C#+OpenCV基础(十四)_绘制像素、图形、文字

1、绘制直线

/// <summary>
/// 绘制直线
/// </summary>
/// <param name="mat">图片</param>
/// <param name="startPoint">线段的第一个点</param>
/// <param name="endPoint">线段的第二个点</param>
/// <param name="color">线条颜色</param>
/// <param name="thickness">线条宽度</param>
/// <param name="lineType">线条类型</param>
/// <param name="shift">偏移量</param>
/// <returns></returns>
public static Mat DrawLine(Mat mat, Point startPoint, Point endPoint, Scalar color,
    int thickness = 1, LineTypes lineType = LineTypes.Link8, int shift = 0)
{
    Cv2.Line(mat, startPoint, endPoint, color, thickness, lineType, shift);
    return mat;
}

2、绘制椭圆

/// <summary>
/// 绘制椭圆
/// </summary>
/// <param name="mat">图片</param>
/// <param name="center">圆点</param>
/// <param name="axes">半径长度；new Size(A1,A2)</param>
/// <param name="angle">椭圆偏移角度;>0顺时针,<0逆时针 </param>
/// <param name="startAngle">椭圆起始角度;>0 </param>
/// <param name="endAngle">椭圆终止角度;<360 </param>
/// <param name="color">椭圆线条颜色</param>
/// <param name="thickness">椭圆线条宽度；负数代表填充</param>
/// <param name="lineType">椭圆线条类型</param>
/// <param name="shift">偏移量</param>
/// <returns></returns>
public static Mat DrawEllipse(Mat mat, Point center, Size axes, double angle, double startAngle, double endAngle, Scalar color,
    int thickness = 1, LineTypes lineType = LineTypes.Link8, int shift = 0)
{
    Cv2.Ellipse(mat, center, axes, angle, startAngle, endAngle, color, thickness, lineType, shift);
    return mat;
}

3、绘制圆

/// <summary>
/// 绘制圆
/// </summary>
/// <param name="mat">图片</param>
/// <param name="center">圆心坐标</param>
/// <param name="radius">圆半径</param>
/// <param name="color">圆线条颜色</param>
/// <param name="thickness">圆线条宽度；负数代表填充</param>
/// <param name="lineType">圆线条类型</param>
/// <param name="shift">偏移量</param>
/// <returns></returns>
public static Mat DrawCircle(Mat mat, Point center, int radius, Scalar color,
    int thickness = 1, LineTypes lineType = LineTypes.Link8, int shift = 0)
{
    Cv2.Circle(mat, center, radius, color, thickness, lineType, shift);
    return mat;
}

4、绘制矩形

/// <summary>
/// 绘制矩形
/// </summary>
/// <param name="mat">图片</param>
/// <param name="pt1">顶点1</param>
/// <param name="pt2">顶点1相对应的顶点2</param>
/// <param name="color">矩形线条颜色</param>
/// <param name="thickness">矩形线条宽度；负数代表填充</param>
/// <param name="lineType">矩形线条类型</param>
/// <param name="shift">偏移量</param>
/// <returns></returns>
public static Mat DrawRectangle(Mat mat, Point pt1, Point pt2, Scalar color,
    int thickness = 1, LineTypes lineType = LineTypes.Link8, int shift = 0)
{
    Cv2.Rectangle(mat, pt1, pt2, color, thickness, lineType, shift);
    return mat;
}

5、绘制多边形

/// <summary>
/// 绘制多边形
/// </summary>
/// <param name="mat">图片</param>
/// <param name="pts">点位坐标</param>
/// <param name="isClosed">是否闭合线条</param>
/// <param name="color">多边形线条颜色</param>
/// <param name="thickness">多边形线条宽度；负数代表填充</param>
/// <param name="lineType">多边形线条类型</param>
/// <param name="shift">偏移量</param>
/// <returns></returns>
public static Mat DrawPolylines(Mat mat, IEnumerable<IEnumerable<Point>> pts, bool isClosed, Scalar color,
    int thickness = 1, LineTypes lineType = LineTypes.Link8, int shift = 0)
{
    //OpenCvSharp.Point[][] points = {
    //    new OpenCvSharp.Point[] { new OpenCvSharp.Point(50, 50), new OpenCvSharp.Point(50, 100), new OpenCvSharp.Point(100, 100) },
    //    new OpenCvSharp.Point[] { new OpenCvSharp.Point(200, 50), new OpenCvSharp.Point(250, 50), new OpenCvSharp.Point(250, 150), new OpenCvSharp.Point(200, 150) }
    //};
    Cv2.Polylines(mat, pts, isClosed, color, thickness, lineType, shift);
    return mat;
}

6、绘制文本-不支持中文

/// <summary>
/// 绘制文本-不支持中文
/// </summary>
/// <param name="mat">图片</param>
/// <param name="text">文字</param>
/// <param name="org">文本左上角的起始坐标</param>
/// <param name="fontFace">字体大小</param>
/// <param name="fontScale">字体缩放</param>
/// <param name="color">字体颜色</param>
/// <param name="thickness">字体线条宽度</param>
/// <param name="lineType">字体线条类型</param>
/// <param name="bottomLeftOrigin">是否左下对齐</param>
/// <returns></returns>
public static Mat DrawText(Mat mat, string text, Point org, HersheyFonts fontFace, double fontScale, Scalar color,
    int thickness = 1, LineTypes lineType = LineTypes.Link8, bool bottomLeftOrigin = false)
{
    Cv2.PutText(mat, text, org, fontFace, fontScale, color, thickness, lineType, bottomLeftOrigin);
    return mat;
}

7、绘制文本-支持中文

/// <summary>
/// 绘制文本-支持中文
/// </summary>
/// <param name="bitmap">图片</param>
/// <param name="text">文字内容</param>
/// <param name="font">字体信息;new Font("宋体", 8)</param>
/// <param name="smoothingMode">字体平滑模式;SmoothingMode.AntiAlias</param>
/// <param name="org">位置;new System.Drawing.Point(10, 560)</param>
/// <param name="brush">字体颜色;System.Drawing.Brushes.White</param>
/// <returns></returns>
public static Bitmap DrawText_Utf8(Bitmap bitmap, string text, System.Drawing.Font font, SmoothingMode smoothingMode,
    System.Drawing.Point org, System.Drawing.Brush brush)
{
    using (var graphics = Graphics.FromImage(bitmap))
    {
        graphics.SmoothingMode = smoothingMode;
        graphics.DrawString(text, font, brush, org);
    }
    return bitmap;
}