using System.Drawing;
using System.Drawing.Drawing2D;

namespace MaterialSkin
{
    static class DrawHelper
    {
        public static GraphicsPath CreateRoundRect(float x, float y, float width, float height, float radius)
        {
            var gp = new GraphicsPath();
            gp.AddLine(x + radius, y, x + width - (radius * 2), y);
            gp.AddArc(x + width - (radius * 2), y, radius * 2, radius * 2, 270, 90);
            gp.AddLine(x + width, y + radius, x + width, y + height - (radius * 2));
            gp.AddArc(x + width - (radius * 2), y + height - (radius * 2), radius * 2, radius * 2, 0, 90);
            gp.AddLine(x + width - (radius * 2), y + height, x + radius, y + height);
            gp.AddArc(x, y + height - (radius * 2), radius * 2, radius * 2, 90, 90);
            gp.AddLine(x, y + height - (radius * 2), x, y + radius);
            gp.AddArc(x, y, radius * 2, radius * 2, 180, 90);
            gp.CloseFigure();
            return gp;
        }

        public static GraphicsPath CreateRoundRect(Rectangle rect, float radius)
        {
            return CreateRoundRect(rect.X, rect.Y, rect.Width, rect.Height, radius);
        }

        public static Color BlendColor(Color backgroundColor, Color frontColor, double blend)
        {
            var ratio = blend / 255d;
            var invRatio = 1d - ratio;
            var r = (int)((backgroundColor.R * invRatio) + (frontColor.R * ratio));
            var g = (int)((backgroundColor.G * invRatio) + (frontColor.G * ratio));
            var b = (int)((backgroundColor.B * invRatio) + (frontColor.B * ratio));
            return Color.FromArgb(r, g, b);
        }

        public static Color BlendColor(Color backgroundColor, Color frontColor)
        {
            return BlendColor(backgroundColor, frontColor, frontColor.A);
        }
    }
}