C#图片处理之:在图片上画框（圈）

C#图片处理之:在图片上画框（圈）

 

 

有时候给别人演示图片，例如培训某个软件使用的时候，往往需要在画面上画个框或者圈，提醒用户注意这是个重点。其实这个功能并不难，只需要知道Pen对象的用法就可以了。我们对框或者圈样式的控制都可以通过对Pen的控制来实现。

        /**//// <summary>
        /// 在图片上画框
        /// </summary>
        /// <param name="bmp">原始图</param>
        /// <param name="p0">起始点</param>
        /// <param name="p1">终止点</param>
        /// <param name="RectColor">矩形框颜色</param>
        /// <param name="LineWidth">矩形框边界</param>
        /// <returns></returns>
        public static Bitmap DrawRectangleInPicture(Bitmap bmp, Point p0, Point p1, Color RectColor, int LineWidth,DashStyle ds)
        ...{
            if (bmp == null) return null;
                    

            Graphics g = Graphics.FromImage(bmp);

            Brush brush = new SolidBrush(RectColor);
            Pen pen = new Pen(brush, LineWidth);
            pen.DashStyle = ds;

            g.DrawRectangle(pen, new Rectangle(p0.X, p0.Y, Math.Abs(p0.X - p1.X), Math.Abs(p0.Y - p1.Y)));

            g.Dispose();

            return bmp;
        }

        /**//// <summary>
        /// 在图片上画椭圆
        /// </summary>
        /// <param name="bmp"></param>
        /// <param name="p0"></param>
        /// <param name="RectColor"></param>
        /// <param name="LineWidth"></param>
        /// <param name="ds"></param>
        /// <returns></returns>
        public static Bitmap DrawRoundInPicture(Bitmap bmp, Point p0, Point p1, Color RectColor, int LineWidth, DashStyle ds)
        ...{
            if (bmp == null) return null;

            Graphics g = Graphics.FromImage(bmp);

            Brush brush = new SolidBrush(RectColor);
            Pen pen = new Pen(brush, LineWidth);
            pen.DashStyle = ds;

            g.DrawEllipse(pen, new Rectangle(p0.X, p0.Y, Math.Abs(p0.X - p1.X), Math.Abs(p0.Y - p1.Y)));

            g.Dispose();

            return bmp;
        }

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