using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GrapgicalEditor
{
    public partial class Form1 : Form
    {
        Color CurrentColor = Color.Black;
        bool isPressed = false;
        Point CurrentPoint;
        Point PrevPoint;
        Graphics g;
        int x, y, lx, ly = 0;
        Item curItem;

        public Form1()
        {
            InitializeComponent();

            //g = panel1.CreateGraphics();
            textBox1.BackColor = Color.Black;
        }

        public enum Item {
            Rectangle, Ellipse, Pencil, Brush, Line
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.ReadOnly = true;
        }

        private void paint() {
            //Pen p = new Pen(CurrentColor, (float)numericUpDown1.Value);
            //g.DrawLine(p, PrevPoint, CurrentPoint);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() == DialogResult.OK){
                CurrentColor = colorDialog1.Color;
                textBox1.BackColor = colorDialog1.Color;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            panel1.Refresh();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            curItem = Item.Line;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            curItem = Item.Rectangle;
        }

        private void MouseDown(object sender, MouseEventArgs e) {
            isPressed = true;
            CurrentPoint = e.Location;
            x = e.X;
            y = e.Y;
        }

        private void MouseMove(object sender, MouseEventArgs e) {

            if (isPressed) {
                Graphics graph = panel1.CreateGraphics();
                switch (curItem)
                {
                    case Item.Rectangle:
                        graph.FillRectangle(new SolidBrush(CurrentColor), x, y, e.X - x, e.Y - y);
                        break;
                }
                graph.Dispose();
            }
        }

        private void MouseUp(object sender, MouseEventArgs e) {
            isPressed = false;
            lx = e.X;
            ly = e.Y;
            if (curItem == Item.Line) {
                Graphics graph = panel1.CreateGraphics();
                graph.DrawLine(new Pen(new SolidBrush(CurrentColor), (float)numericUpDown1.Value), new Point(x, y), new Point(lx, ly));
                graph.Dispose();
            }
        }
    }
}