C#利用Graphics来绘图

 

之前都是用的一个Chart控件来显示走势图，现在这种方法是使用Graphics来绘制。

 

 

 

private void button1_Click(object sender, EventArgs e)
        {
            int height = 400, width = 600;
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(height, width);
            Graphics g = Graphics.FromImage(image);//创建一个对象

            Font font = new System.Drawing.Font("Arial", 9, FontStyle.Regular);           
            g.Clear(Color.White);

            System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.Blue, 1.2f, true);
            g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width, height);           

            Brush brush1 = new SolidBrush(Color.Blue);

            g.DrawRectangle(new Pen(Color.Blue), 0, 0, image.Width - 4, image.Height - 4);
            Pen mypen = new Pen(brush, 1);

            int x = 100;
            for (int i = 0; i < 11; i++)
            {
                g.DrawLine(mypen, x, 80, x, 340);
                x = x + 40;
            }
            Pen mypen1 = new Pen(Color.Blue, 2);
            g.DrawLine(mypen1, x - 480, 80, x - 480, 340);
           
            int y = 106;
            for (int i = 0; i < 9; i++)
            {
                g.DrawLine(mypen, 60, y, 540, y);
                y = y + 26;
            }
            g.DrawLine(mypen1, 60, y, 540, y);

            //x
            String[] month = {"  一月", "  二月", "  三月", "  四月", "  五月", "  六月", "  七月",
                     "  八月", "  九月", "  十月", "十一月", "十二月"};
            x = 62;
            for (int i = 0; i < 12; i++)
            {
                g.DrawString(month[i].ToString(), font, Brushes.Green, x, 348); 
                x = x + 40;
            }

            //y
            String[] m = {"100%", " 90%", " 80%", " 70%", " 60%", " 50%", " 40%", " 30%",
                     " 20%", " 10%", "  0%"};
            y = 85;
            for (int i = 0; i < 11; i++)
            {
                g.DrawString(m[i].ToString(), font, Brushes.Green, 25, y); 
                y = y + 26;
            }

            //实际的数据可以从数据库读取出来保存在一个数组里面即可。
            int[] Count = new int[12];

            Count[0] = 50;
            Count[1] = 100;
            Count[2] = 200;
            Count[3] = 120;
            Count[4] = 90;
            Count[5] = 400;
            Count[6] = 160;
            Count[7] = 420;
            Count[8] = 300;
            Count[9] = 280;
            Count[10] = 350;
            Count[11] = 15;

            x = 70;
            for (int i = 0; i < 12; i++)
            {
                SolidBrush mybrush = new SolidBrush(Color.Red);
                g.FillRectangle(mybrush, x, 339 - Count[i] * 5 / 10, 20, Count[i] * 5 / 10);
                x = x + 40;
            }

            //将图片设置为Panel的背景颜色，然后呈现出来。
            this.panel1.BackgroundImage = image;
        }