CODEWITHSUNDEEP
c#unity-game-engine
armnotstrong
armnotstrong

Reputation: 9065

unity using image to desplace score

We want the score displayed in our game to be a specifically designed number font. We got the numbers in the format of png from 0~9 and I think it will be neat to put those in a Texture[] array and display it accordingly.

Following is the desplay controller script

public class StepDespController : MonoBehaviour {

    public static StepDespController instance;
    private int step = 0;

    [SerializeField]
    public Texture[] numberTextures;

    private void Awake()
    {
        if(instance == null)
        {
            instance = this;
        }
    }

    public void addStep(int step)
    {
        this.step += step;
    }

    private void OnGUI()
    {
        char[] array = step.ToString().ToCharArray();
        Debug.Log(array);
        for (int i = 0; i < array.Length; i++)
        {
            GUI.DrawTexture(new Rect(0 + i * 30, 0, 20, 30), numberTextures[(int)char.GetNumericValue(array[i])]);
        }
    }
}

And following is the binding of the textures of the digitals from 0~9:

enter image description here

But I found it will not display anything in the game scene, what was I missing?

Thanks.

Upvotes: 0

Views: 140

Answers (1)

mrogal.ski
mrogal.ski

Reputation: 5930

Here is your problem : 

char[] array = step.ToString().ToCharArray();
Debug.Log(array);
for (int i = 0; i < array.Length; i++)
{
    GUI.DrawTexture(new Rect(0 + i * 30, 0, 20, 30), numberTextures[(int)char.GetNumericValue(array[i])]);
}

Instead of doing it that way I would suggest you to simply use this :

const int offset_step = 30; // declare standard step size
int offsetX = 0; // declare starting x offset
foreach(char c in step.ToString()) // iterate through all characters in your score value as string value
{
    // draw texture on index `char - (char)'0'`
    GUI.DrawTexture(new Rect(offsetX, 0, 20, 30), numberTextures[(int)(c - 0x30)]);
    offsetX += 30; // increase offset
}

To extend this answer a bit. char is 2 bytes wide numeric representation of character ( either printable or not ). Since you want to display only numeric values you have to remember that these values starts from 0 which is 0x30 and ends up with 9 which is 0x39 in ASCII and same within CP1251 which is used by C#. Now all you have to do, because your 0 texture is the "0th" element in your array, is to subtract beginning of the ASCII numeric characters from your character.

Simple example :

char zero = '0'; // 0x30
char one = '1'; // 0x31
// when you do `one == 1`
// it translates to  `0x31 == 0x01` which is false
// now consider this `one - zero == 1` 
// above will return true because 
// 0x31 - 0x30 == 0x01
// 0x01 == 0x01

Upvotes: 1

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