snuvi-engine/src/me/hammerle/snuviengine/game/Chat.java

package me.hammerle.snuviengine.game;

import me.hammerle.snuviengine.api.FontRenderer;
import me.hammerle.snuviengine.api.Shader;

public class Chat
{
    private final char[] input = new char[256];
    private final StringBuilder[] chat = new StringBuilder[25];
    private int startIndex = 0;
    private int writeIndex = 0;
    private int viewIndex = 0;
    private int viewLenght = 5;
    private final int lineLenght = 20;
    
    public Chat()
    {
        for(int i = 0; i < chat.length; i++)
        {
            chat[i] = new StringBuilder();
        }
        
        for(int i = 0; i < 30; i++)
        {
            addString(String.valueOf(i).toCharArray());
        }
    }
    
    private void nextWriteIndex()
    {
        writeIndex = (writeIndex + 1) % chat.length;
        chat[writeIndex].delete(0, chat[writeIndex].length());
        if(writeIndex == startIndex)
        {
            startIndex = (startIndex + 1) % chat.length;
        }
        
        int distance;
        if(viewIndex < writeIndex)
        {
            distance = writeIndex - viewIndex;
        }
        else
        {
            distance = chat.length - viewIndex + writeIndex;
        }
        
        if(distance - 1 == viewLenght)
        {
            viewIndex = (viewIndex + 1) % chat.length;
        }
    }
    
    private void addString(char[] text)
    {
        int pos = 0;
        for(int i = 0; i < text.length; i++)
        {
            int j = i;
            int w = 0;
            OUTER: while(j < text.length)
            {
                switch(text[j])
                {
                    case ' ':
                        break OUTER;
                    case FontRenderer.COLOR_CHAR:
                        j++;
                        if(j < text.length)
                        {
                            j++;
                        }   
                        break;
                    default:
                        w++;
                        j++;
                        break;
                }
            }
            
            pos += w;
            if(pos > lineLenght)
            {
                pos = w;
                nextWriteIndex();
            }
            
            while(i < j)
            {
                chat[writeIndex].append(text[i]);
                i++;
            }
            pos++;
            chat[writeIndex].append(' ');
        }
        nextWriteIndex();
    }
    
    public void tick()
    {
        if(((Game.DOWN.getTime() + 15) & 0x7) == 0)
        {
            if((viewIndex + viewLenght) % chat.length != writeIndex)
            {
                viewIndex = (viewIndex + 1) % chat.length;
            }
        }
        
        if(((Game.UP.getTime() + 15) & 0x7) == 0)
        {
            if(viewIndex != startIndex)
            {
                viewIndex--;
                if(viewIndex < 0)
                {
                    viewIndex += chat.length;
                }
            }
        }
    }
    
    public void renderTick()
    {
        Shader.setTextureEnabled(true);
        Shader.setColorEnabled(true);
        float x = 0.0f;
        float y = 0.0f;
        
        FontRenderer fr = Shader.getFontRenderer();
        
        int i = viewIndex;
        int end = (viewIndex + viewLenght) % chat.length;
        while(i != end)
        {
            y = fr.drawString(x, y, true, chat[i].toString());
            i = (i + 1) % chat.length;
        }
    }
}