[求助]C# 折线图的代码 求高手

Question

 Bitmap bmap = new Bitmap(500, 500);
            Graphics gph = Graphics.FromImage(bmap);
            gph.Clear(Color.White);            PointF cpt = new PointF(40, 420);//中心点
            PointF[] xpt = new PointF[3]{new PointF(cpt.Y+15,cpt.Y),
                 new PointF(cpt.Y,cpt.Y-8),new PointF(cpt.Y,cpt.Y+8)};//x轴三角形
            PointF[] ypt = new PointF[3]{new PointF(cpt.X,cpt.X-15),
                 new PointF(cpt.X-8,cpt.X),new PointF(cpt.X+8,cpt.X)};//y轴三角形
            gph.DrawString("支出情况折线图", new Font("宋体", 14),
                 Brushes.Black, new PointF(cpt.X + 60, cpt.X));//图表标题
            //画x轴
            gph.DrawLine(Pens.Black, cpt.X, cpt.Y, cpt.Y, cpt.Y);
            gph.DrawPolygon(Pens.Black, xpt);
            gph.FillPolygon(new SolidBrush(Color.Black), xpt);
            gph.DrawString("类型", new Font("宋体", 12), Brushes.Black,
                new PointF(cpt.Y + 10, cpt.Y + 10));
            //画y轴
            gph.DrawLine(Pens.Black, cpt.X, cpt.Y, cpt.X, cpt.X);
            gph.DrawPolygon(Pens.Black, ypt);
            gph.FillPolygon(new SolidBrush(Color.Black), ypt);
            gph.DrawString("单位(百分比)", new Font("宋体", 12),
               Brushes.Black, new PointF(0, 7));
            for (int i = 1; i <= 8; i++)
            {
                //画y轴刻度
                if (i < 11)
                {
                    gph.DrawString((i * 10).ToString(), new Font("宋体", 11),
                          Brushes.Black, new PointF(cpt.X - 30, cpt.Y - i * 30 - 6));
                    gph.DrawLine(Pens.Black, cpt.X - 3, cpt.Y - i * 30,
                          cpt.X, cpt.Y - i * 30);
                }                //画x轴项目
                gph.DrawString(PayInfo[i - 1].Substring(0, 1), new Font("宋体", 11),
                    Brushes.Black, new PointF(cpt.X + i * 30 - 5, cpt.Y + 5));
                gph.DrawString(PayInfo[i - 1].Substring(1, 1), new Font("宋体", 11),
                    Brushes.Black, new PointF(cpt.X + i * 30 - 5, cpt.Y + 20));
                if (PayInfo[i - 1].Length > 2)
                    gph.DrawString(PayInfo[i - 1].Substring(2, 1),
                          new Font("宋体", 11), Brushes.Black,
                          new PointF(cpt.X + i * 30 - 5, cpt.Y + 35));
                //画点
                gph.DrawEllipse(Pens.Black, cpt.X + i * 30 - 1.5f, cpt.Y - d[i - 1] * 3 - 1.5f, 3, 3);
                gph.FillEllipse(new SolidBrush(Color.Black), cpt.X + i * 30 - 1.5f,
                    cpt.Y - d[i - 1] * 3 - 1.5f, 3, 3);
                //画数值
                gph.DrawString(d[i - 1].ToString(), new Font("宋体", 11),
                      Brushes.Black, new PointF(cpt.X + i * 30, cpt.Y - d[i - 1] * 3));
                //画折线
                if (i > 1) gph.DrawLine(Pens.Red, cpt.X + (i - 1) * 30, cpt.Y - d[i - 2] * 3,
                        cpt.X + i * 30, cpt.Y - d[i - 1] * 3);
            }
            for (int j = 1; j <= 10; j++)
            {
                if (j < 11)
                {
                    gph.DrawString((j * 10).ToString(), new Font("宋体", 11),
                          Brushes.Black, new PointF(cpt.X - 30, cpt.Y - j * 30 - 6));
                    gph.DrawLine(Pens.Black, cpt.X - 3, cpt.Y - j * 30,
                          cpt.X, cpt.Y - j * 30);
                }
            }
//这里的 中心点  Y轴三角形 X轴三角形 是什么东西啊

Answer 1

没有用GDI做过，用XtraChart实现挺简单的。

Answer 2

 能不能帮我解释这句话的意思啊 明天就答辩了 现在还没搞懂啊  就这句 PointF cpt = new PointF(40, 420);//中心点
            PointF[] xpt = new PointF[3]{new PointF(cpt.Y+15,cpt.Y),
                 new PointF(cpt.Y,cpt.Y-8),new PointF(cpt.Y,cpt.Y+8)};//x轴三角形