Terminal.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Aiv.Fast2D;
using OpenTK;

namespace Fast2DApp
{
    class Terminal
    {
        char[] characters;
        int cols;
        int rows;

        int cursorX;
        int cursorY;

        Texture fonts;
        Sprite tile;
        Vector4 color;

        public Terminal(int cols, int rows)
        {
            this.cols = cols;
            this.rows = rows;
            this.characters = new char[this.cols * this.rows];
            this.cursorX = 0;
            this.cursorY = 0;
            this.fonts = new Texture("Assets/text.png");
            this.tile = new Sprite(50, 50);
            this.color = new Vector4(1, 0, 1, 0);
        }

        public void Put(char character)
        {
            character = char.ToLower(character);
            int index = cursorY * this.cols + cursorX;
            if (character == ' ')
            {
                characters[index] = '\0';
            }
            else if (character == '\n')
            {
                if (cursorY < this.rows - 1)
                {
                    cursorY++;
                }
                return;
            }
            else if (character == '\r')
            {
                cursorX = 0;
                return;
            }
            else
            {
                characters[index] = character;
            }
            if (cursorX < this.cols - 1)
                cursorX++;
        }

        public void Put(string message)
        {
            foreach(char character in message)
            {
                Put(character);
            }
        }

        public void Draw()
        {
            for (int y = 0; y < this.rows; y++)
            {
                for (int x = 0; x < this.cols; x++)
                {
                    int index = y * this.cols + x;
                    int currentCharacterIndex = (int)this.characters[index];
                    // fix the character index for the texture
                    currentCharacterIndex -= 97;
                    // is it a valid character ?
                    if (currentCharacterIndex < 26)
                    {
                        // compute the UV (in pixel space)
                        int gridX = currentCharacterIndex % 6;
                        int gridY = currentCharacterIndex / 6;
                        int textureX = gridX * 100;
                        int textureY = gridY * 100;
                        tile.SetAdditiveTint(color);
                        tile.position = new Vector2(x * tile.Width, y * tile.Height);
                        tile.DrawTexture(this.fonts, textureX, textureY, 100, 100);
                    }
                }
            }
        }
    }
}