WinForm画图

/// <summary>
        /// 生成图片
        /// </summary>
        /// <param name="imgWidth">图片的宽</param>
        /// <param name="imgHeight">图片的高</param>
        /// <param name="leftPercent">左图占百分比</param>
        /// <param name="rightPercent">右图占百分比</param>
        /// <param name="percent">图片文本</param>
        /// <returns></returns>
        private Image DrawMultyProcessBar(int imgWidth, int imgHeight, float leftPercent, float rightPercent, float percent)
        {
            if (imgWidth <= 0 || imgHeight <= 0)
                throw new Exception("参数imgWidth必须大于0，参数imgHeight必须大于0");

            if(leftPercent>1 || rightPercent>1)
                throw new Exception("参数leftPercent必须小于1，参数rightPercent必须小于1");

            if (leftPercent + rightPercent != 1.0)
                throw new Exception("参数leftPercent+rightPercent必须等于1");

            string str = percent.ToString() + "%";
            Bitmap bmp = new Bitmap(imgWidth, imgHeight);
            Graphics grp = Graphics.FromImage(bmp);

            grp.FillRectangle(SystemBrushes.HotTrack, new Rectangle(0, 0, (int)(leftPercent * imgWidth), imgHeight));
            grp.FillRectangle(SystemBrushes.Highlight, new Rectangle((int)(leftPercent * imgWidth), 0, (int)(rightPercent * imgWidth), imgHeight));

            PointF point = new PointF(bmp.Width / 2 - str.Length * 9 / 2, bmp.Height / 2 - 9 / 2);
            grp.DrawString(str, new Font(new FontFamily("宋体"), 9), Brushes.White, point);
            grp.Dispose();

            return bmp;
        }

pictureBox1.Image = DrawMultyProcessBar(pictureBox1.Width, pictureBox1.Height, 0.5f, 0.5f, 50.0f);