using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace BiskLog_Point_Of_Sale.Classes
{
    class GradientCurve : Panel
    {
        Color TopColor;
        Color BottomColor;
        int wh = 20;
        public int BorderRadius { get { return wh; } set { wh = value; Invalidate(); } }
        public Color ColorTopColor
        {
            get { return TopColor; }

            set
            {
                TopColor = value;
                Invalidate();
            }
        }
        public Color ColorBottomColor
        {
            get { return BottomColor; }

            set
            {
                BottomColor = value;
                Invalidate();
            }
        }
        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
        private static extern IntPtr CreateRoundRectRgn
        (
            int nLeftRect,     // x-coordinate of upper-left corner
            int nTopColorRect,      // y-coordinate of upper-left corner
            int nRightRect,    // x-coordinate of lower-right corner
            int nBottomColorRect,   // y-coordinate of lower-right corner
            int nWidthEllipse, // height of ellipse
            int nHeightEllipse // width of ellipse
        );
        public GradientCurve()
        {
            DoubleBuffered = true;
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics graphics = e.Graphics;
            graphics.SmoothingMode = SmoothingMode.HighQuality;
            GraphicsPath graphicsPath = new GraphicsPath();
            graphicsPath.AddArc(new Rectangle(0, 0, wh, wh), 180, 90);
            graphicsPath.AddArc(new Rectangle(Width - wh, 0, wh, wh), -90, 90);
            graphicsPath.AddArc(new Rectangle(Width - wh, Height - wh, wh, wh), 0, 90);
            graphicsPath.AddArc(new Rectangle(0, Height - wh, wh, wh), 90, 90);
            e.Graphics.FillPath(new LinearGradientBrush(this.ClientRectangle, this.ColorTopColor,this.ColorBottomColor, 90F), graphicsPath);
            base.OnPaint(e);
        }
    }
}