputation: 3013

Enums won't help here. But you can define your own type as done in Integer array or struct array - which is better?, and overload the arithmetic operators as described in http://msdn.microsoft.com/en-us/library/8edha89s(v=vs.80).aspx to allow multiplying to an int for example. E.g.

thing = otherthing * 2;

Upvotes: 0

rufu5
rufu5

Reputation: 66

Assuming that red, green and blue are of type Color

You can setup a List of colours

List<Color> colors = new List<Color>();

Add items to it:

colors.Add(green);
colors.Add(blue);
colors.Add(red);

Then itterate:

foreach (Color color in colors)
{
    color.thing = color.otherThing * 2
}

Upvotes: 0

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