Clever Geek Handbook

A faster way to make "if" statements

Is there a faster way to do this? I have 36 different images, when the image changes, I have a line that tracks the image (rotation), image1 - rot = 1, etc., what I need to do is use 36 assertions like this:

if (rotation == 1) //This is picture1
{

}
else if (rotation == 2) //This is picture2
{

}

up to:

else if (rotation == 36) //This is picture36
{

}

Is there a way to figure out what rotation is, with only 1 or 2 lines of code? And anyone who says a check before asking I checked and I didn't find anything to help, if you find anything post it here.

The internals of my if statements are only for changing the image.

Thank.

+3


source to share


6 answers


Or use an array

picture = img[i];


or may actually call the image after the index (e.g. image01.jpg

, image02.jpg

etc.)

Array strikes me as the most extensible and concise solution.

+6


source


For example, say inside yours if you are typing your rotation.

if (rotation == 1) //This is picture1
{
   System.out.println(1);
}
else if (rotation == 2) //This is picture2
{
    System.out.println(2);
}


else if(rotation==36)
{
    System.out.println(36);
}


You can change all the code to one line.

System.out.println(rotation);
+2


source


You can use an array WhateverYourPictureClassIs

or operator IDictionary<int,WhateverYourPictureClassIs>

or switch

.

For example, if the image information is a string:

string[] pictures = {
  "you might have a blank entry here if the first number is 1 instead of 0",
  "picture1",
  "picture2",
  "picture3",
  "picture4",
  // ...and so on...
};

Then when viewing the image

if (picture >= 0 && picture < pictures.Length) { // The 0 might be 1 in your case
    pictureInfo = pictures[picture];
}

or

IDictionary<int,string> pictures = new Dictionary<int,string>();
pictures.Add(1, "picture1");
// ...and so on...

Finding it looks very similar.

or

switch (picture) {
    case 1: pictureInfo = "picture1"; break;
    case 2: pictureInfo = "picture2"; break;
    // ...and so on...
}
+1


source


This is a long shot and I have assumptions that the filename of the images will always match the rotation value as shown below.

rotation = 1 -----> filename = image1.png
rotation = 2 -----> filename = image2.png

If so, you can do this

string fileName = "image" + rotation + ".png";

You can use this to select or display your file however you like.

+1


source


Switch statement.

http://www.dotnetperls.com/if-switch-performance

switch(number)
{
  case 1:

    break;
}

Or, if you have List<T>

- in this case T

- this is your image you can do

List<T> pictures = new List<T>();
T picture = pictures[rotation];
0


source


Better way would be to use int instead of String, then you can use switch case

.

Java 7 allows strings in switch statements, I don't know if this is possible in C #.

0


source






More articles:


All Articles