C# Graphics 画圆角矩形

1. 画矩形边

public static void DrawRoundRectangle(this Graphics graphics, Pen pen, RectangleF rectangle, float radiusX, float radiusY = 0)
{
    if (radiusY == 0)
    {
        radiusY = radiusX;
    }

    var mode = graphics.SmoothingMode;
    graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

    #region 方法1
    //float[] itXs = new float[3] { rectangle.X + radiusX, rectangle.X + rectangle.Width - 1 - radiusX, rectangle.X + rectangle.Width - 1 };
    //float[] itYs = new float[3] { rectangle.Y + radiusY, rectangle.Y + rectangle.Height - 1 - radiusY, rectangle.Y + rectangle.Height - 1 };
    ////上
    //graphics.DrawLine(pen, itXs[0], rectangle.Y, itXs[1], rectangle.Y);
    ////下
    //graphics.DrawLine(pen, itXs[0], itYs[2], itXs[1], itYs[2]);
    ////左
    //graphics.DrawLine(pen, rectangle.X, itYs[0], rectangle.X, itYs[1]);
    ////右
    //graphics.DrawLine(pen, itXs[2], itYs[0], itXs[2], itYs[1]);


    ////左上角
    //graphics.DrawArc(pen, rectangle.X, rectangle.Y, 2 * radiusX, 2 * radiusY, 180, 90);
    ////右上角
    //graphics.DrawArc(pen, itXs[1] - radiusX, rectangle.Y, 2 * radiusX, 2 * radiusY, 270, 90);
    ////左下角
    //graphics.DrawArc(pen, rectangle.X, itYs[1] - radiusY, 2 * radiusX, 2 * radiusY, 90, 90);
    ////右下角
    //graphics.DrawArc(pen, itXs[1] - radiusX, itYs[1] - radiusY, 2 * radiusX, 2 * radiusY, 0, 90);

    #endregion


    #region 方法2

    GraphicsPath GraphicsPath1 = new GraphicsPath();

    //x 坐标
    float[] itXs = new float[3]
    {
        rectangle.X + radiusX, 
        rectangle.X + rectangle.Width - 1 - radiusX,
        rectangle.X + rectangle.Width - 1
    };
    //y 坐标
    float[] itYs = new float[3] 
    { 
        rectangle.Y + radiusY,
        rectangle.Y + rectangle.Height - 1 - radiusY,
        rectangle.Y + rectangle.Height - 1
    };

    //左边
    GraphicsPath1.AddLine(rectangle.X, itYs[1], rectangle.X, itYs[0]);
    //左上角
    GraphicsPath1.AddArc(rectangle.X, rectangle.Y, 2 * radiusX, 2 * radiusY, 180, 90);

    //上边
    GraphicsPath1.AddLine(itXs[0], rectangle.Y, itXs[1], rectangle.Y);
    //右上角
    GraphicsPath1.AddArc(itXs[1] - radiusX, rectangle.Y, 2 * radiusX, 2 * radiusY, -90, 90);

    //右边
    GraphicsPath1.AddLine(itXs[2], itYs[0], itXs[2], itYs[1]);
    //右下角
    GraphicsPath1.AddArc(itXs[1] - radiusX, itYs[1] - radiusY, 2 * radiusX, 2 * radiusY, 0, 90);

    //下边
    GraphicsPath1.AddLine(itXs[1], itYs[2], itXs[0], itYs[2]);
    //左下角
    GraphicsPath1.AddArc(rectangle.X, itYs[1] - radiusY, 2 * radiusX, 2 * radiusY, 90, 90);

    graphics.DrawPath(pen, GraphicsPath1);

    #endregion

    graphics.SmoothingMode = mode;
}

 

 

2. 填充圆角矩形

public static void FillRoundRectangle(this Graphics graphics, Brush brush, RectangleF rectangle, float radiusX, float radiusY = 0)
{
    if (radiusY == 0)
    {
        radiusY = radiusX;
    }

    var mode = graphics.SmoothingMode;
    graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

    GraphicsPath GraphicsPath1 = new GraphicsPath();


    //x 坐标
    float[] itXs = new float[3]
    {
        rectangle.X + radiusX, 
        rectangle.X + rectangle.Width - 1 - radiusX,
        rectangle.X + rectangle.Width - 1
    };
    //y 坐标
    float[] itYs = new float[3] 
    { 
        rectangle.Y + radiusY,
        rectangle.Y + rectangle.Height - 1 - radiusY,
        rectangle.Y + rectangle.Height - 1
    };

    //左边
    GraphicsPath1.AddLine(rectangle.X, itYs[1], rectangle.X, itYs[0]);
    //左上角
    GraphicsPath1.AddArc(rectangle.X, rectangle.Y, 2 * radiusX, 2 * radiusY, 180, 90);

    //上边
    GraphicsPath1.AddLine(itXs[0], rectangle.Y, itXs[1], rectangle.Y);
    //右上角
    GraphicsPath1.AddArc(itXs[1] - radiusX, rectangle.Y, 2 * radiusX, 2 * radiusY, -90, 90);

    //右边
    GraphicsPath1.AddLine(itXs[2], itYs[0], itXs[2], itYs[1]);
    //右下角
    GraphicsPath1.AddArc(itXs[1] - radiusX, itYs[1] - radiusY, 2 * radiusX, 2 * radiusY, 0, 90);

    //下边
    GraphicsPath1.AddLine(itXs[1], itYs[2], itXs[0], itYs[2]);
    //左下角
    GraphicsPath1.AddArc(rectangle.X, itYs[1] - radiusY, 2 * radiusX, 2 * radiusY, 90, 90);

    graphics.FillPath(brush, GraphicsPath1);
    graphics.SmoothingMode = mode;
}