public JsonResult DrawLineChart() { // 预置颜色 List<Color> colors = new List<Color>() { Color.FromArgb(255,182,193), Color.FromArgb(238,130,238), Color.FromArgb(220,20,60), Color.FromArgb(153,50,204), Color.FromArgb(30,144,255), Color.FromArgb(60,179,113), Color.FromArgb(255,215,0), Color.FromArgb(255,140,0), Color.FromArgb(105,105,105) }; #region 允许配置项 //定义宽高 int height = 500, width = 700; //边缘位置留白 int margin_top = 20; int margin_right = 40; int margin_bottom = 60; int margin_left = 60; //辅助线距离顶部的距离 int xsubline = 20; //文字大小，单位：px int fontsize = 12; // 折线名称预留的位置 颜色框20，与文字间隙5，文字80，距离折线图10，需要包含边缘留白 int lineNameWidth = 120 - margin_right; #endregion #region 数据 //最大数量/总数量--生成y轴时，显示数字需要 int maxCount = 0; //x轴底部显示的名称 string[] bottomData = new string[] { "第一个", "第二个", "第三个", "第四个", "第五个" }; //折线名称 string[] lineName = new string[] { "折线1", "折线2" }; //折线数据 List<List<int>> lineData = new List<List<int>> { new List<int>(){ 12,23,15,44,32 }, new List<int>(){ 9,33,6,21,22 } }; //maxCount = xCount.Max(); for (int i = 0; i < lineData.Count; i++) { int tempMaxCount = lineData[i].Max(); if (tempMaxCount > maxCount) { maxCount = tempMaxCount; } } maxCount = maxCount == 0 ? 5 : maxCount; #endregion //单位转换对象 Spire.Pdf.Graphics.PdfUnitConvertor unitCvtr = new Spire.Pdf.Graphics.PdfUnitConvertor(); //生成图像对象 Bitmap image = new Bitmap(width + margin_left + margin_right + lineNameWidth, height + margin_top + margin_bottom); //创建画布 Graphics g = Graphics.FromImage(image); //消除锯齿 g.SmoothingMode = SmoothingMode.AntiAlias; //质量 g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.CompositingQuality = CompositingQuality.HighQuality; //黑色画笔--主轴颜色 Brush blackBrush = new SolidBrush(Color.FromArgb(255, 102, 102, 102)); Pen blackPen = new Pen(blackBrush, 1); //灰色画笔--辅助线条颜色 Brush grayBrush = new SolidBrush(Color.FromArgb(255, 224, 224, 224)); Pen grayPen = new Pen(grayBrush, 1); //填充区域内容 g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width + margin_left + margin_right + lineNameWidth, height + margin_top + margin_bottom); //y轴 g.DrawLine(blackPen, margin_left, margin_top, margin_left, (height + margin_top)); //x轴 g.DrawLine(blackPen, margin_left, (height + margin_top), (width + margin_left), (height + margin_top)); Font font = new Font("宋体", unitCvtr.ConvertUnits(fontsize, Spire.Pdf.Graphics.PdfGraphicsUnit.Pixel, Spire.Pdf.Graphics.PdfGraphicsUnit.Point)); //x轴--辅助线 //画5条辅助线，不管数字大小 int avgCount = Convert.ToInt32(Math.Ceiling(maxCount / 5.0)); // 为了适应后面的计算 maxCount = avgCount * 5; int lineHeight = (height - xsubline) / 5; //画辅助线与文字 for (int i = 0; i <= 5; i++) { //辅助线 if (i > 0) { g.DrawLine(grayPen, margin_left, (height + margin_top - lineHeight * i), (width + margin_left), (height + margin_top - lineHeight * i)); } //指向文字的线 g.DrawLine(blackPen, (margin_left - 5), (height + margin_top - lineHeight * i), margin_left, (height + margin_top - lineHeight * i)); //文字 int text = avgCount * i; RectangleF rec = new RectangleF(10, (height + margin_top - lineHeight * i - fontsize / 2), margin_left - 20, 20); StringFormat format = new StringFormat(StringFormatFlags.DirectionRightToLeft); g.DrawString(text.ToString(), font, blackBrush, rec, format); } //底部文字 int singleWidth = width / (bottomData.Length - 1); for (int i = 0; i < bottomData.Length; i++) { StringFormat format = new StringFormat(); format.Alignment = StringAlignment.Center; //居中 //x轴下的文字 //指向线 g.DrawLine(blackPen, margin_left + i * singleWidth, (height + margin_top), margin_left + i * singleWidth, (height + margin_top + 5)); //文字 RectangleF rec = new RectangleF(margin_left + (i * singleWidth) - singleWidth / 2, (height + margin_top + 15), singleWidth, (margin_bottom - 20)); g.DrawString(bottomData[i].ToString(), font, blackBrush, rec, format); } //预定颜色 for (int i = 0; i < lineName.Length; i++) { //随机颜色 Color tempColor = colors[i];//GetRandomColor(); //文字内容 StringFormat format = new StringFormat(StringFormatFlags.DirectionVertical); //format.Alignment = StringAlignment.Center; //居中 //画笔 SolidBrush brush = new SolidBrush(tempColor); Pen pen = new Pen(brush, 1); // 折线名称处理 // 颜色块 Rectangle rectangle = new Rectangle(margin_left + width + 10, margin_top + i * 25, 20, 20); g.FillRectangle(brush, rectangle); // 文字 RectangleF rec = new RectangleF(margin_left + width + 10 + 25, margin_top + i * 25, 80, 20); g.DrawString(bottomData[i].ToString(), font, blackBrush, rec, format); //这里要开始画折线了 Point[] points = new Point[lineData[i].Count]; for (int j = 0; j < lineData[i].Count; j++) { int x = j * singleWidth + margin_left; int y = height + margin_top - Convert.ToInt32(lineData[i][j] / Convert.ToDouble(maxCount) * (height - xsubline)); Point point = new Point(x,y); points[j] = point; } g.DrawLines(pen, points); } string relativePath = @"draw-image" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".jpg"; string path = Server.MapPath(relativePath); image.Save(path, System.Drawing.Imaging.ImageFormat.Jpeg); //return relativePath; return Json(relativePath, JsonRequestBehavior.AllowGet); }
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